一、搭建开发环境
1.1、使用Maven创建Web项目
执行如下命令:
如下图所示:
创建好的项目如下:
编辑pom.xml文件
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
|
<project xmlns= "http://maven.apache.org/POM/.." xmlns:xsi= "http://www.w.org//XMLSchema-instance" xsi:schemaLocation= "http://maven.apache.org/POM/.. http://maven.apache.org/maven-v__.xsd" > <modelVersion>..</modelVersion> <groupId>me.gacl</groupId> <artifactId>spring-mybatis</artifactId> <packaging>war</packaging> <version>.-SNAPSHOT</version> <name>spring-mybatis Maven Webapp</name> <url>http: //maven.apache.org</url> <dependencies> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>..</version> <scope>test</scope> </dependency> </dependencies> <build> <finalName>spring-mybatis</finalName> </build> </project> |
修改<name>spring4-mybatis3 Maven Webapp</name>部分,把"Maven Webapp"这部分包含空格的内容去掉,否则Maven在编译项目时会因为空格的原因导致一些莫名其妙的错误出现,修改成:<name>spring4-mybatis3</name>。
另外,把以下内容删掉:
1
2
3
4
5
6
|
<dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>..</version> <scope>test</scope> </dependency> |
这部分是junit的jar包依赖信息,这个版本太低了,我们不使用这个Junit测试版本,修改过后的pom.xml内容如下:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
|
<project xmlns= "http://maven.apache.org/POM/.." xmlns:xsi= "http://www.w.org//XMLSchema-instance" xsi:schemaLocation= "http://maven.apache.org/POM/.. http://maven.apache.org/maven-v__.xsd" > <modelVersion>..</modelVersion> <groupId>me.gacl</groupId> <artifactId>spring-mybatis</artifactId> <packaging>war</packaging> <version>.-SNAPSHOT</version> <name>spring-mybatis</name> <url>http: //maven.apache.org</url> <dependencies> </dependencies> <build> <finalName>spring-mybatis</finalName> </build> </project> |
1.2、将创建好的项目导入MyEclipse中
具体操作步骤如下图所示:
手动创建【src/main/java】、【src/test/resources】、【src/test/java】这三个source folder,如下图所示:
到此,项目搭建的工作就算是全部完成了。
二、创建数据库和表(针对MySQL)
SQL脚本如下:
1
2
3
4
5
6
7
8
9
10
|
Create DATABASE spring4_mybatis3; USE spring4_mybatis3; DROP TABLE IF EXISTS t_user; CREATE TABLE t_user ( user_id char (32) NOT NULL , user_name varchar (30) DEFAULT NULL , user_birthday date DEFAULT NULL , user_salary double DEFAULT NULL , PRIMARY KEY (user_id) ) ENGINE=InnoDB DEFAULT CHARSET=utf8; |
创建好的数据库和表如下:
三、使用generator工具生成代码
在网上找到了一个generator工具可以根据创建好的数据库表生成MyBatis的表对应的实体类,SQL映射文件和dao,找到generator工具根目录下的generator.xml文件,这个文件是用来配置代码生成规则的,如下图所示:
编辑generator.xml文件,内容如下:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
|
<?xml version= "." encoding= "UTF-" ?> <!DOCTYPE generatorConfiguration PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration .//EN" "http://mybatis.org/dtd/mybatis-generator-config__.dtd" > <generatorConfiguration> <!-- 数据库驱动包位置 --> <classPathEntry location= "E:\repository\mysql\mysql-connector-java\..\mysql-connector-java-...jar" /> <!-- <classPathEntry location= "C:\oracle\product\..\db_\jdbc\lib\ojdbc.jar" />--> <context id= "DBTables" targetRuntime= "MyBatis" > <commentGenerator> <property name= "suppressAllComments" value= "true" /> </commentGenerator> <!-- 数据库链接URL、用户名、密码 --> <jdbcConnection driverClass= "com.mysql.jdbc.Driver" connectionURL= "jdbc:mysql://localhost:/spring_mybatis" userId= "root" password= "XDP" > <!--<jdbcConnection driverClass= "oracle.jdbc.driver.OracleDriver" connectionURL= "jdbc:oracle:thin:@localhost::orcl" userId= "msa" password= "msa" >--> </jdbcConnection> <javaTypeResolver> <property name= "forceBigDecimals" value= "false" /> </javaTypeResolver> <!-- 生成实体类的包名和位置,这里配置将生成的实体类放在me.gacl.domain这个包下 --> <javaModelGenerator targetPackage= "me.gacl.domain" targetProject= "C:\Users\gacl\spring-mybatis\src\main\java" > <property name= "enableSubPackages" value= "true" /> <property name= "trimStrings" value= "true" /> </javaModelGenerator> <!-- 生成的SQL映射文件包名和位置,这里配置将生成的SQL映射文件放在me.gacl.mapping这个包下 --> <sqlMapGenerator targetPackage= "me.gacl.mapping" targetProject= "C:\Users\gacl\spring-mybatis\src\main\java" > <property name= "enableSubPackages" value= "true" /> </sqlMapGenerator> <!-- 生成DAO的包名和位置,这里配置将生成的dao类放在me.gacl.dao这个包下 --> <javaClientGenerator type= "XMLMAPPER" targetPackage= "me.gacl.dao" targetProject= "C:\Users\gacl\spring-mybatis\src\main\java" > <property name= "enableSubPackages" value= "true" /> </javaClientGenerator> <!-- 要生成那些表(更改tableName和domainObjectName就可以) --> <table tableName= "t_user" domainObjectName= "User" enableCountByExample= "false" enableUpdateByExample= "false" enableDeleteByExample= "false" enableSelectByExample= "false" selectByExampleQueryId= "false" /> </context> </generatorConfiguration> |
打开命令行窗口,切换到生成工具的根目录下,执行如下命令:
1
|
java -jar mybatis-generator-core- 1.3 . 2 .jar -configfile generator.xml -overwrite |
如下图所示:
刚才我们在generator.xml文件中配置将生成的代码和SQL映射文件放到"C:\Users\gacl\spring4-mybatis3\src\main\java"这个目录下,这个目录就是我们的spring4-mybatis3项目所在目录,我们刷新一下src/main/java目录,就可以看到生成的代码和映射文件了,如下图所示:
生成的代码和映射文件一行都不用改,可以直接应用到项目当中。下面我们看一眼由generator工具生成的代码和映射文件:
1、生成的dao类
1
2
3
4
5
6
7
8
9
10
|
package me.gacl.dao; import me.gacl.domain.User; public interface UserMapper { int deleteByPrimaryKey(String userId); int insert(User record); int insertSelective(User record); User selectByPrimaryKey(String userId); int updateByPrimaryKeySelective(User record); int updateByPrimaryKey(User record); } |
生成的UserMapper是一个接口,里面定义了一些操作t_user表的增删改查方法。
2、生成的实体类
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
|
package me.gacl.domain; import java.util.Date; public class User { private String userId; private String userName; private Date userBirthday; private Double userSalary; public String getUserId() { return userId; } public void setUserId(String userId) { this .userId = userId == null ? null : userId.trim(); } public String getUserName() { return userName; } public void setUserName(String userName) { this .userName = userName == null ? null : userName.trim(); } public Date getUserBirthday() { return userBirthday; } public void setUserBirthday(Date userBirthday) { this .userBirthday = userBirthday; } public Double getUserSalary() { return userSalary; } public void setUserSalary(Double userSalary) { this .userSalary = userSalary; } } |
User类是t_user表的对应的实体类,User类中定义的属性和t_user表中的字段一一对应。
3、生成的SQL映射文件
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
|
<?xml version= "." encoding= "UTF-" ?> <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper .//EN" "http://mybatis.org/dtd/mybatis--mapper.dtd" > <mapper namespace= "me.gacl.dao.UserMapper" > <resultMap id= "BaseResultMap" type= "me.gacl.domain.User" > <id column= "user_id" property= "userId" jdbcType= "CHAR" /> <result column= "user_name" property= "userName" jdbcType= "VARCHAR" /> <result column= "user_birthday" property= "userBirthday" jdbcType= "DATE" /> <result column= "user_salary" property= "userSalary" jdbcType= "DOUBLE" /> </resultMap> <sql id= "Base_Column_List" > user_id, user_name, user_birthday, user_salary </sql> <select id= "selectByPrimaryKey" resultMap= "BaseResultMap" parameterType= "java.lang.String" > select <include refid= "Base_Column_List" /> from t_user where user_id = #{userId,jdbcType=CHAR} </select> <delete id= "deleteByPrimaryKey" parameterType= "java.lang.String" > delete from t_user where user_id = #{userId,jdbcType=CHAR} </delete> <insert id= "insert" parameterType= "me.gacl.domain.User" > insert into t_user (user_id, user_name, user_birthday, user_salary) values (#{userId,jdbcType=CHAR}, #{userName,jdbcType=VARCHAR}, #{userBirthday,jdbcType=DATE}, #{userSalary,jdbcType=DOUBLE}) </insert> <insert id= "insertSelective" parameterType= "me.gacl.domain.User" > insert into t_user <trim prefix= "(" suffix= ")" suffixOverrides= "," > < if test= "userId != null" > user_id, </ if > < if test= "userName != null" > user_name, </ if > < if test= "userBirthday != null" > user_birthday, </ if > < if test= "userSalary != null" > user_salary, </ if > </trim> <trim prefix= "values (" suffix= ")" suffixOverrides= "," > < if test= "userId != null" > #{userId,jdbcType=CHAR}, </ if > < if test= "userName != null" > #{userName,jdbcType=VARCHAR}, </ if > < if test= "userBirthday != null" > #{userBirthday,jdbcType=DATE}, </ if > < if test= "userSalary != null" > #{userSalary,jdbcType=DOUBLE}, </ if > </trim> </insert> <update id= "updateByPrimaryKeySelective" parameterType= "me.gacl.domain.User" > update t_user <set > < if test= "userName != null" > user_name = #{userName,jdbcType=VARCHAR}, </ if > < if test= "userBirthday != null" > user_birthday = #{userBirthday,jdbcType=DATE}, </ if > < if test= "userSalary != null" > user_salary = #{userSalary,jdbcType=DOUBLE}, </ if > </set> where user_id = #{userId,jdbcType=CHAR} </update> <update id= "updateByPrimaryKey" parameterType= "me.gacl.domain.User" > update t_user set user_name = #{userName,jdbcType=VARCHAR}, user_birthday = #{userBirthday,jdbcType=DATE}, user_salary = #{userSalary,jdbcType=DOUBLE} where user_id = #{userId,jdbcType=CHAR} </update> </mapper> |
UserMapper.xml这个文件的内容是编写操作t_user表的SQL语句,重点说一下UserMapper.xml配置中需要注意的几个小细节问题:
1、UserMapper.xml的<mapper>标签的namespace必须是UserMapper接口的全类名,既<mapper namespace="me.gacl.dao.UserMapper" >
2、UserMapper.xml的定义操作数据库的<select><delete><update><insert>这些标签的id属性的值必须和UserMapper接口定义的方法名一致,如下图所示:
之所以有上述说的这两点要求,就是为了能够让MyBatis能够根据UserMapper接口和UserMapper.xml文件去自动实现UserMapper接口中定义的相关方法,这样我们就不再需要针对UserMapper接口去编写具体的实现代码了。
四、Spring与MyBatis整合
首先我们要在项目中加入我们需要的相关jar包,我们可以到Maven的中央仓库:http://search.maven.org/找到我们要的相关jar包,如下图所示:
我们只需要在搜索框中输入要找的jar包的名称,点击【SEARCH】按钮,就可以找到我们要的jar包了。
4.1、添加Spring与Mybatis的相关jar包
1、添加spring-core,输入spring-core关键字进行查找,如下图所示:
找到关于spring-core的依赖描述信息,如下图所示:
将
1
2
3
4
5
|
<dependency> <groupId>org.springframework</groupId> <artifactId>spring-core</artifactId> <version> 4.1 . 4 .RELEASE</version> </dependency> |
复制到项目的pom.xml文件中,如下所示:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
|
<project xmlns= "http://maven.apache.org/POM/4.0.0" xmlns:xsi= "http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation= "http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd" > <modelVersion> 4.0 . 0 </modelVersion> <groupId>me.gacl</groupId> <artifactId>spring4-mybatis3</artifactId> <packaging>war</packaging> <version> 1.0 -SNAPSHOT</version> <name>spring4-mybatis3</name> <url>http: //maven.apache.org</url> <dependencies> <!-- 添加Spring4. 1.4 的核心包 --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-core</artifactId> <version> 4.1 . 4 .RELEASE</version> </dependency> </dependencies> <build> <finalName>spring4-mybatis3</finalName> </build> </project> |
这样Maven就会自动帮我们从Maven的中央仓库中下载spring-core这个jar包到我们的本地仓库,然后将spring-core这个jar包以及它的相关依赖包加入到我们的项目当中,如下所示:
spring4.x与mybatis3.x所需要的相关jar包都可以采用上述所说的方式进行查找,然后添加到项目当中,添加完spring4.x与mybatis3.x相关jar包后,pom.xml文件内容最终如下:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
|
<project xmlns= "http://maven.apache.org/POM/.." xmlns:xsi= "http://www.w.org//XMLSchema-instance" xsi:schemaLocation= "http://maven.apache.org/POM/.. http://maven.apache.org/maven-v__.xsd" > <modelVersion>..</modelVersion> <groupId>me.gacl</groupId> <artifactId>spring-mybatis</artifactId> <packaging>war</packaging> <version>.-SNAPSHOT</version> <name>spring-mybatis</name> <url>http: //maven.apache.org</url> <dependencies> <!-- 添加Spring-core包 --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-core</artifactId> <version>...RELEASE</version> </dependency> <!-- 添加spring-context包 --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>...RELEASE</version> </dependency> <!-- 添加spring-tx包 --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-tx</artifactId> <version>...RELEASE</version> </dependency> <!-- 添加spring-jdbc包 --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> <version>...RELEASE</version> </dependency> <!-- 为了方便进行单元测试,添加spring-test包 --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-test</artifactId> <version>...RELEASE</version> </dependency> <!--添加spring-web包 --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-web</artifactId> <version>...RELEASE</version> </dependency> <!--添加aspectjweaver包 --> <dependency> <groupId>org.aspectj</groupId> <artifactId>aspectjweaver</artifactId> <version>..</version> </dependency> <!-- 添加mybatis的核心包 --> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>..</version> </dependency> <!-- 添加mybatis与Spring整合的核心包 --> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis-spring</artifactId> <version>..</version> </dependency> <!-- 添加servlet.核心包 --> <dependency> <groupId>javax.servlet</groupId> <artifactId>javax.servlet-api</artifactId> <version>..</version> </dependency> <dependency> <groupId>javax.servlet.jsp</groupId> <artifactId>javax.servlet.jsp-api</artifactId> <version>..-b</version> </dependency> <!-- jstl --> <dependency> <groupId>javax.servlet</groupId> <artifactId>jstl</artifactId> <version>.</version> </dependency> <!-- 添加mysql驱动包 --> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>..</version> </dependency> <!-- 添加druid连接池包 --> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid</artifactId> <version>..</version> </dependency> <!-- 添加junit单元测试包 --> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>.</version> <scope>test</scope> </dependency> </dependencies> <build> <finalName>spring-mybatis</finalName> </build> </project> |
4.2、编写相关配置文件
1、dbconfig.properties
在src/main/resources目录下创建一个dbconfig.properties文件,用于编写连接MySQL数据库的相关信息,dbconfig.properties的内容如下:
1
2
3
4
5
|
driverClassName=com.mysql.jdbc.Driver validationQuery=SELECT 1 jdbc_url=jdbc:mysql: //localhost:3306/spring4_mybatis3?useUnicode=true&characterEncoding=UTF-8&zeroDateTimeBehavior=convertToNull jdbc_username=root jdbc_password=XDP |
2、spring.xml(spring框架的配置文件)
在src/main/resources目录下创建一个spring.xml文件,spring.xml文件就是针对Spring框架编写的核心配置文件,spring.xml的内容如下:
1
2
3
4
5
6
7
8
9
10
11
12
13
|
<?xml version= "1.0" encoding= "UTF-8" ?> <beans xmlns= "http://www.springframework.org/schema/beans" xmlns:xsi= "http://www.w3.org/2001/XMLSchema-instance" xmlns:context= "http://www.springframework.org/schema/context" xsi:schemaLocation=" http: //www.springframework.org/schema/beans http: //www.springframework.org/schema/beans/spring-beans-3.0.xsd http: //www.springframework.org/schema/context http: //www.springframework.org/schema/context/spring-context-3.0.xsd"> <!-- 引入dbconfig.properties属性文件 --> <context:property-placeholder location= "classpath:dbconfig.properties" /> <!-- 自动扫描(自动注入),扫描me.gacl.service这个包以及它的子包的所有使用 @Service 注解标注的类 --> <context:component-scan base- package = "me.gacl.service" /> </beans> |
我们的spring.xml文件的配置非常简单,就两个配置。
3、spring-mybatis.xml(spring与mybatis整合的配置文件)
在src/main/resources目录下创建一个spring-mybatis.xml文件,spring-mybatis.xml文件就是针对Spring框架与Mybatis框架整合编写的配置文件,spring-mybatis.xml的内容如下:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
|
<?xml version= "1.0" encoding= "UTF-8" ?> <beans xmlns= "http://www.springframework.org/schema/beans" xmlns:xsi= "http://www.w3.org/2001/XMLSchema-instance" xmlns:tx= "http://www.springframework.org/schema/tx" xmlns:aop= "http://www.springframework.org/schema/aop" xsi:schemaLocation=" http: //www.springframework.org/schema/beans http: //www.springframework.org/schema/beans/spring-beans-3.0.xsd http: //www.springframework.org/schema/tx http: //www.springframework.org/schema/tx/spring-tx-3.0.xsd http: //www.springframework.org/schema/aop http: //www.springframework.org/schema/aop/spring-aop-3.0.xsd "> <!-- JNDI方式配置数据源 --> <!-- <bean id= "dataSource" class = "org.springframework.jndi.JndiObjectFactoryBean" > <property name= "jndiName" value= "${jndiName}" ></property> </bean> --> <!-- ========================================配置数据源========================================= --> <!-- 配置数据源,使用的是alibaba的Druid(德鲁伊)数据源 --> <bean name= "dataSource" class = "com.alibaba.druid.pool.DruidDataSource" init-method= "init" destroy-method= "close" > <property name= "url" value= "${jdbc_url}" /> <property name= "username" value= "${jdbc_username}" /> <property name= "password" value= "${jdbc_password}" /> <!-- 初始化连接大小 --> <property name= "initialSize" value= "0" /> <!-- 连接池最大使用连接数量 --> <property name= "maxActive" value= "20" /> <!-- 连接池最大空闲 --> <property name= "maxIdle" value= "20" /> <!-- 连接池最小空闲 --> <property name= "minIdle" value= "0" /> <!-- 获取连接最大等待时间 --> <property name= "maxWait" value= "60000" /> <!-- <property name= "poolPreparedStatements" value= "true" /> <property name= "maxPoolPreparedStatementPerConnectionSize" value= "33" /> --> <property name= "validationQuery" value= "${validationQuery}" /> <property name= "testOnBorrow" value= "false" /> <property name= "testOnReturn" value= "false" /> <property name= "testWhileIdle" value= "true" /> <!-- 配置间隔多久才进行一次检测,检测需要关闭的空闲连接,单位是毫秒 --> <property name= "timeBetweenEvictionRunsMillis" value= "60000" /> <!-- 配置一个连接在池中最小生存的时间,单位是毫秒 --> <property name= "minEvictableIdleTimeMillis" value= "25200000" /> <!-- 打开removeAbandoned功能 --> <property name= "removeAbandoned" value= "true" /> <!-- 1800 秒,也就是 30 分钟 --> <property name= "removeAbandonedTimeout" value= "1800" /> <!-- 关闭abanded连接时输出错误日志 --> <property name= "logAbandoned" value= "true" /> <!-- 监控数据库 --> <!-- <property name= "filters" value= "stat" /> --> <property name= "filters" value= "mergeStat" /> </bean> <!-- ========================================分隔线========================================= --> <!-- ========================================针对myBatis的配置项============================== --> <!-- 配置sqlSessionFactory --> <bean id= "sqlSessionFactory" class = "org.mybatis.spring.SqlSessionFactoryBean" > <!-- 实例化sqlSessionFactory时需要使用上述配置好的数据源以及SQL映射文件 --> <property name= "dataSource" ref= "dataSource" /> <!-- 自动扫描me/gacl/mapping/目录下的所有SQL映射的xml文件, 省掉Configuration.xml里的手工配置 value= "classpath:me/gacl/mapping/*.xml" 指的是classpath(类路径)下me.gacl.mapping包中的所有xml文件 UserMapper.xml位于me.gacl.mapping包下,这样UserMapper.xml就可以被自动扫描 --> <property name= "mapperLocations" value= "classpath:me/gacl/mapping/*.xml" /> </bean> <!-- 配置扫描器 --> <bean class = "org.mybatis.spring.mapper.MapperScannerConfigurer" > <!-- 扫描me.gacl.dao这个包以及它的子包下的所有映射接口类 --> <property name= "basePackage" value= "me.gacl.dao" /> <property name= "sqlSessionFactoryBeanName" value= "sqlSessionFactory" /> </bean> <!-- ========================================分隔线========================================= --> <!-- 配置Spring的事务管理器 --> <bean id= "transactionManager" class = "org.springframework.jdbc.datasource.DataSourceTransactionManager" > <property name= "dataSource" ref= "dataSource" /> </bean> <!-- 注解方式配置事物 --> <!-- <tx:annotation-driven transaction-manager= "transactionManager" /> --> <!-- 拦截器方式配置事物 --> <tx:advice id= "transactionAdvice" transaction-manager= "transactionManager" > <tx:attributes> <tx:method name= "add*" propagation= "REQUIRED" /> <tx:method name= "append*" propagation= "REQUIRED" /> <tx:method name= "insert*" propagation= "REQUIRED" /> <tx:method name= "save*" propagation= "REQUIRED" /> <tx:method name= "update*" propagation= "REQUIRED" /> <tx:method name= "modify*" propagation= "REQUIRED" /> <tx:method name= "edit*" propagation= "REQUIRED" /> <tx:method name= "delete*" propagation= "REQUIRED" /> <tx:method name= "remove*" propagation= "REQUIRED" /> <tx:method name= "repair" propagation= "REQUIRED" /> <tx:method name= "delAndRepair" propagation= "REQUIRED" /> <tx:method name= "get*" propagation= "SUPPORTS" /> <tx:method name= "find*" propagation= "SUPPORTS" /> <tx:method name= "load*" propagation= "SUPPORTS" /> <tx:method name= "search*" propagation= "SUPPORTS" /> <tx:method name= "datagrid*" propagation= "SUPPORTS" /> <tx:method name= "*" propagation= "SUPPORTS" /> </tx:attributes> </tx:advice> <aop:config> <aop:pointcut id= "transactionPointcut" expression= "execution(* me.gacl.service..*Impl.*(..))" /> <aop:advisor pointcut-ref= "transactionPointcut" advice-ref= "transactionAdvice" /> </aop:config> <!-- 配置druid监控spring jdbc --> <bean id= "druid-stat-interceptor" class = "com.alibaba.druid.support.spring.stat.DruidStatInterceptor" > </bean> <bean id= "druid-stat-pointcut" class = "org.springframework.aop.support.JdkRegexpMethodPointcut" scope= "prototype" > <property name= "patterns" > <list> <value>me.gacl.service.*</value> </list> </property> </bean> <aop:config> <aop:advisor advice-ref= "druid-stat-interceptor" pointcut-ref= "druid-stat-pointcut" /> </aop:config> </beans> |
到此,相关的配置文件算是编写完成了,如下图所示:
4.3、进行单元测试
经过以上两个步骤,spring4与mybatis3的整合算是全部完成了。接下来我们要做的工作就算进行单元测试,测试一下spring4与mybatis3的整合是否成功。
1、在src/main/java目录下创建一个me.gacl.service包,然后在me.gacl.service包创建一个UserServiceI接口,如下所示:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
|
package me.gacl.service; import me.gacl.domain.User; public interface UserServiceI { /** * 添加用户 * @param user */ void addUser(User user); /** * 根据用户id获取用户 * @param userId * @return */ User getUserById(String userId); } |
2、在src/main/java目录下创建一个me.gacl.service.impl包,然后在me.gacl.service.impl包创建一个针对UserServiceI接口的实现类:UserServiceImpl,如下所示:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
|
package me.gacl.service.impl; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import me.gacl.dao.UserMapper; import me.gacl.domain.User; import me.gacl.service.UserServiceI; /** * @author gacl * 使用@Service注解将UserServiceImpl类标注为一个service * service的id是userService */ @Service ( "userService" ) public class UserServiceImpl implements UserServiceI { /** * 使用@Autowired注解标注userMapper变量, * 当需要使用UserMapper时,Spring就会自动注入UserMapper */ @Autowired private UserMapper userMapper; //注入dao @Override public void addUser(User user) { userMapper.insert(user); } @Override public User getUserById(String userId) { return userMapper.selectByPrimaryKey(userId); } } |
创建好的两个类如下所示:
3、在src/test/java目录下编写单元测试类,新建一个me.gacl.test包,然后在这个包下创建一个MyBatisTest类,代码如下:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
|
package me.gacl.test; import java.util.Date; import java.util.UUID; import me.gacl.domain.User; import me.gacl.service.UserServiceI; //import me.gacl.service.UserServiceI; import org.junit.Before; import org.junit.Test; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; public class MyBatisTest { private UserServiceI userService; /** * 这个before方法在所有的测试方法之前执行,并且只执行一次 * 所有做Junit单元测试时一些初始化工作可以在这个方法里面进行 * 比如在before方法里面初始化ApplicationContext和userService */ @Before public void before(){ //使用"spring.xml"和"spring-mybatis.xml"这两个配置文件创建Spring上下文 ApplicationContext ac = new ClassPathXmlApplicationContext( new String[]{ "spring.xml" , "spring-mybatis.xml" }); //从Spring容器中根据bean的id取出我们要使用的userService对象 userService = (UserServiceI) ac.getBean( "userService" ); } @Test public void testAddUser(){ //ApplicationContext ac = new ClassPathXmlApplicationContext(new String[]{"spring.xml","spring-mybatis.xml"}); //UserServiceI userService = (UserServiceI) ac.getBean("userService"); User user = new User(); user.setUserId(UUID.randomUUID().toString().replaceAll( "-" , "" )); user.setUserName( "白虎神皇xdp" ); user.setUserBirthday( new Date()); user.setUserSalary(D); userService.addUser(user); } } |
执行单元测试代码,这时候会报如下错误:
错误提示是说没有找到"me.gacl.test.MyBatisTest"这个类,这是因为我们没有使用maven编译项目中的类的缘故。
下面我们使用Maven编译项目,选中项目的pom.xml文件→【Debug As】→【maven install】,如下所示:
编译结果如下:
在这里说一下我执行Maven install之后遇到的问题,第一次执行Maven install命令时,就出现了如下一堆乱七八糟的错误:
后来我把项目删掉,再重新导入项目,然后再执行Clean项目操作之后,如下图所示:
再执行Maven install操作又可以正常编译通过了,这让我郁闷了好久,这应该不是我项目配置的原因,而是Maven的原因,具体也不知道为啥会这样。反正这算是一种解决办法吧,如果遇到执行Maven install操作不能正常编译通过的情况:可以尝试采用:Maven clean→Clean项目→Maven install这三个步骤去解决问题。
除了可以用常规的Junit进行单元测试之外,我们还可以使用Spring提供的Junit测试框架进行单元测试,在me.gacl.test下新建一个MyBatisTestBySpringTestFramework类,代码如下:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
|
package me.gacl.test; import java.util.Date; import java.util.UUID; import me.gacl.domain.User; import me.gacl.service.UserServiceI; import org.junit.Test; import org.junit.runner.RunWith; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.test.context.ContextConfiguration; import org.springframework.test.context.junit.SpringJUnitClassRunner; @RunWith (SpringJUnitClassRunner. class ) //配置了@ContextConfiguration注解并使用该注解的locations属性指明spring和配置文件之后, @ContextConfiguration (locations = { "classpath:spring.xml" , "classpath:spring-mybatis.xml" }) public class MyBatisTestBySpringTestFramework { //注入userService @Autowired private UserServiceI userService; @Test public void testAddUser(){ User user = new User(); user.setUserId(UUID.randomUUID().toString().replaceAll( "-" , "" )); user.setUserName( "xdp_gacl_白虎神皇" ); user.setUserBirthday( new Date()); user.setUserSalary(D); userService.addUser(user); } @Test public void testGetUserById(){ String userId = "fbcebfdada" ; User user = userService.getUserById(userId); System.out.println(user.getUserName()); } } |
执行这两个测试方法,是可以正常测试通过的,如下所示:
到此,我们框架的整合测试工作就算是全部通过了,整合成功。
4.4、在web服务器中进行测试
1、编辑web.xml文件,添加spring监听器配置项,内容如下:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
|
<?xml version= "1.0" encoding= "UTF-8" ?> <web-app xmlns= "http://java.sun.com/xml/ns/javaee" xmlns:xsi= "http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http: //java.sun.com/xml/ns/javaee http: //java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version= "3.0" > <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> <listener> <description>Spring监听器</description> <listener- class >org.springframework.web.context.ContextLoaderListener</listener- class > </listener> <!-- ContextLoaderListener初始化Spring上下文时需要使用到的contextConfigLocation参数 --> <context-param> <param-name>contextConfigLocation</param-name> <!-- 配置spring.xml和spring-mybatis.xml这两个配置文件的位置,固定写法 --> <param-value>classpath:spring.xml,classpath:spring-mybatis.xml</param-value> </context-param> </web-app> |
2、在UserMapper接口中添加一个获取所有用户信息的getAllUser()方法,如下所示:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
|
package me.gacl.dao; import java.util.List; import me.gacl.domain.User; public interface UserMapper { int deleteByPrimaryKey(String userId); int insert(User record); int insertSelective(User record); User selectByPrimaryKey(String userId); int updateByPrimaryKeySelective(User record); int updateByPrimaryKey(User record); /**获取所有用户信息 * @return List<User> */ List<User> getAllUser(); } |
3、在UserMapper.xml文件中编写getAllUser()方法要执行的SQL语句,如下所示:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
|
<?xml version= "1.0" encoding= "UTF-8" ?> <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" > <mapper namespace= "me.gacl.dao.UserMapper" > <resultMap id= "BaseResultMap" type= "me.gacl.domain.User" > <id column= "user_id" property= "userId" jdbcType= "CHAR" /> <result column= "user_name" property= "userName" jdbcType= "VARCHAR" /> <result column= "user_birthday" property= "userBirthday" jdbcType= "DATE" /> <result column= "user_salary" property= "userSalary" jdbcType= "DOUBLE" /> </resultMap> <sql id= "Base_Column_List" > user_id, user_name, user_birthday, user_salary </sql> <select id= "selectByPrimaryKey" resultMap= "BaseResultMap" parameterType= "java.lang.String" > select <include refid= "Base_Column_List" /> from t_user where user_id = #{userId,jdbcType=CHAR} </select> <delete id= "deleteByPrimaryKey" parameterType= "java.lang.String" > delete from t_user where user_id = #{userId,jdbcType=CHAR} </delete> <insert id= "insert" parameterType= "me.gacl.domain.User" > insert into t_user (user_id, user_name, user_birthday, user_salary) values (#{userId,jdbcType=CHAR}, #{userName,jdbcType=VARCHAR}, #{userBirthday,jdbcType=DATE}, #{userSalary,jdbcType=DOUBLE}) </insert> <insert id= "insertSelective" parameterType= "me.gacl.domain.User" > insert into t_user <trim prefix= "(" suffix= ")" suffixOverrides= "," > < if test= "userId != null" > user_id, </ if > < if test= "userName != null" > user_name, </ if > < if test= "userBirthday != null" > user_birthday, </ if > < if test= "userSalary != null" > user_salary, </ if > </trim> <trim prefix= "values (" suffix= ")" suffixOverrides= "," > < if test= "userId != null" > #{userId,jdbcType=CHAR}, </ if > < if test= "userName != null" > #{userName,jdbcType=VARCHAR}, </ if > < if test= "userBirthday != null" > #{userBirthday,jdbcType=DATE}, </ if > < if test= "userSalary != null" > #{userSalary,jdbcType=DOUBLE}, </ if > </trim> </insert> <update id= "updateByPrimaryKeySelective" parameterType= "me.gacl.domain.User" > update t_user <set > < if test= "userName != null" > user_name = #{userName,jdbcType=VARCHAR}, </ if > < if test= "userBirthday != null" > user_birthday = #{userBirthday,jdbcType=DATE}, </ if > < if test= "userSalary != null" > user_salary = #{userSalary,jdbcType=DOUBLE}, </ if > </set> where user_id = #{userId,jdbcType=CHAR} </update> <update id= "updateByPrimaryKey" parameterType= "me.gacl.domain.User" > update t_user set user_name = #{userName,jdbcType=VARCHAR}, user_birthday = #{userBirthday,jdbcType=DATE}, user_salary = #{userSalary,jdbcType=DOUBLE} where user_id = #{userId,jdbcType=CHAR} </update> <!-- ==============以下内容是根据自身业务扩展的内容======================= --> <!-- select标签的id属性与UserMapper接口中定义的getAllUser方法要一模一样 --> <select id= "getAllUser" resultMap= "BaseResultMap" > select user_id, user_name, user_birthday, user_salary from t_user </select> </mapper> |
4、在UserServiceI接口中也添加一个getAllUser()方法,如下:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
|
package me.gacl.service; import java.util.List; import me.gacl.domain.User; public interface UserServiceI { /** * 添加用户 * @param user */ void addUser(User user); /** * 根据用户id获取用户 * @param userId * @return */ User getUserById(String userId); /**获取所有用户信息 * @return List<User> */ List<User> getAllUser(); } |
5、在UserServiceImpl类中实现getAllUser方法,如下:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
|
package me.gacl.service.impl; import java.util.List; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import me.gacl.dao.UserMapper; import me.gacl.domain.User; import me.gacl.service.UserServiceI; /** * @author gacl * 使用@Service注解将UserServiceImpl类标注为一个service * service的id是userService */ @Service ( "userService" ) public class UserServiceImpl implements UserServiceI { /** * 使用@Autowired注解标注userMapper变量, * 当需要使用UserMapper时,Spring就会自动注入UserMapper */ @Autowired private UserMapper userMapper; //注入dao @Override public void addUser(User user) { userMapper.insert(user); } @Override public User getUserById(String userId) { return userMapper.selectByPrimaryKey(userId); } @Override public List<User> getAllUser() { return userMapper.getAllUser(); } } |
6、在src/main/java目录下创建一个me.gacl.web.controller包,然后在me.gacl.web.controller下创建一个UserServlet,如下:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
|
package me.gacl.web.controller; import java.io.IOException; import java.util.List; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.springframework.context.ApplicationContext; import org.springframework.web.context.support.WebApplicationContextUtils; import me.gacl.domain.User; import me.gacl.service.UserServiceI; /** * @author gacl * @WebServlet是Servlet.提供的注解,目的是将一个继承了HttpServlet类的普通java类标注为一个Servlet * UserServlet使用了@WebServlet标注之后,就不需要在web.xml中配置了 */ @WebServlet ( "/UserServlet" ) public class UserServlet extends HttpServlet { //处理业务逻辑的userService private UserServiceI userService; public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //获取所有的用户信息 List<User> lstUsers = userService.getAllUser(); request.setAttribute( "lstUsers" , lstUsers); request.getRequestDispatcher( "/index.jsp" ).forward(request, response); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this .doGet(request, response); } public void init() throws ServletException { //在Servlet初始化时获取Spring上下文对象(ApplicationContext) ApplicationContext ac = WebApplicationContextUtils.getWebApplicationContext( this .getServletContext()); //从ApplicationContext中获取userService userService = (UserServiceI) ac.getBean( "userService" ); } } |
7、编辑index.jsp页面,用于展示查询到的用户信息,内容如下:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
|
<%@ page language= "java" pageEncoding= "UTF-8" %> <%--引入JSTL核心标签库 --%> <%@ taglib prefix= "c" uri= "http://java.sun.com/jsp/jstl/core" %> <!DOCTYPE html> <html> <head> <title>显示用户信息</title> <style type= "text/css" > table,td{ border: 1px solid; border-collapse: collapse; } </style> </head> <body> <table> <tr> <td>用户ID</td> <td>用户名</td> <td>用户生日</td> <td>工资</td> </tr> <%--遍历lstUsers集合中的User对象 --%> <c:forEach var= "user" items= "${lstUsers}" > <tr> <td>${user.userId}</td> <td>${user.userName}</td> <td>${user.userBirthday}</td> <td>${user.userSalary}</td> </tr> </c:forEach> </table> </body> </html> |
8、执行maven install命令编译项目,然后将项目部署到tomcat服务器中运行,注意,由于要使用Servlet3.0,所以必须将项目部署到tomcat7.x以上的服务器中去运行,如下所示:
输入地址:http://localhost:8080/spring4-mybatis3/UserServlet访问UserServlet,访问结果如下:
可以看到,t_user表中的用户信息全部查询出来显示到页面上了。这样在web服务器中的测试也正常通过了。
以上就是Spring4.x与MyBatis3.x整合的全部内容了。编写这个整合例子花了不少时间,使用Maven编译时总是出现莫名其妙的问题,有时候成功,有时候失败,反正很莫名其妙。如果遇到执行Maven install操作不能正常编译通过的情况:可以尝试采用:Maven clean→Clean项目→Maven install这三个步骤去解决问题