阅读本文需要又一定的sping基础,最起码要成功的运行过一个SpringMvc项目。
在传统的Spring项目中,我们要写一堆的XML文件。而这些XML文件格式要求又很严格,很不便于开发。而网上所谓的0配置,并不是纯粹的0配置,还是要写一些xml配置,只是用了几个@Service,@Controller注解而已。
在这里,我讲介绍一种新的配置方式,一行XML代码都不需要,什么web.xml,Application-context.xml,Beans.xml,统统去死吧!
首先建立一个Maven项目,Packageing方式为war,项目结构为标准Maven WebApp结构。
pom文件如下(很多依赖都没用,懒得去掉了):
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< 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 >com.csonezp</ groupId > < artifactId >springdemo</ artifactId > < packaging >war</ packaging > < version >1.0-SNAPSHOT</ version > < name >dataplatform Maven Webapp</ name > < url >http://maven.apache.org</ url > < properties > < spring.version >4.0.1.RELEASE</ spring.version > </ properties > < dependencies > < dependency > < groupId >junit</ groupId > < artifactId >junit</ artifactId > < version >4.11</ version > </ dependency > <!-- Spring dependencies --> < dependency > < groupId >asm</ groupId > < artifactId >asm-commons</ artifactId > < version >2.2.3</ version > </ dependency > < dependency > < groupId >asm</ groupId > < artifactId >asm</ artifactId > < version >2.2.3</ version > </ dependency > < dependency > < groupId >org.springframework</ groupId > < artifactId >spring-core</ artifactId > < version >${spring.version}</ version > </ dependency > < dependency > < groupId >org.springframework</ groupId > < artifactId >spring-web</ artifactId > < version >${spring.version}</ version > </ dependency > < dependency > < groupId >org.springframework</ groupId > < artifactId >spring-orm</ artifactId > < version >${spring.version}</ version > </ dependency > < dependency > < groupId >org.springframework</ groupId > < artifactId >spring-jdbc</ artifactId > < version >${spring.version}</ version > </ dependency > < dependency > < groupId >org.springframework</ groupId > < artifactId >spring-context</ artifactId > < version >${spring.version}</ version > </ dependency > < dependency > < groupId >org.springframework</ groupId > < artifactId >spring-aop</ artifactId > < version >${spring.version}</ version > </ dependency > < dependency > < groupId >org.springframework</ groupId > < artifactId >spring-expression</ artifactId > < version >${spring.version}</ version > </ dependency > < dependency > < groupId >org.springframework</ groupId > < artifactId >spring-test</ artifactId > < version >${spring.version}</ version > </ dependency > < dependency > < groupId >org.springframework</ groupId > < artifactId >spring-tx</ artifactId > < version >${spring.version}</ version > </ dependency > < dependency > < groupId >org.springframework</ groupId > < artifactId >spring-webmvc</ artifactId > < version >${spring.version}</ version > </ dependency > < dependency > < groupId >cglib</ groupId > < artifactId >cglib</ artifactId > < version >2.2.2</ version > </ dependency > <!-- Servlet API, JSTL --> < dependency > < groupId >javax.servlet</ groupId > < artifactId >javax.servlet-api</ artifactId > < version >3.0.1</ version > < scope >provided</ scope > </ dependency > < dependency > < groupId >jstl</ groupId > < artifactId >jstl</ artifactId > < version >1.2</ version > </ dependency > < dependency > < groupId >org.codehaus.jackson</ groupId > < artifactId >jackson-core-asl</ artifactId > < version >1.8.4</ version > </ dependency > < dependency > < groupId >org.codehaus.jackson</ groupId > < artifactId >jackson-mapper-asl</ artifactId > < version >1.8.4</ version > </ dependency > < dependency > < groupId >c3p0</ groupId > < artifactId >c3p0</ artifactId > < version >0.9.1.2</ version > </ dependency > < dependency > < groupId >log4j</ groupId > < artifactId >log4j</ artifactId > < version >1.2.8</ version > </ dependency > < dependency > < groupId >org.json</ groupId > < artifactId >json</ artifactId > < version >20090211</ version > </ dependency > < dependency > < groupId >mysql</ groupId > < artifactId >mysql-connector-java</ artifactId > < version >5.1.6</ version > </ dependency > < dependency > < groupId >spy</ groupId > < artifactId >spymemcached</ artifactId > < version >2.6</ version > </ dependency > < dependency > < groupId >org.slf4j</ groupId > < artifactId >slf4j-api</ artifactId > < version >1.6.6</ version > </ dependency > </ dependencies > < build > < finalName >dataplatform</ finalName > </ build > </ project > |
这个时候,就该进行Spring配置了。按传统方式来的话,首先要去web.xml写一堆配置,然后建立个管理beab的Beans.xml,管理spring mvc 的xml,再写一坨一坨Bean。就是先进一点的(也就是很多人说的0配置),也就是自己的业务Bean不用写进xml了,还是很麻烦。
而我这里讲的方式,则是完全不修改任何web.xml代码,不写一行XML代码的方式。
首先,在项目立建立一个Config.java文件:
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/** * Created by zhangpeng on 16-3-22. * 取代Beans.xml,纯注解配置各种BEAN */ @Configuration @ComponentScan ( "com.csonezp" ) @EnableWebMvc public class Config { /** * jsp视图解析器的bean * @return */ @Bean public UrlBasedViewResolver setupViewResolver() { UrlBasedViewResolver resolver = new UrlBasedViewResolver(); resolver.setPrefix( "/WEB-INF/" ); resolver.setSuffix( ".jsp" ); resolver.setViewClass(JstlView. class ); return resolver; } /** * 配置数据源 * @return */ @Bean (name = "dataSource" ) public ComboPooledDataSource getDataSource() { try { ComboPooledDataSource dataSource = new ComboPooledDataSource(); dataSource.setJdbcUrl( "jdbc:mysql://localhost:3306/mfdb" ); dataSource.setDriverClass( "com.mysql.jdbc.Driver" ); dataSource.setUser( "root" ); dataSource.setPassword( "zp1228" ); dataSource.setMaxPoolSize( 75 ); return dataSource; } catch (Exception e) { return null ; } } } |
@Configuration注解就是告诉Spring这个是一个配置文件类,这里配置的Bean要交给Spring去管理。这个就是用来取代Beans.xml这种文件的。
@ComponentScan("com.csonezp")这个注解就是配置包扫描用的,不必多说了
@EnableWebMvc ,启用Spring MVC支持
这里面配置了两个Bean,第一个就是JSP的视图解析器,第二个则是配置了一个数据源。这些都可以对应到XML文件里面去的。找一个传统Spring项目,用xml文件对比着我这个类去看,会对这种配置方式有更深的了解。
下面要建立一个WebInitializer类继承WebApplicationInitializer,在这里添加一个servlet。这一步是用来取代在web.xml中添加servlet的步骤
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import org.springframework.web.WebApplicationInitializer; import org.springframework.web.context.support.AnnotationConfigWebApplicationContext; import org.springframework.web.servlet.DispatcherServlet; import javax.servlet.ServletContext; import javax.servlet.ServletException; import javax.servlet.ServletRegistration.Dynamic; public class WebInitializer implements WebApplicationInitializer { public void onStartup(ServletContext servletContext) throws ServletException { AnnotationConfigWebApplicationContext ctx = new AnnotationConfigWebApplicationContext(); ctx.register(Config. class ); ctx.setServletContext(servletContext); Dynamic servlet = servletContext.addServlet( "dispatcher" , new DispatcherServlet(ctx)); servlet.addMapping( "/" ); servlet.setLoadOnStartup( 1 ); } } |
这样就OK啦!让我们写一些代码来测试一下吧!
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import org.springframework.stereotype.Service; /** * Created by zhangpeng on 16-3-22. */ @Service public class HelloService { public String getHello(String name) { return name + ",Hello!" ; } } |
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import com.guduo.dataplatform.service.HelloService; import com.guduo.dataplatform.service.MovieService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import org.springframework.ui.ModelMap; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestParam; /** * Created by zhangpeng on 16-3-22. */ @Controller @RequestMapping ( "/test" ) public class TestController { @Autowired HelloService helloService; @Autowired MovieService movieService; @RequestMapping ( "/hello" ) public String sayHello( @RequestParam ( "name" ) String name, ModelMap model) { model.put( "hello" , helloService.getHello(name)); return "hello" ; } } |
一个service,一个controller。
启动项目,在浏览器中输入地址http://localhost:8080/dp/test/hello?name=sss
页面显示sss,Hello!
完工!
额,忘了演示Confgig里配置的bean如何使用了。其实和XML里的一样。这里拿一个DAO做演示吧,这里就注入了我们在config里配置的那个数据源
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@Repository public class MoviePlayIncDao { private DataSource dataSource; private JdbcTemplate jdbcTemplateObject; @Autowired public void setDataSource(DataSource dataSource) { this .dataSource = dataSource; this .jdbcTemplateObject = new JdbcTemplate(dataSource); } public List<MoviePlayIncreament> getMoviePlayInc( int movieId) { try { String SQL = "select * from movieplayincreament where movieid=?" ; List<MoviePlayIncreament> list = jdbcTemplateObject.query(SQL, new MoviePlayIncMapper(), new Object[]{movieId}); return list; } catch (Exception e) { return null ; } } } |
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。
原文链接:http://www.cnblogs.com/csonezp/p/5315725.html