一、httpclient
两个系统间如何互相访问？两个tomcat上的项目如何互相访问？
采用httpclient实现跨系统的接口调用。
介绍：
官网：http://hc.apache.org/index.html
现在也叫：httpcomponents
httpclient可以发送get、post、put、delete、...等请求
使用：
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<dependency> <groupid>org.apache.httpcomponents</groupid> <artifactid>httpclient</artifactid> <version>4.4</version></dependency> |
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//1、使用httpclient发起get请求public class doget { public static void main(string[] args) throws exception { // 创建httpclient对象,相当于打开了浏览器 closeablehttpclient httpclient = httpclients.createdefault(); // 创建httpget请求，相当于在浏览器输入地址 httpget httpget = new httpget("http://www.baidu.com/"); closeablehttpresponse response = null; try { // 执行请求，相当于敲完地址后按下回车。获取响应 response = httpclient.execute(httpget); // 判断返回状态是否为200 if (response.getstatusline().getstatuscode() == 200) { // 解析响应，获取数据 string content = entityutils.tostring(response.getentity(), "utf-8"); system.out.println(content); } } finally { if (response != null) { // 关闭资源 response.close(); } // 关闭浏览器 httpclient.close(); } }} //2、使用httpclient发起带参数的get请求public class dogetparam { public static void main(string[] args) throws exception { // 创建httpclient对象 closeablehttpclient httpclient = httpclients.createdefault(); // 创建uri对象，并且设置请求参数 uri uri = new uribuilder("http://www.baidu.com/s").setparameter("wd", "java").build(); // 创建http get请求 httpget httpget = new httpget(uri); // httpget get = new httpget("http://www.baidu.com/s?wd=java"); closeablehttpresponse response = null; try { // 执行请求 response = httpclient.execute(httpget); // 判断返回状态是否为200 if (response.getstatusline().getstatuscode() == 200) { // 解析响应数据 string content = entityutils.tostring(response.getentity(), "utf-8"); system.out.println(content); } } finally { if (response != null) { response.close(); } httpclient.close(); } }} //3、使用httpclient发起post请求public class dopost { public static void main(string[] args) throws exception { // 创建httpclient对象 closeablehttpclient httpclient = httpclients.createdefault(); // 创建http post请求 httppost httppost = new httppost("http://www.oschina.net/"); // 把自己伪装成浏览器。否则开源中国会拦截访问 httppost.setheader("user-agent", "mozilla/5.0 (windows nt 10.0; wow64) applewebkit/537.36 (khtml, like gecko) chrome/56.0.2924.87 safari/537.36"); closeablehttpresponse response = null; try { // 执行请求 response = httpclient.execute(httppost); // 判断返回状态是否为200 if (response.getstatusline().getstatuscode() == 200) { // 解析响应数据 string content = entityutils.tostring(response.getentity(), "utf-8"); system.out.println(content); } } finally { if (response != null) { response.close(); } // 关闭浏览器 httpclient.close(); } }} //4、使用httpclient发起带有参数的post请求public class dopostparam { public static void main(string[] args) throws exception { // 创建httpclient对象 closeablehttpclient httpclient = httpclients.createdefault(); // 创建http post请求，访问开源中国 httppost httppost = new httppost("http://www.oschina.net/search"); // 根据开源中国的请求需要，设置post请求参数 list<namevaluepair> parameters = new arraylist<namevaluepair>(0); parameters.add(new basicnamevaluepair("scope", "project")); parameters.add(new basicnamevaluepair("q", "java")); parameters.add(new basicnamevaluepair("fromerr", "8bdnuwwc")); // 构造一个form表单式的实体 urlencodedformentity formentity = new urlencodedformentity(parameters); // 将请求实体设置到httppost对象中 httppost.setentity(formentity); closeablehttpresponse response = null; try { // 执行请求 response = httpclient.execute(httppost); // 判断返回状态是否为200 if (response.getstatusline().getstatuscode() == 200) { // 解析响应体 string content = entityutils.tostring(response.getentity(), "utf-8"); system.out.println(content); } } finally { if (response != null) { response.close(); } // 关闭浏览器 httpclient.close(); } }} |
二、resttemplate
resttemplate是spring提供的用于访问rest服务的客户端，resttemplate提供了多种便捷访问远程http服务的方法
http开发是用apache的httpclient开发，代码复杂，还得操心资源回收等。代码很复杂，冗余代码多。
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<dependency> <groupid>org.springframework.boot</groupid> <artifactid>spring-boot-starter-web</artifactid></dependency> |
创建resttemplate对象
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@configuration//加上这个注解作用，可以被spring扫描public class resttemplateconfig { /** * 创建resttemplate对象，将resttemplate对象的生命周期的管理交给spring * @return */ @bean public resttemplate resttemplate(){ resttemplate resttemplate = new resttemplate(); //主要解决中文乱码 resttemplate.getmessageconverters().set(1, new stringhttpmessageconverter(standardcharsets.utf_8)); return resttemplate; }} |
resttempcontroller
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import org.springframework.http.responseentity;import org.springframework.stereotype.controller;import org.springframework.web.bind.annotation.getmapping;import org.springframework.web.bind.annotation.requestmapping;import org.springframework.web.client.resttemplate; import javax.annotation.resource; @restcontroller@requestmapping("/consumer")public class consumercontroller { // 从spring的容器中获取resttemplate @resource private resttemplate resttemplate; /** * 通过get请求，保存数据 */ @getmapping("/{id}") public responseentity<string> findbyid(@pathvariable integer id){ //发起远程请求:通过resttemplate发起get请求 responseentity<string> entity = resttemplate.getforentity("http://localhost:8090/goods2/1", string.class); system.out.println("entity.getstatuscode():"+entity.getstatuscode()); system.out.println(entity.getbody()); return entity; } /** * 通过post请求，保存数据 */ @postmapping public responseentity<string> savegoods(@requestbody goods goods){ //通过resttemplate发起远程请求 /** * 第一个参数：远程地址uri * 第二个参数：数据 * 第三个参数：返回值类型 */ responseentity<string> entity = resttemplate.postforentity("http://localhost:8090/goods2", goods, string.class); system.out.println("entity.getstatuscode():"+entity.getstatuscode()); system.out.println(entity.getbody()); return entity; } @putmapping public responseentity<string> updategoods(@requestbody goods goods){ resttemplate.put("http://localhost:8090/goods2",goods); return new responseentity<>("修改成功", httpstatus.ok); } @deletemapping("/{id}") public responseentity<string> deletebyid(@pathvariable integer id){ resttemplate.delete("http://localhost:8090/goods2/"+id); return new responseentity<>("删除成功", httpstatus.ok); }} |
只用maven不用springboot框架时只需要导入依赖到pom文件
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<dependency> <groupid>org.springframework</groupid> <artifactid>spring-web</artifactid></dependency> |
直接new resttemplate()对象使用即可
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原文链接：https://blog.csdn.net/qq_44065303/article/details/114392582
