http 发送json到服务器，服务器处理之后返回结果

1.jar包如下：

commons-beanutils.jar
commons-codec-1.3.jar
commons-collections-3.2.jar
commons-httpclient-3.1.jar
commons-lang-2.1.jar
commons-logging-1.0.4.jar
ezmorph-1.0.6.jar
json-lib-2.3-jdk15.jar

2.新建客户端java 工程，新建HttpJsonDemo类，如下：

package com.sk.http.json;import java.io.IOException;import net.sf.json.JSONObject;import org.apache.commons.httpclient.HttpClient;import org.apache.commons.httpclient.HttpException;import org.apache.commons.httpclient.methods.PostMethod;import org.apache.commons.logging.Log;import org.apache.commons.logging.LogFactory;import com.sk.model.User;public class HttpJsonDemo {private static final Log log = LogFactory.getLog(HttpJsonDemo.class);public static String postHttp(String param1, String url) {String responseMsg = "";// 1.构造HttpClient的实例HttpClient httpClient = new HttpClient();httpClient.getParams().setContentCharset("utf-8");// 2.构造PostMethod的实例log.info("[请求地址："+url+"]");PostMethod postMethod = new PostMethod(url);postMethod.addParameter("parameters", param1);try {// 4.执行postMethod,调用http接口httpClient.executeMethod(postMethod);// 200// 5.读取内容responseMsg = postMethod.getResponseBodyAsString().trim();JSONObject jsonObjRes = JSONObject.fromObject(responseMsg);System.out.println(jsonObjRes);System.out.println(jsonObjRes.getString("id"));// 6.处理返回的内容} catch (HttpException e) {log.info("----登录出错!----");} catch (IOException e) {log.info("----登录出错!----");} finally {// 7.释放连接postMethod.releaseConnection();}return responseMsg;}public static void main(String[] args) {User user = new User();user.setName("sk");user.setPwd("111111");    JSONObject jsonObj = JSONObject.fromObject(user);//设置参数和urlpostHttp(jsonObj.toString(), "http://localhost:8080/HttpServerTest/jsonServlet");}}

3.新建服务端web 工程，新建JsonServlet类，如下：

package com;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import net.sf.json.JSONObject;public class JsonServlet extends HttpServlet { /** *  */private static final long serialVersionUID = 1L;public void doGet(HttpServletRequest request, HttpServletResponse response)              throws ServletException, IOException {          response.setCharacterEncoding("utf-8");  //设置HTTP 响应的编码        PrintWriter out = response.getWriter();          String param1 = request.getParameter("parameters");          JSONObject jsonObj = JSONObject.fromObject(param1);        String name = jsonObj.getString("name");        String pwd = jsonObj.getString("pwd");        if("sk".equals(name) && "111111".equals(pwd)){        Student stu = new Student(1, "张三", "666666");        JSONObject jsonObjOut = JSONObject.fromObject(stu);        out.println(jsonObjOut.toString());        //可以进行业务处理之后返回 TODO        }else{         out.println("参数param1不能为空");         }        out.close();      }        public void doPost(HttpServletRequest request, HttpServletResponse response)              throws ServletException, IOException {          this.doGet(request, response);      }  }

4.新建Student类，内容如下：

package com;public class Student {private int id;private String name;private String pwd;public Student() {}public Student(int id, String name, String pwd) {this.id = id;this.name = name;this.pwd = pwd;}public int getId() {return id;}public void setId(int id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public String getPwd() {return pwd;}public void setPwd(String pwd) {this.pwd = pwd;}}

5.web.xml中配置如下：

<?xml version="1.0" encoding="UTF-8"?><web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns="http://java.sun.com/xml/ns/javaee"xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"id="WebApp_ID" version="2.5"><display-name>HttpServerTest</display-name><welcome-file-list><welcome-file>index.html</welcome-file><welcome-file>index.htm</welcome-file><welcome-file>index.jsp</welcome-file><welcome-file>default.html</welcome-file><welcome-file>default.htm</welcome-file><welcome-file>default.jsp</welcome-file></welcome-file-list><!-- 发送xml的配置 --><servlet><servlet-name>GenXmlServlet</servlet-name><servlet-class>com.GenXmlServlet</servlet-class></servlet><servlet-mapping><servlet-name>GenXmlServlet</servlet-name><url-pattern>/GenXmlServlet</url-pattern></servlet-mapping><!-- 发送json的配置 --><servlet><servlet-name>jsonServlet</servlet-name><servlet-class>com.JsonServlet</servlet-class></servlet><servlet-mapping><servlet-name>jsonServlet</servlet-name><url-pattern>/jsonServlet</url-pattern></servlet-mapping></web-app>

6.运行客户端，控制台打印如下：

 

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