在项目中，经常会进行垮项目通讯，最常用的就是webservice接口，但是有时候在内部平台和平台间通讯，我们也会简单的使用springMVC 控制器暴露出接口地址，然后另一个项目发送http请求进行报文通讯等操作

首先写一个简单的MVC控制器

package com.lovo.controller;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.StringReader;
import java.net.URLDecoder;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.log4j.Logger;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

import com.test.Log4jTest;

@Controller
public class httpClientServer {

    Logger log=Logger.getLogger(httpClientServer.class);
    
    @RequestMapping(value="/htteTestServlet.do",method=RequestMethod.POST)
    public void doPostServer(HttpServletRequest request, HttpServletResponse response){

        try {
            //设置编码集
            response.setCharacterEncoding("UTF-8");
            request.setCharacterEncoding("UTF-8");
            
            //方法1 ，从消息体中取值
            //获取消息体内容
            BufferedReader reader = request.getReader();
            StringBuffer buffer = new StringBuffer();
            String temp = null;
            while((temp = reader.readLine()) != null){
                System.out.println(temp);
                buffer.append(temp);
            }
            //进行URL解码
            String rspTtr = URLDecoder.decode(buffer.toString(),"utf-8");
            //返回处理后的消息体
            response.getOutputStream().write(rspTtr.getBytes("UTF-8"));
            
            //方法2：因为封装到body，也可以直接用gerparameter取值
            //对请求的报文进行处理
/*          String xml = request.getParameter("xml");
            System.out.println("服务端"+xml);
            //响应客户端，返回报文
            response.getOutputStream().write(xml.getBytes("UTF-8"));*/
            
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}

写一个简单的httpclient发送post请求

package com.lovo.utils;

import java.io.IOException;

import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpException;
import org.apache.commons.httpclient.NameValuePair;
import org.apache.commons.httpclient.methods.PostMethod;
import org.apache.commons.httpclient.params.HttpMethodParams;

public class HttpClientUtils {
    
    public static String postHttp(String url,String body) {
        String mesg = null;
        //构建HttpClient实例
        HttpClient httpClient = new HttpClient();
        //设置请求超时时间
        httpClient.getHttpConnectionManager().getParams().setConnectionTimeout(60000);
        //设置响应超时时间
        httpClient.getHttpConnectionManager().getParams().setSoTimeout(60000);
        
        //构造PostMethod的实例
        PostMethod postMethod=new PostMethod(url);
        postMethod.getParams().setParameter(HttpMethodParams.HTTP_CONTENT_CHARSET,"utf-8");
        //封装消息体内容
        NameValuePair[] data = {new NameValuePair("xml",body)};
        postMethod.setRequestBody(data);
        
        try {
            //执行post请求
            httpClient.executeMethod(postMethod);
            //可以对响应回来的报文进行处理
            mesg = postMethod.getResponseBodyAsString();
            
        } catch (HttpException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }finally{
            //关闭连接释放资源的方法
            postMethod.releaseConnection();
            //((SimpleHttpConnectionManager)httpClient.getHttpConnectionManager()).shutdown();
            httpClient.getHttpConnectionManager().closeIdleConnections(0);
        }
        
        
        return mesg;
    }

    public static void main(String[] args) {
        
        String xml = "<?xml version='1.0' encoding='utf-8'?>"
                + "<shopping><product code='1'>"
                + "<name>老坛酸菜</name><"
                + "price>3.5</price>"
                + "<factory>统一</factory>"
                + "</product><product code='2'>"
                + "<name>加多宝</name>"
                + "<price>6</price>"
                + "<factory>加多宝</factory>"
                + "</product>"
                + "</shopping>";
        System.out.println(xml);
        String a  = postHttp("http://localhost:8080/Spring/htteTestServlet.do", xml);
        System.out.println("客户端"+a);
    }
}

这样就完成了一个简单的通讯