java http post/get 服务端和客户端实现json传输

注：本文来源于《java http post/get 服务端和客户端实现json传输》

最近需要写http post接口所以学习下。

总的还是不难直接上源码！

PostHttpClient.java 客户端
import java.io.IOException;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpException;
import org.apache.commons.httpclient.HttpStatus;
import org.apache.commons.httpclient.methods.ByteArrayRequestEntity;
import org.apache.commons.httpclient.methods.EntityEnclosingMethod;
import org.apache.commons.httpclient.methods.PostMethod;
import org.apache.commons.httpclient.methods.RequestEntity;


/**
 * ********************************************************
 *  采用httpclient插件的post方式发送流二进制流数据到HTTP服务端
 **********************************************************
 * ---@author [zt_zoro1272@163.com    ]
 **********************************************************
 * ---@version
 **********************************************************
 * ---@since 2014-8-28
 */
public class PostHttpClient {


    /**
     * ********************************************************
     * ---功能描述：         发送post请求,客户端采用二进制流发送,服务端采用二进制流介绍
     **********************************************************
     * ---@param json    入参的json格式的报文
     * ---@param url     http服务器的地址
     * ---@return       返回响应信息
     **********************************************************
     * ---@author  [zt_zoro1272@163.com    ]
     **********************************************************
     * ---@since 2014-8-28
     **********************************************************
     * ---@update:[变更日期YYYY-MM-DD][更改人姓名][变更描述]
     **********************************************************
     *
     */
    public static String postHttpReq(String json,String url) {
        HttpClient httpClient = new HttpClient();

        byte b[] = json.getBytes();//把字符串转换为二进制数据
        RequestEntity requestEntity = new ByteArrayRequestEntity(b);

        EntityEnclosingMethod postMethod = new PostMethod();
        postMethod.setRequestEntity(requestEntity);// 设置数据
        postMethod.setPath(url);// 设置服务的url
        postMethod.setRequestHeader("Content-Type", "text/html;charset=GBK");// 设置请求头编码

        // 设置连接超时
        httpClient.getHttpConnectionManager().getParams().setConnectionTimeout(
                5 * 1000);
        // 设置读取超时
        httpClient.getHttpConnectionManager().getParams().setSoTimeout(20 * 1000);

        String responseMsg = "";
        int statusCode = 0;
        try {
            statusCode = httpClient.executeMethod(postMethod);// 发送请求
            responseMsg = postMethod.getResponseBodyAsString();// 获取返回值
        } catch (HttpException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            postMethod.releaseConnection();// 释放连接
        }

        if (statusCode != HttpStatus.SC_OK) {
            System.out.println("HTTP服务异常" + statusCode);
        }
        return responseMsg;
    }

    //POST方式发送HTTP请求
    public static void main(String[] args) {
        String json = "{"PubInfo": {"clinet": "10.70.128.132","company": "月月鸟0820"},"Request": {"strBillId": "18221075148","strCcsOpId": "1234"}}";
        String url = "http://localhost:8080/httl_online/postHttpServer";
        String outPackage = null;
        outPackage = postHttpReq(json, url);
        System.out.println("客户端日志----POST方式调用HTTP,请求报文为:" + json);
        System.out
                .println("
author<pantp>===========客户端日志----POST方式调用HTTP服务,HTTP服务端响应报文如下:=============
");

        System.out.println(outPackage);

        System.out
                .println("
author<pantp>================================================================
");
    }

}

PostHttpServer.java 服务端
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.security.Principal;
import java.util.Arrays;
import java.util.Collections;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Locale;
import java.util.Map;

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.ServletInputStream;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;


/**
 * ********************************************************
 * 模拟的一个Http服务,处理客户端的post请求
 **********************************************************
 * ---@author [zt_zoro1272@163.com    ]
 **********************************************************
 * ---@version
 **********************************************************
 * ---@since 2014-8-28
 */
public class PostHttpServer extends HttpServlet {

    private static final long serialVersionUID = 1L;

    /*
     * 代码逻辑分以下三部分:
     * 1.获得请求报文
     * 2.根据请求报文的信息去做业务逻辑，然后封装返回报文
     * 3.输出相应报文
     */
    protected void doPost(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException {
        String inJson = null;// 保存HTTP客户端请求报文
        String outJson = null;// 保存HTTP服务端输出报文

        // 获得输人报文然后打印出来
        inJson = getInJson(request);
        System.out
                .println("
author<pantp>===========服务端日志----POST方式接收HTTP请求,HTTP服务端收到的请求报文如下:==========
");
        System.out.println(inJson);
        System.out
                .println("
author<pantp>=================================================================
");

        // 以下代码部分获得请求报文,然后去做校验,转换以及其他的调用其他的业务逻辑等,这里就不管它
        // ........................................................................

        // 下面部分是输出部分的处理
        outJson = "{"Response": {"code": "0","message": "成功","data": "12345"}}";// 输出不部分也以JSON格式的字符串输出,这里我就写死

        response.setContentType("application/json; charset=UTF-8");
        response.getWriter().print(outJson);
    }

    // 获得请求的报文,并作简单的校验
    public String getInJson(HttpServletRequest request) throws IOException {

        byte buffer[] = new byte[64 * 1024];
        InputStream in = request.getInputStream();// 获取输入流对象

        int len = in.read(buffer);
        // 必须对数组长度进行判断，否则在new byte[len]会报NegativeArraySizeException异常
        if (len < 0) {
            throw new IOException("请求报文为空");
        }

        String encode = request.getCharacterEncoding();// 获取请求头编码
        // 必须对编码进行校验,否则在new String(data, encode);会报空指针异常
        if (null == encode || encode.trim().length() < 0) {
            throw new IOException("请求报文未指明请求编码");
        }

        byte data[] = new byte[len];

        // 把buffer数组的值复制到data数组
        System.arraycopy(buffer, 0, data, 0, len);

        // 通过使用指定的 charset 解码指定的 byte 数组，构造一个新的 String
        String inJson = new String(data, encode);

        return inJson;
    }

    // 不提供get的处理方式
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
         String inJson = null;// 保存HTTP客户端请求报文
         String outJson = null;// 保存HTTP服务端输出报文

         // 获得输人报文然后打印出来
         inJson = getInJson(request);
         System.out
                 .println("
author<pantp>===========服务端日志----POST方式接收HTTP请求,HTTP服务端收到的请求报文如下:==========
");
         System.out.println(inJson);
         System.out
                 .println("
author<pantp>=================================================================
");

         // 以下代码部分获得请求报文,然后去做校验,转换以及其他的调用其他的业务逻辑等,这里就不管它
         // ........................................................................

         // 下面部分是输出部分的处理
         outJson = "{"Response": {"code": "0","message": "成功","data": "12345"}}";// 输出不部分也以JSON格式的字符串输出,这里我就写死

         response.setContentType("application/json; charset=UTF-8");
         response.getWriter().print(outJson);
    }


}

web.xml配置

<!-- 模拟HTTP的调用，写的一个只处理POST请求的http服务 -->
    <servlet>
        <servlet-name>PostHttpServer</servlet-name>
        <servlet-class>com.sitechasia.xinnet.online.util.cloudhttp.PostHttpServer</servlet-class>
    </servlet>

    <servlet-mapping>
        <servlet-name>PostHttpServer</servlet-name>
        <url-pattern>/postHttpServer</url-pattern>
    </servlet-mapping>