通过POST方式传递数据给服务器

1.新建动态web工程（ServerPOST）

2.新建servlet。设置如下：

3.ServerPOST.java

package com.example.servletPOST;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/** * Servlet implementation class ServerPOST */
@WebServlet("/ServerPOST")
public class ServerPOST extends HttpServlet {
    private static final long serialVersionUID = 1L;

    /** * @see HttpServlet#HttpServlet() */
    public ServerPOST() {
        super();
    }

    /** * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse * response) */
    protected void doGet(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException {
// String name = request.getParameter("name");
// String age = request.getParameter("age");
// System.out.println("POST : " + name + " " + age);
    }

    /** * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse * response) */
    protected void doPost(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException {
            //这次是POST请求
        String name = request.getParameter("name");
        String age = request.getParameter("age");
        System.out.println("POST : " + name + " " + age);
    }
}

4.测试效果

5.建立客户端程序（UserInformationPOST）
布局文件，MainActivity.java和上一篇（http://blog.csdn.net/lxj1137800599/article/details/51077569）完全一样
UploadUserInfoService.java

package com.example.userinformationpost;

import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;

public class UploadUserInfoService {
    public static boolean save(String name, String age) throws Exception {
        String path = "http://10.107.56.64:8080/ServerPOST/ServerPOST";
        Map<String, String> params = new HashMap<String, String>();
        params.put("name", name);
        params.put("age", age);
        return sendPOSTRequest(path, params, "UTF-8");
    }

    private static boolean sendPOSTRequest(String path,
            Map<String, String> params, String encoding) throws Exception {

        StringBuilder sb = new StringBuilder(path);
        if (params != null && !params.isEmpty()) {
            sb.append("?");
            for (Entry<String, String> entry : params.entrySet()) {
                sb.append(entry.getKey()).append("=");
                sb.append(URLEncoder.encode(entry.getValue(), encoding))
                        .append("&");
            }
            sb.deleteCharAt(sb.length() - 1);
        }
        byte[] data = sb.toString().getBytes();
        // 上面的sb用来构造url
        HttpURLConnection connection = (HttpURLConnection) new URL(
                sb.toString()).openConnection();
        connection.setConnectTimeout(5000);

        //***************
        connection.setRequestMethod("POST");
        connection.setDoOutput(true);//如果设置POST，必须设置可以对外输出数据
        connection.setRequestProperty("Content-Type",
                "application/x-www-form-urlencoded");
        connection.setRequestProperty("Content-Length", data.length+"");
        OutputStream outputStream = connection.getOutputStream();
        outputStream.write(data);
        outputStream.flush();
        //*************
        //GET和POST就这里不一样

        if (connection.getResponseCode() == 200) {
            return true;
        }
        return false;
    }
}

6.测试结果