Android通过POST方式传递数据到服务器简单demo

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通过Post方式传递数据给服务器是Android应用程序中的开发提交数据给服务器的一种主要方式，适用于数据量大、数据类型复杂、数据安全要求比较高的场合。
服务器端代码，该处主要编写doGet方法既可：

package com.wangjialin.internet.servlet;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;@WebServlet("/ServletForPOSTMethod")public class ServletForPOSTMethod extends HttpServlet {    private static final long serialVersionUID = 1L;    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {        // TODO Auto-generated method stub    }    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {        String name= request.getParameter("name");        String age= request.getParameter("age");        System.out.println("name from POST method: " + name );        System.out.println("age from POST method: " + age );    }}

客户端代码：
业务逻辑代码：

package com.wangjialin.internet.userInformation.service;import java.io.OutputStream;import java.net.HttpURLConnection;import java.net.URL;import java.net.URLEncoder;import java.util.HashMap;import java.util.Map;public class UploadUserInformationByPostService {    public static boolean save(String title, String length) throws Exception{        String path = "http://192.168.1.100:8080/ServerForPOSTMethod/ServletForPOSTMethod";        Map<String, String> params = new HashMap<String, String>();        params.put("name", title);        params.put("age", length);        return sendPOSTRequest(path, params, "UTF-8");    }    /**     * 发送POST请求     * @param path 请求路径     * @param params 请求参数     * @return     */    private static boolean sendPOSTRequest(String path, Map<String, String> params, String encoding) throws Exception{        //  title=liming&length=30        StringBuilder sb = new StringBuilder();        if(params!=null && !params.isEmpty()){            for(Map.Entry<String, String> entry : params.entrySet()){                sb.append(entry.getKey()).append("=");                sb.append(URLEncoder.encode(entry.getValue(), encoding));                sb.append("&");            }            sb.deleteCharAt(sb.length() - 1);        }        byte[] data = sb.toString().getBytes();        HttpURLConnection conn = (HttpURLConnection) new URL(path).openConnection();        conn.setConnectTimeout(5000);        conn.setRequestMethod("POST");        conn.setDoOutput(true);//允许对外传输数据        conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");        conn.setRequestProperty("Content-Length", data.length+"");        OutputStream outStream = conn.getOutputStream();        outStream.write(data);        outStream.flush();        if(conn.getResponseCode() == 200){            return true;        }        return false;    }}

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