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                [Android網絡編程之傳遞數據給服務器(二)](http://blog.csdn.net/fengyuzhengfan/article/details/39628543) 請尊重他人的勞動成果,轉載請注明出處:[Android網絡編程之傳遞數據給服務器(二)](http://blog.csdn.net/fengyuzhengfan/article/details/39628543) 我曾在《[Android網絡編程之傳遞數據給服務器(一)?](http://blog.csdn.net/fengyuzhengfan/article/details/39621469)》?一文中介紹了如何通過GET方式傳遞數據給服務器,通過GET方式傳遞數據主要適用于數據大小不超過2KB,且對安全性要求不高的情況下。下面就介紹通過POST方式傳遞數據主到服務器。 ## 一、通過Post方式傳遞數據給服務器 通過Post方式傳遞數據給服務器是Android應用程序開發提交數據給服務器的一種主要的方式,適用于數據量大、數據類型復雜、數據安全性高的場合。 ### 1.創建服務器端: 服務器端項目結構: ![通過Post方式傳遞數據給服務器——服務器端項目結構](https://box.kancloud.cn/2016-02-19_56c6aa38e9975.jpg) ### 第一步:創建控制器Servlet ~~~ package com.jph.sp.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 pwd= request.getParameter("pwd"); System.out.println("name from POST method: " + name ); System.out.println("pwd from POST method: " + pwd ); } } ~~~ 至此服務器端項目已經完成。下面開始創建Android端項目。 ### 2.創建Android端: Android端項目結構: ![通過Post方式傳遞數據給服務器——Android端項目結構](https://box.kancloud.cn/2016-02-19_56c6aa3906256.jpg) ### 第一步:創建Android端項目的業務邏輯層 核心代碼:SendDateToServer.java: ~~~ package com.jph.sp.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; import android.os.Handler; /** * 通過POST方式向服務器發送數據 * @author jph * Date:2014.09.27 */ public class SendDateToServer { private static String url="http://10.219.61.117:8080/ServerForPOSTMethod/ServletForPOSTMethod"; public static final int SEND_SUCCESS=0x123; public static final int SEND_FAIL=0x124; private Handler handler; public SendDateToServer(Handler handler) { // TODO Auto-generated constructor stub this.handler=handler; } /** * 通過POST方式向服務器發送數據 * @param name 用戶名 * @param pwd 密碼 */ public void SendDataToServer(String name,String pwd) { // TODO Auto-generated method stub final Map<String, String>map=new HashMap<String, String>(); map.put("name", name); map.put("pwd", pwd); new Thread(new Runnable() { @Override public void run() { // TODO Auto-generated method stub try { if (sendPostRequest(map,url,"utf-8")) { handler.sendEmptyMessage(SEND_SUCCESS);//通知主線程數據發送成功 }else { //將數據發送給服務器失敗 } } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } }).start(); } /** * 發送POST請求 * @param map 請求參數 * @param url 請求路徑 * @return * @throws Exception */ private boolean sendPostRequest(Map<String, String> param, String url,String encoding) throws Exception { // TODO Auto-generated method stub //http://10.219.61.117:8080/ServerForPOSTMethod/ServletForPOSTMethod?name=aa&pwd=124 StringBuffer sb=new StringBuffer(url); if (!url.equals("")&!param.isEmpty()) { sb.append("?"); for (Map.Entry<String, String>entry:param.entrySet()) { sb.append(entry.getKey()+"="); sb.append(URLEncoder.encode(entry.getValue(), encoding)); sb.append("&"); } sb.deleteCharAt(sb.length()-1);//刪除字符串最后 一個字符“&” } byte[]data=sb.toString().getBytes(); HttpURLConnection conn=(HttpURLConnection) new URL(url).openConnection(); conn.setConnectTimeout(5000); conn.setRequestMethod("POST");//設置請求方式為POST conn.setDoOutput(true);//允許對外傳輸數據 conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");// 設置窗體數據編碼為名稱/值對 conn.setRequestProperty("Content-Length", data.length+""); OutputStream outputStream=conn.getOutputStream();//打開服務器的輸入流 outputStream.write(data);//將數據寫入到服務器的輸出流 outputStream.flush(); if (conn.getResponseCode()==200) { return true; } return false; } } ~~~ ### 第三步:創建Activity ~~~ package com.jph.sp.activity; import com.jph.sp.service.SendDateToServer; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.app.Activity; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.EditText; import android.widget.Toast; /** * 通過Post方式傳遞數據給服務器是Android應用程序開發 * 提交數據給服務器的一種主要的方式,適用于數據量大、 * 數據類型復雜、數據安全性高的場合。 * @author jph * Date:2014.09.27 */ public class MainActivity extends Activity { private EditText edtName,edtPwd; private Button btnSend; Handler handler=new Handler(){ public void handleMessage(Message msg) { switch (msg.what) { case SendDateToServer.SEND_SUCCESS: Toast.makeText(MainActivity.this, "登陸成功", Toast.LENGTH_SHORT).show(); break; case SendDateToServer.SEND_FAIL: Toast.makeText(MainActivity.this, "登陸失敗", Toast.LENGTH_SHORT).show(); break; default: break; } }; }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); edtName=(EditText)findViewById(R.id.edtName); edtPwd=(EditText)findViewById(R.id.edtPwd); btnSend=(Button)findViewById(R.id.btnSend); btnSend.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub String name=edtName.getText().toString(); String pwd=edtPwd.getText().toString(); if (edtName.equals("")||edtPwd.equals("")) { Toast.makeText(MainActivity.this, "用戶名或密碼不能為空", Toast.LENGTH_LONG).show(); }else { new SendDateToServer(handler).SendDataToServer(name, pwd); } } }); } } ~~~ 至此Android端項目已經完成了。下面就讓我們看一下APP運行效果吧: Android運行效果圖: ![通過Post方式傳遞數據給服務器——運行效果圖](https://box.kancloud.cn/2016-02-19_56c6aa391736a.jpg) ![通過Post方式傳遞數據給服務器——運行效果圖](https://box.kancloud.cn/2016-02-19_56c6aa39290d1.gif)
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