Android入門：發送HTTP的GET和POST請求

標籤：

HTTP的請求詳解在我的部落格中已經講解過：

http://blog.csdn.net/xiazdong/article/details/7215296

 

我在http://blog.csdn.net/xiazdong/article/details/7725867 中已經封裝了一個HTTP請求的輔助類，因此可以很簡單的發送GET、POST請求；

如HttpRequestUtil.sendGetRequest();是發送GET請求；

 

 

一、核心代碼  

HTTP GET 核心代碼：

 

(1)String value = URLEncoder.encode(String value,"UTF-8");

(2)String path = "http://../path?key="+value;

(3)URL url = new URL(path);//此處的URL需要進行URL編碼；

(4)HttpURLConnection con = (HttpURLConnection)url.openConnection();

(5)con.setRequestMethod("GET");

(6)con.setDoOutput(true);

(7)OutputStream out = con.getOutputStream();

(8)out.write(byte[]buf);

(9)int code = con.getResponseCode();

 

HTTP POST 核心代碼：

 

 

(1)String value = URLEncoder.encode(String value,"UTF-8");

(2)byte[]buf = ("key="+value).getBytes("UTF-8");

(3)String path = "http://../path";

(4)URL url = new URL(path);//此處的URL需要進行URL編碼；

(5)HttpURLConnection con = (HttpURLConnection)url.openConnection();

(6)con.setRequestMethod("POST");

(7)con.setDoOutput(true);

(8)OutputStream out = con.getOutputStream();

(9)out.write(byte[]buf);

(10)int code = con.getResponseCode();

 

 

二、GET和POST亂碼解決方式

 

GET：  

在doGet中加入：

 

String name = new String(request.getParameter("name").getBytes("ISO-8859-1"),"UTF-8");

 

POST：  

在doPost中加入：

 

request.setCharacterEncoding("UTF-8");

 

詳情請看我的博文：

http://blog.csdn.net/xiazdong/article/details/7217022

 

三、伺服器端代碼  

 

[java] view plain copy 

1. package org.xiazdong.servlet;  
2.   
3. import java.io.IOException;  
4. import javax.servlet.ServletException;  
5. import javax.servlet.annotation.WebServlet;  
6. import javax.servlet.http.HttpServlet;  
7. import javax.servlet.http.HttpServletRequest;  
8. import javax.servlet.http.HttpServletResponse;  
9.   
10. @WebServlet("/PrintServlet")  
11. public class PrintServlet extends HttpServlet {  
12.   
13.     protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {  
14.         String name = new String(request.getParameter("name").getBytes("ISO-8859-1"),"UTF-8");  
15.         String age = new String(request.getParameter("age").getBytes("ISO-8859-1"),"UTF-8");  
16.         System.out.println("姓名:"+name+"\n年齡："+age);  
17.     }  
18.   
19.     protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {  
20.         request.setCharacterEncoding("UTF-8");  
21.         System.out.println("姓名:"+request.getParameter("name")+"\n年齡："+request.getParameter("age"));  
22.     }  
23. }  

 

 

四、Android端代碼

 

在AndroidManifest.xml加入：

 

[html] view plain copy 

1. <uses-permission android:name="android.permission.INTERNET"/>  

MainActivity.java

 

 

[java] view plain copy 

1. package org.xiazdong.network.submit;  
2.   
3. import java.io.OutputStream;  
4. import java.net.HttpURLConnection;  
5. import java.net.URL;  
6. import java.net.URLEncoder;  
7.   
8. import android.app.Activity;  
9. import android.os.Bundle;  
10. import android.view.View;  
11. import android.view.View.OnClickListener;  
12. import android.widget.Button;  
13. import android.widget.EditText;  
14. import android.widget.Toast;  
15.   
16. public class MainActivity extends Activity {  
17.     private EditText name, age;  
18.     private Button getbutton, postbutton;  
19.     private OnClickListener listener = new OnClickListener() {  
20.         @Override  
21.         public void onClick(View v) {  
22.             try{  
23.                 if (getbutton == v) {  
24.                     /* 
25.                      * 因為是GET請求，所以需要將請求參數添加到URL後，並且還需要進行URL編碼 
26.                      * URL = http://192.168.0.103:8080/Server/PrintServlet?name=%E6%88%91&age=20 
27.                      * 此處需要進行URL編碼因為瀏覽器提交時自動進行URL編碼 
28.                      * */  
29.                     StringBuilder buf = new StringBuilder("http://192.168.0.103:8080/Server/PrintServlet");  
30.                     buf.append("?");  
31.                     buf.append("name="+URLEncoder.encode(name.getText().toString(),"UTF-8")+"&");  
32.                     buf.append("age="+URLEncoder.encode(age.getText().toString(),"UTF-8"));  
33.                     URL url = new URL(buf.toString());  
34.                     HttpURLConnection conn = (HttpURLConnection)url.openConnection();  
35.                     conn.setRequestMethod("GET");  
36.                     if(conn.getResponseCode()==200){  
37.                         Toast.makeText(MainActivity.this, "GET提交成功", Toast.LENGTH_SHORT).show();  
38.                     }  
39.                     else Toast.makeText(MainActivity.this, "GET提交失敗", Toast.LENGTH_SHORT).show();  
40.                 }  
41.                 if (postbutton == v) {  
42.                     /* 
43.                      * 如果是POST請求，則請求參數放在請求體中， 
44.                      * name=%E6%88%91&age=12 
45.                      *  
46.                      * */  
47.                     StringBuilder buf = new StringBuilder();  
48.                     buf.append("name="+URLEncoder.encode(name.getText().toString(),"UTF-8")+"&");  
49.                     buf.append("age="+URLEncoder.encode(age.getText().toString(),"UTF-8"));  
50.                     byte[]data = buf.toString().getBytes("UTF-8");  
51.                     URL url = new URL("http://192.168.0.103:8080/Server/PrintServlet");  
52.                     HttpURLConnection conn = (HttpURLConnection)url.openConnection();  
53.                     conn.setRequestMethod("POST");  
54.                     conn.setDoOutput(true); //如果要輸出，則必須加上此句  
55.                     OutputStream out = conn.getOutputStream();  
56.                     out.write(data);  
57.                     if(conn.getResponseCode()==200){  
58.                         Toast.makeText(MainActivity.this, "GET提交成功", Toast.LENGTH_SHORT).show();  
59.                     }  
60.                     else Toast.makeText(MainActivity.this, "GET提交失敗", Toast.LENGTH_SHORT).show();  
61.                 }  
62.             }  
63.             catch(Exception e){  
64.                   
65.             }  
66.         }  
67.     };  
68.   
69.     @Override  
70.     public void onCreate(Bundle savedInstanceState) {  
71.         super.onCreate(savedInstanceState);  
72.         setContentView(R.layout.main);  
73.         name = (EditText) this.findViewById(R.id.name);  
74.         age = (EditText) this.findViewById(R.id.age);  
75.         getbutton = (Button) this.findViewById(R.id.getbutton);  
76.         postbutton = (Button) this.findViewById(R.id.postbutton);  
77.         getbutton.setOnClickListener(listener);  
78.         postbutton.setOnClickListener(listener);  
79.     }  
80. }  

Android入門：發送HTTP的GET和POST請求