Android POST GET請求

Android應用經常會和服務器端交互，這就需要手機客戶端發送網絡請求，下面介紹常用的兩種網絡請求方式POST，GET。首先要區別POST和GET請求
1. GET是從服務器上獲取數據，POST是向服務器傳送數據。
2. GET是把參數數據隊列加到提交表單的ACTION屬性所指的URL中，值和表單內各個字段一一對應，在URL中可以看到。POST是通過HTTP post機制，將表單內各個字段與其內容放置在HTML HEADER內一起傳送到ACTION屬性所指的URL地址。用戶看不到這個過程
3. GET方式提交的數據最多只能是1024字節，理論上POST沒有限制，可傳較大量的數據
4. GET安全性非常低，POST安全性較高。但是執行效率卻比POST方法好。

下面分別用Post和GET方法來實現Android應用的人員登入，首先我們搭建一個服務器，這裡我使用WAMP環境，使用ThinkPHP框架。詳細的服務器搭建就不說了。給出主要響應代碼：

2. namespace Home\Controller;
3. use Think\Controller;
4. class AndroidController extends Controller {
5. public function index()
6. {
7. //獲取賬號密碼
8. $id=I('username');
9. $pwd=I('password');
10. $User=M('user');
11. //查詢數據庫
12. $data = $User->where("NAME='$id' AND PASSWORD='$pwd' ")->find();
13. //登入成功
14. if($data)
15. {
16. $response = array('success' => true,'msg'=>'登入成功');
17.  
18. $response=json_encode($response);
19. echo $response;//返回json格式
20. }
21. //登入失敗
22. else
23. {
24. $response = array('success' => false,'msg'=>'賬號或密碼錯誤');
25. $response=json_encode($response);
26. echo $response;//返回json格式
27. }
28. }
29.  
30. } 復制代碼 記得添加網絡權限 Android的網絡請求主要使用java.net包中的HttpURLConnection類，服務器與Android客戶端數據交互格式為json 1.利用POST請求方式來實現人員登入。
    1. package com.dream.apm;
    2.  
    3. import android.app.Activity;
    4. import android.content.pm.ActivityInfo;
    5. import android.os.Bundle;
    6. import android.os.Handler;
    7. import android.os.Looper;
    8. import android.os.Message;
    9. import android.view.View;
    10. import android.view.Window;
    11. import android.view.WindowManager;
    12. import android.widget.Button;
    13. import android.widget.EditText;
    14. import android.widget.LinearLayout;
    15. import android.widget.Toast;
    16. import org.json.JSONArray;
    17. import org.json.JSONException;
    18. import org.json.JSONObject;
    19.  
    20. import java.io.*;
    21. import java.net.HttpURLConnection;
    22. import java.net.MalformedURLException;
    23. import java.net.URL;
    24. import java.net.URLEncoder;
    25.  
    26. public class MyActivity extends Activity {
    27.  
    28. //請求地址
    29. private static String url="http://10.0.2.2:8080/think/index.php/Home/Android";
    30. public Button start;
    31.  
    32. public EditText username,password;
    33.  
    34. public URL http_url;
    35.  
    36. public String data;
    37.  
    38. public Handler handler;
    39.  
    40. @Override
    41. public void onCreate(Bundle savedInstanceState){
    42. super.onCreate(savedInstanceState);
    43. //設置全屏
    44. getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
    45. WindowManager.LayoutParams.FLAG_FULLSCREEN);
    46. //去除應用程序標題
    47. this.requestWindowFeature(Window.FEATURE_NO_TITLE);
    48. //設置豎屏
    49. setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
    50. setContentView(R.layout.main);
    51.  
    52. start=(Button)findViewById(R.id.start_one);
    53. username=(EditText)findViewById(R.id.username);
    54. password=(EditText)findViewById(R.id.password);
    55. //消息處理器
    56.  
    57. handler=new Handler(Looper.getMainLooper())
    58. {
    59. @Override
    60. public void handleMessage(Message msg)
    61. {
    62. super.handleMessage(msg);
    63. switch(msg.what)
    64. {
    65. //登入成功
    66. case 1:
    67. Toast.makeText(MyActivity.this, msg.getData().getString("msg"),
    68. Toast.LENGTH_SHORT).show();
    69. break;
    70. //登入失敗
    71. case 2:
    72. Toast.makeText(MyActivity.this, msg.getData().getString("msg"),
    73. Toast.LENGTH_SHORT).show();
    74. break;
    75.  
    76. }
    77. }
    78. };
    79.  
    80. start.setOnClickListener(new View.OnClickListener() {
    81. @Override
    82. public void onClick(View v) {
    83. //是否輸入賬號密碼
    84. if(username.getText().toString().length()>0&&password.getText().toString().length()>0){
    85. //子線程可以獲取UI的值，不能更改
    86. new Thread(new Runnable() {
    87. @Override
    88. public void run() {
    89. try {
    90. http_url=new URL(url);
    91. if(http_url!=null)
    92. {
    93. //打開一個HttpURLConnection連接
    94. HttpURLConnection conn = (HttpURLConnection) http_url.openConnection();
    95. conn.setConnectTimeout(5* 1000);//設置連接超時
    96. conn.setRequestMethod("POST");//以get方式發起請求
    97. //允許輸入輸出流
    98. conn.setDoInput(true);
    99. conn.setDoOutput(true);
    100. conn.setUseCaches(false);//使用Post方式不能使用緩存
    101. //獲取賬號密碼
    102. String params = "username=" + username.getText().toString()
    103. + "&password=" + password.getText().toString();
    104. //設置請求體的類型是文本類型
    105. conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
    106. //設置請求體的長度--字節長度
    107. conn.setRequestProperty("Content-Length",String.valueOf(params.getBytes().length) );
    108. //發送post參數
    109. BufferedWriter bw=new BufferedWriter(new OutputStreamWriter(conn.getOutputStream()));
    110. bw.write(params);
    111. bw.close();
    112. //接收服務器響應
    113. if (conn.getResponseCode() == 200) {
    114. InputStream is = conn.getInputStream();//得到網絡返回的輸入流
    115. BufferedReader buf=new BufferedReader(new InputStreamReader(is));//轉化為字符緩沖流
    116. data=buf.readLine();
    117. buf.close();is.close();
    118. //判斷登入結果
    119. analyse(data);
    120. }
    121. }
    122. } catch( Exception e) {
    123. e.printStackTrace();
    124. }
    125. }
    126. }).start();
    127. }
    128. else
    129. {
    130. Toast.makeText(MyActivity.this, "請完整輸入賬號密碼",
    131. Toast.LENGTH_SHORT).show();
    132. }
    133. }
    134. });
    135. }
    136.  
    137. public void analyse (String data)
    138. {
    139. System.out.println(data);
    140. try {
    141. JSONObject json_data=new JSONObject(data);
    142. Boolean state=json_data.getBoolean("success");
    143. String msg=json_data.getString("msg");
    144. //登入成功
    145. if(state)
    146. {
    147. //發送消息
    148. Message message= new Message();
    149. message.what=1;
    150. Bundle temp = new Bundle();
    151. temp.putString("msg",msg);
    152. message.setData(temp);
    153. handler.sendMessage(message);
    154.  
    155. }
    156. //登入失敗
    157. else
    158. {
    159. Message message= new Message();
    160. message.what=2;
    161. Bundle temp = new Bundle();
    162. temp.putString("msg",msg);
    163. message.setData(temp);
    164. handler.sendMessage(message);
    165. }
    166. } catch (JSONException e) {
    167. e.printStackTrace();
    168. }
    169. }
    170. } 復制代碼 2.利用GET請求方式來實現人員登入
         1. package com.dream.apm;
         2.  
         3. import android.app.Activity;
         4. import android.content.pm.ActivityInfo;
         5. import android.os.Bundle;
         6. import android.os.Handler;
         7. import android.os.Looper;
         8. import android.os.Message;
         9. import android.view.View;
         10. import android.view.Window;
         11. import android.view.WindowManager;
         12. import android.widget.Button;
         13. import android.widget.EditText;
         14. import android.widget.LinearLayout;
         15. import android.widget.Toast;
         16. import org.json.JSONArray;
         17. import org.json.JSONException;
         18. import org.json.JSONObject;
         19.  
         20. import java.io.*;
         21. import java.net.HttpURLConnection;
         22. import java.net.MalformedURLException;
         23. import java.net.URL;
         24. import java.net.URLEncoder;
         25.  
         26. public class MyActivity extends Activity {
         27.  
         28. public Button start;
         29.  
         30. public EditText username,password;
         31.  
         32. public URL http_url;
         33.  
         34. public String data;
         35.  
         36. public Handler handler;
         37.  
         38. @Override
         39. public void onCreate(Bundle savedInstanceState){
         40. super.onCreate(savedInstanceState);
         41. //設置全屏
         42. getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
         43. WindowManager.LayoutParams.FLAG_FULLSCREEN);
         44. //去除應用程序標題
         45. this.requestWindowFeature(Window.FEATURE_NO_TITLE);
         46. //設置豎屏
         47. setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
         48. setContentView(R.layout.main);
         49.  
         50. start=(Button)findViewById(R.id.start_one);
         51. username=(EditText)findViewById(R.id.username);
         52. password=(EditText)findViewById(R.id.password);
         53. //消息處理器
         54.  
         55. handler=new Handler(Looper.getMainLooper())
         56. {
         57. @Override
         58. public void handleMessage(Message msg)
         59. {
         60. super.handleMessage(msg);
         61. switch(msg.what)
         62. {
         63. //登入成功
         64. case 1:
         65. Toast.makeText(MyActivity.this, msg.getData().getString("msg"),
         66. Toast.LENGTH_SHORT).show();
         67. break;
         68. //登入失敗
         69. case 2:
         70. Toast.makeText(MyActivity.this, msg.getData().getString("msg"),
         71. Toast.LENGTH_SHORT).show();
         72. break;
         73.  
         74. }
         75. }
         76. };
         77.  
         78. start.setOnClickListener(new View.OnClickListener() {
         79. @Override
         80. public void onClick(View v) {
         81. //是否輸入賬號密碼
         82. if(username.getText().toString().length()>0&&password.getText().toString().length()>0){
         83. //子線程可以獲取UI的值，不能更改
         84. new Thread(new Runnable() {
         85. @Override
         86. public void run() {
         87. try {
         88. //請求地址--
         89. String url="http://10.0.2.2:8080/think/index.php/Home/Android?"+ "username=" + URLEncoder.encode(username.getText().toString(), "UTF-8")
         90. + "&password=" + URLEncoder.encode(password.getText().toString(), "UTF-8");
         91. http_url=new URL(url);
         92. if(http_url!=null)
         93. {
         94. //打開一個HttpURLConnection連接
         95. HttpURLConnection conn = (HttpURLConnection) http_url.openConnection();
         96. conn.setConnectTimeout(5* 1000);//設置連接超時
         97. conn.setRequestMethod("GET");//以get方式發起請求
         98. //允許輸入流
         99. conn.setDoInput(true);
         100. //接收服務器響應
         101. if (conn.getResponseCode() == 200) {
         102. InputStream is = conn.getInputStream();//得到網絡返回的輸入流
         103. BufferedReader buf=new BufferedReader(new InputStreamReader(is));//轉化為字符緩沖流
         104. data=buf.readLine();
         105. buf.close();is.close();
         106. //判斷登入結果
         107. analyse(data);
         108. }
         109. }
         110. } catch( Exception e) {
         111. e.printStackTrace();
         112. }
         113. }
         114. }).start();
         115. }
         116. else
         117. {
         118. Toast.makeText(MyActivity.this, "請完整輸入賬號密碼",
         119. Toast.LENGTH_SHORT).show();
         120. }
         121. }
         122. });
         123. }
         124.  
         125. public void analyse (String data)
         126. {
         127. System.out.println(data);
         128. try {
         129. JSONObject json_data=new JSONObject(data);
         130. Boolean state=json_data.getBoolean("success");
         131. String msg=json_data.getString("msg");
         132. //登入成功
         133. if(state)
         134. {
         135. //發送消息
         136. Message message= new Message();
         137. message.what=1;
         138. Bundle temp = new Bundle();
         139. temp.putString("msg",msg);
         140. message.setData(temp);
         141. handler.sendMessage(message);
         142.  
         143. }
         144. //登入失敗
         145. else
         146. {
         147. Message message= new Message();
         148. message.what=2;
         149. Bundle temp = new Bundle();
         150. temp.putString("msg",msg);
         151. message.setData(temp);
         152. handler.sendMessage(message);
         153. }
         154. } catch (JSONException e) {
         155. e.printStackTrace();
         156. }
         157. }
         158. } 復制代碼 運行結果：