Android發送GET與POST請求的DEMO詳解

4.0後網絡訪問必須單獨起一個子線程訪問，否則無法運行，這裡有一個發送請求的工具類GetPostUtil
復制代碼 代碼如下:
public class GetPostUtil
{
 /**
  * 向指定URL發送GET方法的請求
  *
  * @param url
  *            發送請求的URL
  * @param params
  *            請求參數，請求參數應該是name1=value1&name2=value2的形式。
  * @return URL所代表遠程資源的響應
  */
 public static String sendGet(String url, String params)
 {
  String result = "";
  BufferedReader in = null;
  try
  {
   String urlName = url + "?" + params;
   URL realUrl = new URL(urlName);
   // 打開和URL之間的連接
   URLConnection conn = realUrl.openConnection();
   // 設置通用的請求屬性
   conn.setRequestProperty("accept", "*/*");
   conn.setRequestProperty("connection", "Keep-Alive");
   conn.setRequestProperty("user-agent",
    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)");
   // 建立實際的連接
   conn.connect();
   // 獲取所有響應頭字段
   Map<String, List<String>> map = conn.getHeaderFields();
   // 遍歷所有的響應頭字段
   for (String key : map.keySet())
   {
    System.out.println(key + "--->" + map.get(key));
   }
   // 定義BufferedReader輸入流來讀取URL的響應
   in = new BufferedReader(
    new InputStreamReader(conn.getInputStream()));
   String line;
   while ((line = in.readLine()) != null)
   {
    result += "\n" + line;
   }
  }
  catch (Exception e)
  {
   System.out.println("發送GET請求出現異常！" + e);
   e.printStackTrace();
  }
  // 使用finally塊來關閉輸入流
  finally
  {
   try
   {
    if (in != null)
    {
     in.close();
    }
   }
   catch (IOException ex)
   {
    ex.printStackTrace();
   }
  }
  return result;
 }
 /**
  * 向指定URL發送POST方法的請求
  *
  * @param url
  *            發送請求的URL
  * @param params
  *            請求參數，請求參數應該是name1=value1&name2=value2的形式。
  * @return URL所代表遠程資源的響應
  */
 public static String sendPost(String url, String params)
 {
  PrintWriter out = null;
  BufferedReader in = null;
  String result = "";
  try
  {
   URL realUrl = new URL(url);
   // 打開和URL之間的連接
   URLConnection conn = realUrl.openConnection();
   // 設置通用的請求屬性
   conn.setRequestProperty("accept", "*/*");
   conn.setRequestProperty("connection", "Keep-Alive");
   conn.setRequestProperty("user-agent",
    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)");
   // 發送POST請求必須設置如下兩行
   conn.setDoOutput(true);
   conn.setDoInput(true);
   // 獲取URLConnection對象對應的輸出流
   out = new PrintWriter(conn.getOutputStream());
   // 發送請求參數
   out.print(params);
   // flush輸出流的緩沖
   out.flush();
   // 定義BufferedReader輸入流來讀取URL的響應
   in = new BufferedReader(
    new InputStreamReader(conn.getInputStream()));
   String line;
   while ((line = in.readLine()) != null)
   {
    result += "\n" + line;
   }
  }
  catch (Exception e)
  {
   System.out.println("發送POST請求出現異常！" + e);
   e.printStackTrace();
  }
  // 使用finally塊來關閉輸出流、輸入流
  finally
  {
   try
   {
    if (out != null)
    {
     out.close();
    }
    if (in != null)
    {
     in.close();
    }
   }
   catch (IOException ex)
   {
    ex.printStackTrace();
   }
  }
  return result;
 }
}

Activity類代碼
復制代碼 代碼如下:
public class GetPostMain extends Activity
{
 Button get , post;
 EditText show;
 @Override
 public void onCreate(Bundle savedInstanceState)
 {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main);
  get = (Button) findViewById(R.id.get);
  post = (Button) findViewById(R.id.post);
  show = (EditText)findViewById(R.id.show);
  //利用Handler更新UI
  final Handler h = new Handler(){
   @Override
   public void handleMessage(Message msg) {
    if(msg.what==0x123){
     show.setText(msg.obj.toString());
    }
   }
  };

  get.setOnClickListener(new OnClickListener()
  {
   @Override
   public void onClick(View v)
   {
    new Thread(new AccessNetwork("GET", "http://192.168.1.88:8080/abc/a.jsp", null, h)).start();
   }   
  });
  post.setOnClickListener(new OnClickListener()
  {
   @Override
   public void onClick(View v)
   {
    new Thread(new AccessNetwork("POST", "http://192.168.1.88:8080/abc/login.jsp", "name=crazyit.org&pass=leegang", h)).start();
   }   
  }); 
 }
}
class AccessNetwork implements Runnable{
 private String op ;
 private String url;
 private String params;
 private Handler h;

 public AccessNetwork(String op, String url, String params,Handler h) {
  super();
  this.op = op;
  this.url = url;
  this.params = params;
  this.h = h;
 }
 @Override
 public void run() {
  Message m = new Message();
  m.what = 0x123;
  if(op.equals("GET")){
   Log.i("iiiiiii","發送GET請求");
   m.obj = GetPostUtil.sendGet(url, params);
   Log.i("iiiiiii",">>>>>>>>>>>>"+m.obj);
  }
  if(op.equals("POST")){
   Log.i("iiiiiii","發送POST請求");
   m.obj = GetPostUtil.sendPost(url, params);
   Log.i("gggggggg",">>>>>>>>>>>>"+m.obj);
  }
  h.sendMessage(m);
 }
}