Android发送GET与POST请求的DEMO详解

4.0后网络访问必须单独起一个子线程访问，否则无法运行，这里有一个发送请求的工具类GetPostUtil


代码如下:

public class GetPostUtil
{
 /**
  * 向指定URL发送GET方法的请求
  *
  * @param url
  *            发送请求的URL
  * @param params
  *            请求参数，请求参数应该是name1=value1&name2=value2的形式。
  * @return URL所代表远程资源的响应
  */
 public static String sendGet(String url, String params)
 {
  String result = "";
  BufferedReader in = null;
  try
  {
   String urlName = url + "?" + params;
   URL realUrl = new URL(urlName);
   // 打开和URL之间的连接
   URLConnection conn = realUrl.openConnection();
   // 设置通用的请求属性
   conn.setRequestProperty("accept", "*/*");
   conn.setRequestProperty("connection", "Keep-Alive");
   conn.setRequestProperty("user-agent",
    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)");
   // 建立实际的连接
   conn.connect();
   // 获取所有响应头字段
   Map<String, List<String>> map = conn.getHeaderFields();
   // 遍历所有的响应头字段
   for (String key : map.keySet())
   {
    System.out.println(key + "--->" + map.get(key));
   }
   // 定义BufferedReader输入流来读取URL的响应
   in = new BufferedReader(
    new InputStreamReader(conn.getInputStream()));
   String line;
   while ((line = in.readLine()) != null)
   {
    result += "\n" + line;
   }
  }
  catch (Exception e)
  {
   System.out.println("发送GET请求出现异常！" + e);
   e.printStackTrace();
  }
  // 使用finally块来关闭输入流
  finally
  {
   try
   {
    if (in != null)
    {
     in.close();
    }
   }
   catch (IOException ex)
   {
    ex.printStackTrace();
   }
  }
  return result;
 }
 /**
  * 向指定URL发送POST方法的请求
  *
  * @param url
  *            发送请求的URL
  * @param params
  *            请求参数，请求参数应该是name1=value1&name2=value2的形式。
  * @return URL所代表远程资源的响应
  */
 public static String sendPost(String url, String params)
 {
  PrintWriter out = null;
  BufferedReader in = null;
  String result = "";
  try
  {
   URL realUrl = new URL(url);
   // 打开和URL之间的连接
   URLConnection conn = realUrl.openConnection();
   // 设置通用的请求属性
   conn.setRequestProperty("accept", "*/*");
   conn.setRequestProperty("connection", "Keep-Alive");
   conn.setRequestProperty("user-agent",
    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)");
   // 发送POST请求必须设置如下两行
   conn.setDoOutput(true);
   conn.setDoInput(true);
   // 获取URLConnection对象对应的输出流
   out = new PrintWriter(conn.getOutputStream());
   // 发送请求参数
   out.print(params);
   // flush输出流的缓冲
   out.flush();
   // 定义BufferedReader输入流来读取URL的响应
   in = new BufferedReader(
    new InputStreamReader(conn.getInputStream()));
   String line;
   while ((line = in.readLine()) != null)
   {
    result += "\n" + line;
   }
  }
  catch (Exception e)
  {
   System.out.println("发送POST请求出现异常！" + e);
   e.printStackTrace();
  }
  // 使用finally块来关闭输出流、输入流
  finally
  {
   try
   {
    if (out != null)
    {
     out.close();
    }
    if (in != null)
    {
     in.close();
    }
   }
   catch (IOException ex)
   {
    ex.printStackTrace();
   }
  }
  return result;
 }
}

Activity类代码


代码如下:

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","发送GET请求");
   m.obj = GetPostUtil.sendGet(url, params);
   Log.i("iiiiiii",">>>>>>>>>>>>"+m.obj);
  }
  if(op.equals("POST")){
   Log.i("iiiiiii","发送POST请求");
   m.obj = GetPostUtil.sendPost(url, params);
   Log.i("gggggggg",">>>>>>>>>>>>"+m.obj);
  }
  h.sendMessage(m);
 }
}