Android Http get post请求

Android Http get post请求

 

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表单提交中get和 post方式的区别有5点：
1.get是从服务器上获取数据，post是向服务器传送数据。
2.get是把参数数据队列加到提交表单的 ACTION属性所指的URL中，值和表单内各个字段一一对应，在URL中可以看到。post是通过HTTPpost机制，将表单内各个字段与其内容放置在HTML HEADER内一起传送到ACTION属性所指的URL地址。用户看不到这个过程。
3.对于get方式，服务器端用 Request.QueryString获取变量的值，对于post方式，服务器端用Request.Form获取提交的数据。
4.get 传送的数据量较小，不能大于2KB。post传送的数据量较大，一般被默认为不受限制。但理论上，IIS4中最大量为80KB，IIS5中为100KB。
5.get安全性非常低，post安全性较高。

一、HttpClinet方式

1、HTTP GET 示例:

 

public class TestHttpGetMethod{  

     public void get(){  

         BufferedReader in = null;  

         try{  

             HttpClient client = new DefaultHttpClient();  

             HttpGet request = new HttpGet();  

             request.setURI("http://w26.javaeye.com");  

             HttpResponse response = client.execute(request);   

             in = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));    

             StringBuffer sb = new StringBuffer("");   

             String line = "";  

             String NL = System.getProperty("line.separator");  

             while((line = in.readLine()) != null){  

                 sb.append(line + NL); 

 

             }  

             in.close();  

             String page = sb.toString();  

             Log.i(TAG, page);  

         }catch(Exception e){  

             Log.e(TAG,e.toString())  

         }finally{  

             if(in != null){  

                 try{  

                     in.close();  

                 }catch(IOException ioe){  

                     Log.e(TAG, ioe.toString());  

                 }  

             }  

         }  

     }  

 }

 

带参数的 HTTP GET: 
HttpGet request = new HttpGet("http://www.baidu.com/s?wd=amos_tl");  
client.execute(request);

2、HTTP POST 示例:

 

public class TestHttpPostMethod{  

     public void post(){  

         BufferedReader in = null;  

         try{  

             HttpClient client = new DefaultHttpClient();  

             HttpPost request = new HttpPost("http://localhost/upload.jsp");   

             List<NameValuePair> postParams = new ArrayList<NameValuePair>();  

             postParams.add(new BasicNameValuePair("filename", "sex.mov"));  

             UrlEncodeFormEntity formEntity = new UrlEncodeFormEntity(postParams);  

             request.setEntity(formEntity);  

             HttpResponse response = client.execute(request);  

             in = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));    

             StringBuffer sb = new StringBuffer("");   

             String line = "";  

             String NL = System.getProperty("line.separator");  

             while((line = in.readLine()) != null){  

                 sb.append(line + NL);  

             }  

             in.close();  

             String result = sb.toString();  

             Log.i(TAG, result );  

         }catch(Exception e){  

             Log.e(TAG,e.toString())  

         }finally{  

             if(in != null){  

                 try{  

                     in.close();  

                 }catch(IOException ioe){  

                     Log.e(TAG, ioe.toString());  

                 }  

             }  

         }  

     } 

 }

二、HttpURLConnection 方式

 

URL url = null;

 HttpURLConnection conn = null;

 InputStream in = null;

 OutputStream out = null;

 byte[] data ="测试字符串".getBytes();

 try{

    url =new URL("www.xxx.com/servlet");

    conn = (HttpURLConnection) url.openConnection();

 

    //设置连接属性

    conn.setDoOutput(true);// 使用 URL 连接进行输出

    conn.setDoInput(true);// 使用 URL 连接进行输入

    conn.setUseCaches(false);// 忽略缓存

    conn.setConnectTimeout(30000);//设置连接超时时长，单位毫秒

    conn.setRequestMethod("POST");//设置请求方式，POST or GET，注意：如果请求地址为一个servlet地址的话必须设置成POST方式

 

 //设置请求头

   conn.setRequestProperty("Accept", "*

         private Button btnTest;

         @Override

         public void onCreate(Bundle savedInstanceState) {

                 super.onCreate(savedInstanceState);

                 setContentView(R.layout.main);

                 btnTest = (Button) findViewById(R.id.Button01);

                 btnTest.setOnClickListener(new OnClickListener() {

                         @Override

                         public void onClick(View v) {

                                 getWeather();

                         }

                 });

         }

         private void getWeather(){

                 try {

                         final String SERVER_URL = "http://webservice.webxml.com.cn/WebServices/WeatherWS.asmx/getWeather"; // 定义需要获取的内容来源地址

                         HttpPost request = new HttpPost(SERVER_URL); // 根据内容来源地址创建一个Http请求

                         List params = new ArrayList();

                         params.add(new BasicNameValuePair("theCityCode", "长沙")); // 添加必须的参数

                         params.add(new BasicNameValuePair("theUserID", "")); // 添加必须的参数

                         request.setEntity(new UrlEncodedFormEntity(params, HTTP.UTF_8)); // 设置参数的编码

                         HttpResponse httpResponse = new DefaultHttpClient().execute(request); // 发送请求并获取反馈

 // 解析返回的内容

                         if (httpResponse.getStatusLine().getStatusCode() != 404)

                         {

                                 String result = EntityUtils.toString(httpResponse.getEntity());

                                 System.out.println(result);

                         }

                 } catch (Exception e) {

                 }

         }

 }