//生成一个请求对象
HttpGet httpGet = new HttpGet("http://www.baidu.com");
//生成一个Http客户端对象
HttpClient httpClient = new DefaultHttpClient();
//使用Http客户端发送请求对象
InputStream inputStream = null;
try {
    httpResponse = httpClient.execute(httpGet);
    httpEntity = httpResponse.getEntity();
    inputStream = httpEntity.getContent();
    //文件流操作
    BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
    String result = "";
    String line = "";
    //  StringBuilder builder = new StringBuilder();
while((line = reader.readLine()) != null){
        result = result + line;
   //  builder.append(s);
    }

    System.out.println(result);
} catch (Exception e) {
    // TODO Auto-generated catch block
        e.printStackTrace();
    }
    finally{
        try{
            inputStream.close();
        }
        catch(Exception e){
            e.printStackTrace();
        }
    }
}
/*      JSONObject jsonObject = new JSONObject(builder.toString());
        String re_username = jsonObject.getString("username");
        String re_password = jsonObject.getString("password");
        int re_user_id = jsonObject.getInt("user_id");  

*/

NameValuePair nameValuePair1 = new BasicNameValuePair("name",name); //name为读取的值  
NameValuePair nameValuePair2 = new BasicNameValuePair("age",age); //age为读取的值  
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();  
nameValuePairs.add(nameValuePair1);  
nameValuePairs.add(nameValuePair2);  
//生成Entity对象  
HttpEntity requestHttpEntity = new UrlEncodedFormEntity(nameValuePairs);  
HttpPost httpPost = new HttpPost(url); //这里的url是baseUrl 不用拼上?key=value...  
httpPost.setEntity(requestHttpEntity );  
//之后的操作一样