Android Http get post请求

来源：互联网发布：中国矢量数据下载编辑：程序博客网时间：2024/05/21 03:27

声明：文章系转载，原文链接不祥。

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首先我们先了解下Get请求和Post请求的区别：

表单提交中get和 post方式的区别有5点：

get是从服务器上获取数据，post是向服务器传送数据。
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HTTP post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。
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。
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。
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());                  }              }          }      } }

三、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", "*/*");  conn.setRequestProperty("Connection", "Keep-Alive");  conn.setRequestProperty("Accept-Charset", "utf-8");  if (data != null) {     out = conn.getOutputStream();     out.write(data);  }  int code = conn.getResponseCode();  if(code ==200){     in = conn.getInputStream();// 可能造成阻塞     long len = conn.getContentLength();     byte[] bs = new byte[(int) len];//返回结果字节数组     int all = 0;  int dn = 0;     while ((dn = in.read(bs, all, 1)) > 0) {       all += dn;       if (all == len) {       break;       }     }  }}

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那么接下来让我们看看在Android平台开发中如何执行一个Post请求：

以下是代码示例：

package com.jixuzou.search;import java.util.ArrayList;import java.util.List;import org.apache.http.HttpResponse;import org.apache.http.NameValuePair;import org.apache.http.client.entity.UrlEncodedFormEntity;import org.apache.http.client.methods.HttpPost;import org.apache.http.impl.client.DefaultHttpClient;import org.apache.http.message.BasicNameValuePair;import org.apache.http.protocol.HTTP;import org.apache.http.util.EntityUtils;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;public class mian extends Activity {        /** Called when the activity is first created. */        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) {                }        }}