HttpClient请求工具类，不适用于下载

2520阅读　0评论2015-04-23　vibe26
分类：Android平台


HttpClientUtil.java

  1. package com.vibexie.jianai.Utils;

  3. import android.os.Handler;
  4. import android.os.Message;

  6. import org.apache.http.HttpResponse;
  7. import org.apache.http.NameValuePair;
  8. import org.apache.http.client.entity.UrlEncodedFormEntity;
  9. import org.apache.http.client.methods.HttpPost;
  10. import org.apache.http.impl.client.DefaultHttpClient;
  11. import org.apache.http.params.BasicHttpParams;
  12. import org.apache.http.params.HttpConnectionParams;
  13. import org.apache.http.params.HttpParams;
  14. import org.apache.http.util.EntityUtils;

  16. import java.io.IOException;
  17. import java.io.UnsupportedEncodingException;
  18. import java.util.List;

  20. /**
  21.  * HttpClient的工具类
  22.  * Created by vibexie on 4/17/15.
  23.  *
  24.  * 这个工具类可能使用起来比较麻烦，但是它解决了网络连接超时的问题，使得UI主线程不会因为网络连接时间过长而产生ANR
  25.  */
  26. public class HttpClientUtil {

  28.     /**
  29.      * post请求方法，注意这个方法里自动创建了一条线程
  30.      * @param url url地址
  31.      * @param params 请求参数
  32.      * @param handler 关联的handler
  33.      */
  34.     public static void doPost(final String url,final List<NameValuePair> params,final Handler handler){
  35. /****************************** 使用说明 **************************/
  36. //
  37. // /**
  38. // * 构建请求url
  39. // */
  40. // String url=ServerConf.SERVER_ADDR+"JianaiServer/RegisterServlet";
  41. //
  42. // /**
  43. // * 构建url请求参数
  44. // */
  45. // List params=new ArrayList();
  46. // params.add(new BasicNameValuePair("cmd", RegisterCmd.REQUEST_VERIFING_CODE));
  47. // params.add(new BasicNameValuePair("info","vibexie@qq.com"));
  48. //
  49. // /**
  50. // * 构建handler,在handler中获取并处理结果
  51. // */
  52. // Handler handler=new Handler(){
  53. // @Override
  54. // public void handleMessage(Message msg) {
  55. // super.handleMessage(msg);
  56. // String result=(String)msg.obj;
  57. // Toast.makeText(RegisterForVerifyingCodeActivity.this,result,Toast.LENGTH_SHORT).show();
  58. //
  59. // }
  60. // };
  61. //
  62. // /**
  63. // * 调用请求方法
  64. // */
  65. // HttpClientUtil.doPost(url, params,handler);
  66. /****************************** 使用说明 **************************/

  68.         /**
  69.          * 创建新线程
  70.          */
  71.         new Thread(new Runnable() {

  73.             @Override
  74.             public void run() {
  75.                 /**
  76.                  * 返回的结果
  77.                  */
  78.                 String result=null;

  80.                 /**
  81.                  * 国外程序员使用的超时方案
  82.                  */
  83.                 HttpParams httpParams=new BasicHttpParams();
  84.                 HttpConnectionParams.setConnectionTimeout(httpParams,20000);
  85.                 HttpConnectionParams.setSoTimeout(httpParams,20000);

  87.                 DefaultHttpClient httpClient= new DefaultHttpClient(httpParams);

  89.                 /**
  90.                  * 也可以这样设置超时
  91.                  */
  92. // /**
  93. // * 设置请求超时60秒
  94. // */
  95. // httpClient.getParams().setParameter(CoreConnectionPNames.CONNECTION_TIMEOUT,10000);
  96. //
  97. // /**
  98. // * 设置数据传输超时60秒
  99. // */
  100. // httpClient.getParams().setParameter(CoreConnectionPNames.SO_TIMEOUT,10000);

  102.                 HttpPost httpPost=new HttpPost(url);

  104.                 /**
  105.                  * 设置请求参数
  106.                  */
  107.                 UrlEncodedFormEntity entity= null;
  108.                 try {
  109.                     entity = new UrlEncodedFormEntity(params,"UTF-8");
  110.                 } catch (UnsupportedEncodingException e) {
  111.                     e.printStackTrace();
  112.                 }
  113.                 httpPost.setEntity(entity);

  115.                 /**
  116.                  * 执行请求并获得返回结果
  117.                  */
  118.                 try {
  119.                     HttpResponse httpResponse=httpClient.execute(httpPost);

  121.                     if(httpResponse.getStatusLine().getStatusCode()==200){
  122.                         result=EntityUtils.toString(httpResponse.getEntity());
  123.                     }

  125.                 } catch (IOException e) {
  126.                     e.printStackTrace();
  127.                 } finally {
  128.                     /**
  129.                      * 关闭httpClient，这也是不将httpClient设置为类的静态属性的原因
  130.                      *
  131.                      * 特别注意，不能在解析httpResponse.getEntity()前关闭连接，这里非常容易犯错
  132.                      */
  133.                     httpClient.getConnectionManager().shutdown();
  134.                 }

  136.                 /**
  137.                  * 未返回结果，请求超时或服务器关闭，置result为refused
  138.                  */
  139.                 if(result==null){
  140.                     result="refused";
  141.                 }

  143.                 /**
  144.                  * 发送返回结果给handler
  145.                  */
  146.                 Message message=Message.obtain();
  147.                 message.obj=result;
  148.                 handler.sendMessage(message);
  149.             }
  150.         }).start();
  151.     }
  152. }


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