Android使用httpClient进行Post和Get发送参数 .

模拟发送Http请求我们可以使用HttpURLConnection类进行操作，但是Android平台集成了功能强大且编写更容易的commons-httpclient.jar，因此在这里介绍如何通过commons-httpclient进行Http请求。发送Http请求可以有两种方式：一种是同步，一种是异步。由于我对异步不是很熟悉，所以这里先提供同步方式发送Http请求：

1、使用Get方式发送

[java] view plain copy print ?

1. public String httpGet(String url, String params) throws Exception   
2.     {   
3.         String response = null; //返回信息    
4.         if (null!=params&&!params.equals(""))   
5.         {   
6.             url += "?" + params;   
7.         }   
8.         // 构造HttpClient的实例    
9.         HttpClient httpClient = new HttpClient();   
10.         // 创建GET方法的实例    
11.         GetMethod httpGet = new GetMethod(url);   
12.         // 设置超时时间    
13.         httpGet.getParams().setParameter(HttpMethodParams.SO_TIMEOUT, new Integer(CONNECTION_TIMEOUT));   
14.         try  
15.         {   
16.             int statusCode = httpClient.executeMethod(httpGet);   
17.             if (statusCode == HttpStatus.SC_OK) //SC_OK = 200    
18.             {   
19.                 InputStream inputStream = httpGet.getResponseBodyAsStream(); //获取输出流，流中包含服务器返回信息    
20.                 response = getData(inputStream);//获取返回信息    
21.             }   
22.             else  
23.             {   
24.                 LOG.debug("Get Method Statuscode : "+statusCode);   
25.             }   
26.         } catch (Exception e)   
27.         {   
28.             throw new Exception(e);   
29.         } finally  
30.         {   
31.             httpGet.releaseConnection();   
32.             httpClient = null;   
33.         }   
34.         return response;   
35.     }   

public String httpGet(String url, String params) throws Exception 
    { 
        String response = null; //返回信息 
        if (null!=params&&!params.equals("")) 
        { 
            url += "?" + params; 
        } 
        // 构造HttpClient的实例 
        HttpClient httpClient = new HttpClient(); 
        // 创建GET方法的实例 
        GetMethod httpGet = new GetMethod(url); 
        // 设置超时时间 
        httpGet.getParams().setParameter(HttpMethodParams.SO_TIMEOUT, new Integer(CONNECTION_TIMEOUT)); 
        try
        { 
            int statusCode = httpClient.executeMethod(httpGet); 
            if (statusCode == HttpStatus.SC_OK) //SC_OK = 200 
            { 
                InputStream inputStream = httpGet.getResponseBodyAsStream(); //获取输出流，流中包含服务器返回信息 
                response = getData(inputStream);//获取返回信息 
            } 
            else
            { 
                LOG.debug("Get Method Statuscode : "+statusCode); 
            } 
        } catch (Exception e) 
        { 
            throw new Exception(e); 
        } finally
        { 
            httpGet.releaseConnection(); 
            httpClient = null; 
        } 
        return response; 
    } 

 

2、使用Post方式发送

[java] view plain copy print ?

1. public String httpPost(String url, List<Parameter> params) throws Exception   
2.     {   
3.         String response = null;   
4.         HttpClient httpClient = new HttpClient();   
5.         PostMethod httpPost = new PostMethod(url);   
6.         //Post方式我们需要配置参数    
7.         httpPost.addParameter("Connection", "Keep-Alive");   
8.         httpPost.addParameter("Charset", "UTF-8");   
9.         httpPost.addParameter("Content-Type", "application/x-www-form-urlencoded");   
10.         httpPost.getParams().setParameter(HttpMethodParams.SO_TIMEOUT, new Integer(CONNECTION_TIMEOUT));   
11.         if (null!=params&¶ms.size()!=0)   
12.         {   
13.             //设置需要传递的参数，NameValuePair[]    
14.             httpPost.setRequestBody(buildNameValuePair(params));   
15.         }   
16.         try  
17.         {   
18.             int statusCode = httpClient.executeMethod(httpPost);   
19.             if (statusCode == HttpStatus.SC_OK)   
20.             {   
21.                 InputStream inputStream = httpPost.getResponseBodyAsStream();   
22.                 response = getData(inputStream);   
23.             }   
24.             else  
25.             {   
26.                 LOG.debug("Post Method Statuscode : "+statusCode);   
27.             }   
28.         } catch (Exception e)   
29.         {   
30.             throw new Exception(e);   
31.         } finally  
32.         {   
33.             httpPost.releaseConnection();   
34.             httpClient = null;   
35.         }   
36.         return response;   
37.     }   

public String httpPost(String url, List<Parameter> params) throws Exception 
    { 
        String response = null; 
        HttpClient httpClient = new HttpClient(); 
        PostMethod httpPost = new PostMethod(url); 
        //Post方式我们需要配置参数 
        httpPost.addParameter("Connection", "Keep-Alive"); 
        httpPost.addParameter("Charset", "UTF-8"); 
        httpPost.addParameter("Content-Type", "application/x-www-form-urlencoded"); 
        httpPost.getParams().setParameter(HttpMethodParams.SO_TIMEOUT, new Integer(CONNECTION_TIMEOUT)); 
        if (null!=params&¶ms.size()!=0) 
        { 
            //设置需要传递的参数，NameValuePair[] 
            httpPost.setRequestBody(buildNameValuePair(params)); 
        } 
        try
        { 
            int statusCode = httpClient.executeMethod(httpPost); 
            if (statusCode == HttpStatus.SC_OK) 
            { 
                InputStream inputStream = httpPost.getResponseBodyAsStream(); 
                response = getData(inputStream); 
            } 
            else
            { 
                LOG.debug("Post Method Statuscode : "+statusCode); 
            } 
        } catch (Exception e) 
        { 
            throw new Exception(e); 
        } finally
        { 
            httpPost.releaseConnection(); 
            httpClient = null; 
        } 
        return response; 
    } 

3、构件NameValuePair

[java] view plain copy print ?

1. private NameValuePair[] buildNameValuePair(List<Parameter> params)   
2.     {   
3.         int size = params.size();   
4.         NameValuePair[] pair = new NameValuePair[size];   
5.         for(int i = 0 ;i<size;i++)   
6.         {   
7.             Parameter param = params.get(i);   
8.             pair[i] = new NameValuePair(param.getName(),param.getValue());   
9.         }   
10.         return pair;   
11.     }   

private NameValuePair[] buildNameValuePair(List<Parameter> params) 
    { 
        int size = params.size(); 
        NameValuePair[] pair = new NameValuePair[size]; 
        for(int i = 0 ;i<size;i++) 
        { 
            Parameter param = params.get(i); 
            pair[i] = new NameValuePair(param.getName(),param.getValue()); 
        } 
        return pair; 
    } 

4、获得返回数据

[java] view plain copy print ?

1. private String getData(InputStream inputStream) throws Exception   
2.     {   
3.         String data = "";   
4.         //内存缓冲区    
5.         ByteArrayOutputStream outputStream = new ByteArrayOutputStream();   
6.         int len = -1;   
7.         byte[] buff = new byte[1024];   
8.         try  
9.         {   
10.             while((len=inputStream.read(buff))!=-1)   
11.             {   
12.                 outputStream.write(buff, 0, len);   
13.             }   
14.             byte[] bytes = outputStream.toByteArray();   
15.             data = new String(bytes);   
16.         } catch (IOException e)   
17.         {   
18.             throw new Exception(e.getMessage(),e);   
19.         }   
20.         finally  
21.         {   
22.             outputStream.close();   
23.         }   
24.         return data;   
25.     }