httpclient访问接口

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本文详细介绍了如何通过HTTP客户端从指定URL获取JSON数据，并解释了关键步骤如创建HttpClient对象、设置请求头、处理响应以及解析JSON数据的过程。

/**
* @author Administrator 
* @date 2015年12月9日 上午10:56:38
* @description 根据url获取json数据
* @parameter  
* @return JsonObject数据
* @throws IOException 
* @throws HttpException 
*/
public void getDataByUrl(String url) throws HttpException, IOException {

   //创建httpClient对象   
        HttpClient client = new HttpClient(); 
  
        //创建post请求方法   
        PostMethod post = new PostMethod(url);
        
        //设置请求超时时间   
        client.getHttpConnectionManager().getParams().setConnectionTimeout(30 * 1000);   
        
        //设置代理服务器的ip地址和端口
        client.getHostConfiguration().setProxy("XXX.XX.XX.XXX", 8080);
        
        //使用抢先认证
        client.getParams().setAuthenticationPreemptive(true);  
              
        String responseString = null;    
         
        //设置请求头部类型   
        post.setRequestHeader("Content-Type","text/xml");  
        post.setRequestHeader(HttpMethodParams.HTTP_CONTENT_CHARSET,"utf-8");  
                               
        //获取状态码
        int statusCode = client.executeMethod(post);
        
        //如果访问成功 statusCode == 200
        if(statusCode == HttpStatus.SC_OK){    
            BufferedInputStream bis = new BufferedInputStream(post.getResponseBodyAsStream()); 
            
            byte[] bytes = new byte[1024];    
            ByteArrayOutputStream bos = new ByteArrayOutputStream();    
            
            int count = 0;    
            
            while((count = bis.read(bytes))!= -1){    
                bos.write(bytes, 0, count);    
            }    
            
            byte[] strByte = bos.toByteArray();    
            responseString = new String(strByte,0,strByte.length,"utf-8");  
            
            bos.close();    
            bis.close();    
        }    


        //释放链接
        post.releaseConnection();   
              
        JSONObject json = JSONObject.parseObject(responseString);

//...........................
}
}