httpclient

最新推荐文章于 2022-12-08 14:47:20 发布

iteye_137

最新推荐文章于 2022-12-08 14:47:20 发布

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CC 4.0 BY-SA版权

分类专栏： WebService

本文链接：https://blog.youkuaiyun.com/iteye_137/article/details/82168359

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本文详细介绍了使用HttpClient进行HTTP请求的构建与响应体获取的方法，包括设置超时、重试策略及请求头配置，以及如何从响应中提取字符串数据。

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public String getResponseBody(String url){
		HttpClient client = new HttpClient();
		GetMethod method = new GetMethod(url);
		//这里加或者不加都可以，看情况定
                                method.setRequestHeader("Content-Type","application/x-www-form-urlencoded; charset=utf-8");
                                method.getParams().setParameter(HttpMethodParams.SO_TIMEOUT,5000);
		method.getParams().setParameter(HttpMethodParams.RETRY_HANDLER,
			      new DefaultHttpMethodRetryHandler());
		
		try {
	        int statusCode = client.executeMethod(method);

	        if(statusCode != HttpStatus.SC_OK){
	        	System.err.println("Method failed: " + method.getStatusLine());
	        }

	        byte[] responseBody = method.getResponseBody();

	        String str = new String(responseBody); 
                        //或者用以下方式获取结果(2)
	        //String str2 = method.getResponseBodyAsString();
                        //或者用以下方式获取结果(3)
                //InputStream is = getMethod.getResponseBodyAsStream();
                        //String returnStr = convertStreamToString(is);
	        
	        return str;
		}catch(HttpException e){
			System.err.println("Fatal protocol violation: " + e.getMessage());
		    e.printStackTrace();
		}catch(IOException e){
			System.err.println("Fatal transport error: " + e.getMessage());
		    e.printStackTrace();
		}finally{
		     method.releaseConnection();
		} 
		
		return null;
	}

public String convertStreamToString(InputStream is)
	   throws UnsupportedEncodingException {

	  BufferedReader reader = new BufferedReader(new InputStreamReader(is,
	    "UTF-8"));
	  StringBuilder sb = new StringBuilder();

	  String line = null;
	  try {
	   while ((line = reader.readLine()) != null) {
	    sb.append(line + "\n");
	   }
	  } catch (IOException e) {
	   e.printStackTrace();
	  } finally {
	   try {
	    is.close();
	   } catch (IOException e) {
	    e.printStackTrace();
	   }
	  }

	  return sb.toString();
	 }