博客

需求

如图：得到 页面上的 location 的值

代码实现

ps:参考: https://www.cnblogs.com/zhougaojun/p/4547160.html

https://www.cnblogs.com/niss/p/3711901.html

Jsoup 的实现

	public String json() throws IOException {
		
		 Response execute = Jsoup.connect("https://www.freepik.com/download-file/1088379")
				.followRedirects(false)
				.method(Method.GET)
				.execute();
		
		return execute.headers("location").get(0);
	}

旧版httpclient

private String getMaxUrl(String img_downloard_url) {
		String locale ="";
		//创建Httpclient对象
		CloseableHttpClient httpClient = HttpClients.createDefault();
		

		HttpParams params = httpClient.getParams();  
		params.setParameter(ClientPNames.HANDLE_REDIRECTS, false);
		

		//创建httpGet对象，设置url地址：
		HttpGet httpGet = new HttpGet(img_downloard_url);
		CloseableHttpResponse response= null;
		try {
			
			//使用httpClient发起请求 获取 response
			response = httpClient.execute(httpGet);

			
			//解析响应
			if(response.getStatusLine().getStatusCode() == 302) {
				 org.apache.http.Header locationHeader = response.getFirstHeader("Location");
			      if(locationHeader!=null){
			    	  locale = locationHeader.getValue();
	                    System.out.println(locale);
	               //     LOG.info(MessageFormat.format("[{0}]|[成功{1}]|[url:{2}]|[status:{3}]|[{location:{4}}]",tag,responseCode,googleUrl,responseCode,location));
	             }
				System.out.println(response.getAllHeaders());
				locale = response.getFirstHeader("Location").getValue();
			}

		} catch (Exception e) {
			// TODO Auto-generated catch block
		//	e.printStackTrace();
		}finally {

			try {
				//关闭httpClient
				httpClient.close();
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			try {
				//关闭response
				response.close();
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}

		}
		return locale;
	}
	

新版

private RequestConfig createConfig(int timeout, boolean redirectsEnabled)
{
    retun RequestConfig.custom()
        .setSocketTimeout(timeout)
        .setConnectTimeout(timeout)
        .setConnectionRequestTimeout(timeout)
        .setRedirectsEnabled(redirectsEnabled)
        .build();
}
public void test(String url)
{
　　CloseableHttpClient client = HttpClients.createDefault();   
    try　　
    {　　　　
        HttpGet httpGet = new HttpGet(url);　　　　
        httpGet.setConfig(createConfig(5000, false));　　　　
        CloseableHttpResponse response = client.execute(httpGet);　　　　
        try　　　　
        {　　　　　　
            Header h = response.getFirstHeader("Location");　　　　　　
            if(h!=null)　　　　　　
            {　　　　　　　　　
                System.out.println("重定向地址："+h.getValue());　　　　　　
            }　　　　
        }　　　　
        finally　　　　
        {　　　　　　
            response.close();　　　　
        }　　
    }　　
    finally　　
    {　　
    　　client.close();　　
    }
}