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HttpClient(图文)

第十三双眼睛2020-03-22【Java】人已围观

简介HttpClient使用

httpclient简单使用
1引入依赖

<dependency>
   <groupId>org.apache.httpcomponents</groupId>
   <artifactId>httpclient</artifactId>
   <version>4.5.2</version>
</dependency>

编写代码示例

public static void main(String[] args) throws Exception {
       CloseableHttpClient httpClient = HttpClients.createDefault();
       HttpGet get = new HttpGet("http://www.tuicool.com");
       CloseableHttpResponse response = httpClient.execute(get);
       HttpEntity entity = response.getEntity();
       String string = EntityUtils.toString(entity,"utf-8");
       System.out.println(string);
       response.close();
       httpClient.close();
}

有的时候，网站会做限制，比如下面这个网站：
http://www.tuicool.com，会出现如下的提示

这时候，只需要添加请求头信息就可以

简单的图片下载

public static void main(String[] args) throws Exception {
       CloseableHttpClient httpClient = HttpClients.createDefault();
       HttpGet get = new HttpGet("http://www.zhaoybbk.com/d/file/p/2019/01-09/6e962e2af6101129845fd4c537f38e93.png");
       get.setHeader("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.88 Safari/537.36");
       CloseableHttpResponse response = httpClient.execute(get);
       HttpEntity entity = response.getEntity();
       if(entity !=null){
           String value = entity.getContentType().getValue();
           InputStream in = entity.getContent();
           FileUtils.copyToFile(in, new File("E://1.png"));
       }
       response.close();
       httpClient.close();
}

就可以将图片下载到指定位置
如果要使用代理的话，设置如下几行就可以

HttpHost proxy = new HttpHost("IP",port);
RequestConfig config = RequestConfig.custom().setProxy(proxy).build();
get.setConfig(config);

如果不超时，就可正常访问
设置超时时间

RequestConfig config = RequestConfig.custom()
.setConnectTimeout(10000)
.setSocketTimeout(10000).build();
get.setConfig(config);

Tags：HttpClient

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