（三）HttpClient 抓取图片

第一节： HttpClient 抓取图片

这里pom.xml需要用到io输入输出：

     <dependency>
         <groupId>commons-io</groupId>
         <artifactId>commons-io</artifactId>
         <version>2.5</version>
     </dependency>

pom.xml 文件：

 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.javaxk</groupId>
   <artifactId>HttpClientTest</artifactId>
   <version>0.0.1-SNAPSHOT</version>

   <dependencies>

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

     <dependency>
         <groupId>commons-io</groupId>
         <artifactId>commons-io</artifactId>
         <version>2.5</version>
     </dependency>

   </dependencies>

 </project>

 package com.javaxk.httpclient.chap03;

 import java.io.File;
 import java.io.InputStream;

 import org.apache.commons.io.FileUtils;
 import org.apache.http.HttpEntity;
 import org.apache.http.client.methods.CloseableHttpResponse;
 import org.apache.http.client.methods.HttpGet;
 import org.apache.http.impl.client.CloseableHttpClient;
 import org.apache.http.impl.client.HttpClients;

 public class Demo1 {

     public static void main(String[] args)throws Exception {
         CloseableHttpClient httpClient=HttpClients.createDefault(); // 创建httpClient实例
         HttpGet httpGet=new HttpGet("http://www.javaxk.com/templets/javaxk/images/logo.jpg"); // 创建httpget实例
         httpGet.setHeader("User-Agent", "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:50.0) Gecko/20100101 Firefox/50.0");
         CloseableHttpResponse response=httpClient.execute(httpGet); // 执行http get请求
         HttpEntity entity=response.getEntity(); // 获取返回实体
         if(entity!=null){
             System.out.println("ContentType:"+entity.getContentType().getValue());
             InputStream inputStream=entity.getContent();
             FileUtils.copyToFile(inputStream, new File("D://logo.jpg"));
         }
         response.close(); // response关闭
         httpClient.close(); // httpClient关闭
     }

 }

运行输出：

ContentType:image/jpeg

D盘下会有一个logo.jpg的图片