（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：

1     <dependency>
2         <groupId>commons-io</groupId>
3         <artifactId>commons-io</artifactId>
4         <version>2.5</version>
5     </dependency>

pom.xml 文件：

 1 <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">
 2   <modelVersion>4.0.0</modelVersion>
 3   <groupId>com.javaxk</groupId>
 4   <artifactId>HttpClientTest</artifactId>
 5   <version>0.0.1-SNAPSHOT</version>
 6   
 7   <dependencies>
 8   
 9       <dependency>
10         <groupId>org.apache.httpcomponents</groupId>
11         <artifactId>httpclient</artifactId>
12         <version>4.5.2</version>
13     </dependency>
14     
15     <dependency>
16         <groupId>commons-io</groupId>
17         <artifactId>commons-io</artifactId>
18         <version>2.5</version>
19     </dependency>
20 
21   </dependencies>
22   
23 </project>

 1 package com.javaxk.httpclient.chap03;
 2 
 3 import java.io.File;
 4 import java.io.InputStream;
 5 
 6 import org.apache.commons.io.FileUtils;
 7 import org.apache.http.HttpEntity;
 8 import org.apache.http.client.methods.CloseableHttpResponse;
 9 import org.apache.http.client.methods.HttpGet;
10 import org.apache.http.impl.client.CloseableHttpClient;
11 import org.apache.http.impl.client.HttpClients;
12 
13 public class Demo1 {
14     
15     public static void main(String[] args)throws Exception {
16         CloseableHttpClient httpClient=HttpClients.createDefault(); // 创建httpClient实例
17         HttpGet httpGet=new HttpGet("http://www.javaxk.com/templets/javaxk/images/logo.jpg"); // 创建httpget实例
18         httpGet.setHeader("User-Agent", "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:50.0) Gecko/20100101 Firefox/50.0");
19         CloseableHttpResponse response=httpClient.execute(httpGet); // 执行http get请求
20         HttpEntity entity=response.getEntity(); // 获取返回实体
21         if(entity!=null){
22             System.out.println("ContentType:"+entity.getContentType().getValue());
23             InputStream inputStream=entity.getContent();
24             FileUtils.copyToFile(inputStream, new File("D://logo.jpg"));
25         }
26         response.close(); // response关闭
27         httpClient.close(); // httpClient关闭
28     }
29 
30 }

运行输出：

ContentType:image/jpeg

D盘下会有一个logo.jpg的图片