（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