HttpClient抓取图片

1. HttpClient抓取图片

pom.xml

<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.andrew</groupId>
  <artifactId>HttpClientDemo</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>

Demo01.java

package com.andrew.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 Demo01 {
    public static void main(String[] args) throws Exception {
        CloseableHttpClient httpClient = HttpClients.createDefault(); // 创建httpClient实例
        HttpGet httpGet = new HttpGet("http://www.pptbz.com/pptpic/UploadFiles_6909/201203/2012031220134655.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("E://chap03demo01.gif"));
        }
        response.close(); // response关闭
        httpClient.close(); // httpClient关闭
    }
}

运行结果：
ContentType:image/jpeg