第4个HttpClient 例子，下载指定图片并保存到请定目录

第4个HttpClient 例子，下载指定图片并保存到请定目录

pom.xml

<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>

代码：

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;
import org.apache.commons.io.FileUtils;
import java.io.File;
import java.io.InputStream;


public class Demo02 {
    public static void main(String[] args) throws Exception {
        //创建HttpClient实例
        CloseableHttpClient client = HttpClients.createDefault();
        //创建httpget实例
        HttpGet get = new HttpGet("https://www.oracle.com/us/assets/hp10p2-oracle-code-sprite-3861772.jpg");
        //设置请求头信息
        get.setHeader("User-Agent", "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:50.0) Gecko/20100101 Firefox/50.0");
        //执行http get 请求
        CloseableHttpResponse execute = client.execute(get);
        //获取返回的实体
        HttpEntity entity = execute.getEntity();
        if (entity!=null){
            //输入返回的内容
            System.out.println("Content-Type:"+entity.getContentType().getValue());
            InputStream inputStream=entity.getContent();
            //保存到指定的目录
            FileUtils.copyToFile(inputStream, new File("C://dljd4.jpg"));
        }

        //response 关闭
        execute.close();
        //httpclient 关闭
        client.close();
    }
}

运行结果：

Content-Type:image/jpeg; charset=

Process finished with exit code 0