图片下载到本地

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Objects;
/**
 * 下载网络远程图片
 *
 * @author saber
 */
public class DownImgUtils {
    private static Logger LOGGER = LoggerFactory.getLogger(DownImgUtils.class);
    public static String downloadURL(String fileUrl) {
        //LOGGER.info("开始执行将图片下载到本地,fileUrl:{}",fileUrl);
        String fileName = "";
        //获取文件名，文件名实际上在URL中可以找到
        int pos = fileUrl.indexOf('?');
        String newUrl = fileUrl;
        if (pos > 0) {
            newUrl = newUrl.substring(0, pos);
        }
        pos = newUrl.lastIndexOf('/');
        fileName = newUrl.substring(pos + 1);
        fileName = "uploadImg_" + fileName;
        //这里服务器上要将此图保存的路径
        String savePath = System.getProperty("java.io.tmpdir");
        fileName = savePath +"/"+ fileName;
        HttpURLConnection connection = null;
        DataInputStream in = null;
        DataOutputStream out = null;
        try {
            URL url = new URL(fileUrl);
            connection = (HttpURLConnection) url.openConnection();
            connection.setReadTimeout(30000);
            connection.setConnectTimeout(30000);
            in = new DataInputStream(connection.getInputStream());
            out = new DataOutputStream(new FileOutputStream(fileName));
            byte[] buffer = new byte[4096];
            int count = 0;
            while ((count = in.read(buffer)) > 0) {
                out.write(buffer, 0, count);
            }
            out.close();
            in.close();
            connection.disconnect();
        } catch (Exception e) {
            System.out.println(e + fileUrl + savePath);
        } finally {
            try {
                if (Objects.nonNull(out)) {
                    out.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
            try {
                if (Objects.nonNull(in)) {
                    in.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
            connection.disconnect();
        }
        //LOGGER.info("结束执行将图片下载到本地,fileUrl:{}",fileUrl);
        return fileName;
    }
}