ネットワークのURLダウンロードファイル

     これは取るに直接使用することができます

DownLoadFromUrlController

package com.richfit.richfit.controller;

import com.richfit.richfit.DownLoadFromUrlUtil;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import io.swagger.annotations.ApiParam;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

import java.io.File;

/**
 * @ClassName DownLoadFromUrlController
 * @Description:
 * @Author BruthLi
 * @Date 2020/2/9
 * @Version V1.0
 **/
@Api(value = "从网络Url中下载文件")
@RestController
@RequestMapping(value = "/sys/downUrl")
@Slf4j
public class DownLoadFromUrlController {
    @ApiOperation(value = "从网络Url中下载文件", notes = "从网络Url中下载文件")
    @RequestMapping(value = "/downFromOUTUrl", method = RequestMethod.POST)
    public File sendEmail(@ApiParam(name = "urlStr",value = "下载网络地址",required = true) @RequestParam(value = "urlStr",required = true)String urlStr,
                          @ApiParam(name = "fileName",value = "下载内容放到例如 text.txt文件名称",required = true) @RequestParam(value = "fileName",required = true)String fileName,
                          @ApiParam(name = "savePath",value = "保存路径",required = true)@RequestParam(value = "savePath",required = true)String savePath)throws Exception{
        return DownLoadFromUrlUtil.downLoadFromUrl(urlStr,fileName,savePath);
    }
}

DownLoadFromUrlUtil

package com.richfit.richfit;

import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;

/**
 * @ClassName DownLoadFromUrlUtil
 * @Description: 从网络Url中下载文件
 * @Author BruthLi
 * @Date 2020/2/9
 * @Version V1.0
 **/
public class DownLoadFromUrlUtil {
    /**
     * 从网络Url中下载文件
     * @param urlStr
     * @param fileName
     * @param savePath
     * @throws IOException
     */
    public static File downLoadFromUrl(String urlStr, String fileName,String savePath) throws IOException {
        URL url = new URL(urlStr);
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        // 设置超时间为3秒
        conn.setConnectTimeout(3 * 1000);
        // 防止屏蔽程序抓取而返回403错误
        conn.setRequestProperty("User-Agent","Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)");

        // 得到输入流
        InputStream inputStream = conn.getInputStream();
        // 获取自己数组
        byte[] getData = readInputStream(inputStream);

        // 文件保存位置
        File saveDir = new File(savePath);
        if (!saveDir.exists()) {
            saveDir.mkdir();
        }
        File file = new File(saveDir + File.separator + fileName);
        FileOutputStream fos = new FileOutputStream(file);
        fos.write(getData);
        if (fos != null) {
            fos.close();
        }
        if (inputStream != null) {
            inputStream.close();
        }

        System.out.println("info:" + url + " download success");
       return file;
    }

    /**
     * 从输入流中获取字节数组
     * @param inputStream
     * @return
     * @throws IOException
     */
    public static byte[] readInputStream(InputStream inputStream)throws IOException {
        byte[] buffer = new byte[1024];
        int len = 0;
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        while ((len = inputStream.read(buffer)) != -1) {
            bos.write(buffer, 0, len);
        }
        bos.close();
        return bos.toByteArray();
    }
}