通过url地址下载文件代码

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本文链接： https://blog.csdn.net/qq_30576089/article/details/102743359

代码如下：

package com.benefm.down.controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
@RequestMapping("/fileDown")
@Controller
public class FileDownController {
    @ResponseBody
    @RequestMapping("/downECG")
    public void downECG(HttpServletRequest request,HttpServletResponse response) throws Exception{
        String urlstr = "http://downloadapk.mymagicangel.com/ECG_4G.apk";
        if(urlstr==null)
            return ;
       // 根据url获取输入流
        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();
        response.reset();
        response.setHeader("Content-Disposition", "attachment;fileName=" + "ECG_4G.apk");
        response.setContentType("application/force-download");
        response.setContentType("multipart/form-data");
        // url = URLEncoder.encode(url,"UTF-8");
        try {
//            InputStream inStream = new FileInputStream(url);
            OutputStream os = response.getOutputStream();
            byte[] buff = new byte[1024];
            int len = -1;
            while ((len = inputStream.read(buff)) > 0) {
                os.write(buff, 0, len);
            }
            os.flush();
            os.close();
            inputStream.close();
        } catch (Exception e) {
            e.printStackTrace();
            return ;
        }
        return ;
    }
}