使用Java从云库里读取文件修改名称下载文件

ゞ浴缸里的玫瑰 2022-08-10 10:54 175阅读 0赞

因为公司的视频和图片存储在云存储里面，项目部署在本公司服务器，给用户下载的时候需要修改成用户上传时候的名称，

import java.io.FileNotFoundException;
    import java.io.IOException;
    import java.io.InputStream;
    import java.io.OutputStream;
    import java.io.UnsupportedEncodingException;
    import java.net.HttpURLConnection;
    import java.net.URL;
    import java.net.URLEncoder;
    
    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RequestParam;
    
    @Controller
    @RequestMapping("/download")
    public class DownLoadController extends BaseController{
    
    	@RequestMapping(value="/down.do")
    	public String downloadFile(@RequestParam(value="url",required=true)String url) throws UnsupportedEncodingException{
    		String name=new String("你好.flv".getBytes("UTF-8"),"iso-8859-1");
    		response.setCharacterEncoding("utf-8");
            response.setContentType("multipart/form-data");
            response.setHeader("Content-Disposition", "attachment;fileName="
                    + name);
            
            try {
            	HttpURLConnection conn=null;
        		InputStream in=null;
        		URL fileUrl=new URL(url);
        			
        			conn=(HttpURLConnection)fileUrl.openConnection();
        			conn.setConnectTimeout(2000);
        			conn.connect();
        		int fileLength=conn.getContentLength();
        		in=conn.getInputStream();
        		response.setContentLength(fileLength);
                OutputStream os = response.getOutputStream();
                byte[] b = new byte[2048];
                int length;
                while ((length = in.read(b)) > 0) {
                    os.write(b, 0, length);
                }
                os.flush();
                os.close();
                
     
                in.close();
                conn.disconnect();
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return null;
    	}
    }

本方法是读取云库中的文件，部署本地的文件

谢谢支持，多少都行

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