实现中文文件下载

Dear 丶 2022-05-16 06:18 218阅读 0赞

package cn.itcast.response;
    
    import java.io.FileInputStream;
    import java.io.IOException;
    import java.io.OutputStream;
    import java.net.URLEncoder;
    
    import javax.servlet.ServletException;
    import javax.servlet.http.HttpServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    //实现中文文件下载
    public class ResponseDemo3 extends HttpServlet {
        
    
        public void doGet(HttpServletRequest request, HttpServletResponse response)
                throws ServletException, IOException {
    
            //1.获取需要下载的文件
            String path = this.getServletContext().getRealPath("/download/日本妞.jpg");
            String filename = path.substring(path.lastIndexOf("\\")+1);
    
            //2.通知浏览器以下载方式打开  (下载的中文文件名必须要给过URL编码)
            response.setHeader("content-disposition", "attachment;filename="+URLEncoder.encode(filename, "UTF-8"));
    
            //3.向浏览器写出数据
            FileInputStream in = null;
            try{
                OutputStream out = response.getOutputStream();
                in = new FileInputStream(path);
    
                byte buffer[] = new byte[1024];
                int len = 0;
                while((len=in.read(buffer))>0){
                    out.write(buffer,0,len);
                }
            }finally{
                if(in!=null){
                    in.close();
                }
            }
    
        }
    
        public void doPost(HttpServletRequest request, HttpServletResponse response)
                throws ServletException, IOException {
            doGet(request, response);
        }
    
    }