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  • 基于servlet的文件下载

     
    package com.future.zfs.util;
    
    import java.io.BufferedInputStream;
    import java.io.BufferedOutputStream;
    import java.io.File;
    import java.io.FileInputStream;
    import java.io.IOException;
    import java.io.InputStream;
    import java.io.OutputStream;
    
    import javax.servlet.ServletException;
    import javax.servlet.http.HttpServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    @SuppressWarnings("serial")
    public class FileDownLoadServlet extends HttpServlet{
        
        @Override
        protected void service(HttpServletRequest request, HttpServletResponse response)
                throws ServletException, IOException {
            String path=request.getParameter("filename");
            path=new String(path.getBytes("ISO-8859-1"),"utf-8");
            download(path,request,response);
        }
        
        @SuppressWarnings("deprecation")
        public HttpServletResponse download(String path,HttpServletRequest request, HttpServletResponse response) {
            try {
                // path是指欲下载的文件的路径。
                File file = new File(request.getRealPath("/")+"/"+path);
                // 取得文件名。
                String filename = file.getName();
                // 取得文件的后缀名。
                //String ext = filename.substring(filename.lastIndexOf(".") + 1).toUpperCase();
    
                // 以流的形式下载文件。
                InputStream fis = new BufferedInputStream(new FileInputStream(file));
                byte[] buffer = new byte[fis.available()];
                fis.read(buffer);
                fis.close();
                // 清空response
                response.reset();
                // 设置response的Header
                response.addHeader("Content-Disposition", "attachment;filename=" + new String(filename.getBytes("utf-8"),"ISO-8859-1"));
                response.addHeader("Content-Length", "" + file.length());
                OutputStream toClient = new BufferedOutputStream(response.getOutputStream());
                response.setContentType("application/octet-stream");
                toClient.write(buffer);
                toClient.flush();
                toClient.close();
            } catch (IOException ex) {
                ex.printStackTrace();
            }
            return response;
        }
    }
    web.xml
    1 <servlet>
    2         <servlet-name>fileDownLoadServlet</servlet-name>
    3         <servlet-class>com.future.zfs.util.FileDownLoadServlet</servlet-class>
    4     </servlet>
    5     <servlet-mapping>
    6         <servlet-name>fileDownLoadServlet</servlet-name>
    7         <url-pattern>/fileDownLoadServlet</url-pattern>
    8     </servlet-mapping>
    9 </servlet>
    1 <a href="fileDownLoadServlet?filename=通讯录.xls">哈哈,测试文件下载</a>

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  • 原文地址:https://www.cnblogs.com/msdn1433/p/3070715.html
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