Servlet多文件打包下载详解编程语言

Servlet代码

    package project;   
       
    import java.io.File;   
    import java.io.FileInputStream;   
    import java.io.IOException;   
    import java.util.Date;   
       
    import javax.servlet.ServletException;   
    import javax.servlet.http.HttpServlet;   
    import javax.servlet.http.HttpServletRequest;   
    import javax.servlet.http.HttpServletResponse;   
    import java.util.zip.*;   
    /**  
     * Servlet实现多文件打包下载  
     * @author Frank  
     *  
     */   
    public class Download extends HttpServlet {   
       
        /**  
         *   
         */   
        private static final long serialVersionUID = -1379339763454618902L;   
       
        public Download() {   
            super();   
        }   
           
        /**  
         * doPost提交方式  
         */   
        public void doPost(HttpServletRequest request, HttpServletResponse response)   
                throws ServletException, IOException {   
            this.doGet(request, response);   
        }   
           
        /**  
         * doGet提交方式  
         */   
        public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {   
            response.setContentType("APPLICATION/OCTET-STREAM");   
            response.setHeader("Content-Disposition", "attachment; filename="+ this.getZipFilename());   
            System.out.println("in BatchDownload................");   
            ZipOutputStream zos = new ZipOutputStream(response.getOutputStream());   
            File[] files = new File[3];   
            /*这里可以根据前台进行赋值,我这样做事为了快速做测试而已 */   
            files[0] = new File("F:/1111.png");   
            files[1] = new File("F:/11.png");   
            files[2] = new File("D:/testduo");   
            for(File f:files){   
                zipFile(f, "", zos);   
            }   
            zos.flush();   
            zos.close();   
        }   
           
        /**  
         * 使用递归进行文件夹,文件的扫描  
         */   
        private void zipFile(File subs, String baseName, ZipOutputStream zos)throws IOException {   
            if(subs.exists()){   
                if(subs.isFile()){   
                    zos.putNextEntry(new ZipEntry(baseName + subs.getName()));   
                    FileInputStream fis = new FileInputStream(subs);   
                    byte[] buffer = new byte[1024];   
                    int r = 0;   
                    while ((r = fis.read(buffer)) != -1) {   
                        zos.write(buffer, 0, r);   
                    }   
                    fis.close();   
                }else{   
                    //如果是目录。递归查找里面的文件   
                    String dirName = baseName + subs.getName() + "/";   
                    zos.putNextEntry(new ZipEntry(dirName));   
                    File[] sub = subs.listFiles();   
                    for (File f : sub) {   
                        zipFile(f, dirName, zos);   
                    }   
                }   
            }   
           
        }   
       
        /**  
         * 获取zip文件名  
         * @return  
         */   
        private String getZipFilename() {   
            Date date = new Date();   
            String s = date.getTime() + ".zip";   
            return s;   
        }   
       
    }  

Web.xml配置

    <?xml version="1.0" encoding="utf-8" ?>   
    <!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd">   
    <web-app>        
      <servlet>   
            <servlet-name>Down</servlet-name>   
            <servlet-class>project.Download</servlet-class>   
      </servlet>   
      <servlet-mapping>   
            <servlet-name>Down</servlet-name>   
            <url-pattern>/scripts/Down</url-pattern>   
      </servlet-mapping>   
        
       <welcome-file-list>   
            <welcome-file>/login.jsp</welcome-file>   
       </welcome-file-list>   
     </web-app>