java上传处理-Servlet 批量上传大文件

新建类UploadServlet

 

 

package org.action;

 import java.io.File;
 import java.io.IOException;
 import java.util.Iterator;
 import java.util.List;

 import javax.servlet.ServletException;
 import javax.servlet.http.HttpServlet;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;

 import org.apache.commons.fileupload.FileItem;
 import org.apache.commons.fileupload.disk.DiskFileItemFactory;
 import org.apache.commons.fileupload.servlet.ServletFileUpload;

 @SuppressWarnings("unchecked")
 public class UploadServlet extends HttpServlet{

     private static final long serialVersionUID = 1L ;

     @Override
     protected void doGet(HttpServletRequest req, HttpServletResponse resp)
             throws ServletException, IOException {
        doPost(req, resp) ;
    }

     @Override
     protected void doPost(HttpServletRequest request, HttpServletResponse response )
             throws ServletException, IOException {
         DiskFileItemFactory factory = new DiskFileItemFactory() ;
         factory.setSizeThreshold( 8192 ) ;
         String tempPath = request.getSession().getServletContext().getRealPath( "/")
             + "/upload" ;
         File file = new File( tempPath ) ;
         if(!file.isDirectory()){
            file.mkdirs();
        }
        factory.setRepository( file ) ;
         ServletFileUpload upload = new ServletFileUpload( factory ) ;

        List<FileItem> items;
         try {
            items = upload.parseRequest(request);
            Iterator<FileItem> itr = items.iterator();
             while (itr.hasNext()) {// 依次处理每个 form field
                   FileItem item = (FileItem) itr.next();
                    if(!item.isFormField()){ /* 判断是否为表单控件（非File控件），如果不是表单控件，则上传此文件 */
                        File savedFile = new File( tempPath ,  item.getName() ) ;
                       item.write(savedFile) ;
                    }else{/* 如果是表单控件，则保存其值*/
                        System.out.println( item.getFieldName() + "-->" + item.getString() ) ;
                   }
            }
         }catch (Exception e){
            e.printStackTrace() ;
        }
    }

}

package org.action; import java.io.File; import java.io.IOException; import java.util.Iterator; import java.util.List; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.commons.fileupload.FileItem; import org.apache.commons.fileupload.disk.DiskFileItemFactory; import org.apache.commons.fileupload.servlet.ServletFileUpload; @SuppressWarnings("unchecked") public class UploadServlet extends HttpServlet{ private static final long serialVersionUID = 1L ; @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { doPost(req, resp) ; } @Override protected void doPost(HttpServletRequest request, HttpServletResponse response ) throws ServletException, IOException { DiskFileItemFactory factory = new DiskFileItemFactory() ; factory.setSizeThreshold( 8192 ) ; String tempPath = request.getSession().getServletContext().getRealPath( "/") + "/upload" ; File file = new File( tempPath ) ; if(!file.isDirectory()){ file.mkdirs(); } factory.setRepository( file ) ; ServletFileUpload upload = new ServletFileUpload( factory ) ; List<FileItem> items; try { items = upload.parseRequest(request); Iterator<FileItem> itr = items.iterator(); while (itr.hasNext()) {// 依次处理每个 form field FileItem item = (FileItem) itr.next(); if(!item.isFormField()){ /* 判断是否为表单控件（非File控件），如果不是表单控件，则上传此文件 */ File savedFile = new File( tempPath , item.getName() ) ; item.write(savedFile) ; }else{/* 如果是表单控件，则保存其值*/ System.out.println( item.getFieldName() + "-->" + item.getString() ) ; } } }catch (Exception e){ e.printStackTrace() ; } } } 在web.xml 中配置:

 

 

 

<servlet>
     <servlet-name>upload</servlet-name>
     <servlet-class>org.action.UploadServlet</servlet-class>
  </servlet>
  <servlet-mapping>
     <servlet-name>upload</servlet-name>
     <url-pattern>/upload</url-pattern>
  </servlet-mapping>

<servlet> <servlet-name>upload</servlet-name> <servlet-class>org.action.UploadServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>upload</servlet-name> <url-pattern>/upload</url-pattern> </servlet-mapping>
页面代码：

 

 

<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>
<%
String path = request.getContextPath();
 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
     <base href="<%=basePath%>">

     <title>My JSP 'index.jsp' starting page</title>
     <meta http-equiv="pragma" content="no-cache">
     <meta http-equiv="cache-control" content="no-cache">
     <meta http-equiv="expires" content="0">
     <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
     <meta http-equiv="description" content="This is my page">
  </head>

  <body>
         <form action="<%=basePath %>upload" method="post" enctype="multipart/form-data">
             <input type="file" name="file"/>
             <input value="name" name="name" type="text" />
             <input type="submit"/>
        </form>
  </body>
</html>

<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <base href="<%=basePath%>"> <title>My JSP 'index.jsp' starting page</title> <meta http-equiv="pragma" content="no-cache"> <meta http-equiv="cache-control" content="no-cache"> <meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="This is my page"> </head> <body> <form action="<%=basePath %>upload" method="post" enctype="multipart/form-data"> <input type="file" name="file"/> <input value="name" name="name" type="text" /> <input type="submit"/> </form> </body> </html>

 

依赖的jar包，commons-fileupload-1.1.jar 和commons-io-1.1.jar