JAVA Servlet 上传批量上传大文件

最新推荐文章于 2021-06-16 14:16:12 发布

huojunlin

最新推荐文章于 2021-06-16 14:16:12 发布

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文章标签： servlet java file upload string input

新建类 UploadServlet

[java] view plain copy print ?

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:

[html] view plain copy print ?

<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：

[java] view plain copy print ?

<%@ 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>