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JSP组件commons-fileupload实现文件上传

作者：lijiao　　发布时间：2023-07-03 03:16:01　

标签：JSP,commons,fileupload,文件上传

本文实例为大家分享了JSP使用commons-fileupload实现文件上传代码，供大家参考，具体内容如下

1、准备：

将commons-fileupload-1.1.zip和commons-io-1.1.zip复制到"\WEB-INF\lib"目录下

2、首先是Servlet： FileUpload.java

package servlet;

import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.*;
import java.util.regex.Pattern;
import java.util.regex.Matcher;

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

public class FileUpload extends HttpServlet {

private String uploadPath="E:\\addnetFile\\";//要上传文件的目录
private File tempPath=new File("E:\\tempFile\\");//存放上传的文件的目录

public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
}

public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=GB2312");
response.setCharacterEncoding("gb2312");
PrintWriter out=response.getWriter();
out.println("请求内容的长度为："+request.getContentLength());
out.println("请求内容的类型为："+request.getContentType());

DiskFileItemFactory factory=new DiskFileItemFactory();
factory.setRepository(tempPath);
factory.setSizeThreshold(4096);

ServletFileUpload upload=new ServletFileUpload(factory);
upload.setSizeMax(1000000);
List<?> fileitems=null;
try{
fileitems=upload.parseRequest(request);
Iterator<?> iterator=fileitems.iterator();
String regex=".+\\\\(.+)$";
String[] errortype={".exe",".com",".cgi",".asp"};
Pattern p=Pattern.compile(regex);
while(iterator.hasNext()){
FileItem item=(FileItem) iterator.next();
if(!item.isFormField()){
String name=item.getName();
long size=item.getSize();
if(name==null||name.equals("")&&size==0)
continue;
Matcher m=p.matcher(name);
if(m.find()){
for(int temp=0;temp<errortype.length;temp++){
if(m.group(1).endsWith(errortype[temp]))
throw new IOException(name+":wrong type");
}
try{
item.write(new File(tempPath,m.group(1)));
out.println(name+" "+size+"<br/>");
out.println("上传成功");
}catch(Exception e){
out.println("333"+e);
}
}
else{
throw new IOException("fail to upload");
}

}
}
}catch(IOException e){
out.println("222"+e);
}
catch(FileUploadException e1){
e1.printStackTrace();
out.println("111"+e1);
}
}

public void init() throws ServletException {
if(!new File(uploadPath).isDirectory())
new File(uploadPath).mkdir();
if(!tempPath.isDirectory())
tempPath.mkdir();
}

public void destroy(){
super.destroy();
}

}

3、其次是html：Uploadfile.html

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>Uploadfilel.html</title>

<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="this is my page">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">



</head>

<body>
<form action="/Firstjsp/servlet/FileUpload" method="post" enctype="multipart/form-data" name="form1">
<input type="file" name="file"/>
<input type="submit" name="submit" value="upload"/>
</form>
<form action="/Firstjsp/servlet/FileUpload" method="post" enctype="multipart/form-data" name="uploadform">
<table>
<tr>
<td>
文件1：<input type="file" name="X" size="40"/>
</td>
</tr>
<tr>
<td>
文件2：<input type="file" name="Y" size="40"/>
</td>
</tr>
<tr>
<td>
文件3：<input type="file" name="Z" size="40"/>
</td>
</tr>
</table>
<input type="submit" name="upload" value="开始上传"/>
</form>
</body>
</html>

4、最后是配置web.xml

<servlet>
<description>This is the description of my J2EE component</description>
<display-name>This is the display name of my J2EE component</display-name>
<servlet-name>FileUpload</servlet-name>
<servlet-class>servlet.FileUpload</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>FileUpload</servlet-name>
<url-pattern>/servlet/FileUpload</url-pattern>

首先运行html，servlet处理上传请求

投稿

JSP组件commons-fileupload实现文件上传

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