<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
<servlet>
<servlet-name>UploadServlet</servlet-name>
<servlet-class>com.zr.uploaddownload.servlet.UploadServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>UploadServlet</servlet-name>
<url-pattern>/UploadServlet</url-pattern>
</servlet-mapping>
</web-app>
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>test upload</title>
</head>
<body>
<form action="UploadServlet" method="post" enctype="multipart/form-data">
上传文件：<input type="file" name="file"/><br><br>
<span>文件介绍：</span><br>
<textarea rows="5" cols="35" name="text"></textarea>
<br><br>
<input type="submit" value="提交">
</form>
</body>
</html>
package com.zr.uploaddownload.servlet;
import java.io.File;
import java.io.IOException;
import java.util.Date;
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.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
/**
*
* @author lf
*
*/
public class UploadServlet extends HttpServlet{
private static final long serialVersionUID = 1L;
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
// System.out.println("UploadServlet...doPost...");
//设置编码（应该在filter进行设置编码）
/*req.setCharacterEncoding("utf-8");
resp.setCharacterEncoding("utf-8");*/
// 创建DiskFileItem工厂
DiskFileItemFactory factory = new DiskFileItemFactory();
// 设置内存大小
factory.setSizeThreshold(1024*1024);
//设置超出内存大小时，文件的临时存放路径
factory.setRepository(new File("D:\tempFile"));
// 创建上传的对象
ServletFileUpload upload = new ServletFileUpload(factory);
// 设置单个文件上传的最大值（5M）
upload.setSizeMax(1024*1024*5);
List<FileItem> items = null;
try {
// 解析请求
items = upload.parseRequest(req);
Iterator<FileItem> iter = items.iterator();
while (iter.hasNext()) {
FileItem item = (FileItem) iter.next();
if (item.isFormField()) {
//文本域处理
String name = item.getFieldName();
String value = item.getString();
System.out.println("name:"+name+"
value:"+value);
} else {
//文件域处理
String fieldName = item.getFieldName();
//获取文件名
String fileName = item.getName();
String contentType = item.getContentType();
boolean isInMemory = item.isInMemory();
long sizeInBytes = item.getSize();
System.out.println("fieldName:"+fieldName
+"
fileName"+fileName+"
contentType"
+contentType+"
isInMemory"+isInMemory
+"
sizeInBytes"+sizeInBytes);
//文件名
String name = fileName.substring(fileName.indexOf("."));
//通过随机数产生文件名
String str = new Date().getTime()+""+(int)Math.random()*10000;
//上传文件保存的路径
String path = "D:\"+str+name;
File uploadedFile = new File(path);
// 将路径写入数据库（在此不进行写入数据库的操作）
try {
item.write(uploadedFile);
} catch (Exception e) {
e.printStackTrace();
}
}
}
} catch (FileUploadException e) {
e.printStackTrace();
}
}
}