頁面jsp<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Insert title here</title>
</head>
<script type="text/javascript" src="js/jquery-1.4.2.min.js"></script>
<body>
<form action="fileupload" method="post" enctype="multipart/form-data">
文件：<input type="file" id="file" name="file"/>
<input type="submit" value="上傳" name="submit"/>
</form>
</body>
</html>後臺java
package servlet;
import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Iterator;
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.FileItemFactory;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
public class FileuploadServlet extends HttpServlet{
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
this.doPost(request, response);
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
boolean ismultipart = ServletFileUpload.isMultipartContent(request);
if(ismultipart){
FileItemFactory factory = new DiskFileItemFactory();
ServletFileUpload upload = new ServletFileUpload(factory);
Iterator items;
try {
items = upload.parseRequest(request).iterator();
while (items.hasNext()) {
FileItem item = (FileItem) items.next();
if(!item.isFormField()){
//取出上傳文件的文件名稱
String name = item.getName();
String filename = name.substring(name.lastIndexOf("\\")+1, name.length());
String path = request.getRealPath("file")+File.separatorChar+filename;
//上傳文件
File uploadFile = new File(path);
item.write(uploadFile);
//打印上傳成功信息
response.setContentType("text/html");
response.setCharacterEncoding("utf-8");
PrintWriter out = response.getWriter();
out.print("<font size='2'>上傳的文件爲："+name+"<br/>");
out.print("保存的地址爲"+path+"</font>");
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
web.xml
<servlet-name>fileupload</servlet-name>
<servlet-class>servlet.FileuploadServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>fileupload</servlet-name>
<url-pattern>/fileupload</url-pattern>
</servlet-mapping>注意：servlet 文件上傳要用到commons-fileupload-1.2.2.jar、commons-io-2.4.jar 兩個jar包
這兩個包可到http://jakarta.apache.org/site/downloads/ 下載commons-fileupload-1.2-bin-zip 和commons-io-1.3.2-bin-zip 兩個壓縮文件 。