书籍是全世界的营养品。生活里没有书籍，就好像没有阳光；智慧里没有书籍，就好像鸟儿没有翅膀。
html页面代码：
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!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>上传文件</title>
</head>
<body>
<form action="upload" enctype="multipart/form-data" method="post">
文件名:<input type="text" id="name" name="name"/><br/>
选择文件:<input type="file" id="file" name="file"/><br/>
<input type="submit" value="上传"/>
</form>
</body>
</html>
java端代码：
package com.lee.upload;
import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Collection;
import javax.servlet.ServletException;
import javax.servlet.annotation.MultipartConfig;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.Part;
@WebServlet(name="upload",urlPatterns="/upload")
@MultipartConfig
public class UploadServlet extends HttpServlet {
@Override
protected void service(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
resp.setContentType("text/html;charset=UTF-8");
PrintWriter out=resp.getWriter();
String filename=req.getParameter("name");
Part part=req.getPart("file");
out.println("上传的文件类型为"+part.getContentType()+"<br/>");
out.println("上传的文件大小为:"+part.getSize());
Collection<String> headerNames=part.getHeaderNames();
for (String headname : headerNames) {
out.println(headname+"--->"+part.getHeader(headname)+"<br/>");
}
File f=new File(getServletContext().getRealPath("/uploadFiles"));
f.mkdir();
part.write(getServletContext().getRealPath("/uploadFiles")+"/"+filename);
}
}
