servlet 3 文件上传

1.up.jsp

<%@ page language="java" pageEncoding="utf-8"%>
<form action="upload.do" method="post" enctype="multipart/form-data">
content:<input type="text" name="content" value="中国人"><br>
file:<input type="file" name="file1"/><br>
file:<input type="file" name="file2"/><br>
file:<input type="file" name="file3"/><br>
<input type="submit" value="上传文件"/>
</form>

2.Upload.java

package com;

import java.io.IOException;
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;

@MultipartConfig()
@WebServlet("/upload.do")
public class Upload extends HttpServlet {
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
// 单文件
// resp.setContentType("text/html;charset=utf-8");
// Part part = req.getPart("file");
// String c = req.getParameter("content");
// c = new String(c.getBytes("iso8859-1"),"utf-8");
// resp.getWriter().print(c);
// String f = part.getHeader("content-disposition");
// 获取文件名
// String fn = f.substring(f.lastIndexOf("=")+2,f.length()-1);
// System.out.println(part.getName());
// System.out.println(part.getSize());//文件大小
// System.out.println(part.getContentType());//文件类型
// part.write(req.getServletContext().getRealPath("upload")+"/"+fn);
// 多文件
//for (Part p : req.getParts()) {
//    if (p.getContentType()!=null) {
//        String f = p.getHeader("content-disposition");
//        String fn = f.substring(f.lastIndexOf("=") + 2, f.length() - 1);
//        p.write(req.getServletContext().getRealPath("upload")+"/"+fn);
//    }
//}
}
}