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使用Servlet实现文件上传

2017-02-27 17:42 295 查看

在Servlet3.0以后可以非常方便实现文件上传了，实现文件上传需要以下两项内容

1、需要添加@MultipartConfig配置

2、从request对象中获取Part文件对象

MultipartConfig属性如下：

UploadServlet：

package com.home.web.servlet;

import java.io.IOException;
import java.io.PrintWriter;

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;

import org.apache.catalina.core.ApplicationPart;

/**
* Servlet implementation class UploadServlet
*/
@WebServlet("/UploadServlet")
@MultipartConfig(location = "e:/tmp")
public class UploadServlet extends HttpServlet {
private static final long serialVersionUID = 1L;

/**
* @see HttpServlet#HttpServlet()
*/
public UploadServlet() {
super();
}

/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
}

/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
String path = getServletContext().getRealPath("/");
Part p = request.getPart("file1");
if (p.getContentType().contains("image")) {
ApplicationPart ap = (ApplicationPart) p;
String fname1 = ap.getFilename();
String fname2 = fname1.substring(fname1.lastIndexOf("\\") + 1, fname1.length());
p.write(path + "/upload/" + fname2);
out.write("文件上传成功：" + path + "/upload/" + fname2);
} else {
out.write("目前只支持上传图片！");
}
}

}

index.jsp：

<%@page import="java.net.URLDecoder"%>
<%@ 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>文件上传</title>
</head>
<body>

<form action="UploadServlet" method="post"
enctype="multipart/form-data">
选择文件<input type="file" name="file1" id=file1 /> <input type="submit"
name="upload" value="上传" />
</form>

</body>
</html>

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