学习文件上传
2018-07-14 本文已影响0人
小猪Harry
D:\Users\Think\IdeaProjects\FileUploadDemo\out\artifacts\FileUploadDemo_war_exploded
该路径下放的是web文件夹下运行tomcat后的编译后输出文件。
image.png
image.png
一个小例子，说明文件上传的原理。
<%--
Created by IntelliJ IDEA.
User: Think
Date: 2018/7/14
Time: 0:06
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>$Title$</title>
</head>
<body>
<%--form里面的配置需要注意--%>
<form method="post" action="${pageContext.request.contextPath}/upload.do" enctype="multipart/form-data">
<img src="${pageContext.request.contextPath}/upload/${picpath}">
<input type="text" name="text1">
<input type="file" name="file1">
<input type="submit" value="提交">
</form>
</body>
</html>
package com.zhu.servlet;
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 java.io.File;
import java.io.IOException;
import java.util.UUID;
/**
* Created by Think on 2018/7/14.
*/
@WebServlet(name = "uploadServlet",urlPatterns = "/upload.do")
@MultipartConfig //这句话的配置必须加上
public class uploadServlet extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
String username = request.getParameter("text1");
Part part = request.getPart("file1");
System.out.println(username);
String filename = part.getSubmittedFileName();
System.out.println(filename);//此文件名还未加UUID
UUID uuid = UUID.randomUUID();
// d:\Users\Think\IdeaProjects\FileUploadDemo\out\artifacts\FileUploadDemo_war_exploded 部署目录
// d:\Users\Think\IdeaProjects\FileUploadDemo\ 开发目录（源代码所在目录）
String strPath = request.getServletContext().getRealPath("") + "upload" + File.separator;
System.out.println(strPath);
part.write(strPath+uuid+filename);
request.getSession().setAttribute("picpath",uuid+filename);
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
}
}
运行结果：
image.png
image.png
