Tomcat 9 实现文件上传_tomcat9 servletfileupload-优快云博客

本文链接：https://blog.youkuaiyun.com/xiaoyustudiowww/article/details/145583576

===========jsp文件
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Tomcat 9 文件上传</title>
</head>
<body>
文件上传至服务器
<form action="${pageContext.request.contextPath}/smallRianFileup"
method="post" enctype="multipart/form-data">
请选择文件：<input type="file" name="smallRianFile" width="120"
height="120"><br>
<input type="submit" value="提交" width="120" height="120">
</form>
</body>

===============java文件
package org.rain.servlet;

import java.io.File;
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;

@WebServlet("/smallRianFileup")
@MultipartConfig
public class SmallRainFileUp extends HttpServlet {
   protected void doPost(HttpServletRequest request,
HttpServletResponse response)
           throws ServletException, IOException {
       // 上传文件的保存路径
       String savePath = "C:/SmallRian";

       try {
           // 创建保存目录（如果不存在）
           File fileSaveDir = new File(savePath);
           if (!fileSaveDir.exists()) {
               fileSaveDir.mkdir();
           }

           // 获取上传文件名
           Part filePart = request.getPart
("smallRianFile");
           String fileName = filePart.getSubmittedFileName
();

           // 将part内容写到文件夹内，生成一个文件
           String localFile = savePath + "/" + fileName;
           if (null != fileName && fileName.length() > 0 &&
filePart.getSize() > 0) {
               // 写入本地文件
               filePart.write(localFile);
           }
           // 上传成功浏览器显示
           response.setCharacterEncoding("UTF-8");
           PrintWriter out = response.getWriter();
           String shead = new String(
                   "<head> <meta http-equiv=
\"content-type\" content=\"text/html;charset=utf-8\"> </head>");
           out.println("<html>");
           out.println(shead);
           out.println("<title>文件上传成功</title>");
           out.println("<body>");
           out.println("<h3>" + fileName + " 上传成功" + "
</h3>");
           out.println("</body>");
           out.println("</html>