Java文件上传处理-优快云博客

本文链接：https://blog.youkuaiyun.com/qq_42709766/article/details/104004438

package com.zl.file.operater;

import java.io.File;
import java.io.IOException;
import java.util.List;
import java.util.UUID;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

@WebServlet("/fileUploadTest")
public class FileUploadTest extends HttpServlet {
	private static final long serialVersionUID = 1L;

	@Override
	protected void service(HttpServletRequest rq, HttpServletResponse rp) throws ServletException, IOException {
		rq.setCharacterEncoding("utf-8");
		rp.setContentType("text/html;charset=utf-8");

		// 1、获取磁盘文件工厂
		DiskFileItemFactory dfif = new DiskFileItemFactory();
		// 2、获取文件上传处理解析器
		ServletFileUpload sfu = new ServletFileUpload(dfif);
		// 3、解析request中的信息
		try {
			List<FileItem> list = sfu.parseRequest(rq);
			// 找到文件上传的文本域
			for (FileItem fileItem : list) {
				if (!fileItem.isFormField()) {
					// 获取上传的内容的名称或路径
					String filecontent = fileItem.getName();
					System.out.println(filecontent);
					// 截取文件名
					String filename = filecontent.substring(filecontent.lastIndexOf(File.pathSeparator) + 1);
					// 解决文件名相同会覆盖的问题
					UUID uuid = UUID.randomUUID();
					// 写出文件
					// 创建存储文件的目录
					File fileDir = new File("E:/img");
					if (!fileDir.exists()) {
						System.out.println("文件夹创建成功！");
						fileDir.mkdirs();
					}
					String path = "E:/img" + File.separator + uuid + filename;
					File file = new File(path);
					try {
						fileItem.write(file);
						// 显示到页面
						rq.setAttribute("filename", uuid + filename);
						rq.getRequestDispatcher("fileUpload.jsp").forward(rq, rp);
					} catch (Exception e) {

						e.printStackTrace();
					}
				}
			}
		} catch (FileUploadException e) {

			e.printStackTrace();
		}
	}
}

<%@ 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="fileUploadTest" method="post" enctype="multipart/form-data">
        用户名：<input type="text" name="username"/>
   密码：<input type="file" name="file"/><br/>
   <input type="submit" value="提交"/>
    </form>
    <img alt="" src="/upload/${filename}">
</body>
</html>

浏览器向服务器上传文件