文件上传：使用part.write抛出的异常 IOException：Unexpected output data （外层）和 sun.nio.fs.WindowsException：系统找不到指定的路径（内层）
原因是我要测试文件上传到h20230214_2_war_exploded工程目录的upload目录下，一开始没有创建upload这个目录，我以为它会自己创建，因为之前使用输出流都是会自己创建没有的目录的。
报错代码
jsp
<%--
Created by IntelliJ IDEA.
User: 19762
Date: 2023/2/14
Time: 18:02
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 action="uploadTest" method="post" enctype="multipart/form-data">
<input type="text" name="username" value="中国">
<br>
<input type="text" name="password" value="中国人">
<br>
<input type="file" name="uploadFile">
<br>
<input type="file" name="uploadFile">
<br>
<input type="file" name="uploadFile">
<br>
<input type="submit" value="submit">
</form>
</body>
</html>
servlet
package com.lijianhua;
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.IOException;
import java.io.InputStream;
import java.text.SimpleDateFormat;
import java.util.Collection;
import java.util.Date;
@WebServlet(name = "UploadTest", value = "/uploadTest")
@MultipartConfig
public class UploadTest extends HttpServlet {
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
String username = request.getParameter("username");
String password = request.getParameter("password");
System.out.println(username + " " + password);
//取得上传的目标路径
String uploadPath = this.getServletContext().getRealPath("/upload");
System.out.println(uploadPath);
//处理日期
SimpleDateFormat sdf = new SimpleDateFormat("yyyy_MM_dd_HH_mm_ss");
Collection<Part> parts =
request.getParts();
for (Part part : parts) {
InputStream fileContent = part.getInputStream();
if (part.getSubmittedFileName() != null) {
String uploadFileName = sdf.format(new Date());
uploadFileName += "_" + System.currentTimeMillis() + "_"
+ Math.random() + "_" + part.getSubmittedFileName();
uploadFileName = uploadPath + "\\" + uploadFileName;
part.write(uploadFileName); //报错位置
}
fileContent.close();
}
}
}
结果报错了
上网查不到结果，我就开始debug到深层
结果只是系统找不到指定的路径，我猜是没有创建upload文件夹，创建后就解决了
