java 8 上传文件小例子报错！

Question

查了类似错误，都是没有判断：是否创建路径（如下代码），添加了

if(!tempDirectory .exists()){
    tempDirectory .mkdirs();
}

最终如下，但还是报错。

File tempDirectory = new File("d:\\tempDirectory");
if(!tempDirectory .exists()){
    tempDirectory .mkdirs();
}
 factory.setRepository(tempDirectory);

错误信息如下：

HTTP Status 500 – Internal Server Error


Type Exception Report

Message d:\files\D:\AAA.zip (文件名、目录名或卷标语法不正确。)

Description The server encountered an unexpected condition that prevented it from fulfilling the request.

Exception
java.io.FileNotFoundException: d:\files\D:\AAA.zip (文件名、目录名或卷标语法不正确。)
    java.io.FileOutputStream.open0(Native Method)
    java.io.FileOutputStream.open(Unknown Source)
    java.io.FileOutputStream.<init>(Unknown Source)
    java.io.FileOutputStream.<init>(Unknown Source)
    com.atguigu.fileupload.servlet.UploadServlet.doPost(UploadServlet.java:80)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:660)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)


Note The full stack trace of the root cause is available in the server logs.


Apache Tomcat/9.0.17

UploadServlet 如下：

package com.atsf.fileupload.servlet;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.List;

import javax.servlet.ServletException;
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;

public class UploadServlet extends HttpServlet {

    private static final long serialVersionUID = 1L;

    protected void doPost(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException {

        // 1. 得到 FileItem 的集合 items
        // Create a factory for disk-based file items
        DiskFileItemFactory factory = new DiskFileItemFactory();
        
        // Set factory constraints
        factory.setSizeThreshold(1024 * 500);
        File tempDirectory = new File("d:\\tempDirectory");
        factory.setRepository(tempDirectory);

        // Create a new file upload handler
        ServletFileUpload upload = new ServletFileUpload(factory);

        // Set overall request size constraint
        upload.setSizeMax(1024 * 1024 * 5);

        // Parse the request
        try {
            List<FileItem> /* FileItem */items = upload.parseRequest(request);

            // 2. 遍历 items:
            for (FileItem item : items) {
                // 若是一个一般的表单域, 打印信息
                if (item.isFormField()) {
                    String name = item.getFieldName();
                    String value = item.getString();

                    System.out.println(name + ": " + value);
                    
                    
                }
                // 若是文件域则把文件保存到 d:\\files 目录下.
                else {
                    String fieldName = item.getFieldName();
                    String fileName = item.getName();
                    String contentType = item.getContentType();
                    long sizeInBytes = item.getSize();

                    System.out.println(fieldName);
                    System.out.println(fileName);
                    System.out.println(contentType);
                    System.out.println(sizeInBytes);

                    InputStream in = item.getInputStream();
                    byte[] buffer = new byte[1024];
                    int len = 0;

                    fileName = "d:\\files\\" + fileName;
                    System.out.println(fileName);

                    OutputStream out = new FileOutputStream(fileName);

                    while ((len = in.read(buffer)) != -1) {
                        out.write(buffer, 0, len);
                    }

                    out.close();
                    in.close();
                }
            }

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

    }

}

解决了，因为浏览器上传路径不同导致，将文件名前面的路径截掉即可，如下代码:
fileName = fileName.substring(fileName.lastIndexOf("\")+1);

Answer 1

解决了，因为浏览器上传路径不同导致，将文件名前面的路径截掉即可，如下代码:
fileName = fileName.substring(fileName.lastIndexOf("")+1);

感谢各位朋友！