前端js上传文件到后端接收文件

下面是前端js代码：

<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=GB18030">
    <title>File upload</title>
</head>
<body>
<!--  // action="fileupload"对应web.xml中<servlet-mapping>中<url-pattern>的设置. -->
    <form name="myform" action="fileupload" method="post"
       enctype="multipart/form-data">
       File:<br>
       <input type="file" name="myfile"><br>
       <br>
       <input type="submit" name="submit" value="Commit">
    </form>
</body>
</html>

下面是后端的java代码：

package com.zj.sample;

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

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

/**
 * Servlet implementation class Upload
 */
@WebServlet("/Upload")
public class Upload extends HttpServlet {
    private static final long serialVersionUID = 1L;
    private String uploadPath = "D:\temp"; // 上传文件的目录
    private String tempPath = "d:\temp\buffer\"; // 临时文件目录
    File tempPathFile; 
    /**
     * @see HttpServlet#HttpServlet()
     */
    public Upload() {
        super();
        // TODO Auto-generated constructor stub
    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    @SuppressWarnings("unchecked")
    public void doPost(HttpServletRequest request, HttpServletResponse response)
           throws IOException, ServletException {
       try {
           // Create a factory for disk-based file items
           DiskFileItemFactory factory = new DiskFileItemFactory();
 
           // Set factory constraints
           factory.setSizeThreshold(4096); // 设置缓冲区大小，这里是4kb
           factory.setRepository(tempPathFile);// 设置缓冲区目录
 
           // Create a new file upload handler
           ServletFileUpload upload = new ServletFileUpload(factory);
 
           // Set overall request size constraint
           upload.setSizeMax(4194304); // 设置最大文件尺寸，这里是4MB
 
           List<FileItem> items = upload.parseRequest(request);// 得到所有的文件
           Iterator<FileItem> i = items.iterator();
           while (i.hasNext()) {
              FileItem fi = (FileItem) i.next();
              String fileName = fi.getName();
              if (fileName != null) {
                  File fullFile = new File(fi.getName());
                  File savedFile = new File(uploadPath, fullFile.getName());
                  fi.write(savedFile);
              }
           }
           System.out.print("upload succeed");
       } catch (Exception e) {
           // 可以跳转出错页面
           e.printStackTrace();
       }
    }
    public void init() throws ServletException {
        File uploadFile = new File(uploadPath);
        if (!uploadFile.exists()) {
            uploadFile.mkdirs();
        }
        File tempPathFile = new File(tempPath);
         if (!tempPathFile.exists()) {
            tempPathFile.mkdirs();
        }
     }
}

web.xml 的配置

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
  <display-name>tom2</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
  <servlet>
    <servlet-name>Upload</servlet-name>
    <servlet-class>com.zj.sample.Upload</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>Upload</servlet-name>
    <url-pattern>/home/fileupload</url-pattern>
  </servlet-mapping>
</web-app>

文件结构：

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原文地址：https://www.cnblogs.com/huhuuu/p/4294173.html

前端js上传文件 到后端接收文件

前端js上传文件到后端接收文件