[JAVA/JSP] Java实现多文件上传功能

• commons-fileupload
• smartupload+ R. D6 L* s" t2 o
  

• fileSizeThreshold 内存缓存的最大空间(当上传文件的字节数达到该值后使用临时文件缓存)
• location 临时文件的存储目录
• maxFileSize 允许上传的单个文件的最大限制
• maxRequestSize 表单允许提交的总字节数
  % k! |, t7 x- Z; @

复制代码
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
 <form action="upload3" method="post" enctype="multipart/form-data">
  <input type="text" name="fname" placeholder="请输入文件名" /> <br />
  <input type="file" name="myfile" multiple/>
  <button>上传</button>
 </form>
</body>
</html>

复制代码
package com.softeem.servlet;
 
import java.io.File;
import java.io.IOException;
import java.util.Collection;
import java.util.UUID;
 
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({ "/UploadServlet", "/upload" })
@MultipartConfig(
  //设置内存缓存的最大空间（当上传文件的字节数达到该值后使用临时文件缓存）
  fileSizeThreshold=1024*1024,
  //设置临时文件的存储目录
  location="d:/temp",
  //设置允许上传的单个文件的最大限制
  maxFileSize=1024*1024*200,
  //设置表单的最大允许提交的字节数
  maxRequestSize=1024*1024*500
  )
public class UploadServlet extends HttpServlet {
 private static final long serialVersionUID = 1L;
        
 protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
   
  String basePath = "d:/myfileserver";
  Collection<Part> parts = request.getParts();
  for(Part part:parts){
   if(part.getSize() > 0){
    String fname = part.getSubmittedFileName();
    //随机产生一个uuid作为文件名称
    String uuid = UUID.randomUUID().toString();
    //获取文件后缀
    String suffix = fname.substring(fname.lastIndexOf("."));
    //组合uuid和文件后缀成为新的文件名称
    fname = uuid+suffix;
     
    part.write(basePath+File.separator+fname);
   }
  }
 }
 protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
  // TODO Auto-generated method stub
  doGet(request, response);
 }
 
}