Spring文件上传三种形式演示v1.0

Spring上传文件

工作中用的最多的就是上传，目前上传大概有三种形式:单文件,多文件,Base64三种形态，spring借助于commons-fileupload来实现以上三种形态，是非常简单的一件事情。

添加依赖

 
 commons-fileupload
 commons-fileupload
 1.4
 
 ​

Spring是通过MultipartFile file 来接收文件，通过MultipartFile[] files接收多个文件

实操

编写静态页面

<%@ page language="java" contentType="text/html; charset=UTF-8"
 pageEncoding="UTF-8"%>
 
 
 
 
 
 
 
 
上传Deme
 

 

 

 单文件上传：
 
 
 
 
 
 
 
 
 
 
批量上传Demo
 
 
 
 
 
 
 action="/uploads/upload2"> 
 
 
 
 
  
 
 
 
 
 
 
 
 文件2： 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Base64文件上传
 
 
 
 
 
 
 
 
 
 
 
 BASE64编码： 
 
  
 
 
 
 
 
 
 
 
 
 
  
 
 

增加展示视图

优雅的显示页面

 public void addViewControllers(ViewControllerRegistry registry) {
 // TODO Auto-generated method stub
 registry.addViewController("/upload").setViewName("upload");
 WebMvcConfigurer.super.addViewControllers(registry);
 }

修改默认上传限制

 @Bean
 public MultipartResolver multipartResolver() {
 CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver();
 multipartResolver.setMaxUploadSize(10000000);
 return multipartResolver;
 }

编写控制器

package com.haojishu.demo.web;
 ​
 import java.io.File;
 import java.io.IOException;
 import java.util.Arrays;
 import java.util.Date;
 ​
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 ​
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Controller;
 import org.springframework.util.Base64Utils;
 import org.springframework.util.FileCopyUtils;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RequestParam;
 import org.springframework.web.bind.annotation.ResponseBody;
 import org.springframework.web.multipart.MultipartFile;
 ​
 ​
 /**
 
 
 
  
@ClassName: UploadController
 
  
@Description:演示上传文件的各种操作
 
  
@author: 心肝宝贝
 
  
@date: 2019年5月25日 下午5:51:10
 
  
 
 
  
@Copyright: 2019 www.haojishu.com Inc. All rights reserved.
 
  
注意：本内容仅限于公司内部传阅，禁止外泄以及用于其他的商业目
 */
 @Controller
 public class UploadController {
 
 
 
 
@Autowired
 private HttpServletRequest request;
 
 
/**
 
 
 
  
@Title: oneUpload
 
  
@Description: 单文件上传演示
 
  
@param: @param file
 
  
@param: @return
 
  
@param: @throws IllegalStateException
 
  
@param: @throws IOException
 
  
@return: String
 
  
@throws
 */
 @RequestMapping(value ="/upload/oneUpload",produces = "application/json;charset=utf-8")
 @ResponseBody
 public String oneUpload(@RequestParam("file") MultipartFile file) throws IllegalStateException, IOException{
 if (file.isEmpty()) {
 System.out.println("上传文件为空");
 return "上传文件不能为空";
 }else {
 System.out.println("开始上传");
 String path = request.getServletContext().getRealPath("/upload");
 File isFile = new File(path);
 if (!isFile.exists()) {
 isFile.mkdirs();
 }
 file.transferTo(new File(path, new String(file.getOriginalFilename().getBytes("ISO-8859-1"), "UTF-8")));
 return "上传成功" + path;
 }
 }
 
 
 
 
/**
 
 
 
  
@Title: multipleUpload
 
  
@Description: 多文件上传
 
  
@param: @param files
 
  
@param: @return
 
  
@param: @throws IllegalStateException
 
  
@param: @throws IOException
 
  
@return: String
 
  
@throws
 */
 @RequestMapping(value ="/upload/multiple",produces = "application/json;charset=utf-8")
 @ResponseBody
 public String multipleUpload(@RequestParam("file") MultipartFile[] files) throws IllegalStateException, IOException{
 if (files.length<1) {
 System.out.println("上传文件为空");
 return "上传失败";
 }else {
 System.out.println("开始上传");
 String path = request.getServletContext().getRealPath("/upload");
 File isFile = new File(path);
 if (!isFile.exists()) {
 isFile.mkdirs();
 }
 for (MultipartFile file : files) {
 file.transferTo(new File(path, new String(file.getOriginalFilename().getBytes("ISO-8859-1"), "UTF-8")));
 }
 return "上传成功" + path;
 }
 }
 
 
 
 
@RequestMapping(value ="/upload/base64",produces = "application/json;charset=utf-8")
 @ResponseBody
 public String base64Upload(String base64) throws Exception {
 String[] fileArray = base64.split("base64,");
 final byte[] bytes = Base64Utils.decodeFromString(fileArray.length > 1 ? fileArray[1] : fileArray[0]);
 String path = request.getServletContext().getRealPath("/upload");
 File isFile = new File(path);
 if (!isFile.exists()) {
 isFile.mkdirs();
 }
 ​
 String suffix = "";
 if("data:image/jpg;".equalsIgnoreCase(fileArray[0])){
 suffix = ".jpg";
 }else{
 throw new Exception("上传图片格式不合法" + fileArray[0]);
 }
 File tempFile = new File(path + "/" + new Date().getTime() + suffix);
 FileCopyUtils.copy(bytes, tempFile);
 return "文件上传成功"+ path;
 }
 
 
}