实现图片文件上传保存到本地 MultipartFile

古城微笑少年丶 2023-05-29 02:28 21阅读 0赞

## **MultipartFile** ##

对上传的图片进行处理；

处理大量图片

/\*\*  
     \* 1.判断文件是否为图片        jpg|png|gif  
     \* 2.防止恶意程序                高度和宽度判断  
     \* 3.图片分文件保存           分布式fast|yyyy/MM/dd  
     \* 4.修改文件名称，防止重名          UUID  
     \*/

<%@ page language="java" contentType="text/html; charset=UTF-8"
        pageEncoding="UTF-8"%>
    <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
    <html>
    <head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>Insert title here</title>
    </head>
    <body>
        <h1>实现文件长传</h1>
        
        <form action="http://localhost:80/file" method="post" 
        enctype="multipart/form-data">
            <input name="fileImage" type="file" />
            <input type="submit" value="提交"/>
        </form>
    </body>
    </html>

package com.jt.controller;
    
    import java.io.File;
    import java.io.IOException;
    
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RestController;
    import org.springframework.web.multipart.MultipartFile;
    
    import com.jt.service.FileService;
    import com.jt.vo.EasyUIFile;
    
    @RestController
    public class FileController {
    	@Autowired
    	private FileService fileService;
    	/*
    	 * 1.准备文件存储目录
    	 * 2.获取文件名称
    	 * 3.利用工具API实现文件上传
    	 */
    	@RequestMapping("/file")
    	public String file(MultipartFile fileImage) throws IllegalStateException, IOException {
    		
    		File fileDir = new File("E:/java/img");
    		if(!fileDir.exists()) {
    			//如果没有目录应该创建目录
    			fileDir.mkdirs();
    		}
    		//获取图片名称
    		String imgName = fileImage.getOriginalFilename();
    		String path = "E:/java/img/"+imgName;
    		//文件实现上传
    		fileImage.transferTo(new File(path));
    		return "文件上传成功！";
    	}
    	
    	/**
    	 * 实现商品的文件上传
    	 */
    	@RequestMapping("/pic/upload")
    	public EasyUIFile fileUpload(MultipartFile uploadFile) {
    		return fileService.fileUpload(uploadFile);
    	}
    }

package com.jt.service;
    
    import java.awt.image.BufferedImage;
    import java.io.File;
    import java.io.IOException;
    import java.text.SimpleDateFormat;
    import java.util.Date;
    import java.util.UUID;
    
    import javax.imageio.ImageIO;
    
    import org.springframework.stereotype.Service;
    import org.springframework.web.multipart.MultipartFile;
    
    import com.jt.vo.EasyUIFile;
    
    @Service
    public class FileServiceImpl implements FileService{
    	private String localDir = "E:/java/img/";
    	/**
    	 * 1.判断文件是否为图片		jpg|png|gif
    	 * 2.防止恶意程序    			高度和宽度判断
    	 * 3.图片分文件保存   		分布式fast|yyyy/MM/dd
    	 * 4.修改文件名称，防止重名      	UUID
    	 */
    	@Override
    	public EasyUIFile fileUpload(MultipartFile uploadFile) {
    		EasyUIFile easyUIFile = new EasyUIFile();
    		//1.判断文件是否为图片类型
    		String fileName = uploadFile.getOriginalFilename();
    		fileName = fileName.toLowerCase(); //解决文件名后缀是大写的
    		if(!fileName.matches("^.+\\.(jpg|png|gif)$")) {
    			//表示不满足规则
    			return EasyUIFile.fail();
    		}
    		//2.判断是否为恶意程序,转化成为图片对象
    		try {
    			BufferedImage bufferedImage = 
    					ImageIO.read(uploadFile.getInputStream());
    			int width = bufferedImage.getWidth();
    			int height = bufferedImage.getHeight();
    			if(width==0||height==0) {
    				return EasyUIFile.fail();
    			}
    			
    			//3.实现份文件存储 按照yyyy/MM/dd
    			String dateDir =
    					new SimpleDateFormat("yyyy/MM/dd/")
    					.format(new Date());
    			//E:/java/img/yyyy/MM/dd
    			String fileDirPath = localDir +dateDir;
    			File dirFile = new File(fileDirPath);
    			if(!dirFile.exists()) {
    				dirFile.mkdirs();
    			}
    			//4.生成文件防止重名 name.type
    			int index = fileName.lastIndexOf(".");
    			String fileType =
    					fileName.substring(index);
    			String uuid = UUID.randomUUID().toString();
    			//拼接文件名称
    			String realFileName = uuid+fileType;
    			//5.文件实现上传
    			uploadFile.transferTo(new File(fileDirPath+realFileName));
    			//暂时使用网络地址代替真正的url地址
    			easyUIFile.setHeight(height)
    					  .setWidth(width)
    					  .setUrl("https://img11.360buyimg.com/n5/s54x54_jfs/"
    				+ "t1/63250/39/14040/164985/5db7ff7cE758e2798/91c7367ccef07bc2.jpg");
    		} catch (IOException e) {
    			e.printStackTrace();
    			return EasyUIFile.fail();
    		}
    		return easyUIFile;
    	}
    
    }