springboot实现图片（文件）上传的两种方式

悠悠 2022-04-17 00:18 265阅读 0赞

package com.deepwise.deepwise.controller;
    
    import org.apache.commons.io.FileUtils;
    import org.springframework.web.bind.annotation.*;
    import org.springframework.web.multipart.MultipartFile;
    
    import java.io.*;
    import java.nio.file.Files;
    import java.nio.file.Paths;
    import java.nio.file.StandardCopyOption;
    
    /**
     * @author zlw
     * @date 2018/11/9
     * @description
     */
    @RestController
    public class MyController {
    
        private static final String PATH = "/images6666";
        private static final int MAX_IMAGE_NUM = 500;
    
        @RequestMapping(value = "/doUpload", method = RequestMethod.POST)
        public Integer upload(@RequestParam("file") MultipartFile file) throws IOException {
    
            File folder = new File(PATH);
            if (countFileNumber(folder) > MAX_IMAGE_NUM) {
                return MAX_IMAGE_NUM;
            }
            
            if (!file.isEmpty()) {
                String fileName = file.getOriginalFilename();
                InputStream is = file.getInputStream();
    
                if(!folder.exists()){
                    folder.mkdir();
                }
                /*
                //方式一
                Files.copy(is, Paths.get(folder.getAbsolutePath() + File.separator + fileName),
                        StandardCopyOption.REPLACE_EXISTING);
                */
                //========================
                //方式二
                File uploadFile = new File(folder.getAbsolutePath() + File.separator + fileName);
                try (BufferedOutputStream outputStream = new BufferedOutputStream(
                        new FileOutputStream(uploadFile))) {
                    outputStream.write(file.getBytes());
                }
                //========================
            } 
            return countFileNumber(folder);
        }
    
        /**
         * 统计当前目录下的文件个数
         * @param directory，这里的参数也可以换成string类型，直接给出文件夹路径
         * @return
         */
        private int countFileNumber(File directory){
            if (!directory.isDirectory()){
                return 0;
            }
            return directory.listFiles().length;
        }
    
    }

package com.deepwise.deepwise.config;
    
    import org.springframework.boot.web.servlet.MultipartConfigFactory;
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.Configuration;
    import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
    
    import javax.servlet.MultipartConfigElement;
    
    /**
     * @author zlw
     * @date 2018/11/9
     * @description
     */
    @Configuration
    public class ImageConfig extends WebMvcConfigurerAdapter {
        @Bean
        public MultipartConfigElement multipartConfigElement(){
            MultipartConfigFactory factory = new MultipartConfigFactory();
            //文件最大KB,MB
            factory.setMaxFileSize("2MB");
            //设置总上传数据总大小
            factory.setMaxRequestSize("10MB");
            return factory.createMultipartConfig();
        }
    }