番外-上传下载

SpringBoot上传下载

1、启动类配置
//排除原有的Multipart配置
@EnableAutoConfiguration(exclude = {MultipartAutoConfiguration.class})
2、上传大小配置类
package com.mf.config;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.multipart.MultipartResolver;
import org.springframework.web.multipart.commons.CommonsMultipartResolver;


@Configuration
public class UploadConfig {
    //显示声明CommonsMultipartResolver为mutipartResolver
    @Bean(name = "multipartResolver")
    public MultipartResolver multipartResolver() {
        CommonsMultipartResolver resolver = new CommonsMultipartResolver();
        resolver.setDefaultEncoding("UTF-8");
        //resolveLazily属性启用是为了推迟文件解析，以在在UploadAction中捕获文件大小异常
        resolver.setResolveLazily(true);
        resolver.setMaxInMemorySize(40960);
        //上传文件大小 5M 5*1024*1024
        resolver.setMaxUploadSize(5 * 1024 * 1024);
        return resolver;
    }

}

3、前端

        <form action="/upload/test" method="post" enctype="multipart/form-data">
            <input type="file" name="fileTest"/>
            <input type="submit" value="上传"/>
        </form>

4、controller

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.multipart.MultipartFile;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import java.io.File;
import java.io.IOException;
/**
 * 作业
 */
@Controller
@RequestMapping("/upload")
public class ZuoyeController {
    private static final Logger LOGGER = LoggerFactory.getLogger(ZuoyeController.class);

    @GetMapping("/upload")
    public String upload() {
        return "upload";
    }

    @PostMapping("/test")
    @ResponseBody
    public String upload(@RequestParam("fileTest") MultipartFile fileTest) {
        String fileName = fileTest.getOriginalFilename();
        System.out.println(fileName);
        String filePath = "d:\\upload\\";
        File dest = new File(filePath + fileName);
        try {
            fileTest.transferTo(dest);
            LOGGER.info("上传成功");
            return "上传成功";
        } catch (IOException e) {
            LOGGER.error(e.toString(), e);
        }
        return "上传失败！";
    }


}