SpringBoot2.x实现文件上传与下载

绝地灬酷狼 2022-05-21 11:29 136阅读 0赞

#### 1，配置pom文件 ####

<?xml version="1.0" encoding="UTF-8"?>
    <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
        <modelVersion>4.0.0</modelVersion>
    
        <groupId>com.itpengwei</groupId>
        <artifactId>springboot-test</artifactId>
        <version>0.0.1-SNAPSHOT</version>
        <packaging>jar</packaging>
    
        <name>springboot-test</name>
        <description>Demo project for Spring Boot</description>
    
        <parent>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-parent</artifactId>
            <version>2.0.3.RELEASE</version>
            <relativePath/> 
        </parent>
    
        <properties>
            <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
            <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
            <java.version>1.8</java.version>
        </properties>
    
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
            </dependency>
            
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-thymeleaf</artifactId>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-test</artifactId>
                <scope>test</scope>
            </dependency>
        </dependencies>
    
        <build>
            <plugins>
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                </plugin>
            </plugins>
        </build>
    
    
    </project>

#### 2，配置文件(application.yml) ####

server:
      port: 8080
    spring:
      thymeleaf:
        cache: false
      servlet:
        multipart:
          max-file-size: 5Mb
          max-request-size: 10Mb

#### 3,Controller ####

package com.itpengwei.springboottest.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.bind.annotation.ResponseBody;
    import org.springframework.web.multipart.MultipartFile;
    
    import javax.servlet.http.HttpServletResponse;
    import java.io.*;
    
    /**
     * 文件上传,下载类
     */
    @Controller
    public class FileUploadController {
        /**
         * 文件上传
         *
         * @param file
         * @return
         */
        @PostMapping(value = "/fileUpload")
        @ResponseBody
        public String fileUpload(@RequestParam("fileName") MultipartFile file) {
            if (file.isEmpty()) {
                return "请选择一个文上传";
            }
            String filename = file.getOriginalFilename();
            long fileSize = file.getSize();
            System.out.println("文件名称" + filename + "-------文件大小" + fileSize);
            String path = "F:/test";
            File dest = new File(path + "/" + filename);
            if (!dest.getParentFile().exists()) {
                //父目录不存在就创建一个
                dest.getParentFile().mkdir();
            }
            //保存文件
            try {
                file.transferTo(dest);
                return "文件上传成功";
            } catch (IOException e) {
                e.printStackTrace();
                return "文件上传失败";
            }
        }
    
        /**
         * 文件下载
         *
         * @param response
         * @return
         */
        @RequestMapping(value = "/fileDownload")
        @ResponseBody
        public String download(HttpServletResponse response) {
            String fileName = "Cloud总结.docx";
            String filepath = "F:/test";
            File file = new File(filepath + "/" + fileName);
            byte[] buff = new byte[1024];
            BufferedInputStream bis = null;
            OutputStream os = null;
            try {
                os = response.getOutputStream();
                bis = new BufferedInputStream(new FileInputStream(file));
                int i = bis.read(buff);
                while (i != -1) {
                    os.write(buff, 0, buff.length);
                    os.flush();
                    i = bis.read(buff);
                }
            } catch (IOException e) {
                e.printStackTrace();
                return "文件上传失败";
            } finally {
                if (bis != null) {
                    try {
                        bis.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            }
            return "文件上传成功";
        }
    }

#### 4，启动项目，就实现了文件上传与下载 ####