一、第一步，

第一步依然是创建数据库，我简单设计了三个字段(file_id，file_name，create_time)

CREATE TABLE `txtfile` (`file_id` int NOT NULL AUTO_INCREMENT,`file_name` varchar(45) NOT NULL,`create_time` varchar(45) NOT NULL,PRIMARY KEY (`file_id`)
) ENGINE=InnoDB AUTO_INCREMENT=15 DEFAULT CHARSET=utf8mb3

然后springboot配置文件

application.yml

mybatis:configuration:map-underscore-to-camel-case: truelog-impl: org.apache.ibatis.logging.stdout.StdOutImplmapper-locations: classpath:mapper/*.xmltype-aliases-package: edu.wsm.doamin
spring:datasource:driver-class-name: com.mysql.cj.jdbc.Driverurl: jdbc:mysql://127.0.0.1/somefile?useUnicode=true&characterEncoding=utf8username: rootpassword: rootthymeleaf:cache: falseencoding: utf-8prefix: classpath:templates/suffix: .htmlcheck-template: trueservlet:content-type: text/htmlcheck-template-location: true
server:port: 80

maven包管理

pom.xml

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.6.1</version><relativePath/> <!-- lookup parent from repository --></parent><groupId>edu.wsm</groupId><artifactId>fileup-download</artifactId><version>0.0.1-SNAPSHOT</version><name>fileup-download</name><description>fileup-download</description><properties><java.version>1.8</java.version></properties><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-data-redis</artifactId></dependency><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><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-devtools</artifactId></dependency><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId></dependency><dependency><groupId>org.mybatis.spring.boot</groupId><artifactId>mybatis-spring-boot-starter</artifactId><version>2.1.4</version></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-test</artifactId></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-test</artifactId></dependency><dependency><groupId>junit</groupId><artifactId>junit</artifactId></dependency></dependencies><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins></build></project>

二、第二部，

接着实现代码，依然采用经典的MVC结构，代码实现如下：

1.实体类domain

SomeFile.java

package edu.wsm.domain;import lombok.Data;
import lombok.NoArgsConstructor;
import java.util.Date;/*** @ClassName SomeFile* @Description TODO* @Author Deer·Wang* @Date 2021/12/11 13:11* @Version 1.0**/
@Data
@NoArgsConstructor
public class SomeFile {private Integer fileId;private String fileName;private String createTime;
}

2.dao层

FileOperation.java

package edu.wsm.dao;import edu.wsm.domain.SomeFile;
import org.apache.ibatis.annotations.Mapper;import java.util.List;/*** @ClassName FileOperation* @Description TODO* @Author Deer·Wang* @Date 2021/12/11 13:13* @Version 1.0**/
@Mapper
public interface FileOperation {public List<SomeFile> select();public void insert(SomeFile someFile);
}

3.service层

FileService.java

package edu.wsm.service;import edu.wsm.dao.FileOperation;
import edu.wsm.domain.SomeFile;
import org.springframework.stereotype.Service;
import org.springframework.web.multipart.MultipartFile;import javax.annotation.Resource;
import java.io.*;
import java.util.List;/*** @ClassName FileService* @Description TODO* @Author Deer·Wang* @Date 2021/12/11 13:16* @Version 1.0**/
@Service
public class FileService {@Resourceprivate FileOperation fileOperation;/*** 查询所有文件* @return */public List<SomeFile> searchAll(){List<SomeFile> fileList = fileOperation.select();return fileList;}/*** 添加文件* @param someFile SomeFile类对象* @param multipartFile 前端上传的文件*/public void add(SomeFile someFile, MultipartFile multipartFile){if(multipartFile!=null){try {multipartFile.transferTo(new File("这里写你文件存储的路径"+multipartFile.getOriginalFilename()));} catch (IOException e) {e.printStackTrace();}fileOperation.insert(someFile);}}
}

4.Mapper文件

FileOperationMapper.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapperPUBLIC "-//mybatis.org//DTD Mapper 3.0//EN""http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="edu.wsm.dao.FileOperation"><resultMap id="fileOperationMap" type="edu.wsm.domain.SomeFile"><id column="file_id" property="fileId" javaType="java.lang.Integer"></id><result column="file_name" property="fileName" javaType="java.lang.String"></result></resultMap><select id="select" resultMap="fileOperationMap">select * from txtfile</select><insert id="insert">insert into txtfile (file_name,create_time) values (#{fileName},#{createTime})</insert>
</mapper>

5.controller层

FileController.java

package edu.wsm.controller;import edu.wsm.domain.SomeFile;
import edu.wsm.service.FileService;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.multipart.MultipartFile;
import javax.annotation.Resource;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.time.LocalDateTime;
import java.util.List;/*** @ClassName FileController* @Description TODO* @Author Deer·Wang* @Date 2021/12/11 13:17* @Version 1.0**/
@Controller
@RequestMapping("/file")
public class FileController {@Resourceprivate FileService fileService;/*** 查询文件并把文件集合传给showFile.html* @param model* @return*/@RequestMapping("/search")public String search(Model model){List<SomeFile> fileList = fileService.searchAll();model.addAttribute("fileList",fileList);return "showFile";}/*** 接收游览器上传的文件并做处理* @param file* @param model* @return* @throws IOException*/@PostMapping("/add")public String add(MultipartFile file,Model model) throws IOException {//判断上传的文件是否为空if(!file.isEmpty()){SomeFile someFile = new SomeFile();LocalDateTime localDateTime = LocalDateTime.now();someFile.setFileName(file.getOriginalFilename());someFile.setCreateTime(localDateTime.toLocalDate()+" "+localDateTime.toLocalTime());fileService.add(someFile,file);}else {model.addAttribute("error","文件不存在或文件过大或格式不对");}return "redirect:/file/search";}/*** 下载文件* @param response 响应* @param fileName 要下载的文件名* @throws IOException*/@PostMapping("/download")public void download(HttpServletResponse response, String fileName) throws IOException {//从服务器本地读取文件File file = new File("这里填你文件存储的路径"+fileName);//判断文件是否存在if(!file.exists()){response.sendError(404,"你下载的资源不存在!!!");}BufferedInputStream bis = new BufferedInputStream(new FileInputStream(file));//响应输出流OutputStream outputStream = response.getOutputStream();//设置响应头response.setHeader("content-type", "application/octet-stream");response.setContentType("application/octet-stream");response.setCharacterEncoding("UTF-8");response.setHeader("Content-Disposition", "attachment;fileName=" + fileName);//将文件以流的方式传给前端int i = 0;byte[] buff = new byte[1024];while ((i = bis.read(buff)) != -1) {outputStream.write(buff, 0, i);}bis.close();outputStream.close();}
}

6.View界面

showFile.html

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head><meta charset="UTF-8"><title>信息列表</title>
</head>
<body>
<h1>!!!非常炫酷的View界面!!!</h1>
<h4>!!! 上传文件不要超过10k !!!</h4>
<h4>!!!上传txt格式的文本!!!</h4>
<table border="1px" cellspacing="0" cellpadding="1"><tr><th>文件目录</th><th>时间</th><th>操作</th></tr><tr th:each="files:${fileList}"><td th:text="${files.fileName}"></td><td th:text="${files.createTime}"></td><td>
<!--            <a th:href="@{/file/download}" th:method="post" th:download="${files.fileName}">下载</a>--><form th:action="@{/file/download}" method="post" enctype="multipart/form-data"><input type="hidden" name="fileName" th:value="${files.fileName}"/><input type="submit" value="下载"/></form></td></tr>
</table>
<p>----------------------------</p>
<div style="height: 70px;width: 500px;background-color: #efff43"><form method="post" enctype="multipart/form-data" th:action="@{/file/add}"><input type="file" name="file" value=""/>| <input type="submit" value="上传"></form>
</div>
</body>
</html>

error.html

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head><meta charset="UTF-8"><title>Title</title>
</head>
<body>
<h1>!!!资源有误!!!</h1>
<p>原因: 1.可能你上传的资源过大或不存在  2.下载的资源不存在</p>
<a th:href="@{/file/search}">点此返回</a>
</body>
</html>

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