1.建立一个File的数据库
CREATE TABLE `sys_file` ( `id` int(11) NOT NULL AUTO_INCREMENT COMMENT 'id', `name` varchar(255) COLLATE utf8mb4_unicode_ci DEFAULT NULL COMMENT '文件名称', `type` varchar(255) COLLATE utf8mb4_unicode_ci DEFAULT NULL COMMENT '文件类型', `size` bigint(20) DEFAULT NULL COMMENT '文件大小(kb)', `url` varchar(255) COLLATE utf8mb4_unicode_ci DEFAULT NULL COMMENT '下载链接', `md5` varchar(255) COLLATE utf8mb4_unicode_ci DEFAULT NULL COMMENT '文件md5', `is_delete` tinyint(1) DEFAULT '0' COMMENT '是否删除', `enable` tinyint(1) DEFAULT '1' COMMENT '是否禁用链接', PRIMARY KEY (`id`) ) ENGINE=InnoDB AUTO_INCREMENT=23 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;Files.sql
这里采用的都是假删除,is_delete如果是true的话就是删除,否则不是删除
2.Files.java和Filesmapper和FileController的建立
这里也可以用代码生成器来生成
Files.java
Filesmapper.java
FilesMapper.xml
Filescontroller
3.Filescontroller中的文件上传,下载和删除
在本地磁盘中要储存的地址,我们采用现在application.yml中定义:然后引入的时候就是这样
//将resources中的application.yml中的路径引入
@Value("${files.upload.path}")
private String fileUploadPath;
这里为什么要用md5呢,就是如果每个文件只是改了一个名字然后在传到本地磁盘中去的话,这个会浪费内存,然后我们就设置了一个md5来标识文件
package com.xxxx.demo.controller; import cn.hutool.core.io.FileUtil; import cn.hutool.core.util.IdUtil; import cn.hutool.core.util.StrUtil; import cn.hutool.crypto.SecureUtil; import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper; import com.baomidou.mybatisplus.extension.plugins.pagination.Page; import com.xxxx.demo.common.Result; import com.xxxx.demo.entity.Files; import com.xxxx.demo.mapper.FileMapper; import org.apache.poi.util.StringUtil; import org.springframework.beans.factory.annotation.Value; import org.springframework.web.bind.annotation.*; import org.springframework.web.multipart.MultipartFile; import javax.annotation.Resource; import javax.servlet.ServletOutputStream; import javax.servlet.http.HttpServletResponse; import java.io.File; import java.io.IOException; import java.net.URLEncoder; import java.util.List; /** * @ClassName FileController * @Description 文件上传 * @Author Lishipu * @Date 2023/1/20 20:23 * Version 1.0 **/ @RestController @RequestMapping("/file") public class FileController { //将resources中的application.yml中的路径引入 @Value("${files.upload.path}") private String fileUploadPath; @Resource private FileMapper fileMapper; /* * @Author lishipu * @Description 文件上传接口 * @Date 20:24 2023/1/20 * @Param 前端传递过来的文件 * @return **/ @PostMapping("/upload") public String upload(@RequestParam MultipartFile file) throws IOException { String originalFilename = file.getOriginalFilename();//获得名字 String type = FileUtil.extName(originalFilename);//获得类型,像.png long size = file.getSize();//获得大小 //定义一个文件唯一的标识码 String uuid = IdUtil.fastSimpleUUID(); String fileUUID=uuid+StrUtil.DOT+type; File uploadFile = new File(fileUploadPath + fileUUID); //先存储到磁盘中去 File ParentFile =uploadFile.getParentFile(); //判断配置的文件目录是否存在,若不存在则创建一个新的文件目录 if(!ParentFile.exists()){ ParentFile.mkdirs(); } String url; //获取文件的Md5,通过对文件的md5,避免上传相同内容的文件 String md5 = SecureUtil.md5(file.getInputStream()); // 从数据库查询是否存在相同的记录 Files dbFiles = getFileByMd5(md5); if (dbFiles != null) { // 文件已存在 url = dbFiles.getUrl(); //由于文件已经存在,所以删除刚才上传的重复的文件 uploadFile.delete(); } else { // 上传文件到磁盘 file.transferTo(uploadFile); // 数据库若不存在重复文件,则不删除刚才上传的文件 url = "http://localhost:9090/file/" + fileUUID; } //储存到数据库中 Files saveFile = new Files(); saveFile.setName(originalFilename); saveFile.setType(type); saveFile.setSize(size/1024); saveFile.setUrl(url); saveFile.setMd5(md5); fileMapper.insert(saveFile);//插入 return url; } /* * @Author lishipu * 文件下载接口 http://localhost:9090/file/{fileUUID} * @Description 文件的下载 * @Date 21:16 2023/1/20 * @Param * @return **/ //fileUUID是uuid加点加类型 @GetMapping("/{fileUUID}") public void download(@PathVariable String fileUUID,HttpServletResponse response) throws IOException { // 根据文件的唯一标识码获取文件 File uploadFile = new File(fileUploadPath + fileUUID); // 设置输出流的格式 ServletOutputStream os = response.getOutputStream(); response.addHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileUUID, "UTF-8")); response.setContentType("application/octet-stream"); // 读取文件的字节流 os.write(FileUtil.readBytes(uploadFile)); os.flush(); os.close(); } /** * @Author lishipu * @Description 通用文件的md5查询文件‘ * @Date 21:43 2023/1/20 * @Param [md5] * @return com.xxxx.demo.entity.Files **/ private Files getFileByMd5(String md5) { // 查询文件的md5是否存在 QueryWrapper<Files> queryWrapper = new QueryWrapper<>(); queryWrapper.eq("md5", md5); List<Files> filesList = fileMapper.selectList(queryWrapper); return filesList.size() == 0 ? null : filesList.get(0); } @PostMapping("/update") public Result update(@RequestBody Files files) { return Result.success(fileMapper.updateById(files)); } @DeleteMapping("/{id}") public Result delete(@PathVariable Integer id) { Files files = fileMapper.selectById(id); files.setIsDelete(true); fileMapper.updateById(files); return Result.success(); } @PostMapping("/del/batch") public Result deleteBatch(@RequestBody List<Integer> ids) { // select * from sys_file where id in (id,id,id...) QueryWrapper<Files> queryWrapper = new QueryWrapper<>(); queryWrapper.in("id", ids); List<Files> files = fileMapper.selectList(queryWrapper); for (Files file : files) {//这里也是采用的假删除 file.setIsDelete(true); fileMapper.updateById(file); } return Result.success(); } /* * @Author lishipu * @Description 分页查询接口 * @Date 22:34 2023/1/20 * @Param * @return **/ @GetMapping("/page") public Result findPage(@RequestParam Integer pageNum, @RequestParam Integer pageSize, @RequestParam(defaultValue = "") String name) { QueryWrapper<Files> queryWrapper = new QueryWrapper<>(); // 查询未删除的记录,这里采用的假删除 queryWrapper.eq("is_delete", false); queryWrapper.orderByDesc("id"); if (!"".equals(name)) { queryWrapper.like("name", name); } return Result.success(fileMapper.selectPage(new Page<>(pageNum, pageSize), queryWrapper)); } }
这里主要说一下文件的上传和下载
文件的上传,这里可以也应该可以不用传到磁盘中去
@PostMapping("/upload") public String upload(@RequestParam MultipartFile file) throws IOException { String originalFilename = file.getOriginalFilename();//获得名字 String type = FileUtil.extName(originalFilename);//获得类型,像.png long size = file.getSize();//获得大小 //定义一个文件唯一的标识码 String uuid = IdUtil.fastSimpleUUID(); String fileUUID=uuid+StrUtil.DOT+type;//要加上.png或者.word File uploadFile = new File(fileUploadPath + fileUUID); //先存储到磁盘中去 File ParentFile =uploadFile.getParentFile(); //判断配置的文件目录是否存在,若不存在则创建一个新的文件目录 if(!ParentFile.exists()){ ParentFile.mkdirs(); } String url; //获取文件的Md5,通过对文件的md5,避免上传相同内容的文件 String md5 = SecureUtil.md5(file.getInputStream()); // 从数据库查询是否存在相同的记录 Files dbFiles = getFileByMd5(md5); if (dbFiles != null) { // 文件已存在 url = dbFiles.getUrl(); //由于文件已经存在,所以删除刚才上传的重复的文件 uploadFile.delete(); } else { // 上传文件到磁盘 file.transferTo(uploadFile); // 数据库若不存在重复文件,则不删除刚才上传的文件 url = "http://localhost:9090/file/" + fileUUID; } //储存到数据库中 Files saveFile = new Files();//定义实体类 saveFile.setName(originalFilename); saveFile.setType(type); saveFile.setSize(size/1024); saveFile.setUrl(url); saveFile.setMd5(md5); fileMapper.insert(saveFile);//插入 return url; }
文件的下载:这里文件前端文件的接口是http://localhost:9090/file/{fileUUID}
/* * @Author lishipu * 文件下载接口 http://localhost:9090/file/{fileUUID} * @Description 文件的下载 * @Date 21:16 2023/1/20 * @Param * @return **/ //fileUUID是uuid加点加类型 @GetMapping("/{fileUUID}") public void download(@PathVariable String fileUUID,HttpServletResponse response) throws IOException { // 根据文件的唯一标识码获取文件 File uploadFile = new File(fileUploadPath + fileUUID); // 设置输出流的格式 ServletOutputStream os = response.getOutputStream(); response.addHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileUUID, "UTF-8")); response.setContentType("application/octet-stream"); // 读取文件的字节流 os.write(FileUtil.readBytes(uploadFile)); os.flush(); os.close(); }
4.整合前端:
File.vue
<template> <div> <div style="margin: 10px 0"> <el-input style="width: 200px" placeholder="请输入名称" suffix-icon="el-icon-search" v-model="name"></el-input> <el-button class="ml-5" type="primary" @click="load">搜索</el-button> <el-button type="warning" @click="reset">重置</el-button> </div> <div style="margin: 10px 0"> <el-upload action="http://localhost:9090/file/upload" :show-file-list="false" :on-success="handleFileUploadSuccess" style="display: inline-block"> <el-button type="primary" class="ml-5">上传文件 <i class="el-icon-top"></i></el-button> </el-upload> <el-popconfirm class="ml-5" confirm-button-text='确定' cancel-button-text='我再想想' icon="el-icon-info" icon-color="red" title="您确定批量删除这些数据吗?" @confirm="delBatch" > <el-button type="danger" slot="reference">批量删除 <i class="el-icon-remove-outline"></i></el-button> </el-popconfirm> </div> <el-table :data="tableData" border stripe :header-cell-class-name="'headerBg'" @selection-change="handleSelectionChange"> <el-table-column type="selection" width="55"></el-table-column> <el-table-column prop="id" label="ID" width="80"></el-table-column> <el-table-column prop="name" label="文件名称"></el-table-column> <el-table-column prop="type" label="文件类型"></el-table-column> <el-table-column prop="size" label="文件大小(kb)"></el-table-column> <el-table-column label="下载"> <template slot-scope="scope"> <el-button type="primary" @click="download(scope.row.url)">下载</el-button> </template> </el-table-column> <el-table-column label="启用"> <template slot-scope="scope"> <el-switch v-model="scope.row.enable" active-color="#13ce66" inactive-color="#ccc" @change="changeEnable(scope.row)"></el-switch> </template> </el-table-column> <el-table-column label="操作" width="200" align="center"> <template slot-scope="scope"> <el-popconfirm class="ml-5" confirm-button-text='确定' cancel-button-text='我再想想' icon="el-icon-info" icon-color="red" title="您确定删除吗?" @confirm="del(scope.row.id)" > <el-button type="danger" slot="reference">删除 <i class="el-icon-remove-outline"></i></el-button> </el-popconfirm> </template> </el-table-column> </el-table> <div style="padding: 10px 0"> <el-pagination @size-change="handleSizeChange" @current-change="handleCurrentChange" :current-page="pageNum" :page-sizes="[2, 5, 10, 20]" :page-size="pageSize" layout="total, sizes, prev, pager, next, jumper" :total="total"> </el-pagination> </div> </div> </template> <script> export default { name: "File", data() { return { tableData: [], name: '', multipleSelection: [], pageNum: 1, pageSize: 10, total: 0 } }, created() { this.load() }, methods: { load() { this.request.get("/file/page", { params: { pageNum: this.pageNum, pageSize: this.pageSize, name: this.name, } }).then(res => { this.tableData = res.data.records this.total = res.data.total }) }, changeEnable(row) { this.request.post("/file/update", row).then(res => { if (res.code === '200') { this.$message.success("操作成功") } }) }, del(id) { this.request.delete("/file/" + id).then(res => { if (res.code === '200') { this.$message.success("删除成功") this.load() } else { this.$message.error("删除失败") } }) }, handleSelectionChange(val) {//多选 console.log(val) this.multipleSelection = val }, delBatch() { let ids = this.multipleSelection.map(v => v.id) // [{}, {}, {}] => [1,2,3] this.request.post("/file/del/batch", ids).then(res => { if (res.code === '200') { this.$message.success("批量删除成功") this.load() } else { this.$message.error("批量删除失败") } }) }, reset() { this.name = "" this.load() }, handleSizeChange(pageSize) { console.log(pageSize) this.pageSize = pageSize this.load() }, handleCurrentChange(pageNum) { console.log(pageNum) this.pageNum = pageNum this.load() }, handleFileUploadSuccess(res) { console.log(res) this.load() }, download(url) { window.open(url) } } } </script> <style scoped> </style>File.vue
添加路由
然后最后的样子就是这样的
看下载这个地方:
看看这个多选,删除的地方:
看看后端:
下面是更新头像
标签:文件,vue,springboot,String,file,import,fileUUID,上传,md5 From: https://www.cnblogs.com/lipu123/p/17065257.html