Sql

数据库新建sys_file用来保存上传文件信息

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;

后台代码

实现文件上传功能

application.yml

设置文件上传路径【有中文会报错】

server:
  ip: localhost
  port: 9090

spring:
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://localhost:3306/joyce?serverTimezone=GMT%2b8
    username: root
    password: 123456
  redis:
    host: 127.0.0.1
    port: 6379
  servlet:
    multipart:
      max-file-size: 100MB
      max-request-size: 100MB
mybatis:
  mapper-locations: classpath:mapper/*.xml  #扫描所有mybatis的xml文件
#  configuration:
#    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl
mybatis-plus:
  configuration:
    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl
files:
  upload:
    path: E:/Springboot2-project/files/

Files.java

实体类Files创建

package com.zj.demo.entity;

import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableId;
import com.baomidou.mybatisplus.annotation.TableName;
import lombok.Data;

@Data
@TableName("sys_file")
public class Files {

    @TableId(type = IdType.AUTO)
    private Integer id;
    private String name;
    private String type;
    private Long size;
    private String url;
    private String md5;
    private Boolean isDelete;
    private Boolean enable;

}

FileMapper.java

创建Mapper用以Controller引用

package com.zj.demo.mapper;

import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.zj.demo.entity.Files;

public interface FileMapper extends BaseMapper<Files> {
}

FileController.java

上传，下载文件接口实现

package com.zj.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.zj.demo.common.Result;
import com.zj.demo.entity.Files;
import com.zj.demo.mapper.FileMapper;
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;

/**
 * 文件上传相关接口
 */
@RestController
@RequestMapping("/file")
public class FileController {

    //配置文件值赋值给变量
    @Value("${files.upload.path}")
    private String fileUploadPath;

    @Value("${server.ip}")
    private String serverIp;

    @Resource
    private FileMapper fileMapper;

    /**
     * 文件上传接口
     * @param file 前端传递过来的文件
     * @return
     * @throws IOException
     */
    @PostMapping("/upload")
    public String upload(@RequestParam MultipartFile file) throws IOException {
        String originalFilename = file.getOriginalFilename();
        String type = FileUtil.extName(originalFilename);
        long size = file.getSize();

        // 定义一个文件唯一的标识码
        String fileUUID = IdUtil.fastSimpleUUID() + StrUtil.DOT + type;

        File uploadFile = new File(fileUploadPath + fileUUID);
        // 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
        File parentFile = uploadFile.getParentFile();
        if(!parentFile.exists()) {
            parentFile.mkdirs();
        }

        String url;
        // 获取文件的md5
        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) {
            url = dbFiles.getUrl();
        } 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://" + serverIp + ":9090/file/" + fileUUID;
        }
        // 保存文件信息到数据库
        Files saveFile = new Files();
        saveFile.setName(originalFilename);
        saveFile.setType(type);
        saveFile.setSize(size/1024);
        saveFile.setUrl(url);
        saveFile.setMd5(md5);
        fileMapper.insert(saveFile);

        return url;

    }

    /**
     * 文件下载接口   http://localhost:9090/file/{fileUUID}
     * @param fileUUID
     * @param response
     * @throws IOException
     */
    @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();
    }

    /**
     * 通过文件的md5查询文件
     * @param md5
     * @return
     */
    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();
    }

    //批量删除
    @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) {
            file.setIsDelete(true);
            fileMapper.updateById(file);
        }
        return Result.success();
    }

    /**
     * 分页查询接口
     * @param pageNum
     * @param pageSize
     * @param name
     * @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
        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));
    }


}

拦截器InterceptorConfig.java

前端代码

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.$message.error("删除失败")
        }
      })
    },
    handleSelectionChange(val) {
      console.log(val)
      this.multipleSelection = val
    },
    delBatch() {
      let ids = this.multipleSelection.map(v => v.id)  // [{}, {}, {}] => [1,2,3]
      this.request.post("/file/del/batch", ids).then(res => {
        if (res.code === '200') {
          this.$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>

Aside.vue

  <el-menu-item index="/file">
        <i class="el-icon-document"></i>
        <span slot="title">文件管理</span>
      </el-menu-item>

router

加入File页面路由

  { path: 'file', name: '文件管理', component: () => import('../views/File.vue')},

Person.vue

加入头像上传功能

<template>
  <el-card style="width: 500px;">
    <el-form label-width="80px" size="small">
      <el-upload
          class="avatar-uploader"
          action="http://localhost:9090/file/upload"
          :show-file-list="false"
          :on-success="handleAvatarSuccess"
      >
        <img v-if="form.avatarUrl" :src="form.avatarUrl" class="avatar">
        <i v-else class="el-icon-plus avatar-uploader-icon"></i>
      </el-upload>

      <el-form-item label="用户名">
        <el-input v-model="form.username" autocomplete="off"></el-input>
      </el-form-item>
      <el-form-item label="昵称">
        <el-input v-model="form.nickname" autocomplete="off"></el-input>
      </el-form-item>
      <el-form-item label="邮箱">
        <el-input v-model="form.email" autocomplete="off"></el-input>
      </el-form-item>
      <el-form-item label="电话">
        <el-input v-model="form.phone" autocomplete="off"></el-input>
      </el-form-item>
      <el-form-item label="地址">
        <el-input v-model="form.address" autocomplete="off"></el-input>
      </el-form-item>
      <el-form-item>
        <el-button type="primary" @click="save">确 定</el-button>
      </el-form-item>
    </el-form>
  </el-card>
</template>

<script>
export default {
  name: "Person",
  data() {
    return {
      form: {},
      user: localStorage.getItem("user") ? JSON.parse(localStorage.getItem("user")) : {}
    }
  },
  created() {
    this.getUser().then(res => {
      console.log(res)
      this.form = res
    })
  },
  methods: {
    async getUser() {
      return (await this.request.get("/user/username/" + this.user.username)).data
    },
    save() {
      this.request.post("/user", this.form).then(res => {
        if (res.code === '200') {
          this.$message.success("保存成功")

          // 更新浏览器存储的用户信息
          this.getUser().then(res => {
            res.token = JSON.parse(localStorage.getItem("user")).token
            localStorage.setItem("user", JSON.stringify(res))
          })

        } else {
          this.$message.error("保存失败")
        }
      })
    },
    handleAvatarSuccess(res) {
      this.form.avatarUrl = res
    }
  }
}
</script>

<style>
.avatar-uploader {
  text-align: center;
  padding-bottom: 10px;
}
.avatar-uploader .el-upload {
  border: 1px dashed #d9d9d9;
  border-radius: 6px;
  cursor: pointer;
  position: relative;
  overflow: hidden;
}
.avatar-uploader .el-upload:hover {
  border-color: #409EFF;
}
.avatar-uploader-icon {
  font-size: 28px;
  color: #8c939d;
  width: 138px;
  height: 138px;
  line-height: 138px;
  text-align: center;
}
.avatar {
  width: 138px;
  height: 138px;
  display: block;
}
</style>

页面测试记录

postman测试

1，初步检测uploadfile,发现需要Token
在这里插入图片描述
在IntercepterConfig先放行file

再次测试【图片记得上传小点的，不要超过1MB】

上传成功【但是文件没有后缀】

有文件后缀

加入下载路径之后再次测试
在这里插入图片描述
点击链接可以下载

在这里插入图片描述
数据库内也有数据

测试MD5上传重复文件

前端页面

在这里插入图片描述
后台对应数据

在这里插入图片描述
上传头像

数据库里的用户avatar更新了

补充：头像上传完Header联动更新问题

点击Person的确定按钮时，首先触发父级更新方法【Manage-@refreshUser】获取最新后台用户信息，重新赋给user变量，然后传给Header组件

Person.vue

<template>
  <el-card style="width: 500px;">
    <el-form label-width="80px" size="small">
      <el-upload
          class="avatar-uploader"
          action="http://localhost:9090/file/upload"
          :show-file-list="false"
          :on-success="handleAvatarSuccess"
      >
        <img v-if="form.avatarUrl" :src="form.avatarUrl" class="avatar">
        <i v-else class="el-icon-plus avatar-uploader-icon"></i>
      </el-upload>

      <el-form-item label="用户名">
        <el-input v-model="form.username" disabled autocomplete="off"></el-input>
      </el-form-item>
      <el-form-item label="昵称">
        <el-input v-model="form.nickname" autocomplete="off"></el-input>
      </el-form-item>
      <el-form-item label="邮箱">
        <el-input v-model="form.email" autocomplete="off"></el-input>
      </el-form-item>
      <el-form-item label="电话">
        <el-input v-model="form.phone" autocomplete="off"></el-input>
      </el-form-item>
      <el-form-item label="地址">
        <el-input type ="textarea" v-model="form.address" autocomplete="off"></el-input>
      </el-form-item>
      <el-form-item>
        <el-button type="primary" @click="save">确 定</el-button>
      </el-form-item>
    </el-form>
  </el-card>
</template>

<script>
export default {
  name: "Person",
  data() {
    return {
      form: {},
      user: localStorage.getItem("user") ? JSON.parse(localStorage.getItem("user")) : {}
    }
  },
  created() {
    this.getUser().then(res => {
      console.log(res)
      this.form = res
    })
  },
  methods: {
    async getUser() {
      return (await this.request.get("/user/username/" + this.user.username)).data
    },
    save() {
      this.request.post("/user", this.form).then(res => {
        if (res.code === '200') {
          this.$message.success("保存成功")
          //触发父级更新User的方法
          this.$emit("refreshUser")

          // 更新浏览器储存localStorage中的User数据
          this.getUser().then(res => {
            res.token = JSON.parse(localStorage.getItem("user")).token
            localStorage.setItem("user", JSON.stringify(res))
          })

        } else {
          this.$message.error("保存失败")
        }
      })
    },
    handleAvatarSuccess(res) {
      this.form.avatarUrl = res
    }
  }
}
</script>

<style>
.avatar-uploader {
  text-align: center;
  padding-bottom: 10px;
}
.avatar-uploader .el-upload {
  border: 1px dashed #d9d9d9;
  border-radius: 6px;
  cursor: pointer;
  position: relative;
  overflow: hidden;
}
.avatar-uploader .el-upload:hover {
  border-color: #409EFF;
}
.avatar-uploader-icon {
  font-size: 28px;
  color: #8c939d;
  width: 138px;
  height: 138px;
  line-height: 138px;
  text-align: center;

}
.avatar {
  width: 138px;
  height: 138px;
  border-radius: 50%;;
  display: block;

}
</style>

Header.vue

<template>
  <div style="line-height: 60px; display: flex">
    <div style="flex: 1;">
      <span :class="collapseBtnClass" style="cursor: pointer; font-size: 18px" @click="collapse"></span>

      <el-breadcrumb separator="/" style="display: inline-block; margin-left: 10px">
        <el-breadcrumb-item :to="'/'">
首页</el-breadcrumb-item>
        <el-breadcrumb-item>{{ currentPathName }}</el-breadcrumb-item>
      </el-breadcrumb>
    </div>
    <el-dropdown style="width: 150px; cursor: pointer;text-align: right">
      <div style="display: inline-block">
        <img :src="user.avatarUrl" alt=""
             style="width: 30px; height: 30px; border-radius: 50%; position: relative; top:8px; right: 8px">
        <span>{{user.nickname}}</span><i class="el-icon-arrow-down" style="margin-left: 5px"></i>
      </div>
      <el-dropdown-menu slot="dropdown" style="width: 100px; text-align: center">
        <el-dropdown-item style="font-size: 14px; padding: 5px 0">
          <router-link to="/person">个人信息</router-link>
        </el-dropdown-item>
        <el-dropdown-item style="font-size: 14px; padding: 5px 0">
          <span style="text-decoration: none" @click="logout">退出</span>
        </el-dropdown-item>
      </el-dropdown-menu>
    </el-dropdown>
  </div>
</template>

<script>
export default {
  name: "Header",
  props: {
    collapseBtnClass: String,
    user: Object
  },
  computed: {
    currentPathName () {
      return this.$store.state.currentPathName;　　//需要监听的数据
    }
  },
  data() {
      return {
      }
  },
  methods: {
    collapse() {
      // this.$parent.$parent.$parent.$parent.collapse()  // 通过4个 $parent 找到父组件，从而调用其折叠方法
      this.$emit("asideCollapse")
    },
    logout() {
      this.$router.push("/login")
      localStorage.removeItem("user")
      this.$message.success("退出成功")
    }
  }
}
</script>

<style scoped>
</style>

Manage.vue

<template>
  <el-container style="min-height: 100vh">

    <el-aside :width="sideWidth + 'px'" style="box-shadow: 2px 0 6px rgb(0 21 41 / 35%);">
      <Aside :isCollapse="isCollapse" :logoTextShow="logoTextShow" style="padding-bottom: 20px" />
    </el-aside>

    <el-container>
      <el-header style="border-bottom: 1px solid #ccc;">
        <Header :collapseBtnClass="collapseBtnClass" @asideCollapse="collapse" :user="user" />
      </el-header>

      <el-main>
        <!--        表示当前页面的子路由会在 <router-view /> 里面展示-->
        <router-view @refreshUser="getUser" />
      </el-main>

    </el-container>
  </el-container>
</template>

<script>

import Aside from "@/components/Aside";
import Header from "@/components/Header";

export default {
  name: 'Home',
  data() {
    return {
      collapseBtnClass: 'el-icon-s-fold',
      isCollapse: false,
      sideWidth: 200,
      logoTextShow: true,
      user: {}
    }
  },
  components: {
    Aside,
    Header
  },
  created() {
    // 从后台获取最新的User数据
    this.getUser()
  },
  methods: {
    collapse() {  // 点击收缩按钮触发
      this.isCollapse = !this.isCollapse
      if (this.isCollapse) {  // 收缩
        this.sideWidth = 64
        this.collapseBtnClass = 'el-icon-s-unfold'
        this.logoTextShow = false
      } else {   // 展开
        this.sideWidth = 200
        this.collapseBtnClass = 'el-icon-s-fold'
        this.logoTextShow = true
      }
    },
    getUser() {
      let username = localStorage.getItem("user") ? JSON.parse(localStorage.getItem("user")).username : ""
      if (username) {
        // 从后台获取User数据
        this.request.get("/user/username/" + username).then(res => {
          // 重新赋值后台的最新User数据
          this.user = res.data
        })
      }
    }
  }
}
</script>