①后端springboot创建controller
FileController:
package com.example.springboot.controller;
import cn.hutool.core.io.FileUtil;
import com.example.springboot.common.AuthAccess;
import com.example.springboot.common.Result;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.IOException;
import java.net.URLEncoder;
@RestController
@RequestMapping("/file")
public class FileController {
@Value("${ip:localhost}")
String ip;
@Value("${server.port}")
String port;
private static final String ROOT_PATH=System.getProperty("user.dir")+File.separator+"files";
@PostMapping("/upload")
public Result upload(MultipartFile file) throws IOException{
String originFilename= file.getOriginalFilename();
String mainName= FileUtil.mainName(originFilename);
String extName=FileUtil.extName(originFilename);
if(!FileUtil.exist(ROOT_PATH)){
FileUtil.mkdir(ROOT_PATH);
}
if(FileUtil.exist(ROOT_PATH+File.separator+originFilename)){
originFilename=System.currentTimeMillis()+"_"+mainName+"."+extName;
}
File saveFile=new File(ROOT_PATH+File.separator+originFilename);
file.transferTo(saveFile);
String url="http://"+ip+":"+port+"/file/download/"+originFilename;
return Result.success(url);
}
@AuthAccess
@GetMapping("/download/{filename}")
public void download(@PathVariable String filename,HttpServletResponse response) throws IOException {
// response.addHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(filename, "UTF-8")); // 附件下载
response.addHeader("Content-Disposition", "inline;filename=" + URLEncoder.encode(filename, "UTF-8")); // 预览
String filePath=ROOT_PATH+File.separator+filename;
if(!FileUtil.exist(filePath)){
return;
}
byte[] bytes=FileUtil.readBytes(filePath);
ServletOutputStream outputStream=response.getOutputStream();
outputStream.write(bytes);
outputStream.flush();
outputStream.close();
}
}
②修改yml文件：配置url和port等全局变量
application.yml:
server:
port: 9090
spring:
datasource:
driver-class-name: com.mysql.cj.jdbc.Driver
url: jdbc:mysql://${ip}:3306/honey2024?useSSL=false&useUnicode=true&characterEncoding=UTF-8&serverTimezone=GMT%2b8
username: root
password: 123456
servlet:
multipart:
max-file-size: 20MB
max-request-size: 20MB
ip: localhost③配置全局异常文件
GlobalExeception：
package com.example.springboot.exception;
import com.example.springboot.common.Result;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.ResponseBody;
@ControllerAdvice
public class GlobalExeception {
@ExceptionHandler(ServiceException.class)
@ResponseBody
public Result serviceException(ServiceException e){
return Result.error(e.getCode(),e.getMessage());
}
@ExceptionHandler(Exception.class)
@ResponseBody
public Result globalException(Exception e){
e.printStackTrace();
return Result.error("500","系统错误");
}
}
运行效果：
访问一下这个url，发现可以预览：说明上传功能和预览，下载功能就完成了
至此后端的工作已经完成
④前端修改编写页面
HomeView.vue:
<template>
<div>
<el-container>
<!-- 侧边栏 -->
<el-aside :width="asideWidth" style="min-height: 100vh; background-color: #001529">
<div style="height: 60px; color: white; display: flex; align-items: center; justify-content: center">
<img src="@/assets/logo1.png" alt="" style="width: 40px; height: 40px">
<span class="logo-title" v-show="!isCollapse">honey2024</span>
</div>
<el-menu :collapse="isCollapse" :collapse-transition="false" router background-color="#001529" text-color="rgba(255, 255, 255, 0.65)" active-text-color="#fff" style="border: none" :default-active="$route.path">
<el-menu-item index="/">
<i class="el-icon-menu"></i>
<span slot="title">系统首页</span>
</el-menu-item>
<el-menu-item index="/1">
<i class="el-icon-house"></i>
<span slot="title">系统首页</span>
</el-menu-item>
<el-menu-item index="/2">
<i class="el-icon-house"></i>
<span slot="title">系统首页</span>
</el-menu-item>
<el-submenu index="3">
<template slot="title">
<i class="el-icon-menu"></i>
<span>信息管理</span>
</template>
<el-menu-item>用户信息</el-menu-item>
<el-menu-item>管理员信息</el-menu-item>
<el-menu-item index="/">系统首页</el-menu-item>
</el-submenu>
</el-menu>
</el-aside>
<el-container>
<!-- 头部区域-->
<el-header>
<i :class="collapseIcon" style="font-size: 26px" @click="handleCollapse"></i>
<el-breadcrumb separator-class="el-icon-arrow-right" style="margin-left: 20px">
<el-breadcrumb-item :to="{ path: '/' }">首页</el-breadcrumb-item>
<el-breadcrumb-item :to="{ path: '/user' }">用户管理</el-breadcrumb-item>
</el-breadcrumb>
<div style="flex: 1; width: 0; display: flex; align-items: center; justify-content: flex-end">
<i class="el-icon-quanping" style="font-size: 26px" @click="handleFull"></i>
<el-dropdown placement="bottom">
<div style="display: flex; align-items: center; cursor: default">
<img src="@/assets/logo1.png" alt="" style="width: 40px; height: 40px; margin: 0 5px">
<span>管理员</span>
</div>
<el-dropdown-menu slot="dropdown">
<el-dropdown-item>个人信息</el-dropdown-item>
<el-dropdown-item>修改密码</el-dropdown-item>
<el-dropdown-item @click.native="logout">退出登录</el-dropdown-item>
</el-dropdown-menu>
</el-dropdown>
</div>
</el-header>
<!-- 主体区域-->
<el-main>
<div style="box-shadow: 0 0 10px rgba(0,0,0,.1); padding: 10px 20px; border-radius: 5px; margin-bottom: 10px">
早安，骚年，祝你开心每一天！
</div>
<div style="display: flex;">
<el-card style="width: 30%;margin-right: 10px;">
<div slot="header" class="clearfix">
<span>青哥哥带你做毕设2024</span>
</div>
<div>
2024毕设正式开始了！青哥哥带你手把手敲出来！
<div style="margin-top: 20px">
<div style="margin: 10px 0"><strong>主题色</strong></div>
<el-button type="primary">按钮</el-button>
<el-button type="success">按钮</el-button>
<el-button type="warning">按钮</el-button>
<el-button type="danger">按钮</el-button>
<el-button type="info">按钮</el-button>
</div>
</div>
</el-card>
<el-card style="width: 70%;">
<div slot="header" class="clearfix">
<span>渲染用户的数据</span>
</div>
<div>
<el-table :data="users">
<el-table-column label="ID" prop="id"/>
<el-table-column label="用户名" prop="username"/>
<el-table-column label="姓名" prop="name"/>
<el-table-column label="地址" prop="address"/>
<el-table-column label="文件上传">
<template v-slot="scope">
<el-upload
action="http://localhost:9090/file/upload"
:show-file-list="false"
:headers="{token: user.token}"
:on-success="(row,file,fileList)=>handleTableFileUpload(scope.row,file,fileList)"
>
<el-button size="mini" type="primary">点击上传</el-button>
</el-upload>
</template>
</el-table-column>
<el-table-column label="文件下载">
<template v-slot="scope">
<el-image v-if="scope.row.avatar" :src="scope.row.avatar" style="width: 50px;height: 50px"></el-image>
<div>
<el-button @click="preview(scope.row.avatar)">
预览
</el-button>
</div>
</template>
</el-table-column>
</el-table>
</div>
</el-card>
</div>
<div style="display: flex;margin: 10px 0">
<el-card style="width: 50%;margin-right: 10px;">
<div slot="header" class="clearfix">
<span>文件上传下载</span>
</div>
<div>
<el-upload
action="http://localhost:9090/file/upload"
list-type="picture"
:headers="{token: user.token}"
:on-success="handleFileUpload"
>
<el-button size="small" type="primary">单文件上传</el-button>
</el-upload>
</div>
<div style="margin: 10px 0">
<el-upload
action="http://localhost:9090/file/upload"
:headers="{token: user.token}"
:on-success="handleMutipleFileUpload"
multiple
>
<el-button size="small" type="success">多文件上传</el-button>
</el-upload>
<el-button @click="showUrls" style="margin: 10px 0" type="primary">显示链接</el-button>
</div>
</el-card>
</div>
</el-main>
</el-container>
</el-container>
</div>
</template>
<script>
import axios from "axios";
import request from '@/utils/request'
export default {
name: 'HomeView',
data() {
return {
isCollapse: false, // 不收缩
asideWidth: '200px',
collapseIcon: 'el-icon-s-fold',
users: [],
user:JSON.parse(localStorage.getItem('honey-user')||'{}'),
url:'',
urls:[]
}
},
mounted() {
// axios.get('http://localhost:9090/user/selectall').then(res=>{
// console.log(res.data);
// this.users=res.data.data
// })
request.get('/user/selectall').then(res => {
this.users = res.data
})
},
methods: {
preview(url){
window.open(url)
},
showUrls(){
console.log(this.urls)
},
handleMutipleFileUpload(response,file,fileList){
this.urls=fileList.map(v=>v.response?.data)
},
handleTableFileUpload(row,file,fileList){
console.log(row,file,fileList)
row.avatar=file.response.data
// this.$set(row,'avatar',file.response.data)
console.log(row)
request.put('/user/update',row).then(res=>{
if(res.code==='200'){
this.$message.success('上传成功')
}else{
this.$message.error(res.msg)
}
})
},
handleFileUpload(response,file,fileList){
this.fileList=fileList
console.log(response,file,fileList)
},
logout() {
localStorage.removeItem("honey-user")
this.$router.push('/login')
},
handleFull() {
document.documentElement.requestFullscreen()
},
handleCollapse() {
this.isCollapse = !this.isCollapse
this.asideWidth = this.isCollapse ? '64px' : '200px'
this.collapseIcon = this.isCollapse ? 'el-icon-s-unfold' : 'el-icon-s-fold'
}
}
}
</script>
<style>
.el-menu--inline {
background-color: #000c17 !important;
}
.el-menu--inline .el-menu-item {
background-color: #000c17 !important;
padding-left: 49px !important;
}
.el-menu-item:hover, .el-submenu__title:hover {
color: #fff !important;
}
.el-submenu__title:hover i {
color: #fff !important;
}
.el-menu-item:hover i {
color: #fff !important;
}
.el-menu-item.is-active {
background-color: #1890ff !important;
border-radius: 5px !important;
width: calc(100% - 8px);
margin-left: 4px;
}
.el-menu-item.is-active i, .el-menu-item.is-active .el-tooltip {
margin-left: -4px;
}
.el-menu-item {
height: 40px !important;
line-height: 40px !important;
}
.el-submenu__title {
height: 40px !important;
line-height: 40px !important;
}
.el-submenu .el-menu-item {
min-width: 0 !important;
}
.el-menu--inline .el-menu-item.is-active {
padding-left: 45px !important;
}
/*.el-submenu__icon-arrow {*/
/* margin-top: -5px;*/
/*}*/
.el-aside {
transition: width .3s;
box-shadow: 2px 0 6px rgba(0, 21, 41, .35);
}
.logo-title {
margin-left: 5px;
font-size: 20px;
transition: all .3s; /* 0.3s */
}
.el-header {
box-shadow: 2px 0 6px rgba(0, 21, 41, .35);
display: flex;
align-items: center;
}
</style>最后效果：实现了单文件或者多文件上传和预览下载的功能
