图像上传功能实现-编程知识

图像上传功能实现

一、后端

文件存放在images.path路径下

package com.like.common;import jakarta.servlet.ServletOutputStream;
import jakarta.servlet.http.HttpServletResponse;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.UUID;/*** 本地文件上传下载*/
@RestController
@RequestMapping("/common")
@CrossOrigin
public class CommonController {@Value("${images.path}")private String basePath;/*** 文件上传* @param file* @return*/@PostMapping("/upload")public CommonDto<String> upload(MultipartFile file){//原始文件名String originalFilename = file.getOriginalFilename();String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));//使用UUID重新生成一个文件名，防止文件名重复，造成文件覆盖String fileName = UUID.randomUUID().toString() + suffix;//创建一个目录File dir = new File(basePath);//判断当前目录是否存在if(!dir.exists()){//如果目录不存在就直接创建dir.mkdirs();}try {//将临时文件转存到指定位置file.transferTo(new File(basePath + fileName));} catch (IOException e) {e.printStackTrace();}CommonDto<String> commonDto = new CommonDto<>();commonDto.setContent(fileName);return commonDto;}/*** 文件下载接口*/@GetMapping("/download")public void download(String name, HttpServletResponse response){try {//输入流，通过输入流读取文件内容FileInputStream fileInputStream = new FileInputStream(new File(basePath + name));//输出流 通过输出流将文件返回给浏览器，在浏览器中展示图片ServletOutputStream outputStream = response.getOutputStream();response.setContentType("/image/jpeg");int len = 0;byte[] bytes = new byte[1024];while((len = fileInputStream.read(bytes))!=-1){outputStream.write(bytes,0,len);outputStream.flush();}//关闭资源outputStream.close();fileInputStream.close();} catch (Exception e) {e.printStackTrace();}}
}

二、前端

表格元素里面添加如下代码

   <el-table-column label="头像"><template slot-scope="scope"><el-popoverplacement="top-start"trigger="hover"><img :src="scope.row.avatar" style="width: 150px; height: 150px;"><img :src="scope.row.avatar" slot="reference" style="width: 50px; height: 50px;"></el-popover></template></el-table-column>

新增和修改表单里添加如下代码

<!--        头像--><el-form-item label="头像" :label-width="formLabelWidth" prop="avatar"><el-uploadclass="avatar-uploader"action="http://localhost:3333/common/upload?module=avatar":show-file-list="false":on-success="handleAvatarSuccess"><img v-if="form.avatar" :src="form.avatar" class="avatar"><i v-else class="el-icon-plus avatar-uploader-icon"></i></el-upload></el-form-item>

methods里写handleAvatarSuccess逻辑

 handleAvatarSuccess(res, file) {this.form.avatar = `http://localhost:3333/common/download?name=${res.content}`//手动触发一头像字段的校验this.$refs.foreName.validateField('avatar');//强制刷新this.$forceUpdate();},