SpringBoot ElementUI 文件上传

---

前端部分

1.ElementUI页面样式如下，主要提交的form表单，样式部分省略，看ElementUI 官网

<el-form :model="form">
    <el-form-item label="省份证" :label-width="formLabelWidth">
        <el-input v-model="form.idcard"
                  auto-complete="off"></el-input>
    </el-form-item>
    <el-form-item label="姓名" :label-width="formLabelWidth">
        <el-input v-model="form.name" auto-complete="off"></el-input>
    </el-form-item>
    <el-form-item label="地址" :label-width="formLabelWidth">
        <el-input v-model="form.address"
                  auto-complete="off"></el-input>
    </el-form-item>
    <el-form-item label="原因" :label-width="formLabelWidth">
        <el-input v-model="form.reason"
                  auto-complete="off"></el-input>
    </el-form-item>
    <el-form-item label="描述" :label-width="formLabelWidth">
        <el-input v-model="form.describe"
                  auto-complete="off"></el-input>
    </el-form-item>
    <el-form-item label="真实图片">
        <el-upload class="avatar-uploader"
                   //后端图片上传接口
                   action="http://localhost:8001/file/upload"
                   :show-file-list="true"
                   :on-success="handleAvatarSuccess"
                   :before-upload="beforeAvatarUpload"
                   >
            <img v-if="imageUrl" :src="imageUrl" class="avatar" />
            <i v-else class="el-icon-plus avatar-uploader-icon"></i>
        </el-upload>
    </el-form-item>
</el-form>
<div slot="footer" class="dialog-footer">
     <el-button @click="dialogFormVisible = false">取 消</el-button>
     <el-button type="primary" @click="addbukongpeople">确 定</el-button>
</div>

2.Script如下：

<script>
export default {
  data() {
    return {
      //form表单内容
      form: {
        idcard: "",
        name: "",
        describe: "",
        address: "",
        reason: "",
        image: ""
      },
      formLabelWidth: "80px",

      imageUrl: ""
    };
  },
  methods: {
    //头像上传
    handleAvatarSuccess(res, file) {
      this.imageUrl = URL.createObjectURL(file.raw);
    },
    beforeAvatarUpload(file) {
      const isLt2M = file.size / 1024 / 1024 < 2;
      //此处得到上传的文件的名字
      this.form.image = file.name;
      if (!isLt2M) {
        this.$message.error("上传头像图片大小不能超过 2MB!");
      }
      return isLt2M;
    },
	//表单提交方法
    addbukongpeople() {
      var params = {
        idcard: this.form.idcard,
        name: this.form.name,
        address: this.form.address,
        //上传图片的名字
        image: this.form.image,
        reason: this.form.reason,
        describe: this.form.describe,
        id: this.form.id
      };
      addBuKong("/task/operatebukong", params).then(res => {
        if (res.code === 200) {
          location.reload();
          this.$message(res.data);
        } else if (res.code === 500) {
          this.$message(res.data);
        }
      });
    },
  },
};
</script>

---

后端部分

1.SpringBoot接收图片接口FielController：该部分用kotlin代码完成，RetObj为对return 的封装

@RestController
@RequestMapping("/file")
class FileController {
    @Resource
    var fileService:FileService?=null
    /**
     * 上传图片
     * */
    @RequestMapping("/upload",method = [RequestMethod.POST])
    fun uploadImage(file:MultipartFile,req:HttpServletRequest):RetObj{
        return fileService!!.uploadImage(file,req)
    }
}

2.FieleService接口

interface FileService {
    fun uploadImage(file: MultipartFile,req: HttpServletRequest): RetObj
}

3.FileServiceImpl实现类

@Service
class FileServiceImpl: BaseService(),FileService {
    override fun uploadImage(file: MultipartFile,req: HttpServletRequest): RetObj {
        try{
            val originalFilename = file.originalFilename
            val realPath =System.getProperty("user.dir")+"\\"+"images\\"
            FileUtils.upload(file.bytes,realPath,originalFilename)
            return RetObj(true,"上传成功！")
        }catch (e:Exception){
            return RetObj(false,e.message)
        }
    }
}

4.FilUtils类实现文件复制

public class FileUtils {
    /**
     * 上传工具类
     * */
    public static void upload(byte[] file,String filePath,String fileName) throws IOException {
        File targetFile=new File(filePath);
        if(!targetFile.exists()){
            targetFile.mkdirs();
        }
        FileOutputStream fileOutputStream=new FileOutputStream(filePath+fileName);
        fileOutputStream.write(file);
        fileOutputStream.flush();
        fileOutputStream.close();
    }
}

SpringBoot静态资源访问配置

/**
 * 配置图片访问路径
 * */
@Configuration
public class MyFileConfiguration implements WebMvcConfigurer {
    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
	//上传的图片在J:/Documents/Desktop/实习/项目例 子/biyesheji/bigdatacar/images"下，访问路径如：		http://localhost:8001/images/test1.jpg
    //其中images表示访问的前缀。"J:/Documents/Desktop/实习/项目例   子/biyesheji/bigdatacar/images"是文件真实的存储路径
       registry.addResourceHandler("/images/**").addResourceLocations("file:J:/Documents/Desktop/实习/项目例子/biyesheji/bigdatacar/images/");
    }
}

访问地址得到静态资源如下：localhost:8001/images/test1.jpg