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Springboot与vue实现文件导入方法具体介绍

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一、Java后端使用MultipartFile

@PostMapping(value = "/upload")
    public String upload(@RequestParam("file") MultipartFile multipartFile) {
        return FileUploadUtil.upload(multipartFile);
    }

如果使用Springboot架构,直接使用MultipartFile工具即可,后端拿到MultipartFile对象之后,对其进一步处理就能拿到数据,或者存入数据库,或者保存到本地都可以。

二、Java后端直接从request中读取并转换为字符串

	Part importFile = request.getPart("file");
	InputStream inputstream = importFile.getInputStream();
	BufferedReader streamReader = new BufferedReader(new InputStreamReader(inputstream, "UTF-8"));
	StringBuilder stringBuilder = new StringBuilder();
	String inputStr;
	while ((inputStr = streamReader.readLine()) != null) {
	    stringBuilder.append(inputStr);
	}
	String s = stringBuilder.toString();

直接从request中读取需要使用Part类,从request中根据名称获取到part对象,然后再转换为流的形式,之后使用BufferedReader流读取器,逐行读取文件内容并添加到字符串构造器中,生成字符串。

三、Java后端直接从request中读取并存入本地文件

HttpServletRequest request = context.getRequest();
FileOutputStream fos = new FileOutputStream("C:\\Users\\Junhao\\Desktop\\import.json");
byte[] buffer = new byte[1024];
int len;
Part file = request.getPart("file");
InputStream inputstream = file.getInputStream();
while ((len = inputstream.read(buffer)) != -1){
    fos.write(buffer, 0, len);
}
fos.close();
inputstream.close();
String responseString = readInputStream(inputstream);
System.out.println(responseString);
BufferedReader streamReader = new BufferedReader(new InputStreamReader(inputstream, "UTF-8"));
StringBuilder stringBuilder = new StringBuilder();
String inputStr;
while ((inputStr = streamReader.readLine()) != null) {
    stringBuilder.append(inputStr);
}
String s = stringBuilder.toString();
Object parse = JSON.parse(s);

四、前端使用el-upload

由于要求在上传之前进行检验,然后根据检验的结果,对于冲突的实体,逐项选择覆盖已有实体,或者使用原来实体,这相对于单纯的文件上传,提高了难度

1.el-upload使用

   <el-dialog :title="upload.title" :visible.sync="upload.open" width="400px" append-to-body>
      <el-upload
        ref="upload"
        :limit="1"
        accept=".json"
        :headers="upload.headers"
        :action="upload.url"
        :disabled="upload.isUploading"
        :on-progress="handleFileUploadProgress"
        :on-success="handleFileSuccess"
        :on-change="handleChange"
        :before-remove="handleRemove"
        :auto-upload="false"
        drag
        :data="upload.uploadData"
      >
        <i class="el-icon-upload"></i>
        <div class="el-upload__text">
          将文件拖到此处,或
          <em>点击上传</em>
        </div>
        <div class="el-upload__tip" style="color:red" slot="tip">提示:仅允许导入“json”格式文件!</div>
      </el-upload>
        <div v-if="showImportCheckRes" style="margin-top: 8px">
          <el-tabs active-name="thing">
              <el-tab-pane name="thing" label="事物" style="height: 130px;" class="scrollbar">
                <el-scrollbar style="height: 100%">
                  <el-form label-position="left">
                    <div v-for="item in importCheckRes.existThings">
                      <el-form-item :label="item.code" label-width="160px">
                        <el-radio-group v-model="item.value">
                          <el-radio :label="0">暂不导入</el-radio>
                          <el-radio :label="1">覆盖</el-radio>
                        </el-radio-group>
                      </el-form-item>
                    </div>
                  </el-form>
                </el-scrollbar>
              </el-tab-pane>
              <el-tab-pane name="thingTemplate" label="事物模板" style="height: 130px;" class="scrollbar">
                <el-scrollbar style="height: 100%">
                  <el-form label-position="left">
                    <div v-for="item in importCheckRes.existThings">
                      <el-form-item :label="item.code" label-width="160px">
                        <el-radio-group v-model="item.value">
                          <el-radio :label="0">暂不导入</el-radio>
                          <el-radio :label="1">覆盖</el-radio>
                        </el-radio-group>
                      </el-form-item>
                    </div>
                  </el-form>
                </el-scrollbar>
              </el-tab-pane>
            <el-tab-pane name="dataModel" label="数据模型" style="height: 130px;" class="scrollbar">
              <el-scrollbar style="height: 100%">
                <el-form label-position="left">
                  <div v-for="item in importCheckRes.existDataModels">
                    <el-form-item :label="item.code" label-width="160px">
                      <el-radio-group v-model="item.value">
                        <el-radio :label="0">暂不导入</el-radio>
                        <el-radio :label="1">覆盖</el-radio>
                      </el-radio-group>
                    </el-form-item>
                  </div>
                </el-form>
              </el-scrollbar>
            </el-tab-pane>
            <el-tab-pane name="modelTag" label="模型标签" style="height: 130px;" class="scrollbar">
              <el-scrollbar style="height: 100%">
                <el-form label-position="left">
                  <div v-for="item in importCheckRes.existModelTags">
                    <el-form-item :label="item.code" label-width="160px">
                      <el-radio-group v-model="item.value">
                        <el-radio :label="0">暂不导入</el-radio>
                        <el-radio :label="1">覆盖</el-radio>
                      </el-radio-group>
                    </el-form-item>
                  </div>
                </el-form>
              </el-scrollbar>
            </el-tab-pane>
          </el-tabs>
        </div>
      <div slot="footer" class="dialog-footer">
        <el-button type="primary" @click="submitImport" size="mini">确 定</el-button>
        <el-button @click="upload.open = false" size="mini">取 消</el-button>
      </div>
    </el-dialog>

2.on-change验证文件内容

    handleChange(file){
      if (this.importStatus === 1){
        return;
      }
      let that = this
      let raw = file.raw
      const reader = new FileReader()
      reader.readAsText(raw, 'UTF-8')
      reader.onload=async function(evt){
        let dataJson = JSON.parse(evt.target.result)
        const Entities = dataJson.Entities
        const entityCode = {}
        Object.keys(Entities).forEach(item=>{
          const tempArray = []
          Object.values(Entities[item])[0].forEach(i=>{
            tempArray.push(i.code)
          })
          that.$set(entityCode, item, JSON.parse(JSON.stringify(tempArray)))
        })
        that.$nextTick(()=>{
          importCheck(entityCode).then(res=>{
            that.importCheckRes = res.data
            that.showImportCheckRes = true
          })
        })
      }
    },

在前端先解析文件,读取JSON数据,然后将要导入的code发送到后端,返回哪些是已有的,然后在前端进行覆盖或者暂不导入的选择,选择完成之后点击确定,携带选择的结果进行导入

    submitImport() {
      const tempJson = JSON.parse(JSON.stringify(this.importCheckRes))
      const importCheckRes = {}
      Object.keys(tempJson).forEach(item=>{
        const tempArray = []
        tempJson[item].forEach(i=>{
          if (i.value === 1){
            tempArray.push(i.code)
          }
        })
        this.$set(importCheckRes, item, tempArray);
      })
      this.$set(this.upload, 'uploadData', { importCheckRes: JSON.stringify(importCheckRes) })
      this.$nextTick(()=>{
        this.$refs.upload.submit()
      })
    },

3.效果截图

总结

这两天的项目中,学习了Java导出数据,其中遇到坑及总结如下:

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