報錯：For input string: ""

報錯具體內容如下：

 原因分析：輸入空字符串，無法解析成長整形

錯誤代碼：

前端

openEditDialog(dialogStatus, titleStatus, row) {
      this.dialogTableVisible = dialogStatus;
      this.titleStatus = titleStatus;
      if (titleStatus === "create") {
        this.cleanData();
      }
      if (row) {
        this.entity = Object.assign({
          goodsCode: "",
          goodsName: "",
          goodsType: "",
          goodsSpec: "",
          packageType: "",
          goodsEngName: "",
          produceAddress: "",
          isvalid: "1",
          goodsDesc: "",
          remark: "",
          entityId: ""
        }, row);
        this.oldGoodsCode=this.entity.goodsCode;
      }
      this.$nextTick(() => {
        this.$refs["form"].clearValidate();
      })

    },

cleanData() {
  this.entity = {
    goodsCode: "",
    goodsName: "",
    goodsType: "",
    goodsSpec: "",
    packageType: "",
    goodsEngName: "",
    produceAddress: "",
    isvalid: "1",
    goodsDesc: "",
    remark: "",
    entityId: ""
  }
  this.enpriseName = "";
},

create() {
  this.$refs['form'].validate((valid) => {
    if (valid) {
      this.submitLoading = true;
      saveGoods(this.entity).then(res => {
        if(res.success){
          this.$message.success(res.msg);
          this.$emit("getList")
        }else {
          this.$message.error(res.msg);
        }
      }).catch(() => {
        this.$message.error("新增失敗")
      }).finally(() => {
        this.submitLoading = false;
        this.close();
      })
    }
  })
},

后台：

@PostMapping("/saveGoods")
    @Log("添加商品")
    public Result saveGoods(@RequestBody Goods goods) throws Exception {
        return goodsService.saveGoods(goods);

    }

Goods實體類中

/**
     * 所屬企業
     */
    @Column(name="entity_id")
    @JsonSerialize(using = LongJsonSerializer.class)
    @JsonDeserialize(using = LongJsonDeserializer.class)
    private Long entityId;

當點擊添加時，由於this.entity.entityId值為空字符串，后台用Long類型的entityId接收，故報錯

解決方案：前端傳遞entityId時將空字符串改為null。