Spring Boot Failed to convert value of type ‘xxx‘ to required type ‘xxx‘问题解决-蒲公英云

Spring Boot Failed to convert value of type ‘xxx‘ to required type ‘xxx‘问题解决

问题描述：

org.springframework.web.method.annotation.MethodArgumentTypeMismatchException: Failed to convert value of type ‘java.lang.String’ to required type ‘java.lang.Long’;

问题分析：

1、使用Swagger调试地址栏传参的接口时，参数类型paramType设置为query，导致调用接口报错。

@DeleteMapping("delete/{id}")
    @ApiOperation(value = "删除")
    @ApiImplicitParams({
            @ApiImplicitParam(name = "id", value = "ID", paramType = "query", dataType = "Long", required = true)
    })
    public String delete(@PathVariable("id") Long id){
        return "";
    }

解决办法：将paramType设置为path，代表地址栏传参。

@DeleteMapping("delete/{id}")
    @ApiOperation(value = "删除")
    @ApiImplicitParams({
            @ApiImplicitParam(name = "id", value = "ID", paramType = "path", dataType = "Long", required = true)
    })
    public String delete(@PathVariable("id") Long id){
        return "";
    }

2、后端接口参数类型为Date，但是前端传参类型为String。

public String testDate(@RequestParam Date time) {
        return DateUtil.format(time,"yyyy-MM-dd");
    }

解决办法：

（1）后端接口参数类型改为String，前端传参不变。

public String testDate(@RequestParam String time) {
        return time;
    }

（2）后端接口参数类型添加@DateTimeFormat，将固定格式的字符串转成Date，前端传参不变。

public String testDate(@RequestParam @org.springframework.format.annotation.DateTimeFormat(pattern = "yyyy-MM-dd")  Date time) {
        return DateUtil.format(time,"yyyy-MM-dd");
    }