kotlin使用spring mvc（五）

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简单参数验证

使用spring mvc，可以使用默认提供的注解进行参数验证，下面我们用一个简单的示例列进行说明实体类Passenger中的NotEmpty要加在field上，所以要使用@get:NotEmpty

import java.time.LocalDateTime
import javax.validation.constraints.NotEmpty

data class Passenger(val id: Int,
                      //较验参数非空字符串
                     @get:NotEmpty(message = "用户名不能为空")
                     val name: String,
                     var birthday: LocalDateTime
)

添加一个CommonResult来返回操作状态

data class CommonResult<T>(
        var data: T?,
        var succes: Boolean,
        var msg: String
){
    constructor():this(null,false,"")
}

Action上要使用@Valid启用验证，否则是不生效的，下面这段我们没有加，就会不生效

 @PostMapping("p/add")
    fun addPassenger(@RequestBody p:Passenger):CommonResult<Any>{
        return CommonResult(null,true,"添加成功")
    }

我们post一个json

{"id":1,"name":"","birthday":"2018-08-09T12:33:22.123"}

发现返回了添加成功，确实没有生效

{"data":null,"succes":true,"msg":"添加成功"}

下面我们加上@Valid

  @PostMapping("p/add")
    fun addPassenger(@Valid @RequestBody p:Passenger):CommonResult<Any>{
        return CommonResult(null,true,"添加成功")
    }

再次post，发现确实生效了，返回了验证失败

{
	"timestamp": "2018-10-25T06:44:31.196+0000",
	"status": 400,
	"error": "Bad Request",
	"errors": [{
		"codes": ["NotEmpty.passenger.name", "NotEmpty.name", "NotEmpty.java.lang.String", "NotEmpty"],
		"arguments": [{
			"codes": ["passenger.name", "name"],
			"arguments": null,
			"defaultMessage": "name",
			"code": "name"
		}],
		"defaultMessage": "用户名不能为空",
		"objectName": "passenger",
		"field": "name",
		"rejectedValue": "",
		"bindingFailure": false,
		"code": "NotEmpty"
	}],
	"message": "Validation failed for object='passenger'. Error count: 1",
	"path": "/p/add"
}

来源：oschina

链接：https://my.oschina.net/u/1865350/blog/2252381

标签

kotlin

Spring

validation