概述

??Spring MVC支持Bean Validation，通過這個(gè)驗(yàn)證技術(shù)，可以通過注解方式，很方便的對(duì)輸入?yún)?shù)進(jìn)行驗(yàn)證，之前使用的校驗(yàn)方式，都是基于Bean對(duì)象的，但是在@RequestParam中，沒有Bean對(duì)象，這樣使得校驗(yàn)無法進(jìn)行，可以通過使用@Validated注解，使得校驗(yàn)可以進(jìn)行。

校驗(yàn)bean對(duì)象

??一般校驗(yàn)bean對(duì)象，為了可以自動(dòng)的校驗(yàn)屬性，可以通過兩步解決：

一、聲明對(duì)象

package com.github.yongzhizhan.draftbox.model;import javax.validation.constraints.Size;/*** 帶驗(yàn)證的對(duì)象* @author zhanyongzhi*/public class Foo {private String validString;@Size(min = 1, max = 5)public String getValidString() {return validString;}public void setValidString(final String vValidString) {validString = vValidString;} }

二、通過@Valid注解使用對(duì)象

@ResponseBody@RequestMapping(value = "validObject", method = RequestMethod.POST) @ResponseStatus(HttpStatus.OK) public String validObject(@RequestBody()@Valid Foo vFoo, BindingResult vBindingResult){return vFoo.getValidString(); }

校驗(yàn)RequestParams

??使用校驗(yàn)bean的方式，沒有辦法校驗(yàn)RequestParam的內(nèi)容，一般在處理Get請(qǐng)求的時(shí)候，會(huì)使用下面這樣的代碼：

@ResponseBody@RequestMapping(value = "validString", method = RequestMethod.GET) @ResponseStatus(HttpStatus.OK) public String validString(@RequestParam(value = "str", defaultValue = "")String vStr){return vStr; }

??使用@Valid注解，對(duì)RequestParam對(duì)應(yīng)的參數(shù)進(jìn)行注解，是無效的，需要使用@Validated注解來使得驗(yàn)證生效。操作步驟如下：

一、聲明錯(cuò)誤處理類

package com.github.yongzhizhan.draftbox.controller;import org.springframework.context.annotation.Bean; import org.springframework.http.HttpStatus; import org.springframework.stereotype.Component; import org.springframework.validation.beanvalidation.MethodValidationPostProcessor; import org.springframework.web.bind.annotation.ControllerAdvice; import org.springframework.web.bind.annotation.ExceptionHandler; import org.springframework.web.bind.annotation.ResponseBody; import org.springframework.web.bind.annotation.ResponseStatus;import javax.validation.ValidationException;@ControllerAdvice @Component public class GlobalExceptionHandler {@Beanpublic MethodValidationPostProcessor methodValidationPostProcessor() {return new MethodValidationPostProcessor();}@ExceptionHandler@ResponseBody@ResponseStatus(HttpStatus.BAD_REQUEST)public String handle(ValidationException exception) {System.out.println("bad request, " + exception.getMessage());return "bad request, " + exception.getMessage();} }

二、聲明@Validated并加上校驗(yàn)注解

package com.github.yongzhizhan.draftbox.controller;import com.github.yongzhizhan.draftbox.model.Foo; import org.springframework.beans.factory.annotation.Value; import org.springframework.http.HttpStatus; import org.springframework.validation.BindingResult; import org.springframework.validation.annotation.Validated; import org.springframework.web.bind.annotation.RequestBody; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.bind.annotation.RequestParam; import org.springframework.web.bind.annotation.ResponseBody; import org.springframework.web.bind.annotation.ResponseStatus; import org.springframework.web.bind.annotation.RestController;import javax.validation.Valid; import javax.validation.constraints.Size;@RestController @SuppressWarnings("UnusedDeclaration") @Validated public class IndexController {@ResponseBody@RequestMapping(value = "validString", method = RequestMethod.GET)@ResponseStatus(HttpStatus.OK)public String validString(@RequestParam(value = "str", defaultValue = "")@Size(min = 1, max = 3)String vStr){return vStr;} }

代碼

在github中查看完整代碼

參考

Bean Validation 技術(shù)規(guī)范特性概述
Validation, Data Binding, and Type Conversion

來源：?http://www.cnblogs.com/xiaohunshi/p/5693449.html

來自為知筆記(Wiz)

轉(zhuǎn)載于:https://www.cnblogs.com/jeffen/p/6402475.html

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