请求参数验证(1)-javax.validation

一、pom加入如下配置

<dependency>
  <groupId>javax.validation</groupId>
  <artifactId>validation-api</artifactId>
  <version>1.1.0.Final</version>
</dependency>

二、加注解

@RestController
public class TokenController {

    @InitBinder
    public void initBinder(DataBinder binder){
        binder.setValidator(new TokenValidator());
    }
    @RequestMapping("/token")
    public String token(@ModelAttribute @Valid TokenCommand tokenCommand, BindingResult bindingResult){
        if(bindingResult.hasErrors()){
            StringBuffer stringBuffer = new StringBuffer();
            for (ObjectError objectError : bindingResult.getAllErrors()) {
                stringBuffer.append(objectError.getCode());
            }
            return String.valueOf(stringBuffer);
        }

        return tokenCommand.getAppId();
    }

}

在请求参数前面加入@Valid，后面跟上BindingResult

BindResult result必须紧跟着前面的@ModelAttribute， 否则会出错

方法上面加

    @InitBinder
    public void initBinder(DataBinder binder){
        binder.setValidator(new TokenValidator());
    }

三、写验证类

public class TokenValidator implements Validator {
    @Override
    public boolean supports(Class<?> aClass) {
        return aClass.equals(TokenCommand.class);
    }

    //supports返回true执行
    @Override
    public void validate(Object o, Errors errors) {
        TokenCommand tokenCommand = (TokenCommand) o;
        if (tokenCommand.getAppId() == null || tokenCommand.getAppKey() == null) {
            errors.reject("appid and appkey can not be null");
        }
        if(tokenCommand.getAppId().length() < 6){
            errors.reject("appid length less than 6");
        }
        if(tokenCommand.getAppKey().length() < 6){
            errors.reject("appkey length less than 6");
        }
    }
}

类要实现Validator，引入的是sring包的。

supprots返回true的情况下执行validate

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