spring - Spring MVC - 未调用 @init binder 方法

Question

嗨，这是我的控制器

@RequestMapping(value="/home", method = RequestMethod.POST)
public String homeSubmit(@Valid LoginForm loginForm , BindingResult bindResult){

    if(bindResult.hasErrors() ||  bindResult.hasFieldErrors() ){
        return "home";
    }else{
        return "Success";
    }
}

@InitBinder("loginForm")
protected void initBinder(WebDataBinder binder) {
    binder.setValidator(new LoginFormValidator());
}

以下是我的验证器

public class LoginFormValidator implements Validator {

    public boolean supports(Class<?> classz) {
        return LoginForm.class.equals(classz); 
    }

    public void validate(Object target, Errors arg1) {
        System.out.println("inside validate method validator");
        LoginForm loginForm = (LoginForm) target;
        if(! loginForm.getUserName().equalsIgnoreCase("xxx")  ){
            arg1.rejectValue("userName","Invalid Data");
        }
        if(! loginForm.getPassword().equalsIgnoreCase("yyy")){
            arg1.rejectValue("password","Invalid Data");
        }
    }
}

问题是我的验证器并没有全部被调用。每次条件bindResult.hasErrors() || bindResult.hasFieldErrors() 都是false。我也尝试过调试..并不是所有的都被调用

Answer 1

一种方法是将 Validator 实例化为服务，并注入到您的控制器中。在您的模型上注释 @Validated。

@Autowired
@Qualifier("loginFormValidator")
private Validator validator;

@RequestMapping(value="/home", method = RequestMethod.POST)
public String homeSubmit(@Validated LoginForm loginForm , BindingResult bindResult){

    if(bindResult.hasErrors() ||  bindResult.hasFieldErrors() ){
        return "home";
    }else{
        return "Success";
    }
}

将您的验证器实例化为服务：

@Service("loginFormValidator")
public class LoginFormValidator implements Validator {

    public boolean supports(Class<?> classz) {
        return LoginForm.class.equals(classz); 
    }

    public void validate(Object target, Errors arg1) {
        System.out.println("inside validate method validator");
        LoginForm loginForm = (LoginForm) target;
        if(! loginForm.getUserName().equalsIgnoreCase("xxx")  ){
            arg1.rejectValue("userName","Invalid Data");
        }
        if(! loginForm.getPassword().equalsIgnoreCase("yyy")){
            arg1.rejectValue("password","Invalid Data");
        }
    }
}