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Hello semua, saya ada soalan

spring 4.3.7
hibernate-validator-5.4.1

2. Konfigurasi adalah seperti berikut

    <bean id="messageSource"
        class="org.springframework.context.support.ReloadableResourceBundleMessageSource" name="messageSource">
        <property name="basenames">
            <list>
                <value>classpath:messages/messages</value>
                <value>classpath:messages/ValidationMessages</value>
            </list>
        </property>
        <property name="useCodeAsDefaultMessage" value="false" />
        <property name="defaultEncoding" value="UTF-8" />
        <property name="cacheSeconds" value="60" />
    </bean>

    <bean id="validator" class="org.springframework.validation.beanvalidation.LocalValidatorFactoryBean">
        <property name="providerClass" value="org.hibernate.validator.HibernateValidator"/>
        <property name="validationMessageSource" ref="messageSource"/>
    </bean>
    
    
    <mvc:annotation-driven validator="validator" />

3.kacang dan Pengawal

public class UserRequest {
    
    @NotBlank(message = "{login.valid.username.notnull}")
    private String username;
    
    @NotBlank(message = "{login.valid.password.notnull}")
    private String password;

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

}

    @RequestMapping(value = "/login", method = RequestMethod.POST)
    @ResponseBody
    public Object login(@Valid @RequestBody UserRequest ur, BindingResult result, HttpServletRequest request) {
        
        log.debug("login");
        
        if(result.hasErrors()) {  
            return result.getAllErrors().get(0);  
        } 
        
        ……
    }

Soalan:

Mengapa kita mesti menggunakan result.hasErrors() untuk memaparkan pertimbangan dalam kod?
Bukankah lebih munasabah untuk mengesahkan bahawa medan dalam UserRequest tidak memenuhi definisi dan hanya membuang pengecualian secara langsung?

@PostMapping(UriView.REST_KNOWLEDGE_POINTS) @ResponseBody public Result createKnowledgePoint(@Valid KnowledgePoint knowledgePoint, BindingResult bindingResult) { // 如有參數(shù)錯誤，則返回錯誤信息給客戶端 if (bindingResult.hasErrors()) { return Result.fail(CommonUtils.getBindingMessage(bindingResult)); } knowledgePoint.setKnowledgePointId(CommonUtils.uuid()); knowledgePoint.setName(knowledgePoint.getName().trim()); mapper.createKnowledgePoint(knowledgePoint); return Result.ok("", knowledgePoint); } /** * BindingResult 中的錯誤信息很多，對用戶不夠友好，使用 getBindingMessage() * 提取對用戶閱讀友好的定義驗證規(guī)則 message。 * * @param result 驗證的結(jié)果對象 * @return 驗證規(guī)則 message */ public static String getBindingMessage(BindingResult result) { StringBuffer sb = new StringBuffer(); for (FieldError error : result.getFieldErrors()) { // sb.append(error.getField() + " : " + error.getDefaultMessage() + "\n"); sb.append(error.getDefaultMessage() + "\n"); } return sb.toString(); }