<dubbo:reference interface="com.xxx.MenuService" group="*" merger="true" />

<dubbo:reference interface="com.xxx.MenuService" group="aaa,bbb" merger="true" />

<dubbo:reference interface="com.xxx.MenuService" group="*">

    <dubbo:method name="getMenuItems" merger="true" />

</dubbo:service>

<dubbo:reference interface="com.xxx.MenuService" group="*" merger="true">

    <dubbo:method name="getMenuItems" merger="false" />

</dubbo:service>

<dubbo:reference interface="com.xxx.MenuService" group="*">

    <dubbo:method name="getMenuItems" merger="mymerge" />

</dubbo:service>

<dubbo:reference interface="com.xxx.MenuService" group="*">

    <dubbo:method name="getMenuItems" merger=".addAll" />

</dubbo:service>

import java.io.Serializable;

import java.util.Date;

import javax.validation.constraints.Future;

import javax.validation.constraints.Max;

import javax.validation.constraints.Min;

import javax.validation.constraints.NotNull;

import javax.validation.constraints.Past;

import javax.validation.constraints.Pattern;

import javax.validation.constraints.Size;

public class ValidationParameter implements Serializable {

    private static final long serialVersionUID = 7158911668568000392L;

    @NotNull // 不允許為空

    @Size(min = 1, max = 20) // 長度或大小範圍

    private String name;

    @NotNull(groups = ValidationService.Save.class) // 儲存時不允許為空，更新時允許為空 ，表示不更新該欄位

    @Pattern(regexp = "^\\s*\\w+(?:\\.{0,1}[\\w-]+)*@[a-zA-Z0-9]+(?:[-.][a-zA-Z0-9]+)*\\.[a-zA-Z]+\\s*$")

    private String email;

    @Min(18) // 最小值

    @Max(100) // 最大值

    private int age;

    @Past // 必須為一個過去的時間

    private Date loginDate;

    @Future // 必須為一個未來的時間

    private Date expiryDate;

    public String getName() {

        return name;

    }

    public void setName(String name) {

        this.name = name;

    }

    public String getEmail() {

        return email;

    }

    public void setEmail(String email) {

        this.email = email;

    }

    public int getAge() {

        return age;

    }

    public void setAge(int age) {

        this.age = age;

    }

    public Date getLoginDate() {

        return loginDate;

    }

    public void setLoginDate(Date loginDate) {

        this.loginDate = loginDate;

    }

    public Date getExpiryDate() {

        return expiryDate;

    }

    public void setExpiryDate(Date expiryDate) {

        this.expiryDate = expiryDate;

    }

}

public interface ValidationService { // 預設可按服務介面區分驗證場景，如：@NotNull(groups = ValidationService.class)

@interface Save{} // 與方法同名介面，首字母大寫，用於區分驗證場景，如：@NotNull(groups = ValidationService.Save.class)，

可選

    void save(ValidationParameter parameter);

    void update(ValidationParameter parameter);

}

import javax.validation.GroupSequence;

public interface ValidationService {

    @GroupSequence(Update.class) // 同時驗證Update組規則

    @interface Save{}

    void save(ValidationParameter parameter);

    @interface Update{}

    void update(ValidationParameter parameter);

}

import javax.validation.constraints.Min;

import javax.validation.constraints.NotNull;

public interface ValidationService {

    void save(@NotNull ValidationParameter parameter); // 驗證引數不為空

    void delete(@Min(1) int id); // 直接對基本型別引數驗證

}

<dubbo:reference id="validationService" interface="com.alibaba.dubbo.examples.validation.api.ValidationService"

validation="true" />

<dubbo:service interface="com.alibaba.dubbo.examples.validation.api.ValidationService" ref="validationService"

validation="true" />

import javax.validation.ConstraintViolationException;

import javax.validation.ConstraintViolationException;

import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.alibaba.dubbo.examples.validation.api.ValidationParameter;

import com.alibaba.dubbo.examples.validation.api.ValidationService;

import com.alibaba.dubbo.rpc.RpcException;

public class ValidationConsumer {

    public static void main(String[] args) throws Exception {

        String config = ValidationConsumer.class.getPackage().getName().replace('.', '/') + "/validation-consumer.xml";

        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(config);

        context.start();

        ValidationService validationService = (ValidationService)context.getBean("validationService");

        // Error

        try {

            parameter = new ValidationParameter();

            validationService.save(parameter);

            System.out.println("Validation ERROR");

        } catch (RpcException e) { // 丟擲的是RpcException

            ConstraintViolationException ve = (ConstraintViolationException) e.getCause();

// 裡面嵌了一個ConstraintViolationException

            Set<ConstraintViolation<?>> violations = ve.getConstraintViolations(); // 可以拿到一個驗證錯誤詳細資訊的集合

            System.out.println(violations);

        }

    }

}

<dependency>

    <groupId>javax.validation</groupId>

    <artifactId>validation-api</artifactId>

    <version>1.0.0.GA</version>

</dependency>

<dependency>

    <groupId>org.hibernate</groupId>

    <artifactId>hibernate-validator</artifactId>

    <version>4.2.0.Final</version>

</dependency>