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开始，先说一句，还是用maven的好
1、由于没用maven，和对dubbo不是很了解的原因，这次，总因为jar包不对，而导致：dubbo客户端程序，启动不起来
所以决定：将原来用过的所有jar包全部去，将dubbo-demo-provider-2.5.4-SNAPSHOT/lib下的所有jar包全部导入项目中
一切就OK了
2、服务消费者代码
import java.util.Set;
import javax.validation.ConstraintViolation;
import javax.validation.ConstraintViolationException;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import com.alibaba.dubbo.demo.ValidationParameter;
import com.alibaba.dubbo.demo.ValidationService;
import com.alibaba.dubbo.rpc.RpcException;
public class Consumer {
/**
* @param args
* @throws Exception
*/
public static void main(String[] args) throws Exception {
ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(
new String[] { "classpath:consumer.xml" });
context.start();
// DemoService demoService = (DemoService)
// context.getBean("demoService");
// while (true) {
// String hello = demoService.sayHello("world");
// System.out.println(hello);
//
// Thread.sleep(100);
// }
ValidationService validationService = (ValidationService) context.getBean("validationService");
while (true) {
ValidationParameter parameter = new ValidationParameter();
parameter.setAge(2);
parameter.setEmail("han@qq.com");
try {
String result = validationService.intsert(parameter);
System.out.println(result);
} catch (RpcException e) { // 抛出的是RpcException
ConstraintViolationException ve = (ConstraintViolationException) e.getCause(); // 里面嵌了一个ConstraintViolationException
Set<ConstraintViolation<?>> violations = ve.getConstraintViolations(); // 可以拿到一个验证错误详细信息的集合
System.out.println(violations);
}
}
}
}
3、服务消费者配置文件
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:dubbo="http://code.alibabatech.com/schema/dubbo" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsd"> <!-- 消费方应用名，用于计算依赖关系，不是匹配条件，不要与提供方一样 --> <dubbo:application name="consumer-of-helloworld-app" /> <!-- 使用zookeeper注册中心暴露发现服务地址 --> <dubbo:registry address="zookeeper://127.0.0.1:2181" /> <!-- 生成远程服务代理，可以和本地bean一样使用demoService --> <dubbo:reference id="demoService" interface="com.alibaba.dubbo.demo.DemoService" retries="2" /> <!-- 生成远程服务代理，可以和本地bean一样使用demoService --> <dubbo:reference id="validationService" interface="com.alibaba.dubbo.demo.ValidationService" retries="2" validation="true" /> </beans>
注：重点关注一下，带有下面信息的那一行，就OK了，此处表明，是在客户端侧进行参数验证
validation="true"
4、服务提供者配置文件
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:dubbo="http://code.alibabatech.com/schema/dubbo" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsd"> <!-- 提供方应用信息，用于计算依赖关系 --> <dubbo:application name="hello-world" /> <!-- 使用zookeeper注册中心暴露发现服务地址 --> <dubbo:registry address="zookeeper://127.0.0.1:2181" /> <!-- 用dubbo协议在20880端口暴露服务 --> <dubbo:protocol name="dubbo" port="20880" /> <!-- 声明需要暴露的服务接口 --> <dubbo:service interface="com.alibaba.dubbo.demo.DemoService" ref="demoService" /> <!-- 和本地bean一样实现服务 --> <bean id="demoService" class="com.alibaba.dubbo.demo.provider.DemoServiceImpl" /> <!-- 声明需要暴露的服务接口 --> <dubbo:service interface="com.alibaba.dubbo.demo.ValidationService" ref="validationService" /> <!-- 和本地bean一样实现服务 --> <bean id="validationService" class="com.alibaba.dubbo.demo.provider.ValidationServiceImpl" /> </beans>
5、服务消费者和提供者共用的类和接口
package com.alibaba.dubbo.demo;
public interface ValidationService {
@interface Intsert {
}
String intsert(ValidationParameter parameter);
}
package com.alibaba.dubbo.demo;
import java.io.Serializable;
import javax.validation.constraints.Max;
import javax.validation.constraints.Min;
import javax.validation.constraints.Pattern;
public class ValidationParameter implements Serializable {
private static final long serialVersionUID = 3469571402386167794L;
@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;
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;
}
}
6、服务提供者接口实现类
package com.alibaba.dubbo.demo.provider;
import com.alibaba.dubbo.demo.ValidationParameter;
import com.alibaba.dubbo.demo.ValidationService;
public class ValidationServiceImpl implements ValidationService {
@Override
public String intsert(ValidationParameter parameter) {
return parameter.getEmail() + "==" + parameter.getAge();
}
}
7、运行客户端程序时，控制台会输出以下信息：
[ConstraintViolationImpl{interpolatedMessage=‘最小不能小于18‘, propertyPath=age, rootBeanClass=class com.alibaba.dubbo.demo.ValidationParameter, messageTemplate=‘{javax.validation.constraints.Min.message}‘}]
8、OK，此时已经可以验证，参数验证已经开始起作用了。
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原文地址：http://my.oschina.net/hanshubo/blog/377238
