Spring实战之方法级别缓存用法示例

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package org.crazyit.app.domain;
public class User
{
   private String name;
   private int age;
   public User()
   {}
   public User(String name, int age)
   {
      super();
      this.name = name;
      this.age = age;
   }
   public String getName()
   {
      return name;
   }
   public void setName(String name)
   {
      this.name = name;
   }
   public int getAge()
   {
      return age;
   }
   public void setAge(int age)
   {
      this.age = age;
   }
}

package org.crazyit.app.service;
import org.crazyit.app.domain.User;
public interface UserService
{
   User getUsersByNameAndAge(String name, int age);
   User getAnotherUser(String name, int age);
}

package org.crazyit.app.service.impl;
import org.crazyit.app.service.UserService;
import org.crazyit.app.domain.User;
import org.springframework.stereotype.Service;
import org.springframework.cache.annotation.Cacheable;
import org.springframework.context.annotation.Scope;
@Service("userService")
public class UserServiceImpl implements UserService
{
  @Cacheable(value = "users1")
  public User getUsersByNameAndAge(String name, int age)
  {
    System.out.println("--正在执行findUsersByNameAndAge()查询方法--");
    return new User(name, age);
  }
  @Cacheable(value = "users2")
  public User getAnotherUser(String name, int age)
  {
    System.out.println("--正在执行findAnotherUser()查询方法--");
    return new User(name, age);
  }
}

package lee;
import org.crazyit.app.service.UserService;
import org.crazyit.app.domain.User;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class SpringTest
{
  public static void main(String[] args)
  {
    ApplicationContext ctx =
      new ClassPathXmlApplicationContext("beans.xml");
    UserService us = ctx.getBean("userService" , UserService.class);
    // 第一次调用us对象的方法时会执行该方法，并缓存方法的结果
    User u1 = us.getUsersByNameAndAge("孙悟空", 500);
    // 由于getAnotherUser()方法使用另一个缓存区，
    // 因此无法使用getUsersByNameAndAge()方法缓存区的数据。
    User u2 = us.getAnotherUser("孙悟空", 500);
    System.out.println(u1 == u2); // 输出false
    // getAnotherUser("孙悟空", 500)已经执行过一次，故下面代码使用缓存
    User u3 = us.getAnotherUser("孙悟空", 500);
    System.out.println(u2 == u3); // 输出true
  }
}