玻璃杯中的花生壳--spring 中的拦截器

[java]spring 中的拦截器

[ 2006/8/4 16:11:53 | By: 玻璃杯中的花生壳 ]

1.自定义被拦截的接口，且实现接口。代码: 500)this.width=500'>package demo;500)this.width=500'>public interface UserService //被拦截的接口500)this.width=500'>500)this.width=500'>500)this.width=500'>{500)this.width=500'> public void printUser(String user);500)this.width=500'>}500)this.width=500'>500)this.width=500'>500)this.width=500'>package demo;500)this.width=500'>public class UserServiceImp extends UserService //实现UserService接口500)this.width=500'>500)this.width=500'>500)this.width=500'>{500)this.width=500'> public void printUser(String user)500)this.width=500'>500)this.width=500'> 500)this.width=500'>{500)this.width=500'> System.out.println("printUser user:"+user);//显示user 500)this.width=500'> }500)this.width=500'>}2 实现AOP的方法级拦截器。它可以在目标操作前后执行，拦截自定义接口的参数，或拦截接口返回的值。代码: 500)this.width=500'>package demo;500)this.width=500'>import org.aopalliance.intercept.MethodInterceptor;500)this.width=500'>import org.aopalliance.intercept.MethodInvocation;500)this.width=500'>500)this.width=500'>public class UserInterceptor implements MethodInterceptor500)this.width=500'> //AOP方法拦截器500)this.width=500'>500)this.width=500'> 500)this.width=500'>{500)this.width=500'>500)this.width=500'>500)this.width=500'> public Object invoke(MethodInvocation arg0) throws Throwable 500)this.width=500'>{500)this.width=500'> 500)this.width=500'>500)this.width=500'> try 500)this.width=500'>{500)this.width=500'> 500)this.width=500'> if (arg0.getMethod().getName().equals("printUser"))500)this.width=500'> //拦截方法是否是UserService接口的printUser方法 500)this.width=500'>500)this.width=500'> 500)this.width=500'>{500)this.width=500'> Object[] args = arg0.getArguments();//被拦截的参数500)this.width=500'> System.out.println("user:"+args[0]);500)this.width=500'> arg0.getArguments()[0]="hello!" //修改被拦截的参数500)this.width=500'> 500)this.width=500'> 500)this.width=500'> }500)this.width=500'> 500)this.width=500'> System.out.println(arg0.getMethod().getName() + "---!");500)this.width=500'> return arg0.proceed();//运行UserService接口的printUser方法500)this.width=500'>500)this.width=500'>500)this.width=500'> } catch (Exception e) 500)this.width=500'>{500)this.width=500'> throw e;500)this.width=500'> }500)this.width=500'> }3. ApplicationContext.xml的设置 500)this.width=500'><?xml version="1.0" encoding="UTF-8"?>500)this.width=500'> <!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">500)this.width=500'> 500)this.width=500'> <beans>500)this.width=500'> <bean id="userServiceImp" class="demo.UserServiceImp”>500)this.width=500'> </bean>500)this.width=500'> 500)this.width=500'> 500)this.width=500'> 500)this.width=500'> <bean id="userInterceptor" class="demo.UserInterceptor">500)this.width=500'> </bean>500)this.width=500'> 500)this.width=500'> 500)this.width=500'> 500)this.width=500'> <bean id="userService" 500)this.width=500'> class="org.springframework.aop.framework.ProxyFactoryBean">500)this.width=500'> <property name="proxyInterfaces"><value>demo.UserService</value></property>500)this.width=500'> 500)this.width=500'> <property name="target"><ref local="userServiceImp"/></property>500)this.width=500'> <property name="interceptorNames">500)this.width=500'> <list>500)this.width=500'> <value>userInterceptor</value>500)this.width=500'> </list>500)this.width=500'> </property>500)this.width=500'> </bean>500)this.width=500'> 500)this.width=500'> </beans>500)this.width=500'>4.运行 500)this.width=500'>package demo;500)this.width=500'> import org.springframework.context.ApplicationContext;500)this.width=500'> import org.springframework.context.support.FileSystemXmlApplicationContext;500)this.width=500'> 500)this.width=500'> public class DemoApp500)this.width=500'>500)this.width=500'> 500)this.width=500'>{500)this.width=500'> public static void main(String[] args)500)this.width=500'>500)this.width=500'> 500)this.width=500'>{500)this.width=500'> ApplicationContext ac = new FileSystemXmlApplicationContext(500)this.width=500'> "classpath:ApplicationContext.xml");500)this.width=500'> UserService us = (UserService) ac.getBean("userService");500)this.width=500'> String user="zhao";500)this.width=500'>500)this.width=500'> us.printUser("zhao");500)this.width=500'>500)this.width=500'> }500)this.width=500'> } 运行结果： [java] user:zhao [java] printUser user:hello!

阅读全文(2612) | 回复(1) | 编辑 | 精华

回复:spring 中的拦截器

[ 2006/8/4 16:53:22 | By: 玻璃杯中的花生壳 ]

运行的过程中发生错误，没有找到applicationContext.xml文件，查找了一下原因，发生将applicationContext.xml文件放错了位置，放在packge下，正确的应该是放在src目录下

个人主页 | 引用回复 | 主人回复 | 返回 | 编辑 | 删除

» 1 »

发表评论：

昵称：
密码：
主页：
标题：

验证码： (不区分大小写,请仔细填写,输错需重写评论内容！)