quaff http://quaff.javaeye.com UTF-8 Copyright 2003-2008, JavaEye.com http://blogs.law.harvard.edu/tech/rss JavaEye - 做最棒的软件开发交流社区 使用mixin来记录bean属性的改变 quaff 作者: quaff  链接：http://quaff.javaeye.com/blog/97704  发表时间: 2007年07月04日

声明：本文系JavaEye网站发布的原创博客文章，未经作者书面许可，严禁任何网站转载本文，否则必将追究法律责任！

先定义一个需要被introduce的interface
java 代码
 
  1. public interface EditAware {  
  2.   
  3.     public Object getOldValue(String propertyName);  
  4.   
  5.     public boolean isEdited(String propertyName);  
  6.   
  7. }  
再写这个interface的mixin
java 代码
 
  1. import org.aopalliance.intercept.MethodInvocation;  
  2. import org.apache.commons.beanutils.PropertyUtils;  
  3. import org.apache.commons.lang.StringUtils;  
  4. import org.springframework.aop.support.DelegatingIntroductionInterceptor;  
  5.   
  6. public class EditAwareMixin extends DelegatingIntroductionInterceptor implements  
  7.         EditAware {  
  8.   
  9.     private transient Map map = new HashMap();  
  10.   
  11.     public Object getOldValue(String propertyName) {  
  12.         return map.get(propertyName);  
  13.     }  
  14.   
  15.     public boolean isEdited(String propertyName) {  
  16.         return map.containsKey(propertyName);  
  17.     }  
  18.   
  19.     public Object invoke(MethodInvocation invocation) throws Throwable {  
  20.         if (invocation.getMethod().getName().indexOf("set") == 0) {  
  21.             Object _this = invocation.getThis();  
  22.             String propertyName = invocation.getMethod().getName().substring(3);  
  23.             propertyName = StringUtils.uncapitalize(propertyName);  
  24.             Object oldValue = PropertyUtils.getProperty(_this, propertyName);  
  25.             Object newValue = invocation.getArguments()[0];  
  26.             if (!isEquals(oldValue, newValue))  
  27.                 map.put(propertyName, oldValue);  
  28.         }  
  29.         return super.invoke(invocation);  
  30.     }  
  31.   
  32.     public static boolean isEquals(Object oldValue, Object newValue) {  
  33.         if (oldValue == null && newValue == null)  
  34.             return true;  
  35.         if (oldValue != null)  
  36.             return oldValue.equals(newValue);  
  37.         else  
  38.             return newValue.equals(oldValue);  
  39.     }  
  40. }  
最后是怎么使用这个mixin
java 代码
 
  1. import org.springframework.aop.framework.ProxyFactory;  
  2. import org.springframework.beans.BeanUtils;  
  3.   
  4. public class Main {  
  5.   
  6.     public static void main(String[] args) {  
  7.         User u1 = new User("username1", "password1");  
  8.         User u2 = new User("username2", "password2");  
  9.         ProxyFactory pc = new ProxyFactory();  
  10.         pc.setProxyTargetClass(true);  
  11.         pc.setTargetClass(u1.getClass());  
  12.         pc.addAdvice(new EditAwareMixin());  
  13.         pc.setTarget(u1);  
  14.         u1 = (User) pc.getProxy();  
  15.         BeanUtils.copyProperties(u2, u1);  
  16.         EditAware ea = (EditAware) u1;  
  17.         System.out.println(ea.isEdited("username"));  
  18.         System.out.println(ea.getOldValue("username"));  
  19.     }  
  20.   
  21.     public static class User {  
  22.         private String username;  
  23.         private String password;  
  24.   
  25.         public User() {  
  26.   
  27.         }  
  28.   
  29.         public User(String username, String password) {  
  30.             this.username = username;  
  31.             this.password = password;  
  32.         }  
  33.   
  34.         public String getUsername() {  
  35.             return username;  
  36.         }  
  37.   
  38.         public void setUsername(String username) {  
  39.             this.username = username;  
  40.         }  
  41.   
  42.         public String getPassword() {  
  43.             return password;  
  44.         }  
  45.   
  46.         public void setPassword(String password) {  
  47.             this.password = password;  
  48.         }  
  49.   
  50.     }  
  51. }  

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]]> Wed, 04 Jul 2007 11:42:30 +0800 http://quaff.javaeye.com/blog/97704 http://quaff.javaeye.com/blog/97704 Spring容器外注入依赖 quaff 作者: quaff  链接：http://quaff.javaeye.com/blog/32364  发表时间: 2006年11月03日

声明：本文系JavaEye网站发布的原创博客文章，未经作者书面许可，严禁任何网站转载本文，否则必将追究法律责任！ 

package test;

import org.springframework.beans.factory.annotation.Configurable;

@Configurable("testBean")
public class TestBean {
	private TestService testService;

	public TestService getTestService() {
		return testService;
	}
	public void setTestService(TestService testService) {
		this.testService = testService;
	}

}


package test;

public class TestService {
	public String sayHello() {
		return "Hello";
	}
}


<?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:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd">
<aop:spring-configured />
<bean id="testService" class="test.TestService"
depends-on="org.springframework.beans.factory.aspectj.AnnotationBeanConfigurerAspect" />
<bean id="testBean" class="test.TestBean" scope="prototype">
<property name="testService" ref="testService" />
</bean>
</beans>

在META-INF里面加入aop.xml
<!DOCTYPE aspectj PUBLIC
"-//AspectJ//DTD//EN" "http://www.eclipse.org/aspectj/dtd/aspectj.dtd">
<aspectj>
<aspects>
<include
within="org.springframework.beans.factory.aspectj.AnnotationBeanConfigurerAspect" />
</aspects>
<weaver
<include within="test.TestBean" />
</weaver>
</aspectj>

用的是aspectj的加载期植入代码,jvm的启动参数加上-javaagent:aspectjweaver.jar

现在来测试

package test;

import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Main {

public static void main(String... strings) {
ClassPathXmlApplicationContext ctx = new ClassPathXmlApplicationContext(
"applicationContext-test.xml");
TestBean bean = new TestBean();
System.out.println(bean.getTestService());
}

}
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]]> Fri, 03 Nov 2006 20:06:47 +0800 http://quaff.javaeye.com/blog/32364 http://quaff.javaeye.com/blog/32364 动态配置Acegi权限 quaff 作者: quaff  链接：http://quaff.javaeye.com/blog/28734  发表时间: 2006年10月19日

声明：本文系JavaEye网站发布的原创博客文章，未经作者书面许可，严禁任何网站转载本文，否则必将追究法律责任！

AbstractRefreshableTargetSource在spring2.0里面才有 

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

import org.acegisecurity.intercept.web.FilterInvocationDefinitionSourceEditor;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.aop.target.dynamic.AbstractRefreshableTargetSource;
import org.springframework.core.io.Resource;
import org.springframework.core.io.ResourceEditor;

public class RefreshableFileFilterInvocationDefinition extends
		AbstractRefreshableTargetSource {
	protected Log logger = LogFactory.getLog(getClass());
	public static final String DEFAULT_LOCATION = "classpath:acegi-filterInvocation.conf";
	private String location = DEFAULT_LOCATION;
	public String getLocation() {
		return location;
	}
	public void setLocation(String location) {
		this.location = location;
	}
	protected Object freshTarget() {
		ResourceEditor editor = new ResourceEditor();
		editor.setAsText(getLocation());
		Resource resource = (Resource) editor.getValue();
		if (resource == null) {
			logger
					.warn("Can't find a Acegi FilterInvocationDefinition config file");
			return null;
		}
		StringBuffer sb = new StringBuffer();
		char[] cbuf = new char[100];
		int read;
		InputStream is = null;
		InputStreamReader isr = null;
		try {
			is = resource.getInputStream();
			isr = new InputStreamReader(is);
			while ((read = (isr.read(cbuf, 0, cbuf.length))) != -1)
				sb.append(cbuf, 0, read);
			logger.info("loaded Acegi FilterInvocationDefinition config file");
		} catch (IOException e) {
			logger.warn(e.getMessage(), e);
		} finally {
			try {
				if (isr != null)
					isr.close();
				if (is != null)
					is.close();
			} catch (IOException e) {
				logger.warn(e.getMessage(), e);
			}
		}
		FilterInvocationDefinitionSourceEditor configEditor = new FilterInvocationDefinitionSourceEditor();
		configEditor.setAsText(sb.toString());
		return configEditor.getValue();
	}

}


acegi的spring配置文件

<bean id="filterInvocationInterceptor"
class="org.acegisecurity.intercept.web.FilterSecurityInterceptor">
<property name="authenticationManager"
ref="authenticationManager" />
<property name="accessDecisionManager"
ref="httpRequestAccessDecisionManager" />
<property name="objectDefinitionSource"
ref="objectDefinitionSource" />
</bean>

<bean id="refreshableFileFilterInvocationDefinition"
class="RefreshableFileFilterInvocationDefinition">
<property name="location" value="file:///${webapp.root}/WEB-INF/acegi-filterInvocation.conf"/>
<!-- 自动刷新
<property name="refreshCheckDelay" value="60000"/>
-->
</bean>

<bean id="objectDefinitionSource"
class="org.springframework.aop.framework.ProxyFactoryBean">
<property name="targetSource"
ref="refreshableFileFilterInvocationDefinition" />
</bean>


也可以用dwr来手动刷新,并且配置权限,role是在acegi里面配置的

<create creator="spring" javascript="FilterInvocationDefinition"
scope="application">
<param name="beanName" value="refreshableFileFilterInvocationDefinition" />
<auth method="refresh" role="ROLE_SUPERVISOR"/>
<include method="refresh" />
</create>
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]]> Thu, 19 Oct 2006 19:20:52 +0800 http://quaff.javaeye.com/blog/28734 http://quaff.javaeye.com/blog/28734