dreamvc框架(一)ioc容器的集成

我的dreamvc框架最终写得差点儿相同了，借鉴了非常多开源框架，SpringMVC、Struts2等，眼下放在github上面。地址请猛戳我

写得差点儿相同了，是要写一个总结，把自己当时的思路记录下来！还有很多其它的工作要做！

（一）

首先,IOC容器作为管理bean的重要工具，我们在日常的开发其中经经常使用到，最经常使用的就属SPRINGIOC了吧！当然，假设开发人员不原理是用SPRINGIOC。那么你能够实现自己的容器，或者是用其它的3方ioc工具。仅仅要实现dreamvc提供的IocFactory或者继承AbstractIocFactory。请看以下这个接口

package org.majorxie.dreamvc.ioc.factory;

import java.util.List;

import javax.servlet.ServletConfig;
import javax.servlet.ServletContext;

/**
 *IOC 容器 工厂接口
 *
 * @author xiezhaodong(majorxie@139.com)
 *2014-10-24
 */
public interface IocFactory {
	/**
	 * 载入容器
	 * @param config
	 */
	void init(ServletContext context);

	/**
	 * destory ioc
	 */
	void destroy();	

	/**
	 * 得到全部的controller对象
	 * @return
	 */
	List<Object> getControllers()throws Exception;

	/**
	 * 是否是拦截器
	 * @return
	 */
	List<Object> getInterceptors();

	/**
	 * 得到其它对象
	 * @return
	 */
	List<Object> getOthers();

}

package org.majorxie.dreamvc.ioc.factory;

import java.util.List;

/**
 * 假设是Spring容器就让他自己destory,其它的能够继承该类覆盖此方法
 * 假设想要扩展ioc，则能够选择使用extends还是implements
 *  @author xiezhaodong
 *2014-10-25
 */
public abstract class AbstractIocFactory implements IocFactory {
	/**
	 * 默认实现为空
	 */
	public void destroy() {

	}

	public List<Object> getOthers() {

		return null;
	}

}

开发人员依照接口定义内容。封装好自己的controller和Interceptor。然后在web.xml里面配置实现类的路径即可了。dreamvc已经默认的实现了springioc。请看实现类

package org.majorxie.dreamvc.ioc.factory;

import java.util.ArrayList;
import java.util.List;

import javax.servlet.ServletContext;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.majorxie.dreamvc.exception.NotHaveControllerException;
import org.majorxie.dreamvc.interceptor.Interceptor;
import org.majorxie.dreamvc.tag.Controller;
import org.springframework.context.ApplicationContext;
import org.springframework.web.context.support.WebApplicationContextUtils;

/**
 * Spring容器的实现,我们让spring去destory所以继承的abstract
 *
 * @author xiezhaodong 2014-10-25 01:34
 *
 */
public class SpringIocFactory extends AbstractIocFactory {
	private final Log log = LogFactory.getLog(SpringIocFactory.class);

	private ApplicationContext applicationContext;
	private List<Object> controllerBeans = new ArrayList<Object>();
	private List<Object> otherBeans = new ArrayList<Object>();
	private List<Object> interceptorBeans = new ArrayList<Object>();

	public void init(ServletContext context) {
		log.info("init context...");
		applicationContext = WebApplicationContextUtils
				.getRequiredWebApplicationContext(context);
		initBeans();
	}

	public List<Object> getControllers() throws NotHaveControllerException {

		if (controllerBeans.size() == 0) {
			throw new NotHaveControllerException("you need at least one controller ");
		} else {
			return controllerBeans;
		}
	}

	public List<Object> getInterceptors() {
		return interceptorBeans;
	}

	/**
	 * 假设是Interceptor或者controller类。或者有着两个的注解都算是该类的类
	 * 遍历全部的bean装载到list
	 *
	 */
	@SuppressWarnings("unchecked")
	private void initBeans() {
		String[] beanNames = applicationContext.getBeanDefinitionNames();
		for (String beanName : beanNames) {
			if (applicationContext.getBean(beanName) instanceof Interceptor/*||applicationContext.getType(beanName).isAnnotationPresent(org.majorxie.dreamvc.annotation.Interceptor.class)==true*/) {
				// applicationContext.getBean(beanName, Interceptor.class);
				interceptorBeans.add(applicationContext.getBean(beanName));
				log.info("init interceptor..");
			} else

			if (applicationContext.getBean(beanName) instanceof Controller||applicationContext.getType(beanName).isAnnotationPresent(org.majorxie.dreamvc.annotation.Controller.class)==true) {
				controllerBeans.add(applicationContext.getBean(beanName));
				log.info("init controller....");
			} else {
				otherBeans.add(applicationContext.getBean(beanName));
				log.info("init others...");
			}

		}

	}

	@Override
	public List<Object> getOthers() {

		return otherBeans;
	}

}

配置web.xml载入參数

 <init-param>
    <param-name>container</param-name>
    <param-value>org.majorxie.dreamvc.ioc.factory.SpringIocFactory</param-value>
  </init-param>

ok，我们的ioc集成已经完毕了，如今就能够在application.xml配置了

<span style="white-space:pre">	</span><bean id="test" class="test.ConTest"></bean>
	<bean id="inter2" class="test.Interceptor_02"></bean>
	<bean id="inter" class="test.LoginInterceptor"></bean>

下一篇，会解说dreamvc的机制~~么么哒

转载请注明出处http://blog.csdn.net/a837199685