spring的IOC非常的强大。。特别是管理Web项目中的自动加载。
但是实际应用中，可能会碰到这样两类的问题：
1.写UnitTest的时候，需要脱离容器，手动读取xml文件加载bean。
2.在一个Web容器中，可能某个脱离了spring管理（也就是一个非bean）的类，需要感知并读取某个spring容易的bean。
下面转了2篇文章，分别是对应上面2个问题的解决方案
http://hi.baidu.com/%C9%CF%B5%DB%D2%B2%B7%B8%C0%A7/blog/item/f934474a104c3e2008f7ef66.html
Spring中读取bean配置文件的几种方式
BeanFactory允许InputStream作为构造函数的参数，也可以org.springframework.core.io.Resource接口。下面这个例子是用ClassPathResource作为参数：
Resource resource = new ClassPathResource("bean.xml");
BeanFactory factory = new XmlBeanFactory(resource);
ActionBean action = (ActionBean) factory.getBean("actionBean");
如果同一个Bean在配置文件有多个bean的定义，则用下面的方法取得所有的对象：
Resource resource = new ClassPathResource("bean.xml");
ListableBeanFactory factory = new XmlBeanFactory(resource);
Map helloBeans = factory.getBeansOfType(ActionBean.class, false, false);
一个应用程序中往往有很多的Bean要放在配置文件，如果所有的Bean都放在一个文件中，维护起来就相当的麻烦，这时我们可以按照模块把每个模块用到Bean放到不同的配置文件，Spring提供了相应的方法：
BeanDefinitionRegistry reg = new DefaultListableBeanFactory();
XmlBeanDefinitionReader reader = new XmlBeanDefinitionReader(reg);
// 載入bean定義檔
reader.loadBeanDefinitions(new ClassPathResource("bean1.xml"));
reader.loadBeanDefinitions(new ClassPathResource("bean2.xml"));
....
// 取得Bean
BeanFactory bf = (BeanFactory) reg;
Object o = bf.getBean("actionBean");
===================================================================
读取配置文件的几种方法
在读spring in aciton 时，他用的BeanFactory factory = new XmlBeanFactory(new FileInputStream("hello.xml"));
可是现在的用的1.2.6版本的构造器(XmlBeanFactory)只能接收Resource接口了，所以调不出来是正常的事情，假设现在有一个文件hello.xml
读取方法
1:ApplicationContext cx=new FileSystemXmlApplicationContext("hello.xml");//指定的路径去找文件
2:ApplicationContext factory = new ClassPathXmlApplicationContext("hello.xml");//还会在classpath去找
3:Resource fa = new FileSystemResource("hello.xml");
BeanFactory factory=new XmlBeanFactory(fa);
4:这个要设制classpath了，麻烦
Resource res = new ClassPathResource("com/springinaction/chapter01/hello/hello.xml");
BeanFactory factory=new XmlBeanFactory(res);
好了，用了上面那种方法都可以调用getBean("your bean name")了，
eg: BeanFactory factory=new XmlBeanFactory(fa);
hello he=(hello)factory.getBean("hello");
he.getHello();
================================================================================
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http://babycountry.spaces.live.com/blog/cns!18767b1e2eb6d0e1!236.entry
spring 读取注册bean的一些方法(转)
我现在在做的东西,主要用到了框架是struts2+hibernate+spring开发一个上传,下载,播放视频,听歌的东西,在做到获得到注册bean的时候,我想通过在web.xml配置context-param中获得,但老也不成功,后来在网站上看到别人写的,共同分享:
通过几个项目的实践总结一下几种获得spring里注册Bean的方法：
一：方法一（多在struts框架中）继承BaseDispatchAction
1234567891011121314151617181920212223242526272829303132333435363738394041 package com.mas.wawacommunity.wap.web.action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionServlet;
import org.apache.struts.actions.DispatchAction;
import org.springframework.web.context.WebApplicationContext;
import org.springframework.web.context.support.WebApplicationContextUtils;
import com.mas.wawacommunity.wap.service.UserManager;
public class BaseDispatchAction extends DispatchAction {
/**
* web应用上下文环境变量
*/
protected WebApplicationContext ctx;
protected UserManager userMgr;
/**
* 获得注册Bean
* @param beanName String 注册Bean的名称
* @return
*/
protected final Object getBean(String beanName) {
return ctx.getBean(beanName);
}
protected ActionForward unspecified(ActionMapping mapping, ActionForm form,
javax.servlet.http.HttpServletRequest request,
javax.servlet.http.HttpServletResponse response) {
return mapping.findForward("index");
}
public void setServlet(ActionServlet servlet) {
this.servlet = servlet;
this.ctx = WebApplicationContextUtils.getWebApplicationContext(servlet.getServletContext());
this.userMgr = (UserManager) getBean("userManager");
}
}
action调用：
123456789101112131415161718192021222324252627282930313233343536373839 package com.mas.wawacommunity.wap.web.action;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionServlet;
import com.mas.wawacommunity.wap.model.News;
import com.mas.wawacommunity.wap.service.NewsManager;
public class NewsAction extends BaseDispatchAction {
NewsManager newsManager;
public void setServlet(ActionServlet servlet) {
super.setServlet(servlet);
newsManager = (NewsManager) this.getBean("newsManager");
}
/**
* 得到新闻列表
* @param mapping
* @param form
* @param request
* @param resp
* @return
*/
public ActionForward getNewsList(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse resp) {
int category = Text.parseInt(request, "category", 0);
int pageNo = Text.parseInt(request, "pageNo", 1);
int pageSize = Text.parseInt(request, "pageSize", 9);
PageRoll pageRoll = newsManager.getAllNews(category, pageNo, pageSize);
request.setAttribute("pageRoll", pageRoll);
return mapping.findForward("news.list");
}
}
二：方法二实现BeanFactoryAware
1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253 package com.anymusic.oa.commons.service;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.BeanFactoryAware;
/**
* Created by IntelliJ IDEA.
* User: Weany
* Date: 2006-4-2
* Time: 2:46:51
* To change this template use File | Settings | File Templates.
*/
public class ServiceLocator implements BeanFactoryAware {
private static BeanFactory beanFactory = null;
private static ServiceLocator servlocator = null;
public void setBeanFactory(BeanFactory factory) throws BeansException {
this.beanFactory = factory;
}
public BeanFactory getBeanFactory() {
return beanFactory;
}
/**
* 创建读取Bean服务类实例(从spring.xml中加载)
* <bean id="serviceLocator" class="com.am.oa.commons.service.ServiceLocator" singleton="true" />
*/
public static ServiceLocator getInstance() {
if (servlocator == null)
servlocator = (ServiceLocator) beanFactory.getBean("serviceLocator");
return servlocator;
}
/**
* 根据提供的bean名称得到相应的服务类
* @param servName bean名称
*/
public static Object getService(String servName) {
return beanFactory.getBean(servName);
}
/**
* 根据提供的bean名称得到对应于指定类型的服务类
* @param servName bean名称
* @param clazz 返回的bean类型,若类型不匹配,将抛出异常
*/
public static Object getService(String servName, Class clazz) {
return beanFactory.getBean(servName, clazz);
}
}
action调用:
1234567891011121314151617181920212223242526272829303132333435363738 package com.anymusic.oa.webwork;
import java.util.List;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import com.anymusic.oa.commons.service.ServiceLocator;
import com.anymusic.oa.hibernate.pojo.Role;
import com.anymusic.oa.hibernate.pojo.Users;
import com.anymusic.oa.spring.IUserService;
import com.opensymphony.webwork.ServletActionContext;
import com.opensymphony.xwork.Action;
import com.opensymphony.xwork.ActionContext;
import com.opensymphony.xwork.ModelDriven;
public class UserAction extends BaseAction implements Action,ModelDriven{
private Users user = new Users();
protected ServiceLocator service = ServiceLocator.getInstance();
UserService userService = (UserService)service.getService("userService");
public String execute() throws Exception {
return SUCCESS;
}
public Object getModel() {
return user;
}
public String getAllUser(){
HttpServletRequest request = ServletActionContext.getRequest();
List ls=userService.LoadAllObject( Users.class );
request.setAttribute("user",ls);
this.setUrl("/yonghu.jsp");
return SUCCESS;
}
}
三：方法三实现ApplicationContextAware
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687 package com.easou.framework.common.util;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.NoSuchBeanDefinitionException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
public class SpringContextUtil implements ApplicationContextAware {
private static ApplicationContext applicationContext; //Spring应用上下文环境
/**
* 实现ApplicationContextAware接口的回调方法，设置上下文环境
* @param applicationContext
* @throws BeansException
*/
public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
SpringContextUtil.applicationContext = applicationContext;
}
/**
* @return ApplicationContext
*/
public static ApplicationContext getApplicationContext() {
return applicationContext;
}
/**
* 获取对象
* @param name
* @return Object 一个以所给名字注册的bean的实例
* @throws BeansException
*/
public static Object getBean(String name) throws BeansException {
return applicationContext.getBean(name);
}
/**
* 获取类型为requiredType的对象
* 如果bean不能被类型转换，相应的异常将会被抛出（BeanNotOfRequiredTypeException）
* @param name bean注册名
* @param requiredType 返回对象类型
* @return Object 返回requiredType类型对象
* @throws BeansException
*/
public static Object getBean(String name, Class requiredType) throws BeansException {
return applicationContext.getBean(name, requiredType);
}
/**
* 如果BeanFactory包含一个与所给名称匹配的bean定义，则返回true
* @param name
* @return boolean
*/
public static boolean containsBean(String name) {
return applicationContext.containsBean(name);
}
/**
* 判断以给定名字注册的bean定义是一个singleton还是一个prototype。
* 如果与给定名字相应的bean定义没有被找到，将会抛出一个异常（NoSuchBeanDefinitionException）
* @param name
* @return boolean
* @throws NoSuchBeanDefinitionException
*/
public static boolean isSingleton(String name) throws NoSuchBeanDefinitionException {
return applicationContext.isSingleton(name);
}
/**
* @param name
* @return Class 注册对象的类型
* @throws NoSuchBeanDefinitionException
*/
public static Class getType(String name) throws NoSuchBeanDefinitionException {
return applicationContext.getType(name);
}
/**
* 如果给定的bean名字在bean定义中有别名，则返回这些别名
* @param name
* @return
* @throws NoSuchBeanDefinitionException
*/
public static String[] getAliases(String name) throws NoSuchBeanDefinitionException {
return applicationContext.getAliases(name);
}
}
action调用：
1234567891011121314151617181920212223242526272829303132333435363738 package com.anymusic.oa.webwork;
import java.util.List;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import com.anymusic.oa.commons.service.ServiceLocator;
import com.anymusic.oa.hibernate.pojo.Role;
import com.anymusic.oa.hibernate.pojo.Users;
import com.anymusic.oa.spring.IUserService;
import com.opensymphony.webwork.ServletActionContext;
import com.opensymphony.xwork.Action;
import com.opensymphony.xwork.ActionContext;
import com.opensymphony.xwork.ModelDriven;
public class UserAction extends BaseAction implements Action,ModelDriven{
private Users user = new Users();
UserService userService = (UserService) SpringContextUtil.getBean("userService");
public String execute() throws Exception {
return SUCCESS;
}
public Object getModel() {
return user;
}
public String getAllUser(){
HttpServletRequest request = ServletActionContext.getRequest();
List ls=userService.LoadAllObject( Users.class );
request.setAttribute("user",ls);
this.setUrl("/yonghu.jsp");
return SUCCESS;
}
}
本文来自CSDN博客，转载请标明出处：http://blog.csdn.net/d8111/archive/2008/08/31/2856601.aspx
posted on 2009-10-14 18:01
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