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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 fly 阅读(2223) 评论(0)  编辑  收藏 所属分类: java学习

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