ssh，怎样不用applicationContext.getBean得到类实例

[ffffohno]

applicationContext是ApplicaionContext实例
如何配置可以在服务器开始时就自动加载spring配置文件，并实例里面的bean
而不需要 ApplicionContext applicationContext = new ClasspathApplicionContext（“..”）
applicationContext.getBean（".."）;

[老张-AI]

在web.xml里面配置

<listener>
  	<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>
  <context-param>
  	<param-name>contextConfigLocation</param-name>
  	<param-value>/WEB-INF/applicationContext.xml</param-value>
  </context-param>

不知道是不是你说的那样

[blliy117]

楼上正解，不用我再解释了吧！

[ffffohno]

nullpointer 啊....

[ffffohno]

第一个Bean

package com.bean;

public class User {
	private String name;
	private String pass;
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getPass() {
		return pass;
	}
	public void setPass(String pass) {
		this.pass = pass;
	}
	public void print(){
		System.out.print("av");
	}
}

第二个Bean

public class LoginAction extends Action {
	private User user;
	public void setUser(User user) {
		this.user = user;
	}
	
	public ActionForward execute(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response) {
		user.print();
		return null;
	}
}

applicationContext.xml:

<?xml version="1.0" encoding="UTF-8"?>
<beans
	xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd">
	
	<bean id="user"
		class="com.bean.User">
		<property name="name"
			value="123">
		</property>
		<property name="pass"  value="123">
		</property>
	</bean>
	<bean id ="loginAction" class="com.yourcompany.struts.action.LoginAction">
	 	<property name="user" ref="user"></property>
	</bean>
	
</beans>

web.xml:

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="2.5" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee   http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
  <servlet>
    <servlet-name>action</servlet-name>
    <servlet-class>org.apache.struts.action.ActionServlet</servlet-class>
    <init-param>
      <param-name>config</param-name>
      <param-value>/WEB-INF/struts-config.xml</param-value>
    </init-param>
    <init-param>
      <param-name>debug</param-name>
      <param-value>3</param-value>
    </init-param>
    <init-param>
      <param-name>detail</param-name>
      <param-value>3</param-value>
    </init-param>
    <load-on-startup>0</load-on-startup>
  </servlet>
  
  <servlet-mapping>
    <servlet-name>action</servlet-name>
    <url-pattern>*.do</url-pattern>
  </servlet-mapping>
  
  <listener>  
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>  
  </listener> 
  
   <context-param>
  	<param-name>contextConfigLocation</param-name>
  		<param-value>classpath*:applicationContext.xml</param-value>
  </context-param>
  
   
 
  
  
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
</web-app>

[ffffohno]

上面是大致的框架，会出现null pointer错误啊

[MaWenWu281107072139]

<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:applicationContext*.xml</param-value>
</context-param>

[youjianbo_han_87]

[Quote=引用 1 楼 zl3450341 的回复:]
在web.xml里面配置
Java code<listener><listener-class>org.springframework.web.context.ContextLoaderListener</listener-class></listener><context-param><param-name>contextConfigLocation</param-name><param-value>/WEB-INF/applicationContext.xml</param-value></context-param>


不知道是不是你说的那样
[/Quote]

[Quote=引用 6 楼 mawenwu281107072139 的回复:]
<context-param>
<param-name>contextConfigLocation </param-name>
<param-value>classpath:applicationContext*.xml </param-value>
</context-param>
[/Quote]

这种都是必须的啊，谁做web开发不在 web.xml里面配？？

楼主，你既然要用 spring，就必须按照他的BeanFactory方式参数Bean。他只是帮你new出来而已，和你自己new没有任何区别。不过他能帮你管理。

如果你不用 spring，那把类定义成，除非你把类定义成 静态类，这样加载时就不用初始化。不过静态类一般都是内部类。

[ffffohno]

谁可以贴一下 调试过的 4L的几个文件的代码啊 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

[Epiphone]

可以自己写个基类 然后子类继承它
protected static Object getBean(ServletContext servletContext,String beanName){
WebApplicationContext wac = WebApplicationContextUtils.getWebApplicationContext(servletContext);
return wac.getBean(beanName);
}
servletContext这个你因该在你的web项目中能得到的 这样就很方便的直接返回你要的bean了 HOHO~