SpringContextUtil

import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;

/**
 * 以静态变量保存Spring ApplicationContext, 可在任何代码任何地方任何时候中取出ApplicaitonContext.
 * 
 * 
 */
public class SpringContextHolder implements ApplicationContextAware {

	private static ApplicationContext applicationContext;

	/**
	 * 实现ApplicationContextAware接口的context注入函数, 将其存入静态变量.
	 */
	public void setApplicationContext(ApplicationContext applicationContext) {
		SpringContextHolder.applicationContext = applicationContext;
	}

	/**
	 * 取得存储在静态变量中的ApplicationContext.
	 */
	public static ApplicationContext getApplicationContext() {
		checkApplicationContext();
		return applicationContext;
	}

	/**
	 * 从静态变量ApplicationContext中取得Bean, 自动转型为所赋值对象的类型.
	 */
	@SuppressWarnings("unchecked")
	public static <T> T getBean(String name) {
		checkApplicationContext();
		return (T) applicationContext.getBean(name);
	}

	/**
	 * 从静态变量ApplicationContext中取得Bean, 自动转型为所赋值对象的类型.
	 * 如果有多个Bean符合Class, 取出第一个.
	 */
	@SuppressWarnings("unchecked")
	public static <T> T getBean(Class<T> requiredType) {
		checkApplicationContext();
		return (T) applicationContext.getBeansOfType(requiredType);
	}
	
	/**
	 * 清除applicationContext静态变量.
	 */
	public static void cleanApplicationContext(){
		applicationContext = null;
	}

	private static void checkApplicationContext() {
		if (applicationContext == null) {
			throw new IllegalStateException("applicaitonContext未注入);
		}
	}
}
	
 

 

import java.io.InputStream;
import java.util.Properties;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;

import org.springframework.context.ApplicationContext;
import org.springframework.web.context.support.WebApplicationContextUtils;

 * @description 初始化类，将服务器需要的东西放到缓存里
 */
@SuppressWarnings("serial")
public class InitAppContext extends HttpServlet {
	
	Properties p = null;
	
	/**
	 * Destruction of the servlet. <br>
	 */
	public void destroy() {
		super.destroy(); // Just puts "destroy" string in log
		// Put your code here
	}

	/**
	 * Initialization of the servlet. <br>
	 * Init application and using it in class that named "SpringContextUtil".
	 * 
	 * @throws ServletException
	 *             if an error occurs
	 */
	public void init() throws ServletException {
		// Put your code here
		ApplicationContext appcontext = WebApplicationContextUtils
				.getWebApplicationContext(this.getServletContext());
		SpringContextUtil springcontext = new SpringContextUtil();
		springcontext.setApplicationContext(appcontext);
		
				
	}

 

web.xml 增加servlet配置

 

	<servlet>
		<servlet-name>InitAppContext</servlet-name>
		<servlet-class>
			InitAppContext
		</servlet-class>
		<load-on-startup>1</load-on-startup>
	</servlet>