手动获取spring的ApplicationContext和bean对象

时间:2022-02-19 15:19:55

WEB项目:

方法1:

1 ApplicationContext ac1 = WebApplicationContextUtils.getRequiredWebApplicationContext(ServletContext sc)

 方法2:

1 ApplicationContext ac2 = WebApplicationContextUtils.getWebApplicationContext(ServletContext sc)

 方法3:

1 写一个工具类类继承ApplicationObjectSupport,并将这个加入到spring的容器

 方法4:

1 写一个工具类类继承WebApplicationObjectSupport,并将这个加入到spring的容器

 方法5:(推荐)

1 写一个工具类实现ApplicationContextAware接口,并将这个加入到spring的容器

 示例:

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354 import java.util.Map;import org.springframework.beans.BeansException;import org.springframework.context.ApplicationContext;import org.springframework.context.ApplicationContextAware; /** * 获取ApplicationContext和Object的工具类 * @author yzl * */@SuppressWarnings({ "rawtypes""unchecked" })public class SpringContextUtils implements ApplicationContextAware {    private static ApplicationContext applicationContext;     public void setApplicationContext(ApplicationContext arg0)            throws BeansException {        applicationContext = arg0;    }     /**     * 获取applicationContext对象     * @return     */    public static ApplicationContext getApplicationContext(){        return applicationContext;    }         /**     * 根据bean的id来查找对象     * @param id     * @return     */    public static Object getBeanById(String id){        return applicationContext.getBean(id);    }         /**     * 根据bean的class来查找对象     * @param c     * @return     */    public static Object getBeanByClass(Class c){        return applicationContext.getBean(c);    }         /**     * 根据bean的class来查找所有的对象(包括子类)     * @param c     * @return     */    public static Map getBeansByClass(Class c){        return applicationContext.getBeansOfType(c);    }}

 

 

非WEB项目

1 ApplicationContext ac = new FileSystemXmlApplicationContext("applicationContext.xml")

可选的操作方法有:

1234567891011 一:String[]   path={"WebRoot/WEB-INF/applicationContext.xml","WebRoot/WEB-INF/applicationContext_task.xml"};ApplicationContext context = new FileSystemXmlApplicationContext(path); 二:String path="WebRoot/WEB-INF/applicationContext*.xml";ApplicationContext context = new FileSystemXmlApplicationContext(path); 三:ApplicationContext ctx = new FileSystemXmlApplicationContext("classpath:地址");没有classpath的话就是从当前的工作目录

 

 

 

另外关于对于接口ApplicationContextAware的理解,可以参考转载的另一篇笔记,深入浅出写的不错:

org.springframework.context.ApplicationContextAware使用理解

转自:http://www.cnblogs.com/yangzhilong/p/3949332.html