Spring獲取bean的工具類

package com.tech.jin.util;

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

/**
 * 以靜態變量保存Spring ApplicationContext, 可在任何代碼任何地方任何時候中取出ApplicaitonContext.
 * 
 */
public class SpringUtil implements ApplicationContextAware {
    private static ApplicationContext applicationContext;

    /**
     * 實現ApplicationContextAware接口的context注入函數, 將其存入靜態變量.
     */
    public void setApplicationContext(ApplicationContext applicationContext) {
        SpringUtil.applicationContext = applicationContext; // NOSONAR
    }

    /**
     * 取得存儲在靜態變量中的ApplicationContext.
     */
    public static ApplicationContext getApplicationContext() {
        checkApplicationContext();
        return applicationContext;
    }

    /**
     * 從靜態變量ApplicationContext中取得Bean, 自動轉型為所賦值對象的類型.
     */
    @SuppressWarnings("unchecked")
    public static <T> T getBean(String name) {
        checkApplicationContext();
        return (T) applicationContext.getBean(name);
    }

    /**
     * 從靜態變量ApplicationContext中取得Bean, 自動轉型為所賦值對象的類型.
     */
    @SuppressWarnings("unchecked")
    public static <T> T getBean(Class<T> clazz) {
        checkApplicationContext();
        return (T) applicationContext.getBeansOfType(clazz);
    }

    /**
     * 清除applicationContext靜態變量.
     */
    public static void cleanApplicationContext() {
        applicationContext = null;
    }

    private static void checkApplicationContext() {
        if (applicationContext == null) {
            throw new IllegalStateException(
                    "applicaitonContext未注入,請在applicationContext.xml中定義本SpringUtil--------<bean class='xxxx.SpringUtil' />");
        }
    }
}

 

另外，還需要在applicationContext.xml中定義SpringUtil--------<bean class='xxxx.SpringUtil' />