Spring MVC中一般类使用service

在Spring MVC中，Controller中使用service只需使用注解@Resource就行，但是一般类（即不使用@Controller注解的类）要用到service时，可用如下方法：

1、SpringContextUtil

package com.test.utils;

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

    // 下面的这个方法上加了@Override注解，原因是继承ApplicationContextAware接口是必须实现的方法
    @Override
    public void setApplicationContext(ApplicationContext applicationContext)
            throws BeansException {
        SpringContextUtil.applicationContext = applicationContext;
    }

    public static ApplicationContext getApplicationContext() {
        return applicationContext;
    }

    public static Object getBean(String name) throws BeansException {
        return applicationContext.getBean(name);
    }

    public static Object getBean(String name, Class requiredType)
            throws BeansException {
        return applicationContext.getBean(name, requiredType);
    }

    public static boolean containsBean(String name) {
        return applicationContext.containsBean(name);
    }

    public static boolean isSingleton(String name) throws NoSuchBeanDefinitionException {
        return applicationContext.isSingleton(name);
    }

    public static Class getType(String name)    throws NoSuchBeanDefinitionException {
        return applicationContext.getType(name);
    }

    public static String[] getAliases(String name) throws NoSuchBeanDefinitionException {
        return applicationContext.getAliases(name);
    }
}

2、Spring的配置文件application.xml中进行如下配置

<bean id="SpringContextUtil" class="com.test.utils.SpringContextUtil"  scope="singleton"/>

3、使用

static SysUserService userService = (SysUserService) SpringContextUtil.getBean("userService");
List<SysUser> list = userService.getAll();