java文件读取web-inf下的spring的xml配置文件

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最近在学习spring,就写了一个小程序,来验证spring的自动加载类的功能,主要测试下通过spring来自获取POJO类的实例,闲话少说,上代码:

先写一个POJO类 :

package com.jeecms.common.util;public class Person {        private String name;        private int age;        public String getName() {            return name;        }        public void setName(String name) {            this.name = name;        }        public int getAge() {            return age;        }        public void setAge(int age) {            this.age = age;        }        public void test(){            System.out.println("name:"+getName()+" age:"+getAge());        }    }

然后在写一个bean.xml :

<?xml version="1.0" encoding="UTF-8"?><beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"    xmlns="http://www.springframework.org/schema/beans"    xsi:schemaLocation="http://www.springframework.org/schema/beans    http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">    <bean id="person" class="com.jeecms.common.util.Person">        <property name="name" value="xingoo"/>        <property name="age" value="12"/>    </bean></beans>

最后在写一个测试类:

package com.jeecms.common.util;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;/** * @author Tom */public class Test {    /**     * @param args     */    public static void main(String[] args) {        ApplicationContext app = new ClassPathXmlApplicationContext("bean.xml");        Person p = app.getBean("person",Person.class);//创建bean的引用对象        p.test();    }}

这样基本完成了一个简单的装载注入,不过在使用ClassPathXmlApplicationContext时候发现, ClassPathXmlApplicationContext只能获取编译路径下的src,即你的.class文件目录下,不能获取其他路径的xml文件,不过我们可以使用FileSystemXmlApplicationContext,通过绝对的路径来获取XML文件,

ApplicationContext app = new FileSystemXmlApplicationContext("/WebContent/WEB-INF/config/bean.xml");

也或者通过配置 contextConfigLocation 来初始化所有相关的spring

<context-param>     <!-- Context Configuration locations for Spring XML files -->     <param-name>contextConfigLocation</param-name>      <param-value>         ./WEB-INF/applicationContext.xml     </param-value> </context-param>

然后就可以通过实现ApplicationContextAware 接口,可获取ApplicationContext 实例

/** * 以静态变量保存Spring ApplicationContext,可在任意代码中取出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.     */    @SuppressWarnings("unchecked")    public static <T> T getBean(Class<T> clazz) {        checkApplicationContext();        return (T) applicationContext.getBeansOfType(clazz);    }    private static void checkApplicationContext() {        if (applicationContext == null)            throw new IllegalStateException("applicaitonContext未注入,请在applicationContext.xml中定义SpringContextUtil");    }}
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