IOC XML配置例子

作者:older 日期:2008-05-07 19:05:56

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上一篇日记中介绍了直接使用IOC容器的例子，但是如果觉得那样的方式不是很便利，那么下面将介绍基于XML配置型的例子．在该IOC容器中，定义了POJO的描述元素，如构造，属性等，还定义了IOC环境下的IOC 值对象，只不可以使用XML的方式来描述它们．下面给出一个简单的例子说明它们的使用

在上篇代码基础之上，添加一个新的工厂类（factory bean)，产生POJO实例.

/*
* Copyright (c) jmin Organization. All rights reserved.
 */
package org.jmin.j2ee.ioc.test;
 
/**
 * A object factory to create instances for man class
 * @author Chris Liao
 */
public class ManFactory {
 
  /**
   * Factory method to create a man
   */
  public Man create(String name,int sex){
  	return new Man(name,sex);
  }
}

好了，我们给出这个应用的XML(POJO.xml)

<?xml version="1.0"?>
<service id="POJO">
        <components>
 
                <component id="man1" type="bean">
                        <class>org.jmin.j2ee.ioc.test.Man</class>
                        <singleton>false</singleton>
                        <destroy-method>destroy</destroy-method>
                        <constructor>
                                <constructor-arg value="Chris"/>
                                <constructor-arg value="28"/>
                        </constructor>
                        <property name="age" value="28"/>
                        <invocation>
                                <method-name>sayHello</method-name>
                                <method-param-values>
                                        <method-param-value value="China"/>
                                </method-param-values>
                        </invocation>
                        <interception>
                                <method-name>sayHello</method-name>
                                <method-param-types>
                                        <method-param-type>java.lang.String</method-param-type>
                                </method-param-types>
                                <interceptor class="org.jmin.j2ee.ioc.test.ManInterceptor"/>
                        </interception>
                </component>
 
                <component id="man2" type="bean">
                        <class>org.jmin.j2ee.ioc.test.Man</class>
                        <factory-method>create</factory-method>
                        <singleton>false</singleton>
                        <constructor>
                                <constructor-arg value="Chris"/>
                                <constructor-arg value="28"/>
                        </constructor>
                        <property name="age" value="28"/>
                        <invocation>
                                <method-name>sayHello</method-name>
                                <method-param-values>
                                        <method-param-value value="China"/>
                                </method-param-values>
                        </invocation>
                </component>
 
                <component id="man3" type="bean">
                		<class>org.jmin.j2ee.ioc.test.Man</class>
                        <factory-bean>factory</factory-bean>
                        <factory-method>create</factory-method>
                        <singleton>false</singleton>
                        <constructor>
                                <constructor-arg value="Chris"/>
                                <constructor-arg value="28"/>
                        </constructor>
                        <property name="age" value="28"/>
                        <invocation>
                                <method-name>sayHello</method-name>
                                <method-param-values>
                                        <method-param-value value="China"/>
                                </method-param-values>
                        </invocation>
                </component>
 
                <component id="factory" type="bean">
                        <class>org.jmin.j2ee.ioc.test.ManFactory</class>
                </component>
        </components>
</service>

好了，接下来只用如何通过Context使用这个XML文件了，在Framework中，定义了三种context
ClassPathAppContext, FilePathAppContext , URLAppContext.　在目前例子中使用最后者，那是因为我们已经假定上面的POJO.xml文件是和这些类定义在一起．下面代码将获取三个POJO实例．

 /*
* Copyright (c) jmin Organization. All rights reserved.
 */
package org.jmin.j2ee.ioc.test;
 
import java.net.URL;
 
import org.jmin.j2ee.ioc.context.URLAppContext;
 
/**
 * XML IOC tester
 *
 * @author Chris Liao
 */
 
public class ManXMLIocTest {
 
  /**
   * main method
   */
  public static void main(String args[]) throws Exception {
 
    /**
     * Get resource URL
     */
    URL fileURL = (ManXMLIocTest.class).getResource("POJO.xml");
 
    /**
     * Create a IOC URL context
     */
    URLAppContext context = new URLAppContext(fileURL);
 
    /**
     * print a ioc bean with ID: man1
     */
    System.out.println("bean1: " + context.getBean("man1"));
 
    /**
     * print a ioc bean with ID: man2
     */
    System.out.println("bean2: " + context.getBean("man2"));
 
    /**
     * print a ioc bean with ID: man3
     */
    System.out.println("bean3: " + context.getBean("man3"));
  }
}

最后编译运行它们：

before

Hello,China

returning: null

fianlly: null

bean1: org.jmin.j2ee.ioc.test.Man@9f671b

Hello,China

bean2: org.jmin.j2ee.ioc.test.Man@12a3793

Hello,China

bean3: org.jmin.j2ee.ioc.test.Man@a6d51e

destroy

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