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code4craftcode4craft
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xml reader
1 parent 1e10421 commit 5bb19ae

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Lines changed: 170 additions & 24 deletions

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‎changelog.md‎

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@@ -15,5 +15,8 @@ tiny-IoC
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1. 抽象beanfactory
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2. 将bean初始化放入beanfactory
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## 2.step3-为bean注入属性
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*step-3-inject-bean-with-property*
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## 3.step3-为bean注入属性
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*step-3-inject-bean-with-property*
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## 4.step4-读取xml配置来初始化bean
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*step-4-config-beanfactory-with-xml*

‎src/main/java/us/codecraft/tinyioc/AbstractBeanDefinitionReader.java‎

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package us.codecraft.tinyioc;
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import us.codecraft.tinyioc.io.ResourceLoader;
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import java.util.HashMap;
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import java.util.Map;
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/**
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* 从配置中读取BeanDefinitionReader
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*
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* @author yihua.huang@dianping.com
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*/
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public abstract class AbstractBeanDefinitionReader implements BeanDefinitionReader {
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private Map<String,BeanDefinition> registry;
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private ResourceLoader resourceLoader;
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protected AbstractBeanDefinitionReader(ResourceLoader resourceLoader) {
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this.registry = new HashMap<String, BeanDefinition>();
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this.resourceLoader = resourceLoader;
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}
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public Map<String, BeanDefinition> getRegistry() {
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return registry;
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}
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public ResourceLoader getResourceLoader() {
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return resourceLoader;
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}
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}

‎src/main/java/us/codecraft/tinyioc/BeanDefinition.java‎

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@@ -2,6 +2,7 @@
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/**
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* bean的内容及元数据，保存在BeanFactory中，包装bean的实体
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*
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* @author yihua.huang@dianping.com
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*/
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public class BeanDefinition {
@@ -12,7 +13,7 @@ public class BeanDefinition {
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private String beanClassName;
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private PropertyValues propertyValues;
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private PropertyValues propertyValues = new PropertyValues();
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public BeanDefinition() {
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}
@@ -46,11 +47,11 @@ public Object getBean() {
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return bean;
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}
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public PropertyValues getPropertyValues() {
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return propertyValues;
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}
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public PropertyValues getPropertyValues() {
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return propertyValues;
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}
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public void setPropertyValues(PropertyValues propertyValues) {
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this.propertyValues = propertyValues;
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}
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public void setPropertyValues(PropertyValues propertyValues) {
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this.propertyValues = propertyValues;
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}
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}

‎src/main/java/us/codecraft/tinyioc/BeanDefinitionReader.java‎

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package us.codecraft.tinyioc;
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/**
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* 从配置中读取BeanDefinitionReader
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* @author yihua.huang@dianping.com
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*/
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public interface BeanDefinitionReader {
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void loadBeanDefinitions(String location) throws Exception;
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}

‎src/main/java/us/codecraft/tinyioc/xml/XmlBeanDefinitionReader.java‎

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package us.codecraft.tinyioc.xml;
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import org.w3c.dom.Document;
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import org.w3c.dom.Element;
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import org.w3c.dom.Node;
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import org.w3c.dom.NodeList;
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import us.codecraft.tinyioc.AbstractBeanDefinitionReader;
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import us.codecraft.tinyioc.BeanDefinition;
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import us.codecraft.tinyioc.PropertyValue;
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import us.codecraft.tinyioc.io.ResourceLoader;
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import javax.xml.parsers.DocumentBuilder;
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import javax.xml.parsers.DocumentBuilderFactory;
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import java.io.InputStream;
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/**
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* @author yihua.huang@dianping.com
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*/
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public class XmlBeanDefinitionReader extends AbstractBeanDefinitionReader {
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public XmlBeanDefinitionReader(ResourceLoader resourceLoader) {
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super(resourceLoader);
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}
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@Override
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public void loadBeanDefinitions(String location) throws Exception {
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InputStream inputStream = getResourceLoader().getResource(location).getInputStream();
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doLoadBeanDefinitions(inputStream);
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}
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protected void doLoadBeanDefinitions(InputStream inputStream) throws Exception {
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DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
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DocumentBuilder docBuilder = factory.newDocumentBuilder();
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Document doc = docBuilder.parse(inputStream);
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// 解析bean
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registerBeanDefinitions(doc);
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inputStream.close();
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}
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public void registerBeanDefinitions(Document doc) {
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Element root = doc.getDocumentElement();
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parseBeanDefinitions(root);
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}
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protected void parseBeanDefinitions(Element root) {
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NodeList nl = root.getChildNodes();
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for (int i = 0; i < nl.getLength(); i++) {
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Node node = nl.item(i);
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if (node instanceof Element) {
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Element ele = (Element) node;
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processBeanDefinition(ele);
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}
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}
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}
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protected void processBeanDefinition(Element ele) {
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String name = ele.getAttribute("name");
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String className = ele.getAttribute("class");
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BeanDefinition beanDefinition = new BeanDefinition();
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processProperty(ele,beanDefinition);
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beanDefinition.setBeanClassName(className);
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getRegistry().put(name, beanDefinition);
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}
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private void processProperty(Element ele,BeanDefinition beanDefinition) {
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NodeList propertyNode = ele.getElementsByTagName("property");
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for (int i = 0; i < propertyNode.getLength(); i++) {
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Node node = propertyNode.item(i);
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if (node instanceof Element) {
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Element propertyEle = (Element) node;
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String name = propertyEle.getAttribute("name");
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String value = propertyEle.getAttribute("value");
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beanDefinition.getPropertyValues().addPropertyValue(new PropertyValue(name,value));
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}
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}
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}
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}

‎src/test/java/us/codecraft/tinyioc/BeanFactoryTest.java‎

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@@ -3,6 +3,10 @@
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import org.junit.Test;
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import us.codecraft.tinyioc.factory.AutowireCapableBeanFactory;
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import us.codecraft.tinyioc.factory.BeanFactory;
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import us.codecraft.tinyioc.io.ResourceLoader;
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import us.codecraft.tinyioc.xml.XmlBeanDefinitionReader;
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import java.util.Map;
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/**
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* @author yihua.huang@dianping.com
@@ -11,22 +15,17 @@ public class BeanFactoryTest {
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@Test
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public void test() throws Exception {
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// 1.初始化beanfactory
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BeanFactory beanFactory = new AutowireCapableBeanFactory();
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// 2.bean定义
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BeanDefinition beanDefinition = new BeanDefinition();
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beanDefinition.setBeanClassName("us.codecraft.tinyioc.HelloWorldService");
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// 1.读取配置
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XmlBeanDefinitionReader xmlBeanDefinitionReader = new XmlBeanDefinitionReader(new ResourceLoader());
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xmlBeanDefinitionReader.loadBeanDefinitions("tinyioc.xml");
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// 3.设置属性
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PropertyValues propertyValues = new PropertyValues();
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propertyValues.addPropertyValue(new PropertyValue("text", "Hello World!"));
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beanDefinition.setPropertyValues(propertyValues);
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// 4.生成bean
27-
beanFactory.registerBeanDefinition("helloWorldService", beanDefinition);
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// 2.初始化BeanFactory并注册bean
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BeanFactory beanFactory = new AutowireCapableBeanFactory();
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for (Map.Entry<String, BeanDefinition> beanDefinitionEntry : xmlBeanDefinitionReader.getRegistry().entrySet()) {
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beanFactory.registerBeanDefinition(beanDefinitionEntry.getKey(), beanDefinitionEntry.getValue());
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}
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// 5.获取bean
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// 3.获取bean
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HelloWorldService helloWorldService = (HelloWorldService) beanFactory.getBean("helloWorldService");
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helloWorldService.helloWorld();
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‎src/test/java/us/codecraft/tinyioc/xml/XmlBeanDefinitionReaderTest.java‎

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package us.codecraft.tinyioc.xml;
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import org.junit.Assert;
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import org.junit.Test;
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import us.codecraft.tinyioc.BeanDefinition;
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import us.codecraft.tinyioc.io.ResourceLoader;
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import java.util.Map;
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/**
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* @author yihua.huang@dianping.com
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*/
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public class XmlBeanDefinitionReaderTest {
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@Test
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public void test() throws Exception {
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XmlBeanDefinitionReader xmlBeanDefinitionReader = new XmlBeanDefinitionReader(new ResourceLoader());
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xmlBeanDefinitionReader.loadBeanDefinitions("tinyioc.xml");
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Map<String, BeanDefinition> registry = xmlBeanDefinitionReader.getRegistry();
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Assert.assertTrue(registry.size() > 0);
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}
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}

‎src/test/resources/tinyioc.xml‎

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@@ -8,6 +8,8 @@
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http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd
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http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd">
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<bean name="helloWorldService" class="us.codecraft.tinyioc.HelloWorldService"></bean>
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<bean name="helloWorldService" class="us.codecraft.tinyioc.HelloWorldService">
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<property name="text" value="Hello World!"></property>
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</bean>
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</beans>

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