1. 创建自己的bean文件：beans.xml
java" id="highlighter_168366">
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<?xml version="1.0" encoding="UTF-8"?><busi-beans> <beans> <bean id="SysHelloImpl" type="com.cxm.test.SysHello"> <desc>test</desc> <impl-class>com.cxm.test.SysHelloImpl</impl-class> </bean> </beans> </busi-beans> |
2. 提供解析xml类：XmlUtils
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/** * */package com.cxm.xmlutil;import java.io.InputStream;import java.util.Iterator;import java.util.Map;import org.jdom.Attribute;import org.jdom.Document;import org.jdom.Element;import org.jdom.input.SAXBuilder;import org.jdom.xpath.XPath;import com.cxm.beaninfo.BeanInfo;/** * @author admin * */public class XmlUtils{ public static void parseXmlDef(InputStream in, Map<String,BeanInfo> beanDefMap, StringBuffer sb) throws Exception { SAXBuilder reader = new SAXBuilder(false); Document doc = null; try { doc = reader.build(in); Iterator beanIt = XPath.selectNodes(doc, "/busi-beans/beans/bean") .iterator(); Element e; BeanInfo beanDef; while (beanIt.hasNext()) { beanDef = new BeanInfo(); e = (Element) beanIt.next(); Attribute attrId = e.getAttribute("id"); Attribute attrType = e.getAttribute("type"); Attribute singleType = e.getAttribute("single"); boolean isSingle = true; if(null != singleType&&"1".equals(singleType.getValue())){ isSingle= false; } beanDef.setSingle(isSingle); beanDef.setBeanId(attrId.getValue()); beanDef.setType(attrType.getValue()); beanDef.setBeanDesc(getText(e, "desc")); beanDef.setImplClassName(getText(e, "impl-class")); //处理初始化参数 beanDefMap.put(attrId.getValue(), beanDef); } } catch (Exception e) { e.printStackTrace(); } } /** * 根据指定的element, xPath获取XML文档内容 * * @param p_element * @param p_xPath * @return * @throws Exception */ public static String getText(Element p_element, String p_xPath) throws Exception { String text = null; Element e=(Element)XPath.selectSingleNode(p_element,p_xPath); if (e != null) { text = e.getText(); } else { } return text; }} |
3.定义bean IO
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/** * */package com.cxm.beaninfo;/** * @author admin * */public class BeanInfo{ private String beanId; private String type; private String beanDesc; public String getBeanDesc() { return beanDesc; } public void setBeanDesc(String beanDesc) { this.beanDesc = beanDesc; } public String getType() { return type; } public void setType(String type) { this.type = type; } private String implClassName; public String getBeanId() { return beanId; } public void setBeanId(String beanId) { this.beanId = beanId; } public String getImplClassName() { return implClassName; } public void setImplClassName(String implClassName) { this.implClassName = implClassName; } public boolean isSingle() { return isSingle; } public void setSingle(boolean isSingle) { this.isSingle = isSingle; } private boolean isSingle = true; } |
4.bean的创建类：BeanUtil
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/** * */package com.cxm.bean;/** * @author admin * */public class BeanUtil{ private static XmlBeanFactory factory = new XmlBeanFactory(); /** * 获取定义好的Bean对象 * @param p_beanId * @return * @throws Exception */ public static Object createBean(String p_beanId) throws Exception { return factory.createBean(p_beanId); }} /** * */package com.cxm.bean;import java.io.FileNotFoundException;import java.io.InputStream;import java.lang.reflect.Constructor;import java.util.HashMap;import java.util.Map;import com.cxm.beaninfo.BeanInfo;import com.cxm.exception.NoSuchBeanDefinitionException;import com.cxm.xmlutil.XmlUtils;/** * @author admin * */public class XmlBeanFactory{ private static String BEAN_XML = "/beans.xml"; private static Map<String,BeanInfo> beanDefMap = new HashMap<String,BeanInfo>(); private static Map<String,Object> instanceMap = new HashMap<String,Object>(); static { InputStream in = XmlBeanFactory.class.getResourceAsStream(BEAN_XML); if(in ==null){ try{ throw new FileNotFoundException(); }catch (FileNotFoundException e){ e.printStackTrace(); } } StringBuffer sb = new StringBuffer(); try { XmlUtils.parseXmlDef(in, beanDefMap, sb); } catch (Exception e) { throw new RuntimeException(); } } public Object createBean(String beanId) throws Exception{ if(beanId==null || beanId.trim()==""){ throw new Exception("BeanId can not NULL or '' "); } BeanInfo beanInfo = beanDefMap.get(beanId); if(null ==beanInfo ){ throw new NoSuchBeanDefinitionException(" beanid is not define in xml"); } Object instance; if(beanInfo.isSingle()){ instance =instanceMap.get(beanId); if(null != instance){ return instance; } } String implClass = beanInfo.getImplClassName(); Constructor<?> constructor = Class.forName(implClass.trim()).getConstructor(); instance = constructor.newInstance(); if(beanInfo.isSingle()){ instanceMap.put(beanId, instance); } return instance; }} |
5. 测试：
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/** * */package com.cxm.test;/** * @author admin * */public interface SysHello{ void sysHello();} /** * */package com.cxm.test;/** * @author admin * */public class SysHelloImpl implements SysHello{ @Override public void sysHello() { System.out.println("hello world!"); } } /** * */package com.cxm.test;import com.cxm.bean.BeanUtil;/** * @author admin * */public class Test{ /** * @param args * @throws Exception */ public static void main(String[] args) throws Exception { SysHello s = (SysHello)BeanUtil.createBean("SysHelloImpl"); s.sysHello(); } } |
以上这篇java实现Spring在XML配置java类的方法就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持服务器之家。
