1. 创建自己的bean文件：beans.xml

<"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

/** * */ 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

/** * */ 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

/** * */ 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：

/** * */ 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查字典教程网。