ibatis支持多配置文件实现

思路如下:
1、修改SqlMapClientBuilder，增加一个新的方法buildSqlMapClient(String locationPath)
2、分析此locationPath，获取到n个配置文件
3、把这些n个配置文件都以xml的方式读取，然后合并其中的各个节点，得到一个合并后的xml文件
4、以合并后的xml文件初始化SqlMapClient

可以如下初始化

SqlMapClientBuilder.buildSqlMapClient("sqlmap-iw-config.xml,sqlmap-dc.config.xml");
SqlMapClientBuilder.buildSqlMapClient("sqlmap-*-config.xml");

或者使用spring配置

<bean id="configBean"
		class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
		<property name="location">
			<value>classpath:com/liwj/example/ibatis/SqlMapConfigExample.properties</value>
		</property>
	</bean>	
	
	<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
		<property name="driverClassName">
			<value>${driver}</value>
		</property>
		<property name="url">
			<value>${url}</value>
		</property>
		<property name="username">
			<value>${username}</value>
		</property>
		<property name="password">
			<value>${password}</value>
		</property>
	</bean>
	
	<bean id="sqlMapClient" class="org.springframework.orm.ibatis.SqlMapClientFactoryBean">
		<property name="configLocation">
			<value>classpath:conf/ibatis/sqlmap-*-config.xml</value>
<!--
<property name="configLocation">
			<value>classpath:conf/ibatis/sqlmap-iw-config.xml,conf/ibatis/sqlmap-dc-config.xml</value>
-->
		</property>		
<property name="dataSource">
			<ref bean="dataSource"/>
		</property>
	</bean>
	
	<bean id="sqlMapClientTemplate" class="org.springframework.orm.ibatis.SqlMapClientTemplate">
	   <property name="sqlMapClient">
	    <ref bean="sqlMapClient" />
	   </property>
	 </bean>

想法是这样子的，还有没有具体去写，有时间了补充完整……

现在终于补充完毕了，修改com.ibatis.sqlmap.client.SqlMapClientBuilder
增加全局变量

private static final String PROPERTIES="properties";
	private static final String SETTINGS="settings";
	private static final String RESULTOBJECTFACTORY="resultObjectFactory";
	private static final String TYPEALIAS="typeAlias";
	private static final String TYPEALIAS_ALIAS="alias";
	private static final String TYPEHANDLER="typeHandler";
	private static final String TRANSACTIONMANAGER="transactionManager";
	private static final String SQLMAP="sqlMap";
	private static final String SQLMAP_RESOURCE="resource";
	private static final String SQLMAPCONFIG_ROOT="sqlMapConfig";

增加方法如下：

 public static SqlMapClient buildSqlMapClient(String locationPath){
	  ResourceLoader resourceLoader=new PathMatchingResourcePatternResolver();
	  Document d_doc=null;
	  try{
		  Resource[]  a_resource=((ResourcePatternResolver) resourceLoader).getResources(locationPath);
		  SAXReader reader=new SAXReader();
		  for(int i=0;i<a_resource.length;i++){
			  
			  Reader fileReader=new FileReader(a_resource[i].getFile());
			  if(i==0) d_doc=reader.read(fileReader);
			  else{
				  Document r_doc=reader.read(fileReader);
			  	new SqlMapClientBuilder().combinationAll(r_doc, d_doc);
			  	
			  }
		  }
	  }catch(Exception e){
		  e.printStackTrace();
	  }
	  d_doc.addDocType("sqlMapConfig", "-//iBatis.com//DTD SQL Map Config 2.0//EN", "http://www.iBatis.com/dtd/sql-map-config-2.dtd");
	  
	  return new SqlMapClientBuilder().buildSqlMapClient(new ByteArrayInputStream(d_doc.asXML().getBytes()));
  }
  public void combinationAll(Document resource,Document destination){
	  combinationGlobalPropNodelets(resource, destination);
	  combinationSettingsNodelets(resource, destination);
	  combinationSqlMapNodelets(resource, destination);
	  combinationTypeAliasNodelets(resource, destination);
	  
	  combinationResultObjectFactoryNodeltes(resource, destination);
	  combinationTransactionManagerNodeltes(resource, destination);
	  combinationTypeHandlerNodeltes(resource, destination);
	  
	 
  }
  private void combinationSqlMapNodelets(Document resource,Document destination){
	  combination(this.SQLMAP, resource, destination);
  }
  
  private void combinationTypeAliasNodelets(Document resource,Document destination){
	  combination(this.TYPEALIAS, resource, destination);
  }
  
  private void combinationSettingsNodelets(Document resource,Document destination){
	  combination(this.SETTINGS, resource, destination);
  }
  
  private void combinationGlobalPropNodelets(Document resource,Document destination){
	  combination(this.PROPERTIES, resource, destination);
  }
  
  private void combinationTransactionManagerNodeltes(Document resource,Document destination){
	  combination(this.TRANSACTIONMANAGER, resource, destination);
  }
  
  private void combinationResultObjectFactoryNodeltes(Document resource,Document destination){
	  combination(this.RESULTOBJECTFACTORY, resource, destination);
  }
  
  private void combinationTypeHandlerNodeltes(Document resource,Document destination){
	  combination(this.TYPEHANDLER, resource, destination);
  }
  
  private void combination(String nodePath,Document resource,Document destination){
	  /*只允许一个节点*/
	  StringBuffer onePro=new StringBuffer();
	  onePro.append(PROPERTIES).append(",").append(SETTINGS);
	  StringBuffer zeroPro=new StringBuffer();
	  zeroPro.append(TYPEALIAS).append(",").append(",").append(SQLMAP);
	  
	  String nodeXpath="/sqlMapConfig/"+nodePath;
	  List L_R_element=resource.selectNodes(nodeXpath);
	  List L_D_element=destination.selectNodes(nodeXpath);
	  /*源节点，判断目的节点是否有此节点，无则添加，有则比较*/
	  if(L_R_element!=null&&L_R_element.size()>0){
		  /*如目的节点为null，则把源节点全部加入到目的节点中*/
		  if(L_D_element==null||L_D_element.size()==0){
			  for(int i=0;i<L_R_element.size();i++){
				  Element element=(Element)L_R_element.get(i);
				  destination.add(element);
			  }
		  }else{
			  if(onePro.toString().indexOf(nodePath)>=0){
				  /*只有一个节点，则合并两个节点的属性*/
				  Element r_element=(Element)L_R_element.get(0);
				  Element d_element=(Element)L_D_element.get(0);
				  
				  /*比较所有属性*/
				  List r_attribute=r_element.attributes();
				  if(r_attribute!=null&&!r_attribute.isEmpty()){
					  List d_attribute=d_element.attributes();
					  /*如果目的节点没有任何属性，则将原属性全部加入目的节点*/
					  if(d_attribute==null||d_attribute.isEmpty()){
						  d_element.setAttributes(r_attribute);
					  }else{
						  List list_temp=new ArrayList();
						  for(int i=0;i<d_attribute.size();i++){
							  list_temp.add(((Attribute)d_attribute.get(i)).getName());
						  }
						  /*循环源节点的所有属性，如目的节点中没有此属性，则添加*/
						  for(int i=0;i<r_attribute.size();i++){
							  Attribute temp_attr=(Attribute)r_attribute.get(i);
							  if(!list_temp.contains(temp_attr.getName())){
								  d_element.add((Attribute)temp_attr.clone());
								  //d_element.addAttribute(temp_attr.getName(), temp_attr.getValue());
							  }
						  	
						  }
					  }
				  }
			  }else if(zeroPro.toString().indexOf(nodePath)>=0){
				  String comp="";
				  if(nodePath.equals(TYPEALIAS)) comp=TYPEALIAS_ALIAS;
				  else if(nodePath.equals(SQLMAP)) comp=SQLMAP_RESOURCE;
				  List d_temp=new ArrayList();
				  for(int i=0;i<L_D_element.size();i++){
					  Element element=(Element)L_D_element.get(i);
					  d_temp.add(element.attribute(comp).getValue());
				  }
				  /*循环源节点，如果目的节点由此节点，则忽略，否则添加*/
				  Element ele_root=destination.getRootElement();
				  for(int i=0;i<L_R_element.size();i++){
					  Element element=(Element)L_R_element.get(i);
					  if(!d_temp.contains(element.attribute(comp).getValue()))
						  ele_root.add((Element)element.clone());
					  	
				  }
			  }else{
				  
			  }
		  }
	  }

使用了dom4j来操作xml