自定义标签

WEB-INF/tlds/app.tld中
定义一个文件。
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYOE taglib PUBLIC "-//Sun Microsystems, Inc.//DTD JSP Tag Library 1.2//EN"
"http://java.sun.com/dtd/web-jsptaglibrary_1_2.dtd">
<taglib>
<tlib-version>1.0</tlib-version>
<jsp-version>1.2</jsp-version>
<short-name>Application Tag Library</short-name>
<description>This tag library contains functionality specific to the PICC CLAIM Application.</description>
<!--下拉框列表-->
<tag>
<name>select</name>
<tag-class>com.ct.framework.tag.SelectTag</tag-class>
<attribute>
<name>codeType</name>
<required>true</required>
<rtexprvalue>true</rtexprvalue>
<description>代码类型</description>
</attribute>
<attribute>
<name>language</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
<description>language</description>
</attribute>
<attribute>
<name>id</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
<description>标签Id</description>
</attribute>
<attribute>
<name>name</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
<description>下拉列表name</description>
</attribute>
<attribute>
<name>cssClass</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
<description>下拉列表样式</description>
</attribute>
<attribute>
<name>style</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
<description>风格</description>
</attribute>
<attribute>
<name>selectedValue</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
<description>已选中的值</description>
</attribute>
<attribute>
<name>multiple</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
<description>是否可以多选</description>
</attribute>
<attribute>
<name>withAll</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
<description>是否显示全部</description>
</attribute>
<attribute>
<name>withBlack</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
<description>是否显示空白</description>
</attribute>
<attribute>
<name>condition</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
<description>父级列表（筛选条件）</description>
</attribute>
<attribute>
<name>onchange</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
<description>onchange事件</description>
</attribute>
</tag>
在com.ct.framework.tag中有SelectTag.java
public class SelectTag extends TagSupport{
private final Log logger = LogFactory.getLog(this.getClass());
private String codeType;
private String language;
private String id;//标签id
private String name;//下拉列表名字
private String cssClass;//下拉列表样式
private String style;//风格
private String selectedValue;//已选中的值
private Boolean multiple;//是否可以多选
private Boolean withAll;//是否显示全部
private Boolean withBlack;//是否显示空白
private String codition;//父级列表（筛选条件）
private String onchange;//onchange事件

public int doStartTag() throws JspException{
if(language == null){
language = "C";
}
HttpSession httpSession = this.pageContext.getSession();
StringBuffer resultBuffer = new StringBuffer();
ConditionVo conditionVo = new ConditionVo();
JspWriter jspWriter = pageContext.getOut();
CodeCodeService codeCodeService =
(CodeCodeService)ServiceFactory.getService("codeCodeService");
List<CodeCode> codeCodeList;
conditionVp.setSearchCondition(condition);
try{
//这步用type查询出类型下的code集合对象
codeCodeList = codeCodeService.listCodeSelect(codeType,conditionVo,httpSession);
}catch(Exception ex){
...
}
//标签的处理
resultBuffer.append("<select ");
if(StringUtiles.isNotEmpty(name)){
resultBuffer.append(" name=\"").append(name).append("\"");
}
//id
if(StringUtils.isNotEmpty(id)){
resultBuffer.append(" id='"").append(id).append("\"");
}
//css样式
if(StringUtils.isEmpty){

}else{
resultBuffer.append(" class=\"").append(cssClass).append("\"");
}
//style
if(StringUtils.isNotEmpty(style)){
resultBuffer.append(" style=\"").append(style).append("\"");
}
//多选
if(multiple!=null&&multiple){
resultBuffer.append(" multiple");
}
//onchange事件
if(StringUtils.isNotEmpty(onchange)){
resultBuffer.append(" onchange=\"").append(onchange).append("\"");
}
resultBuffer.append(">");
//列表项中显示全部
if(withAll!=null&&withAll){
resultBuffer.append("<option value=''>");
resultBuffer.append(请选择);
resultBuffer.append("</option>);
}
for(CodeCode codeCode:codeCodeList){
String codeCodeStr = codeCode.getCodeCode();
String codeCNameStr = codeCode.getCodeCName();
resultBuffer.append("<option");
resultBuffer.append(" value=\"" + codeCodeStr + "\"");
if(selectedValue!=null&&selectedValue.equals(codeCodeStr)){
resultBuffer.append(" selected=\"selected\"");
}
resultBuffer.append(">");
resultBuffer.append(codeCNameStr);
resultBuffer.append("</option>");
}
resultBuffer.append("</select>");
try{
logger.debug("SelectTag标签:" + resultBuffer.toString());
jspWriter.print(resultBuffer.toString());
}catch(Exception ex){
...
}
return EVAL_BODY_INCLUDE;
}
public int doEndTag()throws Exception{
this.codeType="";
this.language="";
this.id="";
this.name="";
this.cssClass="";
this.selectedValue="";
this.multiplie=false;
this.withAll=false;
this.withBlack=false;
this.condition="";
this.onchange="";
return EVAL_PAGE;
}
setter getter方法
}

Spring注入Service实例工厂
public class ServiceFactory{
private static WebApplicationContext context;
private ServiceFactory(){}
public static void initServiceFactory(ServletContext servletContext){
context = WebApplicationContextUtils.getRequiredWebApplicationContext(servletContext);
}
public static Object getService(String serviceName){
return context.getBean(serviceName);
}
}