关于java自定义标签的写法（下拉列表两级联动）
java代码：
package com.newsicom.common.web.tag;import java.util.Map;import javax.servlet.jsp.JspException;import javax.servlet.jsp.tagext.TagSupport;import com.newsicom.common.constants.Constants;import com.newsicom.common.domain.PdEmployeeInfoV;import com.newsicom.common.domain.PdRegionMaster;import com.newsicom.common.util.Util;import com.newsicom.common.web.global.model.impl.RegionMasterMapImpl;public class CompanySelectTag extends TagSupport {/** * */private static final long serialVersionUID = 1L;private String cssClass;private String style;private String id;private boolean hasSaleFlg;/** * 获取 hasSaleFlg * * @return hasSaleFlg */public boolean isHasSaleFlg() {return hasSaleFlg;}/** * 设置 hasSaleFlg * * @param hasSaleFlg * : hasSaleFlg */public void setHasSaleFlg(boolean hasSaleFlg) {this.hasSaleFlg = hasSaleFlg;}public String getCssClass() {return cssClass;}public void setCssClass(String cssClass) {this.cssClass = cssClass;}public String getStyle() {return style;}public void setStyle(String style) {this.style = style;}public String getId() {return id;}public void setId(String id) {this.id = id;}private String name;/** * @return the name */public String getName() {return name;}/** * @param name * the name to set */public void setName(String name) {this.name = name;}@Overridepublic int doStartTag() throws JspException {try {PdEmployeeInfoV employeeInfoV = (PdEmployeeInfoV) pageContext.getSession().getAttribute(Constants.USER_INFO_HTTP_SESSION);StringBuilder sb = new StringBuilder("");String orgFlg = employeeInfoV.getOrganizationClassify();boolean disabled = false;if (orgFlg.equals("02")) {// 只锁销售if (hasSaleFlg&& (employeeInfoV.getFuncIds().indexOf("1") >= 0 || employeeInfoV.getFuncIds().indexOf("3") >= 0)) {disabled = true;} else if (!hasSaleFlg&& (employeeInfoV.getFuncIds().indexOf("2") >= 0 || employeeInfoV.getFuncIds().indexOf("4") >= 0)) {disabled = true;}}sb.append("<select ");// 设置IDsb.append(id != null ? "id="" + id + "" ": Constants.EMPTY_STRING);// 设置csssb.append(cssClass != null ? "class="" + cssClass + "" ": Constants.EMPTY_STRING);// 设置名字sb.append(name != null ? "name="" + name + "" ": Constants.EMPTY_STRING);// 设置stylesb.append(style != null ? "style="" + style + "" ": Constants.EMPTY_STRING);// 设置是否锁死sb.append(disabled ? " disabled " : Constants.EMPTY_STRING);sb.append(">\n");if (orgFlg.equals("03")) {if ((hasSaleFlg && (employeeInfoV.getFuncIds().indexOf("1") >= 0 || employeeInfoV.getFuncIds().indexOf("3") >= 0))|| (!hasSaleFlg && (employeeInfoV.getFuncIds().indexOf("2") >= 0 || employeeInfoV.getFuncIds().indexOf("4") >= 0))) {Map<Integer, PdRegionMaster> map = RegionMasterMapImpl.getInstance().getCompanyMap(employeeInfoV.getOrganizationId());sb.append("<option value="" ></option>\n");for (Map.Entry<Integer, PdRegionMaster> entry : map.entrySet()) {sb.append("<option value=""+ entry.getValue().getSubCompanyId() + "" >"+ entry.getValue().getSubCompanyName()+ "</option>\n");}}} else if (orgFlg.equals("02")) {if (disabled) {sb.append("<option value=""+ employeeInfoV.getOrganizationId()+ "" >"+ RegionMasterMapImpl.getInstance().getCompany(employeeInfoV.getUpperOrganizationId(),employeeInfoV.getOrganizationId()).getSubCompanyName() + "</option>\n");}}sb.append("</select>");this.pageContext.getOut().write(sb.toString());} catch (Exception e) {e.printStackTrace();}return TagSupport.EVAL_PAGE;}}?tld代码：
<?xml version="1.0" encoding="UTF-8" ?><taglib xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-jsptaglibrary_2_0.xsd"version="2.0"><description>大区选择列表框</description><tlib-version>1.0</tlib-version><short-name>nsctags-common-region-subcompany</short-name><uri>/nsctags-common-region-subcompany</uri><tag><name>RegionSelect</name><tag-class>com.newsicom.common.web.tag.RegionSelectTag</tag-class><body-content>empty</body-content><attribute><name>id</name><required>true</required><rtexprvalue>false</rtexprvalue><type>java.lang.String</type></attribute><attribute><name>name</name><required>true</required><rtexprvalue>false</rtexprvalue><type>java.lang.String</type></attribute><attribute><name>subcompanySelectId</name><required>true</required><rtexprvalue>false</rtexprvalue><type>java.lang.String</type></attribute><attribute><name>cssClass</name><required>false</required><rtexprvalue>false</rtexprvalue><type>java.lang.String</type></attribute><attribute><name>style</name><required>false</required><rtexprvalue>false</rtexprvalue><type>java.lang.String</type></attribute><attribute><name>hasSaleFlg</name><required>true</required><rtexprvalue>false</rtexprvalue><type>java.lang.Boolean</type></attribute></tag><tag><name>CompanySelect</name><tag-class>com.newsicom.common.web.tag.CompanySelectTag</tag-class><body-content>empty</body-content><attribute><name>id</name><required>true</required><rtexprvalue>false</rtexprvalue><type>java.lang.String</type></attribute><attribute><name>hasSaleFlg</name><required>true</required><rtexprvalue>false</rtexprvalue><type>java.lang.Boolean</type></attribute><attribute><name>name</name><required>false</required><rtexprvalue>false</rtexprvalue><type>java.lang.String</type></attribute><attribute><name>cssClass</name><required>false</required><rtexprvalue>false</rtexprvalue><type>java.lang.String</type></attribute><attribute><name>style</name><required>false</required><rtexprvalue>false</rtexprvalue><type>java.lang.String</type></attribute></tag></taglib>
?HTML调用：
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<%@taglib prefix="nsc" uri="/nsctags-common-region-subcompany"%><td class=headerlabel width=94 align=right> 安装大区 </td> <td width=80 align=left> <nsc:RegionSelect hasSaleFlg="false" subcompanySelectId="installSubcompanyId" id="installRegionId" name="installRegionId" style="width: 100px" /> </td> <td class=headerlabel width=92 align=right> 安装分公司 </td> <td class=headerlabel width=110 align=left> <nsc:CompanySelect hasSaleFlg="false" id="installSubcompanyId" name="installSubcompanyId" style="width: 110px"/>?
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