自定义JSP标签
Posted
tags:
篇首语：本文由小常识网(cha138.com)小编为大家整理，主要介绍了自定义JSP标签相关的知识，希望对你有一定的参考价值。
tld文件:h2y-tags.tld
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE 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>1.1</jsp-version> <short-name>h2y-tags</short-name> <uri>/h2y-tags</uri> <!--input tag--> <tag> <name>input</name> <tag-class>com.xgh.edusite.tag.InputTag</tag-class> <body-content>empty</body-content> <attribute> <name>id</name> <required>false</required> <rtexprvalue>true</rtexprvalue> </attribute> <attribute> <name>type</name> <required>true</required> <rtexprvalue>true</rtexprvalue> </attribute> <attribute> <name>name</name> <required>true</required> <rtexprvalue>true</rtexprvalue> </attribute> <attribute> <name>value</name> <required>false</required> <rtexprvalue>true</rtexprvalue> </attribute> <attribute> <name>css</name> <required>false</required> <rtexprvalue>true</rtexprvalue> </attribute> <attribute> <name>style</name> <required>false</required> <rtexprvalue>true</rtexprvalue> </attribute> <attribute> <name>title</name> <required>false</required> <rtexprvalue>true</rtexprvalue> </attribute> <attribute> <name>dictcode</name> <required>false</required> <rtexprvalue>true</rtexprvalue> </attribute> <attribute> <name>onclick</name> <required>false</required> <rtexprvalue>true</rtexprvalue> </attribute> <attribute> <name>initoption</name> <required>false</required> <rtexprvalue>true</rtexprvalue> </attribute> <attribute> <name>readonly</name> <required>false</required> <rtexprvalue>true</rtexprvalue> </attribute> <attribute> <name>onchange</name> <required>false</required> <rtexprvalue>true</rtexprvalue> </attribute> <attribute> <name>disabled</name> <required>false</required> <rtexprvalue>true</rtexprvalue> </attribute> </tag> </taglib>
对应的Java类
package com.xgh.edusite.tag; import com.xgh.mng.entity.SysDictDetail; import org.apache.commons.lang.StringUtils; import javax.servlet.jsp.JspException; import javax.servlet.jsp.tagext.Tag; import javax.servlet.jsp.tagext.TagSupport; import java.util.ArrayList; import java.util.List; import java.util.Map; /** * 自定义标签（select、checkbox、radio） */ public class InputTag extends TagSupport { /** * */ private static final long serialVersionUID = 1L; private String id;//元素id private String name;//元素名称 private String type;//编辑类型 private String dictcode;//字典编码 private String title;//标题信息 private String value;//元素值 private String css;//元素class属性 private String style;//元素style样式 private Object initoption;//select 初始化选项value,text:value,text private String readonly;//只读属性 private String onclick;//单击事件 private String onchange;//事件 private String disabled;//禁用 private static String inputRadioF = "<input type=\"radio\" id=\"%s\" name=\"%s\" value=\"%s\" class=\"%s\" title=\"%s\" style=\"%s\" %s /><label for=\"%s\">%s</label> "; private static String inputCheckboxF = "<input type=\"checkbox\" id=\"%s\" name=\"%s\" value=\"%s\" class=\"%s\" title=\"%s\" style=\"%s\" %s /><label for=\"%s\">%s</label> "; private static String inputSelectF = "<select id=\"%s\" name=\"%s\" class=\"%s\" title=\"%s\" style=\"%s\" %s >"; private static String selectOptionF = "<option value=\"%s\" title=\"%s\" %s>%s</option>"; private void clear() { this.id = null; this.css = null; this.dictcode = null; this.name = null; this.style = null; this.title = null; this.type = null; this.onclick = null; this.initoption = null; this.readonly = null; this.onchange = null; this.disabled = null; } public int doEndTag() throws JspException { clear(); return Tag.EVAL_PAGE; } public int doStartTag() throws JspException { //sysCacheService = (ISysCacheService) IocUtil.getBean("sysCacheService"); String htmlText = null; if ("checkbox".equals(this.getType())) { htmlText = getCheckboxHtml(); } else if ("radio".equals(this.getType())) { htmlText = getRadioHtml(); } else if ("select".equals(this.getType())) { htmlText = getSelectHtml(); } try { pageContext.getOut().write(htmlText); } catch (Exception e) { e.printStackTrace(); throw new JspException("write error!"); } return SKIP_BODY; } /** * 得到checkBox控件html * * @return */ public String getRadioHtml() { StringBuffer html = new StringBuffer(); List<SysDictDetail> sysDictDetails = getListDictDetail(); if (sysDictDetails != null && !sysDictDetails.isEmpty()) { for (SysDictDetail sysDictDetail : sysDictDetails) { html.append(String.format(inputRadioF, this.getId() + "_" + sysDictDetail.getCode(), this.getName(), sysDictDetail.getCode(), this.getCss(), this.getTitle(), this.getStyle(), this.getValue().equals(sysDictDetail.getCode()) ? " checked=\"checked\" " : "" + this.getOnclick() + this.getOnchange() + this.getReadonly() + this.getDisabled(), this.getId() + "_" + sysDictDetail.getCode(), sysDictDetail.getValue() )); } } return html.toString(); } /** * 得到checkBox控件html * * @return */ public String getCheckboxHtml() { StringBuffer html = new StringBuffer(); String[] vals = this.getValue().split(","); List<SysDictDetail> sysDictDetails = getListDictDetail(); if (sysDictDetails != null && !sysDictDetails.isEmpty()) { for (SysDictDetail sysDictDetail : sysDictDetails) { html.append(String.format(inputCheckboxF, this.getId() + "_" + sysDictDetail.getCode(), this.getName(), sysDictDetail.getCode(), this.getCss(), this.getTitle(), this.getStyle(), this.getCheckboxChecked(vals, sysDictDetail.getCode()) + this.getOnclick() + this.getOnchange() + this.getReadonly() + this.getDisabled(), this.getId() + "_" + sysDictDetail.getCode(), sysDictDetail.getValue() )); } } return html.toString(); } /** * 得到select控件html * * @return */ public String getSelectHtml() { StringBuffer html = new StringBuffer(); html.append(String.format(inputSelectF, this.getId(), this.getName(), this.getCss(), this.getTitle(), this.getStyle(), this.getOnclick() + this.getOnchange() + this.getReadonly() + this.getDisabled() )); List<SysDictDetail> sysDictDetails = getListDictDetail(); if (sysDictDetails != null && !sysDictDetails.isEmpty()) { for (SysDictDetail sysDictDetail : sysDictDetails) { html.append(String.format(selectOptionF, sysDictDetail.getCode(), sysDictDetail.getValue(), this.getValue().equals(sysDictDetail.getCode()) ? "selected=\"selected\"" : "", sysDictDetail.getValue() )); } } return html.toString() + "</select>"; } /** * 得到复选框是否选中 * * @param vals * @param value * @return */ private String getCheckboxChecked(String[] vals, String value) { if (vals != null && vals.length > 0) { for (String string : vals) { if (string.equals(value)) { return " checked=\"checked\" "; } } } return ""; } /** * 获取字典列表项，一级初始化的选项 * * @return */ private List<SysDictDetail> getListDictDetail() { List<SysDictDetail> list = new ArrayList<SysDictDetail>(); //添加自定义选项列表到集合中 addOptionsToList(list); if (this.getDictcode() != null && !this.getDictcode().equals("")) { //list.addAll(DictUtil.getDetailListByMainCode(sysCacheService.getLoginunitId(pageContext.getSession().getId()), this.getDictcode())); } return list; } /** * 添加自定义选项列表到集合中 * * @return */ private void addOptionsToList(List<SysDictDetail> list) { //字符串 if (this.getInitoption() instanceof String) { String temp = (String) this.initoption; String[] atemp = temp.split(":"); if (atemp != null) { for (String astr : atemp) { String[] items = astr.split(","); if (items.length == 2) { SysDictDetail sysDictDetail = new SysDictDetail(); sysDictDetail.setCode(items[0]); sysDictDetail.setValue(items[1]); list.add(sysDictDetail); } } } } else if (this.getInitoption() instanceof ArrayList<?>) {//列表 List<Map<String, Object>> initList = (ArrayList<Map<String, Object>>) this.initoption; for (Map<String, Object> obj : initList) { SysDictDetail sysDictDetail = new SysDictDetail(); sysDictDetail.setCode(obj.get("value").toString()); sysDictDetail.setValue(obj.get("text").toString()); list.add(sysDictDetail); } } } public String processOnClick() { return " onclick=\"" + onclick + "\" "; } public String processOnChange() { return css; } public String processReadonly() { return css; } public String processDisabled() { return css; } public String getId() { if (id == null) { return ""; } return id; } public void setId(String id) { this.id = id; } public String getName() { if (name == null) { return ""; } return name; } public void setName(String name) { this.name = name; } public String getType() { if (type == null) { return ""; } return type; } public void setType(String type) { this.type = type; } public String getDictcode() { if (dictcode == null) { return ""; } return dictcode; } public void setDictcode(String dictcode) { this.dictcode = dictcode; } public String getTitle() { if (title == null) { return ""; } return title; } public void setTitle(String title) { this.title = title; } public String getValue() { if (value == null) { return ""; } return value; } public void setValue(String value) { this.value = value; } public String getCss() { if (css == null) { return ""; } return css; } public void setCss(String css) { this.css = css; } public String getStyle() { if (style == null) { return ""; } return style; } public void setStyle(String style) { this.style = style; } public String getOnclick() { if (StringUtils.isNotBlank(onclick)) { return " onclick=\"" + onclick + "\" "; } return ""; } public void setOnclick(String onclick) { this.onclick = onclick; } public Object getInitoption() { return initoption; } public void setInitoption(Object initoption) { this.initoption = initoption; } public String getReadonly() { if (StringUtils.isNotBlank(readonly) && readonly.equals("readonly")) { return " readonly=\"readonly\" "; } return ""; } public void setReadonly(String readonly) { this.readonly = readonly; } public String getOnchange() { if (StringUtils.isNotBlank(onchange)) { return " onchange=\"" + onchange + "\" "; } return ""; } public void setOnchange(String onchange) { this.onchange = onchange; } public String getDisabled() { if (StringUtils.isNotBlank(disabled) && disabled.equals("disabled")) { return " disabled=\"disabled\" "; } return ""; } public void setDisabled(String disabled) { this.disabled = disabled; } }
在JSP中引入
<%@ taglib uri="/h2y-tags" prefix="h2y" %>以上是关于自定义JSP标签的主要内容，如果未能解决你的问题，请参考以下文章