JSP自定义标签(select)
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JS自定义标签实现select功能JSP自定义标签开发步骤:1、编写处理JAVA类(继承javax.servlet.jsp.tagext.SimpleTagSuppot);
2、建立一个*.tld文件(每一个tld对应一个标签库);
3、在JSP中使用标签
java处理类:
package tag1;import java.io.IOException;import java.io.Writer;import java.util.ArrayList;import java.util.Date;import java.util.List;import javax.servlet.http.HttpServletRequest;import javax.servlet.jsp.JspException;import javax.servlet.jsp.tagext.SimpleTagSupport;public class TagDeal extends SimpleTagSupport { /** * */ private Integer value; private boolean defaltValue ; public void doTag()throws JspException,IOException{ List<Student> stuList = new ArrayList<Student>(); stuList.add(new Student(1, "小明")); stuList.add(new Student(2, "小话")); stuList.add(new Student(3, "小红")); Writer out = getJspContext().getOut(); value = 3 ; StringBuffer sb = new StringBuffer() ; sb.append("<select name='name'>"); if(defaltValue){ sb.append("<option value=''>--请选择--</option>"); } for (Student student : stuList) { if(value==student.getNum()){ sb.append("<option value='"+student.getNum()+"' selected='selected'>"); }else{ sb.append("<option value='"+student.getNum()+"'>"); } sb.append(student.getName()+"</option>"); } out.write(sb.toString()); } class Student{ Integer num ; String name ; public Student(Integer num, String name) { super(); this.num = num; this.name = name; } public Integer getNum() { return num; } public void setNum(Integer num) { this.num = num; } public String getName() { return name; } public void setName(String name) { this.name = name; } } public Integer getValue() { return value; } public void setValue(Integer value) { this.value = value; } public boolean isDefaltValue() { return defaltValue; } public void setDefaltValue(boolean defaltValue) { this.defaltValue = defaltValue; } }.tld文件<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"> <tlib-version>1.0</tlib-version> <short-name>SimpleTagLibrary</short-name> <uri>/SimpleTagLibrary</uri> <tag><description>Outputs Hello, World</description> <name>selects</name><tag-class>tag1.TagDeal</tag-class><body-content>empty</body-content><attribute><name>defaltValue</name><required>true</required><fragment>true</fragment></attribute><attribute><name>value</name><required>true</required><fragment>true</fragment></attribute> </tag></taglib>
index.jsp文件<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><%@ taglib uri="/SimpleTagLibrary" prefix="mytag"%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html> <head> <base href="<%=basePath%>"> <title>Simple Tag - HelloWorld</title><meta http-equiv="pragma" content="no-cache"> </head> <body> <mytag:selects value="1" defaltValue="true"/> </body></html>
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