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JSP自定义标签-第一个简单的例子

2017-06-22 20:47 309 查看

此例子标签的效果



开发步骤

定义实体类

public class Emp {

private String empId;

private String name;

private String phoneNumber;

public Emp() {
}

public String getEmpId() {
return empId;
}

public void setEmpId(String empId) {
this.empId = empId;
}

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

public String getPhoneNumber() {
return phoneNumber;
}

public void setPhoneNumber(String phoneNumber) {
this.phoneNumber = phoneNumber;
}
}


创建标签库描述文件：/WEB-INF/tag/emptag.tdl

<?xml version="1.0" encoding="UTF-8"?>

<taglib version="2.0" 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 web-jsptaglibrary_2_0.xsd">

<tlib-version>1.0</tlib-version>

<jsp-version>2.0</jsp-version>

<short-name>webapp</short-name>

<uri>/webapptaglib</uri>

<tag>

<name>empInfo</name>

<tag-class>com.sdTag.EmpTag</tag-class>

<body-content>empty</body-content>

<attribute>

<name>emp</name>

<required>false</required>

<rtexprvalue>true</rtexprvalue>

</attribute>

</tag>

</taglib>


在web.xml中配置映射

<jsp-config>
<taglib>
<taglib-uri>/webapptaglib</taglib-uri>
<taglib-location>/WEB-INF/tag/emptag.tdl</taglib-location>
</taglib>
</jsp-config>


自定义标签类

package com.sdTag;

import java.io.IOException;

import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.tagext.TagSupport;

import com.Emp;

public class EmpTag extends TagSupport {
/**
*
*/
private static final long serialVersionUID = 1L;
private Emp emp;

public int doStartTag() throws JspException {
JspWriter out = this.pageContext.getOut();
try {
if (emp == null) {

out.println("No data Found...");

return SKIP_BODY;

}
out.println("<table width='500px' border='3' bordercolor='red' align='center'>");

out.println("<tr>");

out.println("<td width='20%'>Emp Id:</td>");

out.println("<td>" + emp.getEmpId() + "</td>");

out.println("</tr>");

out.println("<tr>");

out.println("<td>Name:</td>");

out.println("<td>" + emp.getName() + "</td>");

out.println("</tr>");

out.println("<tr>");

out.println("<td>Phone Number:</td>");

out.println("<td>" + emp.getPhoneNumber() + "</td>");

out.println("</tr>");

out.println("</table>");
} catch (IOException e) {
e.printStackTrace();
}

return SKIP_BODY;
}

@Override

public void release() {

super.release();

this.emp = null;

}

//getter and setters

public Emp getEmp() {

return emp;

}

public void setEmp(Emp emp) {

this.emp = emp;

}

}


最后在JSP中引用自定义标签

<%@page import="com.Emp"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib uri="/webapptaglib" prefix="webapp"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<%

Emp emp = new Emp();

emp.setEmpId("AP001");

emp.setName("Tom");

emp.setPhoneNumber("10086");

pageContext.setAttribute("emp", emp);

%>

<webapp:empInfo emp="${pageScope.emp }" />

</body>
</html>
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标签：  jsp自定义标签
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