JavaWeb--自定义标签3--带标签体的自定义标签
3）中
package tagTest;
import javax.servlet.jsp.JspContext;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.BodyContent;
import javax.servlet.jsp.tagext.JspFragment;
import javax.servlet.jsp.tagext.SimpleTagSupport;
import java.io.IOException;
import java.io.StringWriter;
public class TestJspFragment extends SimpleTagSupport {
private String time;
public void setTime(String time) {
this.time = time;
}
@Override
public void doTag() throws JspException, IOException {
//super.doTag();
JspFragment bodyContent = getJspBody();
StringWriter stringWriter = new StringWriter();
bodyContent.invoke(stringWriter);
String context = stringWriter.toString().toUpperCase();
int count = Integer.parseInt(time);
for(int i = 0; i < count; ++i) {
getJspContext().getOut().print(i + 1 + ": " + context + "<br>");
}
}
}
<tag>
<name>printWrite</name>
<tag-class>tagTest.TestJspFragment</tag-class>
<body-content>scriptless</body-content>
<attribute>
<name>time</name>
<required>true</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
</tag>
<skye:printWrite time="10">helloWorld</skye:printWrite>
1.ForEachTag.java 类
package tagTest;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.SimpleTagSupport;
import java.io.IOException;
import java.util.Collection;
public class FotEachTag extends SimpleTagSupport {
private Collection<?> collection;
private String var;
public Collection<?> getCollection() {
return collection;
}
public void setCollection(Collection<?> collection) {
this.collection = collection;
}
public String getVar() {
return var;
}
public void setVar(String var) {
this.var = var;
}
@Override
public void doTag() throws JspException, IOException {
if(collection != null){
for(Object obj : collection){
getJspContext().setAttribute(var, obj);
getJspBody().invoke(null);
}
}
}
}
2.tld文件中
<tag>
<name>testForEach</name>
<tag-class>tagTest.FotEachTag</tag-class>
<body-content>scriptless</body-content>
<attribute>
<name>collection</name>
<required>true</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>var</name>
<required>true</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
</tag>
3.servlet.jsp
<%@ page import="tagTest.Customer" %>
<%@ page import="java.util.ArrayList" %>
<%@ page import="java.util.List" %><%--
Created by IntelliJ IDEA.
User: Skye
Date: 2017/12/13
Time: 14:38
To change this template use File | Settings | File Templates.
--%>
<%@ taglib prefix="sky" uri="http://skye/jsp/jstl/core"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<%
List<Customer> customers = new ArrayList<Customer>();
customers.add(new Customer(1, "AA", 23));
customers.add(new Customer(2, "AB", 22));
customers.add(new Customer(3, "AC", 21));
customers.add(new Customer(4, "AD", 20));
customers.add(new Customer(5, "AE", 28));
customers.add(new Customer(6, "AF", 26));
customers.add(new Customer(8, "sa", 89));
request.setAttribute("customers", customers);
%>
<sky:testForEach collection="${requestScope.customers}" var="cust">${cust.id} -- ${cust.name}<br></sky:testForEach>
</body>
</html>
