7. Jsp 自定义标签
2016-07-03 00:00
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全部xml配置：
[code=language-java]<?xml version="1.0" encoding="UTF-8" ?> <taglib xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-jsptaglibrary_2_1.xsd" version="2.1"> <tlib-version>1.0</tlib-version> <short-name>java1234Tag</short-name> <tag> <name>helloWorld</name> <tag-class> com.java1234.tag.HelloWorldTag </tag-class> <body-content>empty</body-content> </tag> <tag> <name>helloWorld2</name> <tag-class> com.java1234.tag.HelloWorldTag2 </tag-class> <body-content>empty</body-content> <attribute> <name>name</name> <required>true</required> <rtexprvalue>true</rtexprvalue> </attribute> </tag> <tag> <name>iterate</name> <tag-class> com.java1234.tag.IterateTag </tag-class> <body-content>JSP</body-content> <attribute> <name>var</name> <required>true</required> <rtexprvalue>true</rtexprvalue> </attribute> <attribute> <name>items</name> <required>true</required> <rtexprvalue>true</rtexprvalue> </attribute> </tag> <tag> <name>iterate2</name> <tag-class> com.java1234.tag.IterateSimpleTag </tag-class> <body-content>scriptless</body-content> <attribute> <name>var</name> <required>true</required> <rtexprvalue>true</rtexprvalue> </attribute> <attribute> <name>items</name> <required>true</required> <rtexprvalue>true</rtexprvalue> </attribute> </tag> </taglib>
[code=language-java]<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%@ taglib prefix="java1234" uri="/WEB-INF/java1234.tld" %> <!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=UTF-8"> <title>Insert title here</title> </head> <body> <java1234:helloWorld/> </body> </html>
[code=language-java]package com.java1234.tag;
import java.io.IOException;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.tagext.TagSupport;
public class HelloWorldTag extends TagSupport{
/**
*
*/
private static final long serialVersionUID = 1L;
@Override
public int doStartTag() throws JspException {
JspWriter out=this.pageContext.getOut();
try {
out.println("自定义标签大爷你好！");
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return TagSupport.SKIP_BODY; // 直接结束标签
}
}[code=language-java]<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%@ taglib prefix="java1234" uri="/WEB-INF/java1234.tld" %> <!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=UTF-8"> <title>Insert title here</title> </head> <body> <java1234:helloWorld2 name="JspServlet屌炸天"/> </body> </html>
[code=language-java]package com.java1234.tag;
import java.io.IOException;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.tagext.TagSupport;
public class HelloWorldTag2 extends TagSupport{
/**
*
*/
private static final long serialVersionUID = 1L;
private String name;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@Override
public int doStartTag() throws JspException {
JspWriter out=this.pageContext.getOut();
try {
out.println(name+"自定义标签大爷你好！");
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return TagSupport.SKIP_BODY; // 直接结束标签
}
}[code=language-java]package com.java1234.tag;
import java.util.Iterator;
import java.util.List;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.TagSupport;
public class IterateTag extends TagSupport{
/**
*
*/
private static final long serialVersionUID = 1L;
private String var;
private String items;
private Iterator iter;
public String getVar() {
return var;
}
public void setVar(String var) {
this.var = var;
}
public String getItems() {
return items;
}
public void setItems(String items) {
this.items = items;
}
public Iterator getIter() {
return iter;
}
public void setIter(Iterator iter) {
this.iter = iter;
}
@Override
public int doStartTag() throws JspException {
Object value=this.pageContext.getAttribute(items);
if(value!=null && value instanceof List){
this.iter=((List)value).iterator();
if(iter.hasNext()){
this.pageContext.setAttribute(var, iter.next());
return TagSupport.EVAL_BODY_INCLUDE; // 执行标签体
}else{
return TagSupport.SKIP_BODY; // 退出标签执行
}
}else{
return TagSupport.SKIP_BODY; // 退出标签执行
}
}
@Override
public int doAfterBody() throws JspException {
if(iter.hasNext()){
this.pageContext.setAttribute(var, iter.next());
return TagSupport.EVAL_BODY_AGAIN; // 再执行一次标签体
}else{
return TagSupport.SKIP_BODY; // 退出标签执行
}
}
}[code=language-java]package com.java1234.tag;
import java.util.Iterator;
import java.util.List;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.TagSupport;
public class IterateTag extends TagSupport{
/**
*
*/
private static final long serialVersionUID = 1L;
private String var;
private String items;
private Iterator iter;
public String getVar() {
return var;
}
public void setVar(String var) {
this.var = var;
}
public String getItems() {
return items;
}
public void setItems(String items) {
this.items = items;
}
public Iterator getIter() {
return iter;
}
public void setIter(Iterator iter) {
this.iter = iter;
}
@Override
public int doStartTag() throws JspException {
Object value=this.pageContext.getAttribute(items);
if(value!=null && value instanceof List){
this.iter=((List)value).iterator();
if(iter.hasNext()){
this.pageContext.setAttribute(var, iter.next());
return TagSupport.EVAL_BODY_INCLUDE; // 执行标签体
}else{
return TagSupport.SKIP_BODY; // 退出标签执行
}
}else{
return TagSupport.SKIP_BODY; // 退出标签执行
}
}
@Override
public int doAfterBody() throws JspException {
if(iter.hasNext()){
this.pageContext.setAttribute(var, iter.next());
return TagSupport.EVAL_BODY_AGAIN; // 再执行一次标签体
}else{
return TagSupport.SKIP_BODY; // 退出标签执行
}
}
}[code=language-java]package com.java1234.tag;
import java.io.IOException;
import java.util.Iterator;
import java.util.List;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.SimpleTagSupport;
import javax.servlet.jsp.tagext.TagSupport;
public class IterateSimpleTag extends SimpleTagSupport{
/**
*
*/
private static final long serialVersionUID = 1L;
private String var;
private String items;
public String getVar() {
return var;
}
public void setVar(String var) {
this.var = var;
}
public String getItems() {
return items;
}
public void setItems(String items) {
this.items = items;
}
@Override
public void doTag() throws JspException, IOException {
Object value=this.getJspContext().getAttribute(items);
if(value!=null && value instanceof List){
Iterator iter=((List)value).iterator();
while(iter.hasNext()){
this.getJspContext().setAttribute(var, iter.next());
this.getJspBody().invoke(null); // 响应页面
}
}
}
}[code=language-java]<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ page import="java.util.*" %>
<%@ taglib prefix="java1234" uri="/WEB-INF/java1234.tld" %>
<!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=UTF-8">
<title>Insert title here</title>
<%
List people=new ArrayList();
people.add("王二小2");
people.add("丝丝光2");
people.add("草泥马2");
pageContext.setAttribute("people", people);
%>
</head>
<body>
<java1234:iterate2 items="people" var="p">
<h2>${p }</h2>
</java1234:iterate2>
</body>
</html>
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