第一章 JSTL简介
一：jstl简介
jstl全名为：JavaServer Pages Standard Tag Library,中文名叫Jsp标准标签函数库。
jstl是一个标准，且已经定制好的标签函数库，可以应用各种领域。如：基本输出、输入、流程控制、循环、XML文件剖析、资料库查询、文字格式标准化得应用。
jstl分为五大类：
核心标签库(Core tab library)
Il8N格式标签库( Il8N-capable formating library)
SQL标签库(SQL tag library)
XML处理(XML tag library)
函数功能(Functions tag library)
| JSTL | 前置名称 | URL | 示例 |
| 核心标签库 | c | http://java.sun.com/jsp/jstl/core | <c:out> |
| Il8N格式标签库 | fmt | http://java.sun.com/jsp/jstl/fmt | <fmt:formatDate> |
| SQL标签库 | sql | http://java.sun.com/jsp/jstl/sql | <sql:query> |
| XML处理 | xml | http://java.sun.com/jsp/jstl/xml | <x:forbach> |
| 函数功能 | fn | http://java.sun.com/jsp/jstl/functions | <fn:split> |
jstl也支持EL表达式
例如：
//创建一个类
package com.model;
public class Chapter1 {
private int id;
private String username;
private String userPwd;
public Chapter1() {
super();
}
public Chapter1(int id, String username, String userPwd) {
super();
this.id = id;
this.username = username;
this.userPwd = userPwd;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getUserPwd() {
return userPwd;
}
public void setUserPwd(String userPwd) {
this.userPwd = userPwd;
}
}
//创建servlet
package com.action;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.model.Chapter1;
public class Chapter1Action extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doPost(request, response);
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
request.setAttribute("user", new Chapter1(1,"张三","李四"));
request.getRequestDispatcher("/chapter1.jsp").forward(request, response);
}
}
//JSP页面
<%@ page language="java" pageEncoding="utf-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>chapter1.jsp</title>
</head>
<body>
<div>
<div>
<lable>id</lable><br/>
<lable>姓名：</lable><br/>
<lable>密码：</lable>
</div>
<div>
<lable>${user.id}</lable><br/>
<lable>${user.username}</lable><br/>
<lable>${user.userPwd}</lable>
</div>
</div>
</body>
</html>