jsp的一些基本语法
2013-11-03 12:23
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jsp页面内容
生成servlet的内容：
包含页面
如果是错误页面，可标记为错误页面，将可获取到错误信息。
<%
String message = exception.getMessage();
out.write(message);
%>
以下代码将先输出 haha 再输出 message ,因为数据最终都是通过response.getWriter()输出的，out.write()相当于另外一个缓冲区，out.write()执行
完后将再进入response缓冲区，最后再将response的数据发给tomcat执行输出。
pageContext封装了所有域对象，经常用在自定义标签
常用jsp标签
取参数
String data=(String)request.getParameter("data");
System.out.println("data:"+data);
String data2=(String)request.getParameter("data2");
System.out.println("data2:"+data2);
将jsp页面映射到servlet
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'index.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
<%! public void a(){} %> <!-- 通过声明， 可在servlet中定义方法，注意前面的"!"符合 -->
<%! static{System.out.println("static");} %>
<%
Date date=new Date();
String time=date.toLocaleString();
out.write(time);
%>
<br>
<%=time%> <!-- 脚本表达式，用于向浏览器输出数据 -->
<%for(int i=0;i<5;i++){ %>
hello for
<%} %>
<%-- jsp注释内容 --%>
</body>
</html>生成servlet的内容：
package org.apache.jsp;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.jsp.*;
import java.util.*;
public final class index_jsp extends org.apache.jasper.runtime.HttpJspBase
implements org.apache.jasper.runtime.JspSourceDependent {
public void a(){}
static{System.out.println("static");}
private static final javax.servlet.jsp.JspFactory _jspxFactory =
javax.servlet.jsp.JspFactory.getDefaultFactory();
private static java.util.List<java.lang.String> _jspx_dependants;
private javax.el.ExpressionFactory _el_expressionfactory;
private org.apache.tomcat.InstanceManager _jsp_instancemanager;
public java.util.List<java.lang.String> getDependants() {
return _jspx_dependants;
}
public void _jspInit() {
_el_expressionfactory = _jspxFactory.getJspApplicationContext(getServletConfig().getServletContext()).getExpressionFactory();
_jsp_instancemanager = org.apache.jasper.runtime.InstanceManagerFactory.getInstanceManager(getServletConfig());
}
public void _jspDestroy() {
}
public void _jspService(final javax.servlet.http.HttpServletRequest request, final javax.servlet.http.HttpServletResponse response)
throws java.io.IOException, javax.servlet.ServletException {
final javax.servlet.jsp.PageContext pageContext;
javax.servlet.http.HttpSession session = null;
final javax.servlet.ServletContext application;
final javax.servlet.ServletConfig config;
javax.servlet.jsp.JspWriter out = null;
final java.lang.Object page = this;
javax.servlet.jsp.JspWriter _jspx_out = null;
javax.servlet.jsp.PageContext _jspx_page_context = null;
try {
response.setContentType("text/html;charset=UTF-8");
pageContext = _jspxFactory.getPageContext(this, request, response,
null, true, 8192, true);
_jspx_page_context = pageContext;
application = pageContext.getServletContext();
config = pageContext.getServletConfig();
session = pageContext.getSession();
out = pageContext.getOut();
_jspx_out = out;
out.write('\r');
out.write('\n');
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
out.write("\r\n");
out.write("\r\n");
out.write("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">\r\n");
out.write("<html>\r\n");
out.write(" <head>\r\n");
out.write(" <base href=\"");
out.print(basePath);
out.write("\">\r\n");
out.write(" \r\n");
out.write(" <title>My JSP 'index.jsp' starting page</title>\r\n");
out.write(" \r\n");
out.write("\t<meta http-equiv=\"pragma\" content=\"no-cache\">\r\n");
out.write("\t<meta http-equiv=\"cache-control\" content=\"no-cache\">\r\n");
out.write("\t<meta http-equiv=\"expires\" content=\"0\"> \r\n");
out.write("\t<meta http-equiv=\"keywords\" content=\"keyword1,keyword2,keyword3\">\r\n");
out.write("\t<meta http-equiv=\"description\" content=\"This is my page\">\r\n");
out.write("\t<!--\r\n");
out.write("\t<link rel=\"stylesheet\" type=\"text/css\" href=\"styles.css\">\r\n");
out.write("\t-->\r\n");
out.write("\r\n");
out.write(" </head>\r\n");
out.write(" \r\n");
out.write(" <body>\r\n");
out.write(" ");
out.write(" <!-- 閫氳繃澹版槑锛?鍙湪servlet涓畾涔夋柟娉曪紝娉ㄦ剰鍓嶉潰鐨刓"!\"绗﹀悎 -->\r\n");
out.write(" ");
out.write("\r\n");
out.write(" ");
Date date=new Date();
String time=date.toLocaleString();
out.write(time);
out.write("\r\n");
out.write(" <br>\r\n");
out.write(" ");
out.print(time);
out.write(" <!-- 鑴氭湰琛ㄨ揪寮忥紝鐢ㄤ簬鍚戞祻瑙堝櫒杈撳嚭鏁版嵁 -->\r\n");
out.write(" \r\n");
out.write(" ");
for(int i=0;i<5;i++){
out.write("\r\n");
out.write(" hello for\r\n");
out.write(" ");
}
out.write("\r\n");
out.write(" \r\n");
out.write(" ");
out.write("\r\n");
out.write(" </body>\r\n");
out.write("</html>\r\n");
} catch (java.lang.Throwable t) {
if (!(t instanceof javax.servlet.jsp.SkipPageException)){
out = _jspx_out;
if (out != null && out.getBufferSize() != 0)
try { out.clearBuffer(); } catch (java.io.IOException e) {}
if (_jspx_page_context != null) _jspx_page_context.handlePageException(t);
}
} finally {
_jspxFactory.releasePageContext(_jspx_page_context);
}
}
}包含页面
<%@ include file="/public/head.jsp" %> 静态包含
<% request.getRequestDispatcher("/public/head.jsp").include(request, response); %> 动态包含如果是错误页面，可标记为错误页面，将可获取到错误信息。
<%@ page language="java" import="java.util.*" isErrorPage="true" pageEncoding="UTF-8"%>
<%
String message = exception.getMessage();
out.write(message);
%>
以下代码将先输出 haha 再输出 message ,因为数据最终都是通过response.getWriter()输出的，out.write()相当于另外一个缓冲区，out.write()执行
完后将再进入response缓冲区，最后再将response的数据发给tomcat执行输出。
<%
String message = exception.getMessage();
out.write(message);
response.getWriter().write("haha");
%>pageContext封装了所有域对象，经常用在自定义标签
<%
request.setAttribute("data", "aaa");
pageContext.setAttribute("data", "bbb",PageContext.REQUEST_SCOPE);
String data = (String) pageContext.getAttribute("data",
PageContext.REQUEST_SCOPE);
out.write(data);
String data2=(String)pageContext.findAttribute("data");
out.write(data2);
%>
${data} <%-- el表达式 --%>
<% pageContext.forward("/index2.jsp"); %>
<% pageContext.include("/public/head.jsp"); %>常用jsp标签
<jsp:forward page="/index2.jsp"></jsp:forward> <jsp:include page="/public/head.jsp"></jsp:include> <!-- 动态标签 -->
<jsp:forward page="/servlet/testServlet?data2=123"> <jsp:param value="value" name="data" /> </jsp:forward>
取参数
String data=(String)request.getParameter("data");
System.out.println("data:"+data);
String data2=(String)request.getParameter("data2");
System.out.println("data2:"+data2);
将jsp页面映射到servlet
<servlet> <servlet-name>xxx</servlet-name> <jsp-file>/index3.jsp</jsp-file> </servlet> <servlet-mapping> <servlet-name>xxx</servlet-name> <url-pattern>/1.html</url-pattern> </servlet-mapping>
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