读取web.xml参数,jsp动作指令,jsp页面发布xml或者pdf数据
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读取web.xml参数
(1) 后台读取
import java.io.IOException;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class TestServlet extends HttpServlet{@Overrideprotected void service(HttpServletRequest req, HttpServletResponse resp)throws ServletException, IOException {System.out.println("进入servlet");String servletName = this.getInitParameter("servletName");System.out.println(this.getServletContext().getInitParameter("userName"));System.out.println(servletName);resp.sendRedirect("index.jsp");}}import javax.naming.InitialContext;import javax.servlet.ServletContextEvent;import javax.servlet.ServletContextListener;public class TestListner implements ServletContextListener{@Overridepublic void contextDestroyed(ServletContextEvent arg0) {// TODO Auto-generated method stub}@Overridepublic void contextInitialized(ServletContextEvent arg0) {String userName = arg0.getServletContext().getInitParameter("userName");arg0.getServletContext().setAttribute("Name", userName);System.out.println(userName);try {System.out.println(new InitialContext().lookup("java:comp/env/upload-path"));} catch (Exception e) {e.printStackTrace();}}}(2) 页面读取包括el表达式读取<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%><%@page import="cn.bean.User"%><%String path = request.getContextPath();String basePath = request.getScheme() + "://"+ request.getServerName() + ":" + request.getServerPort()+ path + "/";%><%String path2 = application.getRealPath("/imgs"); %><!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><%List al = new ArrayList();al.add("session1");al.add("session2");al.add("session3");application.setAttribute("list",al);User u = new User();u.setUserName("tom");application.setAttribute("user",u); %> <% List a = (List)application.getAttribute("list"); a.add("session4"); User u2 = (User)application.getAttribute("user"); u2.setUserName("marray"); %><body>el:${initParam.userName}<br/>el:${initParam.servletName}<br />application:<%=application.getAttribute("Name")%><br />el、application:${applicationScope.Name }<br /><%=((List)application.getAttribute("list")).size() %><br/><%=((User)application.getAttribute("user")).getUserName() %></body></html>(3) web配置<?xml version="1.0" encoding="UTF-8"?><web-app version="2.5" 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-app_2_5.xsd"><env-entry><env-entry-name>datasourceJndiName</env-entry-name><env-entry-type>java.lang.String</env-entry-type><env-entry-value>qqt_datasource</env-entry-value><!--injection-target><injection-target-class>qqt.interfaces.MyDB</injection-target-class><injection-target-name>datasourceJndiName</injection-target-name></injection-target--></env-entry><context-param><description>test</description><param-name>userName</param-name><param-value>admin</param-value></context-param><listener><listener-class>TestListner</listener-class></listener><servlet><servlet-name>TestServlet</servlet-name><servlet-class>TestServlet</servlet-class><init-param><param-name>servletName</param-name><param-value>TestServlet</param-value></init-param></servlet><servlet-mapping><servlet-name>TestServlet</servlet-name><url-pattern>/Servlet</url-pattern></servlet-mapping><welcome-file-list><welcome-file>index.jsp</welcome-file></welcome-file-list><login-config><auth-method>BASIC</auth-method></login-config></web-app>
jsp动作指令以及jstl核心标签的循环
(1) 页面实例
<%@ 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 onload="a()"> <!-- jsp动作指令所描述的bean必须是要有无参构造 --> <jsp:useBean id="user1" class="com.bean.User" scope="page"></jsp:useBean> <jsp:setProperty property="uname" name="user1" value="marry"/> <jsp:setProperty property="uid" name="user1" value="1"/> <jsp:useBean id="user2" class="com.bean.User" scope="session"></jsp:useBean> <jsp:useBean id="user3" class="com.bean.User" scope="request"></jsp:useBean> <jsp:setProperty property="uname" name="user3" value="tom"/> <jsp:useBean id="user4" class="com.bean.User" scope="application"></jsp:useBean> <jsp:setProperty property="uname" name="user4" value="marry"/> page:<%=pageContext.getAttribute("user1") %><br/> uname:<jsp:getProperty property="uname" name="user1"/><br/> <hr/> session:<%=session.getAttribute("user2") %><br/> request:<%=request.getAttribute("user3") %><br/> <%--<jsp:forward page="view01.jsp"></jsp:forward>--> --%> <%String username ="<jsp:getProperty property='uname' name='user1'/>";%> 标签赋值java代码:<%="<jsp:getProperty property='uname' name='user1'/>"%> <script type="text/javascript"> function a(){ var param = '<%=pageContext.getAttribute("user1") %>'; var param2 = '<jsp:getProperty property="uname" name="user1"/>'; <%if(1==1){%> alert(param2); <% }%> } </script> </body></html>(2) 页面实例<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%><%@page import="com.bean.User"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><%@taglib prefix="cc" uri="http://java.sun.com/jsp/jstl/core" %><%@taglib prefix="c" uri="http://java.sun.com/jsf/core"%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html> <head> <base href="<%=basePath%>"> <title>My JSP 'view01.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> <%@include file="/view02.jsp" %> <br/> <body> <cc:set scope="application" value="user4" var="user4"></cc:set> <br> <!-- userBean 定义两个相同的bean,意思为有就使用,没有就创建 --> <jsp:useBean id="user3" class="com.bean.User" scope="request"></jsp:useBean> <jsp:getProperty property="uname" name="user3"/><br/> <cc:set var="abc" value="2" ></cc:set> <cc:choose> <cc:when test="${abc==1}">1</cc:when> <cc:when test="${abc==2}">2</cc:when> </cc:choose> <br/> <cc:forEach begin="1" end="10" step="2" varStatus="id" var="cc"> <input type="submit" value="${cc }"/> </cc:forEach> <br/> <%List al = new ArrayList(); User u1 = new User("t1","tom"); User u2 = new User("t2","marry"); User u3 = new User("t3","cat"); al.add(u1);al.add(u2);al.add(u3);al.add("String"); pageContext.setAttribute("al",al); %> <cc:forEach items="${al}" var="l" varStatus="ix"> Last：${ix.last} <br/> First：${ix.first}<br/>次数:(ix.index) <cc:if test="${l.class!=com.bean.User}"><div>index：${ix.index}:${l}</div></cc:if> <cc:if test="${l.class==com.bean.User}"><div>index：${ix.index}:${l.uname}</div></cc:if> </cc:forEach> </body></html>jsp页面发布xml或者pdf数据
(1) 发布xml数据ps:从后台发送数据
后台
①
(2) 页面发布pdf数据
a java发布
package com.servlet;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;import java.io.OutputStream;import java.io.PrintWriter;import java.net.URL;import javax.servlet.ServletException;import javax.servlet.ServletRequest;import javax.servlet.ServletResponse;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import com.bean.User;@SuppressWarnings("serial")public class XmlServlet extends HttpServlet{@Overrideprotected void service(HttpServletRequest req, HttpServletResponse resp)throws ServletException, IOException {System.out.println("protected");req.setCharacterEncoding("utf-8");resp.setHeader("Cache-Control", "no-cache"); resp.setHeader("Cache-Control", "no-store"); resp.setContentType("application/xml; charset=utf-8");PrintWriter out = resp.getWriter();/** * OutputStream 只能输入二进制数据; *///OutputStream ops = resp.getOutputStream();out.print(new XmlServlet().getXmlInfo());out.flush();out.close();}private String getXmlInfo() { StringBuilder sb = new StringBuilder(); sb.append("<videoSend>"); sb.append("<header>"); sb.append("<sid>1</sid>"); sb.append("<type>service</type>"); sb.append("</header>"); sb.append("<service name=\"videoSend\">"); sb.append("<fromNum>0000021000011001</fromNum>"); sb.append("<toNum>33647405</toNum>"); sb.append("<videoPath>mnt/5.0.217.50/resources/80009.mov</videoPath>"); sb.append("<chargeNumber>0000021000011001</chargeNumber>"); sb.append("</service>"); sb.append("</videoSend>"); return sb.toString();}public static void main(String[] args) throws Exception{URL webUrl = new URL("http://localhost/views/XmlServlet");InputStreamReader reader = new InputStreamReader(webUrl.openStream());BufferedReader breader = new BufferedReader(reader);StringBuilder result = new StringBuilder();String line = null;while ((line = breader.readLine()) != null) {result.append(line);}System.out.println(result.toString());}} 2.第二种页面发布xml数据或者json的方式后台
package cn.itcast.servlet;import java.io.IOException;import java.util.List;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import cn.itcast.domain.News;import cn.itcast.service.VideoNewsService;import cn.itcast.service.impl.VideoNewsServiceBean;public class ListServlet extends HttpServlet {private static final long serialVersionUID = 1L;private VideoNewsService service = new VideoNewsServiceBean();protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {doPost(request, response);}protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {List<News> videos = service.getLastNews();String format = request.getParameter("format");if("json".equals(format)){// [{id:56,title:"xxxxx",timelength:90},{id:16,title:"xbbx",timelength:20}]StringBuilder builder = new StringBuilder();builder.append('[');for(News news : videos){builder.append('{');builder.append("id:").append(news.getId()).append(',');builder.append("title:\"").append(news.getTitle()).append("\",");builder.append("timelength:").append(news.getTimelength());builder.append("},");}builder.deleteCharAt(builder.length() - 1);builder.append(']');request.setAttribute("json", builder.toString());request.getRequestDispatcher("/WEB-INF/page/jsonvideonews.jsp").forward(request, response);}else{request.setAttribute("videos", videos);request.getRequestDispatcher("/WEB-INF/page/videonews.jsp").forward(request, response);}}} 页面①
<%@ page language="java" contentType="text/plain; charset=UTF-8" pageEncoding="UTF-8"%>${json}②<%@ page language="java" contentType="text/xml; charset=UTF-8" pageEncoding="UTF-8"%><%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%><?xml version="1.0" encoding="UTF-8"?><videonews><c:forEach items="${videos}" var="video"><news id="${video.id}"><title>${video.title}</title><timelength>${video.timelength}</timelength></news></c:forEach></videonews>(2) 页面发布pdf数据
a java发布
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%><%@page import="java.io.File"%><%@page import="java.io.DataOutput"%><%@page import="java.io.DataOutputStream"%><%@page import="java.io.DataInputStream"%><%@page import="java.io.FileInputStream"%><%@page import="java.io.BufferedOutputStream"%><%@page import="java.io.OutputStream"%><%@page import="java.io.BufferedReader"%><%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 'pdf.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> <% out.clear(); out = pageContext.pushBody(); response.setContentType("application/pdf"); try{ String strPdfPath = new String("f://2015.pdf"); File file = new File(strPdfPath); if(file.exists()){ BufferedOutputStream temps = new BufferedOutputStream(response.getOutputStream()); DataInputStream in = new DataInputStream(new FileInputStream(file)); byte[] b =new byte[2048]; while((in.read(b))!=-1){ temps.write(b); temps.flush(); } in.close(); temps.close(); }else{ out.print(strPdfPath+"文件不存在!"); } }catch(Exception e){ out.print(e.getMessage()); } %> <body> </body></html> b 标签发布<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%><%@page import="java.io.File"%><%@page import="java.io.DataOutput"%><%@page import="java.io.DataOutputStream"%><%@page import="java.io.DataInputStream"%><%@page import="java.io.FileInputStream"%><%@page import="java.io.BufferedOutputStream"%><%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 'pdf.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> <object classid="clsid:CA8A9780-280D-11CF-A24D-444553540000" border="0"> <param name="_Version" value="65539"> <param name="_ExtentX" value="20108"> <param name="_ExtentY" value="10866"> <param name="_StockProps" value="0"> <param name="SRC" value="2015.pdf"> </object> <object data="2014.pdf" type="application/pdf" border="0" width="70%" height="800"> alt:<a href="">2015.pdf</a> </object> </body></html>
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