Velocity初尝试

为什么80%的码农都做不了架构师？>>>

hello.vm

<html><head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/><title>Insert title here</title></head><body bgcolor="#ffffff"><center><h2>Hello Velocity </h2>
<form method="post" action="LayServlet" name=""><table><tr><td  align="center"><input type="text" name="username" value=""/></td></tr><tr><td  align="center"><input type="password" name="pwd" value=""/></td></tr><tr><td  align="center"><input type="submit" name="submit" value="sub"/></td></tr></table>
</form></center></body>
</html>

结果页面 helloResult.vm

<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/><title>Insert title here</title></head><body bgcolor="#ffffff"><center><h2>Hello Velocity yang</h2><table width="100" cellpadding="5" cellspacing="1" bordercolor="#333333"><tr><td bgcolor="#eeeeee" align="center">Names</td></tr>#foreach ($name in $theList)  <tr><td bgcolor="#6666FF" align="center">$name</td></tr>#end  <tr><td >you win</td></tr></table></center></body>
</html>

LayoutServlet

package test_vm;import java.io.BufferedWriter;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.util.Properties;
import java.util.Vector;import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;import org.apache.velocity.Template;
import org.apache.velocity.VelocityContext;
import org.apache.velocity.app.Velocity;
import org.apache.velocity.tools.view.VelocityLayoutServlet;/*** Servlet implementation class LayServlet*/
public class LayServlet extends VelocityLayoutServlet {private static final long serialVersionUID = 1L;/*** @see VelocityLayoutServlet#VelocityLayoutServlet()*/public LayServlet() {super();// TODO Auto-generated constructor stub}/*** @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)*/public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {// TODO Auto-generated method stubthis.processDoc(request, response);}/*** @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)*/public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {// TODO Auto-generated method stubthis.processDoc(request, response);}public void processDoc(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException{Properties prop = new Properties();  String path = this.getServletContext().getRealPath("/");  prop.setProperty(Velocity.FILE_RESOURCE_LOADER_PATH, path + "xa_template/");  Velocity.init(prop);VelocityContext vContext = new VelocityContext();Template template = Velocity.getTemplate("helloResult.vm");String p1 = request.getParameter("username");  String p2 = request.getParameter("pwd");   Vector personList = new Vector();  personList.addElement(p1);  personList.addElement(p2);  vContext.put("theList", personList); //将模板数据 list放置到上下文环境context中  PrintWriter writer =response.getWriter();template.merge(vContext,writer);writer.flush();writer.close();}}

web.xml 配置

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5"><display-name>xinai</display-name><welcome-file-list><welcome-file>/xa_template/hello.vm</welcome-file></welcome-file-list><servlet><servlet-name>velocity</servlet-name><servlet-class>org.apache.velocity.tools.view.VelocityLayoutServlet</servlet-class></servlet><servlet-mapping><servlet-name>velocity</servlet-name><url-pattern>*.vm</url-pattern></servlet-mapping><servlet><description></description><display-name>LayServlet</display-name><servlet-name>LayServlet</servlet-name><servlet-class>test_vm.LayServlet</servlet-class></servlet><servlet-mapping><servlet-name>LayServlet</servlet-name><url-pattern>/LayServlet</url-pattern></servlet-mapping>
</web-app>

注意：servlet继承VelocityLayoutServlet 配置文件velocity.properties必须有如下代码片段

# Filepath for error template,
#  relative to web application root directory
tools.view.servlet.error.template = error.vm     #错误页# Directory for layout templates,
#  relative to web application root directory
tools.view.servlet.layout.directory = xa_template/   #vm文件所在路径# Filepath of the default layout template
#  relative to the layout directory
#  NOT relative to the root directory of the webapp!
tools.view.servlet.layout.default.template =  hello.vm    #默认页

依赖jar包

commons-beanutils-1.7.0.jar

commons-collections-3.2.jar

commons-digester-1.8.jar

commons-logging-1.1.jar

velocity-1.7-dep.jar

velocity-1.7.jar

velocity-tools-2.0.jar

velocity-tools-generic-2.0.jar

velocity-tools-view-2.0.jar

转载于:https://my.oschina.net/UpBoy/blog/155572

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