はじめに

http://blogs.yahoo.co.jp/dk521123/34456704.html

で使った Velocity をWebで使用してみる

設定手順

 [1] 以下のダウンロード先から以下を落としてきて、解凍する

　* 「velocity-tools-X.X.zip」(今回「velocity-tools-2.0.zip」)

http://velocity.apache.org/download.cgi

 [2] ダウンロードしたファイルのLibのJarを、Eclipseの対象プロジェクトに追加する

　* 「velocity-X.X.X.jar」
　* 「velocity-tools-X.X.jar」
　* 「commons-digester-X.X.jar」(今回「commons-digester-1.8.jar」)
など

 [3] web.xml に以下の記述を追記する(以下のサンプルを参照のこと。)
～～～～～～
  <servlet>
    <servlet-name>velocity</servlet-name>
    <servlet-class>org.apache.velocity.tools.view.servlet.VelocityViewServlet</servlet-class>
    <init-param>
      <param-name>org.apache.velocity.toolbox</param-name>
      <param-value>/WEB-INF/velocity-toolbox.xml</param-value>
    </init-param>
    <init-param>
      <param-name>org.apache.velocity.properties</param-name>
      <param-value>/WEB-INF/velocity.properties</param-value>
    </init-param>
    <load-on-startup>10</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>velocity</servlet-name>
    <url-pattern>*.vm</url-pattern>
  </servlet-mapping>
～～～～～～
 [4] WEB-INF配下にファイル「velocity.properties」「velocity-toolbox.xml」を作成し、内容は、以下の様にする

■velocity.properties
～～～～～～
resource.loader = webapp
webapp.resource.loader.class = org.apache.velocity.tools.view.servlet.WebappLoader 
webapp.resource.loader.path=/WEB-INF/templates
webapp.resource.loader.cache = true
runtime.log=/WEB-INF/velocity.log
input.encoding=UTF-8
output.encoding=UTF-8
default.contentType=text/html; charset=UTF-8
～～～～～～

■velocity-toolbox.xml
～～～～～～
<?xml version="1.0" encoding="UTF-8" ?>
<toolbox>
</toolbox>
～～～～～～

サンプル

 * 苦戦した...

ファイル構成

SampleService(Project)
 +- lib
 |   + velocity-1.6.2.jar
 |   + velocity-tools-2.0.jar
 |   + commons-digester-1.8.jar
 |   + ・・・略・・・
 +- src
 |   + com.sample.servlets.SampleVelocityServlet.java
 |   + com.sample.servlets.SampleMessageBean.java
 +- WebContent
     + WEB-INF
        + velocity-toolbox.xml
        + velocity.properties
        + templates
           + SampleTemplete.vm

SampleVelocityServlet.java

package com.sample.servlets;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.velocity.Template;
import org.apache.velocity.context.Context;
import org.apache.velocity.tools.view.VelocityViewServlet;

/**
 * Servlet implementation class SampleApacheServlet
 */
public class SampleVelocityServlet extends VelocityViewServlet {
   private static final long serialVersionUID = 1L;

   public Template handleRequest(HttpServletRequest request,
         HttpServletResponse response, Context context) {
      SampleMessageBean MessageBean =
            new SampleMessageBean("Mike", "2015-01-08", "111-222", "Java Program Book", 1000);
      context.put("msgBean", MessageBean);
      
      Template template = null;
      try {
         template = getTemplate("SampleTemplete.vm");
      } catch (Exception e) {
         System.out.println("Error " + e);
      }
      return template;
   }
}

SampleMessageBean.java

package com.sample.servlets;

public class SampleMessageBean {
   private String userName;
   private String date;
   private String productId;
   private String productName;
   private int price;

   public SampleMessageBean(
         String userName, String date,
         String productId, String productName, int price) {
      this.userName = userName;
      this.date = date;
      this.productId = productId;
      this.productName = productName;
      this.price = price;
   }

   public void setUserName(String userName) {
      this.userName = userName;
   }

   public String getUserName() {
      return userName;
   }

   public String getDate() {
      return date;
   }

   public void setDate(String date) {
      this.date = date;
   }

   public String getProductId() {
      return productId;
   }

   public void setProductId(String productId) {
      this.productId = productId;
   }

   public String getProductName() {
      return productName;
   }

   public void setProductName(String productName) {
      this.productName = productName;
   }

   public int getPrice() {
      return price;
   }

   public void setPrice(int price) {
      this.price = price;
   }
}

SampleTemplete.vm

* テンプレートファイル

<html>
<body>
<h1>$msgBean.userName様の購入履歴</h1>
<table border="3">
<caption>日付：$msgBean.date</caption>
<tr>
<th>商品ID</th>
<th>商品名</th>
<th>値段</th>
</tr>
<tr>
<td>$msgBean.productId</td>
<td>$msgBean.productName</td>
<td>$msgBean.price</td>
</tr>
</table>
</body>
</html>

web.xml

<?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>SampleService</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
  <servlet>
    <servlet-name>SampleVelocityServlet</servlet-name>
    <servlet-class>com.sample.servlets.SampleVelocityServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>SampleVelocityServlet</servlet-name>
    <url-pattern>/SampleVelocityServlet</url-pattern>
  </servlet-mapping>
  <servlet>
    <servlet-name>velocity</servlet-name>
    <servlet-class>org.apache.velocity.tools.view.servlet.VelocityViewServlet</servlet-class>
    <init-param>
      <param-name>org.apache.velocity.toolbox</param-name>
      <param-value>/WEB-INF/velocity-toolbox.xml</param-value>
    </init-param>
    <init-param>
      <param-name>org.apache.velocity.properties</param-name>
      <param-value>/WEB-INF/velocity.properties</param-value>
    </init-param>
    <load-on-startup>10</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>velocity</servlet-name>
    <url-pattern>*.vm</url-pattern>
  </servlet-mapping>
</web-app>