GAE/J + Velocity メモ。

とりあえずミニマムで。

■velocity/velocity-toolsのDL
http://velocity.apache.org/download.cgi

■必要なjar
* commons-beanutils-1.7.0.jar
* commons-collections-3.2.1.jar
* commons-digester-1.8.jar
* commons-lang-2.4.jar
* commons-logging-1.1.jar
* velocity-1.7.jar
* velocity-tools-view-2.0.jar

■WEB-INF/velocity.propertiesを作成
velocity-1.7/src/java/org/apache/velocity/runtime/defaults/velocity.properties
をコピーして以下を変更。
* input.encoding=UTF-8
* output.encoding=UTF-8
* file.resource.loader.path = WEB-INF/vm/page

■web.xmlに以下を追記

    notFoundFilter
    gaeVelocityTest.servlet.NotFoundFilter


    notFoundFilter
    *.vm
    REQUEST


    velocityServlet
    gaeVelocityTest.servlet.MyVelocityServlet


    velocityServlet
    /velocity


    velocity
    org.apache.velocity.tools.view.servlet.VelocityViewServlet
    
        org.apache.velocity.properties/WEB-INF/velocity.properties


    velocity
    *.vm

■appengine-web.xmlに以下を追記

true

■NotFoundFilter(vmファイルへの直アクセスを防ぐ)

package gaeVelocityTest.servlet;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class NotFoundFilter implements Filter {
    @Override
    public void destroy() {
    }

    @Override
    public void doFilter (
             ServletRequest req, ServletResponse res, FilterChain chain)
             throws IOException, ServletException {
         
        ((HttpServletResponse)res).sendError(404, ((HttpServletRequest)req).getRequestURI());
   }

   @Override
   public void init(FilterConfig conf) throws ServletException {
   }
}

■MyVelocityServlet

package gaeVelocityTest.servlet;

import java.io.IOException;

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

import org.apache.velocity.tools.view.VelocityViewServlet;

public class MyVelocityServlet extends VelocityViewServlet {

    private static final long serialVersionUID = -2215018323215813266L;

    public void doGet(HttpServletRequest req, HttpServletResponse res) throws IOException {
        try {
            req.setAttribute("val", "テスト");
            req.getRequestDispatcher("/test.vm").forward(req, res);
        } catch (ServletException e) {
            e.printStackTrace();
        }
    }

}

■WEB-INF/vm/page/test.vm
--
$val
--

■確認
http://127.0.0.1:8888/velocity にアクセス。
デプロイして同様にアクセス。

■参考
GAE/JでVelocity
http://blog.suz-lab.com/2009/12/gaejvelocity.html

GAE/Javaでウェブアプリ開発: Velocityテンプレートエンジン（２）
http://blog.livedoor.jp/ykohat/archives/50788389.html

vmファイルへの直アクセスを防ぐ
http://d.hatena.ne.jp/paulownia/20090604/1244085243