loopservlet.java

Tomcat与Java.Web开发技术详解源代码

package mypack;

import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
import org.apache.velocity.*;
import org.apache.velocity.context.*;
import org.apache.velocity.servlet.*;
import org.apache.velocity.app.*;
import org.apache.velocity.exception.*;

public class LoopServlet extends VelocityServlet
{

  protected Properties loadConfiguration(ServletConfig config)
  throws IOException,FileNotFoundException{
  
    Properties p=new Properties();
    String path=config.getServletContext().getRealPath("/");
    if(path==null){
      System.out.println("VelocityAdd.loadConfiguration():"+
      "unable to get the current webapp root. Using '/'. "); 
      path="/";
    }
    p.setProperty(Velocity.FILE_RESOURCE_LOADER_PATH,path);
    p.setProperty("runtime.log",path+"velocity.log");
    
    return p;
  }
  
  public Template handleRequest(HttpServletRequest request, HttpServletResponse response,Context context){
  
    Template outty=null;
    
    try{
      Hashtable clientlist=new Hashtable();
      
      Client client=new Client();
      client.setFirstname("Xiaowen");
      client.setLastname("Li");
      client.setPhone("56781234");
      clientlist.put(client.getFirstname(),client);

      client=new Client();
      client.setFirstname("Xiaowei");
      client.setLastname("Cao");
      client.setPhone("56782345");
      clientlist.put(client.getFirstname(),client);

      client=new Client();
      client.setFirstname("Xiaojie");
      client.setLastname("Sun");
      client.setPhone("56783456");
      clientlist.put(client.getFirstname(),client);
      
      context.put("clientlist",clientlist);

      outty=getTemplate("loop.vm");
    }catch(ParseErrorException ex1){
      System.out.println("VelocityAdd: parse error for template "+ex1);
    }catch(ResourceNotFoundException ex2){
      System.out.println("VelocityAdd: template not found "+ex2);
    }catch(Exception ex3){
      System.out.println("VelocityAdd: error "+ex3);
    }
    return outty;
  }

}