velocity整合servlet

velocity整合servlet

velocity开发eclipse插件  http://code.google.com/p/veloeclipse/

目录结构
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俩实体类不用说了
看CustomerVelocityServlet类

package  com.velocity.servlet;

import  java.util.ArrayList;
import  java.util.List;

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.servlet.VelocityViewServlet;

import  com.velocity.bean.Department;
import  com.velocity.bean.Employee;

@SuppressWarnings( " serial " )
public   class  CustomerVelocityServlet  extends  VelocityViewServlet{

    
     // 设置返回视图为text/html编码为gbk
    @Override
     protected   void  setContentType(HttpServletRequest request,
            HttpServletResponse response) {
        response.setContentType( " text/html;charset=gbk " );
    }
    
     // 处理请求
    @Override
     protected  Template handleRequest(HttpServletRequest request,
            HttpServletResponse response, Context ctx)  throws  Exception {
        ctx.put( " username " ,  " 张三 " );
        ctx.put( " password " ,  " 123456789 " );
        ctx.put( " age " ,  " 20 " );
        ctx.put( " address " ,  " 陕西西安 " ); 
        ctx.put( " blog " ,  " http://blogjava.net/sxyx2008 " );
        
        List < Employee >  list = new  ArrayList < Employee > ();
        list.add( new  Employee( 1 , " 张三 " , " 陕西西安 " , 18 , new  Department( 1 , " 软件研发部1 " )));
        list.add( new  Employee( 2 , " 张三 " , " 陕西西安 " , 19 , new  Department( 2 , " 软件研发部2 " )));
        list.add( new  Employee( 3 , " 张三 " , " 陕西西安 " , 20 , new  Department( 3 , " 软件研发部3 " )));
        list.add( new  Employee( 4 , " 张三 " , " 陕西西安 " , 21 , new  Department( 4 , " 软件研发部4 " )));
        list.add( new  Employee( 5 , " 张三 " , " 陕西西安 " , 22 , new  Department( 5 , " 软件研发部5 " )));
        list.add( new  Employee( 6 , " 张三 " , " 陕西西安 " , 23 , new  Department( 6 , " 软件研发部6 " )));
        list.add( new  Employee( 7 , " 张三 " , " 陕西西安 " , 24 , new  Department( 7 , " 软件研发部7 " )));
        list.add( new  Employee( 8 , " 张三 " , " 陕西西安 " , 25 , new  Department( 8 , " 软件研发部8 " )));
        list.add( new  Employee( 9 , " 张三 " , " 陕西西安 " , 26 , new  Department( 9 , " 软件研发部9 " )));
        list.add( new  Employee( 10 , " 张三 " , " 陕西西安 " , 27 , new  Department( 10 , " 软件研发部10 " )));
        
        ctx.put( " list " , list);
         // 调用父类的方法getTemplate()
         return  getTemplate( " demo.vm " ,  " gbk " );
    }
    
}

继承org.apache.velocity.tools.view.servlet.VelocityViewServlet，覆写setContentType和handleRequest方法,其中setContentType用于设置浏览器的响应,handleRequest处理用户的请求,返回Template,我们调用父类中的getTemplate()方法返回
在WEB-INF目录下创建一vm目录,用于存放模板文件
在WEB-INF目录下创建velocity.properties(名字可以任意取)
内容为

resource.loader  =  webapp  
webapp.resource.loader. class   =  org.apache.velocity.tools.view.servlet.WebappLoader
webapp.resource.loader.path =/ WEB - INF / vm /   
input.encoding = " gbk "
output.encoding = " gbk "

resource.loader = webapp 加载方式为webapp
webapp.resource.loader.class = org.apache.velocity.tools.view.servlet.WebappLoader    webapp方式加载处理类
webapp.resource.loader.path=/WEB-INF/vm/   模板文件目录
input.encoding="gbk"  输入字符编码
output.encoding="gbk"  输出字符编码

配置web.xml

< servlet >
         < servlet-name > customerVelocityServlet </ servlet-name >
         < servlet-class > com.velocity.servlet.CustomerVelocityServlet </ servlet-class >
         < init-param >
             < param-name > org.apache.velocity.properties </ param-name >
             < param-value > /WEB-INF/velocity.properties </ param-value >
         </ init-param >
     </ servlet >
     < servlet-mapping >
         < servlet-name > customerVelocityServlet </ servlet-name >
         < url-pattern > /customerVelocityServlet </ url-pattern >
     </ servlet-mapping >

<init-param>
   <param-name>org.apache.velocity.properties</param-name>
   <param-value>/WEB-INF/velocity.properties</param-value>
</init-param>
加载自定义的velocity.properties

demo.vm

<! DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
< HTML >
  < HEAD >
   < TITLE >  velocity  </ TITLE >
  </ HEAD >

##嘿嘿,我是velocity中的注释噢
#*
    嘿嘿,我也是velocity中的注释噢
*#

  < BODY >
     < h1 > hehe,这是经过由servlet返回的velocity视图 </ h1 >
    hello ${username},这是你的信息
     < ul >
         < li > 用户密码为:${password} </ li >
         < li > 年龄为:${age} </ li >
         < li > 出生地址为:${address} </ li >
         < li > 个人主页为: < a  href ='${blog}' > ${blog} </ a ></ li >
     </ ul >
    
     < br />
    
    #foreach($emp in $!{list})
        $!{velocityCount} &nbsp;&nbsp;&nbsp;&nbsp;
        $!{emp.id}  &nbsp;&nbsp;&nbsp;&nbsp;
        $!{emp.ename}  &nbsp;&nbsp;&nbsp;&nbsp;
        $!{emp.eaddress}  &nbsp;&nbsp;&nbsp;&nbsp;
        $!{emp.age}  &nbsp;&nbsp;&nbsp;&nbsp;
        $!{emp.department.id}  &nbsp;&nbsp;&nbsp;&nbsp;
        $!{emp.department.deptname}  < hr />
    #end
    
  </ BODY >
</ HTML >

http://localhost:8080/velocityweb/customerVelocityServlet

效果图

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