超级简单的mvc框架实现AJF-技术开发专区

超级简单的mvc框架实现AJF

作者：来自ITPUB论坛编辑： cynthia 2008-01-17 00:00

【IT168 技术文档】AJF参考struts,webwork实现,

共5个类

AjfAction.java
AjfServlet.java
AjfView.java
AjfConfig.java
AjfUtil.java

主要类2个

AjfServlet.java
AjfAction.java

AjfServlet 相当于 webwork的com.opensymphony.webwork.dispatcher.ServletDispatcher
AjfAction 相当于 webwork,struts中的action

子类继承AjfAction，实现service方法

AjfView获取request中的attribute

a.特点：

1.废弃formbean,与webwork类似
2.http request 封装,动态注入，与webwork类似
3.零配置文件(从简易性上考虑，没有使用配置文件,以后会加入配置文件)

直接提交action类名
如/com.zjuhg2k.mvc.demo.HelloAction.ajf
AjfServlet解析该请求，提取action类名，实例化action类
action的service方法直接返回视图的url 如 /mvc/hello.jsp

b.需要改进加强的地方

1.配置文件

2.异常处理

3.前后台验证支持

c.web.xml配置

    < servlet>
< servlet-name>ajf< /servlet-name>
< servlet-class>com.zjuhg2k.mvc.AjfServlet< /servlet-class>
< /servlet>
< servlet-mapping>
< servlet-name>ajf< /servlet-name>
< url-pattern>*.ajf< /url-pattern>
< /servlet-mapping>

d.一个简单的例子

1.action类 HelloAction.java

package com.zjuhg2k.mvc.action;
import com.zjuhg2k.mvc.*;
import com.hoson.*;
public class HelloAction extends AjfAction{
public String service(){
java.sql.Timestamp nowTime = StringUtil.getNowTime();
add("time",nowTime);//add data to model 

return "/mvc/hello.jsp";//return jsp view 
}
}

2.view /mvc/hello.jsp

< %@page contentType="text/html;charset=GBK"%>
< %@page import="com.zjuhg2k.mvc.*"%>
hello,< %=AjfView.get(request,"name")%>
< br>time now is < %=AjfView.get(request,"time")%>

3.访问路径

/com.zjuhg2k.mvc.demo.HelloAction.ajf?name=tiger

e.代码

1.AjfServlet.java

package com.zjuhg2k.mvc;
/*
* 祝福zjuhg2k的所有XDJM
*
* AJF agile java framework
*
* version 0.1 20060617
*
* 杜 刚
* dugang
* giscat
*
* qq 53732908 mail giscat@163.com
* 浙江东阳三单 1982.10.13
* 简单务实自由快乐
* 头号国产偶像 毛泽东，周恩来，邓小平
* 头号NBA偶像 tim duncan
* 头号足球偶像 罗那尔多
*/
import java.util.regex.*;
import java.io.*;
import java.util.*;
import java.text.*;
import java.net.*;
import java.sql.*;
import javax.servlet.http.*;
import javax.servlet.*;
import com.hoson.*;
//----------mvc  control
//--------ajf agile java framework------ 

public class AjfServlet extends HttpServlet {
//private static String ext = ".ajf";
//--------------
    public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
//response.sendRedirect(request.getContextPath());
//System.out.println("servlet");
        String action = null;
action=getAction(request);
AjfAction ajf = null;
try{
ajf = (AjfAction)(Class.forName(action).newInstance());
ajf.httpWrap(request,response);
ajf.execute();
}catch(Exception e){
//System.out.println(e);
            try{
request.setAttribute(AjfConfig.get_ajf_error_msg_key(),e);
JspUtil.forward(request,response,AjfConfig.get_ajf_error_page_url());
}catch(Exception e2){throw new IOException(e2+"");}
}
}
//----------------------
    public void doPost(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
doGet(request, response);
}
//--------------------
    public static String getAction(HttpServletRequest req){
String s = null;
s = req.getServletPath();
int pos1 = 0;
int pos2 = 0;
pos1=s.lastIndexOf("/");
pos2=s.lastIndexOf(".");
s=s.substring(pos1+1,pos2-pos1);
return s;
}
//-----------
}

2.AjfAction.java

package com.zjuhg2k.mvc;
import java.util.regex.*;
import java.io.*;
import java.util.*;
import java.text.*;
import java.net.*;
import java.sql.*;
import javax.servlet.http.*;
import javax.servlet.*;
import com.hoson.*;
//----------mvc  control
//--------ajf agile java framework------
//action extends AjfAction
//over write validate and service method

/*
* 祝福zjuhg2k的所有XDJM
*
* AJF agile java framework
*
* version 0.1 20060617
*
*
* dugang
* giscat
* qq 53732908 mail giscat@163.com
* 浙江东阳三单 1982.10.13
* 简单务实自由快乐
* 头号国产偶像 毛泽东，周恩来，邓小平
* 头号NBA偶像 tim duncan
* 头号足球偶像 罗那尔多
*/
public class AjfAction {
private HttpServletRequest req = null;
private ServletResponse res = null;
private HttpSession session = null;
private String action = null;
private String op = null;
//Map model = new HashMap();//model ,data container
    Properties httpProp = null;//request prop
    Map httpMap = null;//request map
//List keyList = new ArrayList();

public void httpWrap(HttpServletRequest req,
ServletResponse res)throws Exception{
this.req = req;
this.res = res;
this.session = req.getSession();
this.httpProp = JspUtil.getReqProp(req);
this.op=req.getParameter("op");
}
//--------------
    public void execute()
throws Exception{
String url = null;
try{
url = validate();
if(!StringUtil.isempty(url)) {
forward(url);
}
url = service();
//System.out.println(url);
        if(!StringUtil.isempty(url)) {
forward(url);
}
}catch(Exception e){
add(AjfConfig.get_ajf_error_msg_key(),e);
forward(AjfConfig.get_ajf_error_page_url());
}
}
//------------
//--------logic/biz/service method here-----
    public String service()
throws Exception{
//return view url
        return null;
}
//----------
//--------server side validate here---
   public String validate()
throws Exception{
//return view url,
//  /common/validate_error.jsp
        return null;
}
//------------------
   public void forward(String url)
throws Exception{
prop2model();
//JspUtil.forward(req,res,url);
       req.getRequestDispatcher(url).forward(req,res);
}
//------------
//-----put http Prop into model map
//------
   private void prop2model(){
Enumeration e = null;
String key = null;
String v = null;
for(e = httpProp.propertyNames(); e.hasMoreElements();)
{
key = (String)e.nextElement();
v=  httpProp.getProperty(key);
add(key,v);
}
}
//----------put data into model---
   public void add(String key,Object obj){
//keyList.add(key);
//model.put(key,obj);
       req.setAttribute(key,obj);
}
//----------------
}

3.AjfView.java

package com.zjuhg2k.mvc;
import java.util.regex.*;
import java.io.*;
import java.util.*;
import java.text.*;
import java.net.*;
import java.sql.*;
import javax.servlet.http.*;
import javax.servlet.*;
public class AjfView{
//    -----------
    public static String get(HttpServletRequest req,String key){
Object v = null;
v=req.getAttribute(key);
if(v==null){return "";}
return v+"";
}
//-------------

}

4. Ajfconfig.java

package com.zjuhg2k.mvc;
public class AjfConfig{
private AjfConfig(){}
private static String ajf_error_page_url = "/common/ajf_error.jsp";
private static String ajf_error_msg_key = "ajf_error_msg";
public static String get_ajf_error_page_url(){
return ajf_error_page_url;
}
public static String get_ajf_error_msg_key(){
return ajf_error_msg_key;
}
}

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