Imitation STRUTS2 implementation action jump

1. Define your own Struts2.xml file first
   

<?xml version= "1.0" encoding= "UTF-8"?><struts><dg></dg> <action name= "Login" class= " Com.ming.action.LoginAction "><result name=" Success "type=" Chain ">/success.jsp</result><result Name= "Login" >/login.jsp</result></action></struts>

2. Defining Resultbean Objects

Package Com.ming.bean;public class Resultbean {private string resultname;private string Resulttype;private string Resulttext;public String Getresultname () {return resultname;} public void Setresultname (String resultname) {this.resultname = Resultname;} Public String Getresulttype () {return resulttype;} public void Setresulttype (String resulttype) {this.resulttype = Resulttype;} Public String Getresulttext () {return resulttext;} public void Setresulttext (String resulttext) {this.resulttext = Resulttext;}}

3. Defining Actionbean Objects

Package Com.ming.bean;

Import Java.util.HashMap;
Import Java.util.Map;

public class Actionbean {

Private String ActionName;
Private String Actionclz;
Private map<string,resultbean> map=new hashmap<string,resultbean> ();
Public String Getactionname () {
return actionname;
}
public void Setactionname (String actionname) {
This.actionname = ActionName;
}
Public String Getactionclz () {
return ACTIONCLZ;
}
public void Setactionclz (String actionclz) {
This.actionclz = ACTIONCLZ;
}
Public map<string, Resultbean> Getmap () {
return map;
}
public void Setmap (map<string, resultbean> Map) {
This.map = map;
}



}

4. Define a class to read an XML file

package com.ming.filter;import java.io.file;import java.util.hashmap;import  java.util.iterator;import java.util.map;import org.dom4j.document;import  org.dom4j.documentexception;import org.dom4j.element;import org.dom4j.io.saxreader;import  Com.ming.bean.actionbean;import com.ming.bean.resultbean;public class readxml {public  static map readxml (String path) {saxreader reader=new saxreader (); Map<string,actionbean> actionmap=new hashmap<string, actionbean> (); try { Document document=reader.read (New file (path)); Element strutselement=document.getrootelement (); Iterator actions=strutselement.elementiterator (); while (Actions.hasnext ()) {Actionbean actionbean=new actionbean (); Element actionelement= (Element)  actions.next (); String actionname=actionelement.attributevalue ("name"); String actionclz=actionelement.attributevalue ("Class "); Actionbean.setactionname (ActionName); Actionbean.setactionclz (ACTIONCLZ);     map <string,resultbean> resultmap=actionbean.getresultmap ();    iterator  Results=actionelement.elementiterator ();     while (Results.hasnext ()) {     resultbean resultbean=new resultbean ();     element resultelement= ( Element)  results.next ();     string resultname=resultelement.attributevalue ("Name ");     resultbean.setresultname (resultname);     string resulttype =resultelement.attributevalue ("type");     resultbean.setresulttype (ResultType);     string resulttext=resultelement.gettext ();     Resultbean.setresulttext (Resulttext);     resultmap.put (Resultname, resultbean);     }    actionmAp.put (Actionname, actionbean);}}  catch  (documentexception e)  {system.out.println ("Failed to read XML file!! "); E.printstacktrace ();} Return actionmap;}}

5. Implement the STRUTS2 core class to implement the action jump function

package com.ming.filter.core;import java.io.ioexception;import  Java.lang.reflect.invocationtargetexception;import java.util.map;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;import org.apache.commons.beanutils.beanutils;import  com.ming.bean.actionbean;import com.ming.bean.resultbean;import com.ming.filter.readxml;public  class struts2filter implements filter {@Overridepublic  void destroy ()  {}Map  actionMap; @Overridepublic  void dofilter (servletrequest arg0, servletresponse  Arg1,filterchain chain)  throws ioexception, servletexception {httpservletrequest  request =  (HttpServletRequest)  arg0; httpservletresponse response =  (httpservletresponse)  arg1;// 1  GET request Path string  path = request.getrequesturi (); SYSTEM.OUT.PRINTLN (path); Int beginindex = path.lastindexof ("/")  + 1;int endindex  = path.lastindexof ("."); Path = path.substring (Beginindex, endindex);         System.out.println (Path);// 2  finds the corresponding class in struts.xml  based on the path object object =  Actionmap.get (PATH);// 3  assigns a value to the corresponding property if  (object != null)  {actionbean actionbean  =  (Actionbean)  object; String actionclz = actionbean.getactionclz (); try {class clz = class.forname (ACTIONCLZ); Object actionobject = clz.newinstance ();//  gets all the values submitted to the filter from jsp  (storage form  k-v  Example: UserName, "Zhangsan") Map requestmap = request.getparametermap ();//  automatically completes assignment of  map to the object's corresponding property value Beanutils.populate (Actionobject, requestmap);// 4  Call the Execute Method action action =  (action)  actionObject;//  Call implementation class  execute method string  Returnresult = action.execute ();// 5  Find the return value object resultobject =  Actionbean.getresultmap (). Get (Returnresult);if  (resultobject != null)  {ResultBean  resultbean =  (Resultbean)  resultObject;// 6  in  struts.xml  corresponding jspstring  Result = resultbean.getresulttext ();// 7  jump Request.getrequestdispatcher (Result). Forward ( Request,response); return;}  else {system.out.println ("Value of result not found:"  + returnresult); Chain.dofilter (request,  response);}}  catch  (classnotfoundexception e)  {e.printstacktrace ();}  catch  (instantiationexception e)  {e.printstacktrace ();}  catch  (illegalaccessexception e)  {e.printstacktracE ();}  catch  (invocationtargetexception e)  {e.printstacktrace ();}  catch  (exception e)  {e.printstacktrace ();}}  ELSE {SYSTEM.OUT.PRINTLN ("The path does not exist:"  + path); Chain.dofilter (request, response);} Chain.dofilter (request, response);}   Execution at tomcat  startup, completion of struts configuration information initialization @overridepublic void init (FILTERCONFIG CONFIG)  throws servletexception {string path = config.getservletcontext (). GetRealPath (" Web-inf/classes/struts.xml "); Actionmap=readxml.readxml (path);}}

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Imitation STRUTS2 implementation action jump