Library learning log (...) ）

Add Library in BuildPath, is right-click Project->properties->java buildpath->libraries

Then click Add Library is added library according to the prompts to add,

Add a jar to an existing library, add an internal click Add jar, add an external click Add External JARS;

The life cycle of form forms in a Web application:

For example, use the login form for login:

 login.jsp:  <form name= " form1   method="  post   action="  manager.do?action=login  ; 

<servlet>    <servlet-name>action</servlet-name>    <servlet-class> org.apache.struts.action.actionservlet</servlet-class>    <init-param>      <param-name> config</param-name>      <param-value>/WEB-INF/struts-config.xml</param-value>    </ init-param>    <init-param>      <param-name>debug</param-name>      <param-value>3 </param-value>    </init-param>    <init-param>      <param-name>detail</ param-name>      <param-value>3</param-value>    </init-param>    <load-on-startup >0</load-on-startup>  </servlet>  <servlet-mapping>    <servlet-name> action</servlet-name>    <url-pattern>*.do</url-pattern>  </servlet-mapping>

Above is web. xml

Structs-config.xml:

<action name= "Managerform" path= "/manager" scope= "Request" type= "Com.action.Manager" validate= "true" >      <forward name= "Managerquery" path= "/manager.jsp"/>      <forward name= "Managerloginok" path= "/main.jsp"/ >      <forward name= "Manageradd" path= "/manager_ok.jsp?para=1"/> <forward name=      " Managerquerymodify "path="/manager_modify.jsp "/>

Manager.java:

Public Actionforward Execute (actionmapping mapping, actionform form,httpservletrequest request, HttpServletResponse Response) {String action = request.getparameter ("action"); System.out.println ("Gets the query string:" + action); if (action = = NULL | | "". Equals (Action)) {/* If there is no action action */return mapping.findforward ("error");} else if ("Login". Equals (Action)) {/* If it is a processing administrator login */return managerlogin (mapping, form, request, response);} else if (" Manageradd. Equals (action) {return Manageradd (mapping, form, request, response);} else if ("Managerquery". Equals ( Action) {return managerquery (mapping, form, request, response),} else if ("Managermodifyquery". Equals (Action)) {return Managermodifyquery (mapping, form, request, response);} else if ("Managermodify". Equals (Action)) {return managermodify (mapping, form, request, response);} else if ("Managerdel" . Equals (Action) {return Managerdel (mapping, form, request, response),} else if ("Querypwd". Equals (Action)) {return Pwdquery (mapping, form, request, response);} else if ("Modifypwd". Equals (Action)) {return modifypwd (mapping, form, request, response);} Request.setattribute ("Error", "Operation failed!") "); return Mapping.findforward (" error ");} Public Actionforward Managerlogin (actionmapping mapping, actionform form,httpservletrequest request, HttpServletResponse response) {Managerform Managerform = (managerform) form;managerform.setname (ManagerForm.getName ( ), Managerform.setpwd (Managerform.getpwd ());/* Passes Formbean that have administrator information to DAO Business layer processing (querying for the presence of that administrator account and password) */int ret = Managerdao.checkmanager (Managerform); System.out.print ("Verify the value of the result ret:" + ret);/* The Business layer returns 1 for validation success */if (ret = = 1) {/* Save user Account in session */httpsession session = Request.getsession (); Session.setattribute ("Manager", Managerform.getname ());/* to the controller, jump to the landing successful page */return Mapping.findforward ("Managerloginok");} else {request.setattribute ("error", "the administrator name or password you entered is wrong!") "); return Mapping.findforward (" error ");}}

The specific processing is the above content, the transfer of form and the entire process of request.

As for the puzzling action, the content

<form name= "Form1" method= "Post" action= "Manager.do?action=login" >
You can use this picture to explain:

Library learning log (...) ）