Practical for beginners: several methods for transferring jsp data to action in struts2

Practical for beginners: several methods for transferring jsp data to action in struts2

 

First give the struts. xml code:

 
      
   
    {1}_{2}.jsp
     
   
    User_toLogin.jsp
     
  
 

Method 1:

 

Import com. opensymphony. xwork2.ActionSupport;/*** Method 1: directly write attributes in the action, and then write the set and get Methods * 1. add an attribute in Action. The attribute name must correspond to the attribute name on jsp * 2. add the corresponding set method **/public class UserAction extends ActionSupport {private String name; private String pass; public String getName () {return name;} public void setName (String name) {this. name = name;} public String getPass () {return pass;} public void setPass (String pass) {this. pass = pass;} public String doLogin () {String forward = input; // System. out. println (name ++ pass); if (wepull. equalsIgnoreCase (name) & 123. login signorecase (pass) {return SUCCESS; // logon successful, return SUCCESS page} else {return forward; // Logon Failed, return logon again} public String toLogin () {return SUCCESS; // enter the logon page }}

 

Bytes ------------------------------------------------------------------------------------------------------------------------------

User_toLogin.jsp page:

 

 

######################################## ##################################

Method 2:

 

Import com. opensymphony. xwork2.ActionSupport;/*** Method 2: encapsulate attributes in dto, and use the dto name when passing values. attribute * 1. add an attribute in Action. The attribute name must correspond to the attribute name on jsp * 2. add the corresponding set method **/public class UserAction extends ActionSupport {private UserDTO user; public UserDTO getUser () {return user;} public void setUser (UserDTO user) {this. user = user;} public String doLogin () {String forward = input; // System. out. println (user. getName () ++ user. getPass (); if (wepull. equalsIgnoreCase (user. getName () & 123. equalsIgnoreCase (user. getPass () {return SUCCESS;} else {return forward;} public String toLogin () {return SUCCESS;} login UserDTO. java code public class UserDTO {private String id; private String name; private String pass; public String getId () {return id;} public void setId (String id) {this. id = id;} public String getName () {return name;} public void setName (String name) {this. name = name;} public String getPass () {return pass;} public void setPass (String pass) {this. pass = pass ;}}

 

Bytes ------------------------------------------------------------------------------------------------------------------------------

User_toLogin.jsp page:

 

 

######################################## ##################################

Method 3:

 

Import com. opensymphony. xwork2.ActionSupport; import com. opensymphony. xwork2.ModelDriven;/*** method 3: Implement ModelDriven * to implement the ModelDriven interface **/public class UserAction extends ActionSupport implements ModelDriven
 
  
{Private UserDTO user; public UserDTO getUser () {return user;} public void setUser (UserDTO user) {this. user = user;} public String doLogin () {String forward = input; // System. out. println (user. getName () ++ user. getPass (); if (wepull. equalsIgnoreCase (user. getName () & 123. equalsIgnoreCase (user. getPass () {return SUCCESS;} else {return forward;} public String toLogin () {return SUCCESS;} public UserDTO getModel () {if (user = null) {user = new UserDTO ();} return user ;}}
 

 

Bytes ------------------------------------------------------------------------------------------------------------------------------

User_toLogin.jsp page:

 

 

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In addition, we will introduce a method for passing parameters through HttpServletRequest request.

 

Import javax. servlet. http. httpServletRequest; import javax. servlet. http. httpSession; import org. apache. struts2.ServletActionContext; import com. opensymphony. xwork2.ActionSupport; import com. opensymphony. xwork2.ModelDriven;/*** method of obtaining request Parameters * HttpServletRequest request parameter passing method **/public class UserAction extends ActionSupport {public String doLogin () {// obtain the request object HttpServletRequest request = ServletActionContext. getRequest (); // get the session object // HttpSession session = request. getSession (); String name = request. getParameter (name); String pass = request. getParameter (pass); String forward = input; if (wepull. equalsIgnoreCase (name) & 123. inclusignorecase (pass) {return SUCCESS;} else {return forward;} public String toLogin () {return SUCCESS ;}}

 

DTO and ModelDriven are the most common features in development.