Basic Principles of Struts1.x and implementation of the registration module, basic principles of struts1.x

Source: Internet
Author: User

Basic Principles of Struts1.x and implementation of the registration module, basic principles of struts1.x

1. Write JavaBean: User, which must inherit from the ActionForm class

1 package myuser; 2 3 import org. apache. struts. action. actionForm; 4 5 public class User extends ActionForm {6 7 // without this eclipse warning 8 private static final long serialVersionUID = 5599822869891501922L; 9 10 private Integer id; 11 12 private String userName; 13 14 private String pwd; 15 16 public Integer getId () {17 return id; 18} 19 20 public void setId (Integer id) {21 this. id = id; 22} 23 24 public String getUserName () {25 return userName; 26} 27 28 public void setUserName (String userName) {29 this. userName = userName; 30} 31 32 public String getPwd () {33 return pwd; 34} 35 36 public void setPwd (String pwd) {37 this. pwd = pwd; 38} 39}


2. register the User's object user in the struts-config.xml

FormBean concept, as the name suggests, Form bean, Form data, in Struts1.x is received by the specialized ActionForm class, configured in the struts-config.xml

1      <form-beans>2          <form-bean name="user" type="myuser.User"/>3      </form-beans>

Some Code that has been written over and over again without any technical content is implemented by a framework, such:
User user = new User ();
GetParameter.
The role of FormBean to provide data for actions.
3. Compile the UserDao class method addUser (User user User)

1 public void addUser (User user) {2 String SQL = "insert into users (userName, pwd) values (?,?) "; 3 // get Connection 4 Connection conn = DBLib. getConn (); 5 // create database operation object 6 PreparedStatement pstmt; 7 try {8 pstmt = conn. prepareStatement (SQL); 9 pstmt. setString (1, user. getUserName (); 10 pstmt. setString (2, user. getPwd (); 11 // perform database operations 12 pstmt.exe cute (); 13 pstmt. close (); 14} catch (SQLException e) {15 e. printStackTrace (); 16} finally {17 try {18 // close the database connection 19 conn. close (); 20} catch (SQLException e) {21 e. printStackTrace (); 22} 23} 24 25}


4. Write AddUserAction, call the addUser method in the UserDAO class, and add users. This class must inherit from Action.

1 package action; 2 3 import javax. servlet. http. httpServletRequest; 4 import javax. servlet. http. httpServletResponse; 5 6 import org. apache. struts. action. action; 7 import org. apache. struts. action. actionForm; 8 import org. apache. struts. action. actionForward; 9 import org. apache. struts. action. actionMapping; 10 11 import dao. userDAO; 12 import myuser. user; 13 14 public class AddUserAction extends Action {15 16 public ActionForward execute (ActionMapping mapping, ActionForm form, HttpServletRequest request, 17 HttpServletResponse response) throws Exception {18 User user = (User) form; 19 UserDAO dao = new UserDAO (); 20 dao. addUser (user); 21 return mapping. findForward ("list"); // jump to userlist. jsp page 22} 23 24}


5. Configure AddUserAction, path, name, scope, and forward. After successful addition, go to userlist. jsp.

 1 <?xml version="1.0" encoding="UTF-8"?> 2  3  <!DOCTYPE struts-config PUBLIC 4      "-//Apache Software Foundation//DTD Struts Configuration 1.3//EN" 5      "http://struts.apache.org/dtds/struts-config_1_3.dtd"> 6  <struts-config> 7      <form-beans> 8          <form-bean name="user" type="myuser.User"/> 9      </form-beans>10      11      <action-mappings>12          <action path="/addUser" type="action.AddUserAction" name="user">13              <forward name="list" path="/userlist.jsp" />14          </action>15      </action-mappings>16  </struts-config>

Configuration instructions:

Form-beans: used to place multiple formbeans

From-bean: A single formbean

| Name: from-bean name, used for reference of the following action tag

| Type: the corresponding class, which must inherit the ActionForm

Action-mappings: used to place multiple actions

Action: A single action

| Path: the path name filtered by *. do (generally, this depends on the web. xml url-pattern configuration). "/" must be added "/"

| Type: corresponding class, which must inherit Action (or its subclass, which will be shown in the following example)

| Name: form-bean in form-beans

| Scope: the valid range of the formbean. two values: request and session.

| Attribute: The name of formbean in the valid range. If this attribute is not set, the default value is name. Generally, this attribute is not required.

Forward: the page to jump to after the action is processed.

| Name: used for mapping. findForward (name) in action

| Path: Page path. You must add "/" before "/"

5. JSP page code

1 <% @ page language = "java" contentType = "text/html; charset = UTF-8" 2 pageEncoding = "UTF-8" %> 3 <! DOCTYPE html PUBLIC "-// W3C // dtd html 4.01 Transitional // EN" http://www.w3.org/TR/html4/loose.dtd "> 4 


Code link: http://pan.baidu.com/s/1qY4PEOW extract code: gy0n

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