Strut2 ví dụ căn bản


 

Basic exercise:

Using Strut 2 to develop login application.

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If login fail

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If login successful

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1. Create Java web application base on Strut2 framework as figure below.

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2. Create some file as structure

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3. Open struts.xml and modify as

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4. Open appResources: create some keys

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5. Open Login class and add new code as

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6. Generate getter/setter for two field above

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7. Next, design login page

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8. Next, index.jsp page

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9. Next, error.jsp page

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10. Now, deploy and run login.jsp page

Strut2-Validation

Using Strut validate input data

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If input data invalid

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If input data is valid

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1. Design customer.jsp as

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2. Add some new key to appResources

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3. Assign Customer action in struts.xml

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4. Add new class with name “Customer” into codes package

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5. Generate setter and getter for 4 fields

6. Add new file “Customer-validation.xml” into package

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Now, re-deploy and run

Using annotations

All action class must be inside actions package

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Strut Controller now change to org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter

1 <filter> 2 <filter-name>struts2</filter-name> 3 <filter-class> 4 org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter 5 </filter-class> 6 <init-param> 7 <param-name>actionPackages</param-name> 8 <param-value>codes</param-value> 9 </init-param> 10 </filter> 11 <filter-mapping> 12 <filter-name>struts2</filter-name> 13 <url-pattern>/*</url-pattern> 14 </filter-mapping>

If your Action extend from ActionSupport, then your Action class name has no rule required.

Ex: Login action beloved

Otherwise, action class name must end with Action string

Ex: account action

1 @Namespace("/") 2 @ResultPath(value = "/") 3 @Results({ 4 @Result(name = "success", location = "index.jsp"), 5 @Result(name = "error", location = "error.jsp")} 6 ) 7 public class accountAction { 8 @Action(value="account") 9 public String execute() throws Exception { 10 if ("nvmit".equals(getName())) { 11 return SUCCESS; 12 } else { 13 return ERROR; 14 } 15 } 16 private String name =""; 17 public String getName() { 18 return name; 19 } 20 public void setName(String name) { 21 this.name = name; 22 } 23 }

@Namespace Annotation in Struts 2

@Namespace is used at class level or package level. This helps to change the namespace for action class. While accessing or calling action class, it hides package structure. When namespace is applied at package level, all the action of that package gets that namespace as default.

1 @Results({ 2 @Result(name = "SUCCESS", location = "/user/index.jsp"), 3 @Result(name = "ERROR", location = "/user/error.jsp") 4 }) 5 @Namespaces( 6 @Namespace("/user") 7 ) 8 public class Login extends ActionSupport{ 9 @Action(value = "/user/login") 10 public String execute() throws Exception { 11 if ("nvmit".equals(getName()) && "nvmit".equals(getPwd())) { 12 return "SUCCESS"; 13 } else { 14 return "ERROR"; 15 } 16 } 17 18 //Java Bean to hold the form parameters 19 private String name; 20 private String pwd; 21 22 public String getName() { 23 return name; 24 } 25 26 public void setName(String name) { 27 this.name = name; 28 } 29 30 public String getPwd() { 31 return pwd; 32 } 33 34 public void setPwd(String pwd) { 35 this.pwd = pwd; 36 } 37 } 38

The above class can be accessed by @Namespace + @Action that is /user/form
http://localhost:8080/Struts2Demo-1/user/form

Create Project with beloved structure

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Project Structure

user/login.jsp

1 <%@ taglib uri="/struts-tags" prefix="s"%> 2 <html> 3 <head> 4 <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> 5 <title>Login Page</title> 6 </head> 7 <body> 8 <h3>Welcome User, please login below</h3> 9 <s:form action="/user/login"> 10 <s:textfield name="name" label="User Name"></s:textfield> 11 <s:textfield name="pwd" label="Password" type="password"></s:textfield> 12 <s:submit value="Login"></s:submit> 13 </s:form> 14 </body> 15 </html>

user/index.jsp

1 <%@page contentType="text/html" pageEncoding="UTF-8"%> 2 <%@taglib prefix="s" uri="/struts-tags" %> 3 <!DOCTYPE html> 4 <html> 5 <head> 6 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 7 <title>JSP Page</title> 8 </head> 9 <body> 10 <h1>Hello <s:property value="name" /></h1> 11 </body> 12 </html>

account.jsp

1 <%@page contentType="text/html" pageEncoding="UTF-8"%> 2 <%@taglib prefix="s" uri="/struts-tags" %> 3 <!DOCTYPE html> 4 <html> 5 <head> 6 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 7 <title>JSP Page</title> 8 </head> 9 <body> 10 <h1>Hello <s:property value="name" /></h1> 11 </body> 12 </html> 13

Index.jsp same above

 

Download source code ===> here

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