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Using form tags in Struts 2

Struts 2 provides various tags that simplifies our development.  Here is an example to create the form using struts2 form tags. These tags are processed by struts frame work and values are mapped to coreponding domaon object automatically. The name attribute of tag is used to map the value to data holder variable at server side. 


Here, each name has been prefixed with "user" that specifies the object in action implementation. For example, The value of textfield having name "user.name" will mapped to the variable of object being referenced by user variable of action class.


<%@ taglib prefix="s" uri="/struts-tags"%>
<html>
<head>
</head>
<body>
    <s:form action="send" method="post">
        <s:textfield name="user.name" label="Full Name" title="Use text only"/>
        <s:textfield name="user.email" label="Email Id" title="Use valid emailid only"/>
        <s:textfield name="user.phone" label="Mobile Number"/>
        <s:password name="user.password" label="Password"/>
        <s:textarea name="user.address" cols="25" rows="4" label="Address"/>
        <s:checkboxlist key="Books" list="{'Java','J2EE','Servlet','JSP','Struts2'}"/>    
        <s:checkbox key="Qulification" value="y" label="Are you MCA ?" fieldValue="MCA" />
        <s:radio key="Gender" list="{'Male','Female'}"/>
        <s:select key="Job Location" list="{'Delhi','Noida','Gurgao','Channai','Kolkata','Pune'}"/>
        <s:submit/>
    </s:form>
    <s:debug/>
</body>
</html>

struts.xml has folowing contents
 Here, action name is "send" and form is submitted to this action.

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUB
    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
    "http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
    <constant name="struts.devMode" value="true" />
    <package name="default" namespace="/" extends="struts-default">
        <action name="send" class="TestAction">
            <result name="success">result1.jsp</result>
        </action>
    </package>
</struts>


As we submit this form, action object is get invoked and here is following implemetnation of action class.

public class TestAction{
    private pack.User user;
    public pack.User getUser(){
        return user;
    }
    public void setUser(pack.User user){
        this.user=user;
    }
    public String execute(){
        System.out.println(user);
        return "success";
    }
}

The data of form field is mapped to user object automatically.


package pack;
public class User{
    private String name;
    private String email;
    private int phone;
    public String getName(){
        return name;
    }
    public void setName(String name){
        this.name=name;
    }
    public String getEmail(){
        return email;
    }
    public void setEmail(String email)
        this.email=email;
    }
    public int getPhone(){
        return phone;
    }
    public void setPhone(int phone){
        this.phone=phone;
    }
    public String toString(){
        return "User [name="+name+", email="+email+",phone="+phone+"]";
    }
}

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