Passing value from jsp to Action for java.util.Set

Question

I want to set values for Set elements of login from JSP .

JSP page:

  <form action="Registered" method="post"> 
        <div class="form-group">
            <label>Company Name</label>
            <s:textfield name="name" value="%{name}" id="name"/>
        </div>
        <div class="form-group">
            <label>Address</label>
            <s:textarea name="address" value="%{address}" id="address"/>
        </div>
        <div class="form-group">
            <label>User Name</label>
            <s:textfield name="logins[0].userName" value="%{logins[0].userName}" id="userName"/>
        </div>
        <div class="form-group">
            <label>User Id</label>
            <s:textfield name="logins[0].userId" value="%{logins[0].userId}" id="userId"/>
        </div>
        <div class="form-group">
            <label>Mail Id</label>
            <s:textfield name="logins[0].userMailid" value="%{logins[0].userMailid}" id="userMailid"/>
        </div>

Pojo Classes:

public class Client  implements java.io.Serializable {
  private Set logins = new HashSet(0);
  //getter and setter
 }



 public class Login implements java.io.Serializable {

    private Long id;
    private Client client;
    private String userId;
    private String userName;
    private String userMailid;
 }

Action Class:

public String register() {
        Client cl = new Client();
        System.out.println(cl.getName() + " " + cl.getAddress());
  }

I want to set values of set in to my Action class for Client and Login.

How to do this?

you want to get value from textfield or you want set default value in text field? — Jimmysnn, Jul 18 '14 at 11:27
User will fill form When form submitted it should assing in client and login fields — xrcwrn, Jul 18 '14 at 11:29
@AleksandrM http://stackoverflow.com/a/24191304/876739 Working for set. How can I do that with this code — xrcwrn, Jul 18 '14 at 12:05
What is the requirement to use `Set`? A `List` could be a reasonable replacement. — Roman C, Jul 18 '14 at 15:30
@RomanC While using Set it is better with Hibernate( I think). It create problem with list during fetch. If we use multiple list to fetch data it creates problem. So I would like to use Set insted of list — xrcwrn, Jul 19 '14 at 03:26
@xrcwrn Do you have arguments against a `Set`? If you have some unknown problems with it explains nothing. You can elaborate on why you prefer sets over lists. — Roman C, Jul 19 '14 at 06:51
@RomanC Ok Not good reasones but still i want to use `Set` because I want to use it. http://stackoverflow.com/a/24191304/876739 shows how to do that. I am not able to use according to my need. could you please tell me how can I modify my code so it should work — xrcwrn, Jul 20 '14 at 10:28
@xrcwrn I have given you a ways to do that, see my [answer](http://stackoverflow.com/a/24849726/573032). — Roman C, Jul 20 '14 at 10:58

Jimmysnn · Answer 1 · 2014-07-18T12:22:18.773

You can use a submit button like this:

 <form action="Registered" method="post"> 
            <div class="form-group">
                <label>Company Name</label>
                <s:textfield name="name" value="%{name}" id="name"/>
            </div>
            <div class="form-group">
                <label>Address</label>
                <s:textarea name="address" value="%{address}" id="address"/>
            </div>
            <div class="form-group">
                <label>User Name</label>
                <s:textfield name="logins[0].userName" value="%{logins[0].userName}" id="userName"/>
            </div>
            <div class="form-group">
                <label>User Id</label>
                <s:textfield name="logins[0].userId" value="%{logins[0].userId}" id="userId"/>
            </div>
            <div class="form-group">
                <label>Mail Id</label>
                <s:textfield name="logins[0].userMailid" value="%{logins[0].userMailid}" id="userMailid"/>
            </div>
          <input type="submit" value="Submit">
        </form>

EDIT

A nice tutorial

After make properties file like:

#Global messages
name= name
submit = Submit

I believe you has made Registered.jsp.

An you can run your project!

I am using struts2 where `String name = request.getParameter("name");` not necessary to get value from jsp — xrcwrn, Jul 18 '14 at 11:54
ok. I didn't know. so you solve your problem or I edit my answer? — Jimmysnn, Jul 18 '14 at 12:00

Roman C · Answer 2 · 2014-07-20T10:55:06.537

To bind fildes to Set you should put annotations on this property

public class Client  implements java.io.Serializable {

  @Element(value = Login.class)
  @Key(value = Long.class)
  @KeyProperty(value = "id") 
  @CreateIfNull(value = true)
  private Set logins = new HashSet(0);
  //getter and setter

  //now you need a property for login id, it should be initialized before JSP is populated
  private Long loginId;
  //getter and setter
}

now binding to the fields of the JSP change to

<s:textfield name="logins(%{loginId}).userName" id="userName"/>

the same for other fields that are bound to a set.

If you are using iterator tag to iterate through a set and you have an instance of Login pushed on top of the value stack then you can get its id instead of using loginId.

Passing value from jsp to Action for java.util.Set

2 Answers2

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