SpringMVC Form Tag Lib Radio + Radios

For binding data on a jsp page to a form, one of the easiest ways is using spring form tag.

In this article, I will show you how to bind form data by using:

• <form:radiobutton>
• <form:radiobuttons>

1. Form Bean

public class User {

     // a radio
 private String sex;
 
 // radios
 private String skin;
....
}

2. Form Tags

To generate a radio button, we use this syntax:

<form:radiobutton 
 path="sex" 
 value="M"
/> 

• path="sex" means the selected radio value binds to sex attribute
• value="M" the label of this radio

To generate a list of radio button, we use this syntax:

<form:radiobuttons 
    path="skin" 
    items="${lstSkin}" 
/>

• path="skin" means the selected radio value binds to sex attribute
• items="${lstSkin}" means the radio value and radio lable are stored in lstSkin

4. In Controller

We initialize the item list in GET method

@RequestMapping(value = "/modifyUser", method = RequestMethod.GET)
public ModelAndView modifyUser() {

 Map<String, String> lstSkin = new HashMap<String, String>();
 lstSkin.put("1", "White");
 lstSkin.put("2", "Black");
 lstSkin.put("3", "Brown");
 lstSkin.put("4", "Orange");
  
 ModelAndView modelView = new ModelAndView("modifyUser");
 modelView.addObject("lstSkin", lstSkin);
 modelView.addObject("user", this.user);
  
 return modelView;
} 

As you see, the lstSkin is a Map, the key of Map is radio value and the value of Map is radio label

Note
The order of items is not guaranteed in JSP

References:

• http://static.springsource.org/spring/docs/3.1.x/spring-framework-reference/html/view.html#view-jsp-formtaglib

Source code:

• For the demonstration, please download source code from HERE
• My repository on Github