How to map json payload to model bean in struts2 - struts2

Question

Is there any way to map json payload to Model bean.? If possible, please provide me an example.
Following are the classes I am using.
package com.sample;
import java.io.Serializable;
public class Employee implements Serializable{
private String firstName;
private String lastName;
private int id;
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
#Override
public String toString() {
StringBuilder builder = new StringBuilder();
builder.append("Employee [firstName=").append(firstName)
.append(", lastName=").append(lastName).append(", id=")
.append(id).append("]");
return builder.toString();
}
}
Following is my action class.
package com.sample.controller;
import com.opensymphony.xwork2.ModelDriven;
import com.sample.Employee;
public class EmployeeController implements ModelDriven<Employee> {
private String name = "Hari krishna";
Employee emp = new Employee();
public String addEmployee() {
System.out.println(emp);
return "success";
}
#Override
public Employee getModel() {
return emp;
}
}
Following is my struts.xml
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
<package name="default" extends="json-default">
<interceptors>
<interceptor-stack name="jsonStack">
<interceptor-ref name="json">
<param name="enableSMD">true</param>
</interceptor-ref>
</interceptor-stack>
</interceptors>
<action name="addEmployee" class = "com.sample.controller.EmployeeController" method = "addEmployee">
<interceptor-ref name="jsonStack"></interceptor-ref>
<result type="json" />
</action>
</package>
</struts>
When I call the action "addEmployee", with json data "{"firstName":"Hari","id":123,"lastName":"assds"}" I am getting following response. I set content type to text/json.
{
"model": {
"firstName": null
"id": 0
"lastName": null
}-
}
I am posting data using Advanced Rest Client.

Answer 1

when you send the json data from client to server, send them as string and in action class create a normal String variable to receive and hold the json's string.
Then, you can manually populate your bean from string using json parser,
or use a lib like google gson that has a build in features for this purposes.
Google Gson is a Java serialization/deserialization library that can convert Java Objects into JSON and back.
You can create your own struts Interceptor to wrap this process or implements it directly inside your action class.