创建一个json的model类：

 

package com.howtodoinjava.model;

import java.io.Serializable;

import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;

@XmlAccessorType(XmlAccessType.NONE)
@XmlRootElement(name = "user")
public class User implements Serializable {

    private static final long serialVersionUID = 1L;

    @XmlAttribute(name = "id")
    private int id;

    @XmlElement(name = "firstName")
    private String firstName;

    @XmlElement(name = "lastName")
    private String lastName;

    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = 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;
    }
}

2、创建一个服务器回调类：

 

UserManagementModule.java

 

package com.howtodoinjava.service;

import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.core.Response;

import com.howtodoinjava.model.User;

@Path("/user-management")
public class UserManagementModule
{
    @GET
    @Path("/users/{id}")
    @Produces("application/json")
    public Response getUserById(@PathParam("id") Integer id)
    {
        User user = new User();
        user.setId(id);
        user.setFirstName("Lokesh");
        user.setLastName("Gupta");
        return Response.status(200).entity(user).build();
    }
}

3、应用测试