<ROOT>

<EMPLOYEE>

<id></id>

<nm></nm>

….

</EMPLOYEE>

<EMPLOYEE>

<id></id>

<nm></nm>

….

</EMPLOYEE>

</ROOT>

package test;

import java.util.ArrayList;
import java.util.List;

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

@XmlRootElement(name = "ROOT")
@XmlAccessorType(XmlAccessType.FIELD)
public class Root {
   
    @XmlElement(name="EMPLOYEE")
    private List<Employee> employees;

    public Root() {
        employees = new ArrayList<Employee>();
    }

    public List<Employee> getEmployees() {
        return employees;
    }

    public void setEmployees(List<Employee> employees) {
        this.employees = employees;
    }

}

package test;

public class Employee {

private String id;
private String nm;

….

… // set, get

}

public class XEmployee {

    private static List<String> employeeList;
   
    public static List<String> getEmployeeList() {
        return employeeList;
    }
   
    static {
        employeeList = new ArrayList<String>();

        employeeList.add("aaa");
         employeeList.add("bbb");
         employeeList.add("ccc");

…

    }
}

package test;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;
import java.io.Writer;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;

public class CheckEmp {
    public static final boolean isSaved = false;
    public static final String URL = "http://xxxxxxxx";
    public static JAXBContext jaxbContext;
    static {
        try {
            jaxbContext = JAXBContext
                    .newInstance(new Class[] { test.Root.class });
        } catch (JAXBException e) {
            e.printStackTrace();
        }
    }

        public static void main(String[] args) throws Exception {

        // connect url
        BufferedReader reader = connectURL();

        // save file
        if (isSaved) {
            saveFile(reader);
        }
       

        // get object
        Root root = getRoot(reader);

        // find
        for (String retiredEmpID : XEmployee.getEmployeeList()) {
            boolean found = false;
            for(Employee emp : root.getEmployees()) {
                if (emp.getID().trim().equalsIgnoreCase(retiredEmpID)) {
                    found = true;
                }
            }
            if (found == false) {
                System.out.println(retiredEmpID);
            }
        }
    }

    private static Root getRoot(BufferedReader reader) throws JAXBException {
        Root root = (Root) jaxbContext.createUnmarshaller().unmarshal(reader);
        return root;
    }

    private static BufferedReader connectURL() throws IOException,
            ClientProtocolException, UnsupportedEncodingException {

        HttpGet httpget = new HttpGet(URL);
        HttpClient httpclient = new DefaultHttpClient();
        httpclient.getParams().setParameter("http.socket.timeout", 999000);
       
        HttpResponse response = httpclient.execute(httpget);
        HttpEntity entity = response.getEntity();
        if (entity == null) {
            throw new RuntimeException("url error");
        }
        InputStream instream = entity.getContent();
        BufferedReader reader = new BufferedReader(new InputStreamReader(instream, "utf-8"));
        return reader;
    }

    private static void saveFile(BufferedReader reader) throws IOException {
        Writer fstream = new BufferedWriter(new OutputStreamWriter(new FileOutputStream("aaa.txt"), "utf-8"));
        BufferedWriter out = new BufferedWriter(fstream);
        char[] a = new char[1024] ;
        while (reader.read(a) > 0) {
            out.write(a);
        }
        out.flush();
        System.out.println("File created successfully.");
    }

}