import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.google.gson.Gson;

import de.undercouch.bson4jackson.BsonFactory;

public class jack {
	
	public static void main(String ss[]) throws Exception
	{
		testuser t=new testuser();
		t.setId(1);
		t.setUsername("admin");
		t.setPassword("admin88888");
		
		Gson gson = new Gson();
        String str = gson.toJson(t);
	 
		FileOutputStream in = new FileOutputStream("c:/jack1.bin");
	    in.write(str.getBytes());
	    in.flush();
	    in.close();
		 
	    
		FileOutputStream baos = new FileOutputStream("c:/jack.bin");
	    ObjectMapper mapper = new ObjectMapper(new BsonFactory());
	    
	    mapper.writeValue(baos, t); 
	   
	    baos.flush();
	    baos.close();
	 
	    FileInputStream bais = new FileInputStream("c:/jack.bin");
	      
	    testuser t2 = mapper.readValue(bais, testuser.class);
	    t2.info();
	    bais.close();
		
	} 
}
 

//pojo testuser

public class testuser {
	     private int id; 
	    private String username;  
	    private String password ;
	    
	    public testuser() {
			// TODO Auto-generated constructor stub
		}
	    
	    public void setId(int id) {
			this.id = id;
		}
	    public void setPassword(String password) {
			this.password = password;
		}
	    public void setUsername(String username) {
			this.username = username;
		}
	    public int getId() {
			return id;
		}
	    public String getPassword() {
			return password;
		}
	    public String getUsername() {
			return username;
		}
	    public  void info()
	    {
	    	System.out.println("id:"+id+":"+username+":"+password);
	    }
}