xstream 对象和json的相互转化

package com.wa.spring.chapter14.demo;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;

import com.thoughtworks.xstream.XStream;
import com.thoughtworks.xstream.io.json.JettisonMappedXmlDriver;
import com.thoughtworks.xstream.io.json.JsonHierarchicalStreamDriver;
import com.wa.spring.chapter14.model.User;
/**
 * 对象和json的相互转化
 * @author Administrator
 *
 */
public class SimpleJsonExample {
    
    private static XStream xStream;
    
    public static User getUser() throws ParseException{
        User user = new User();
        user.setId(12);
        user.setUsername("东方不败");
        user.setLastLoginDate(new Date());
        user.setPassword("123456");
        user.setRegisterDate(new SimpleDateFormat("yyyy-MM-dd").parse("2010-10-21"));
        user.setLastLoginIp("192.189.0.102");
        return user;
    }
    /**
     * 连续的没有分隔符的json字符串
     * @throws Exception
     * 
     * 一长串字符串
     * {"user":
     *  {
     * "id":12,
     * "username":"东方不败",
     * "password":123456,
     * "registerDate":"2010-10-20 16:00:00.0 UTC",
     * "lastLoginDate":"2014-11-08 12:00:20.506 UTC",
     * "lastLoginIp":"192.189.0.102"
     *  }
     * }
     */
    public static void ObjectToJSON() throws Exception{
        User user = getUser();
        FileOutputStream out = new FileOutputStream
                (new File("D:\\workspace\\spring\\src\\com\\wa\\spring\\chapter14\\model\\user-json.json"));
        
        xStream= new XStream(new JettisonMappedXmlDriver());
        //为类设置别名
        xStream.alias("user", User.class);
        xStream.setMode(XStream.NO_REFERENCES);
        xStream.toXML(user, out);
        
    }
    /**
     * 直接生成格式良好的json字符串
     * {"user": {
  "id": 12,
  "username": "东方不败",
  "password": "123456",
  "registerDate": "2010-10-20 16:00:00.0 UTC",
  "lastLoginDate": "2014-11-08 12:05:08.15 UTC",
  "lastLoginIp": "192.189.0.102"
}}
     * @throws Exception
     */
    public static void ObjectToGoodFormat() throws Exception{
        
        User user = getUser();
        FileOutputStream out = new FileOutputStream
                (new File("D:\\workspace\\spring\\src\\com\\wa\\spring\\chapter14\\model\\user-format-json.json"));
        /**
         *   Hierarchical
         *   
         *  英 [haɪə'rɑːkɪk(ə)l]   美 [,haɪə'rɑrkɪkl]   全球发音 跟读 口语练习
adj. 分层的；等级体系的
         */
        xStream= new XStream(new JsonHierarchicalStreamDriver());
        //为类设置别名
        xStream.alias("user", User.class);
        xStream.setMode(XStream.NO_REFERENCES);
        xStream.toXML(user, out);
        
    }
    
    public static void JSON2Object() throws Exception{
        
        FileInputStream in= new FileInputStream
                (new File("D:\\workspace\\spring\\src\\com\\wa\\spring\\chapter14\\model\\user-format-json.json"));
        /**
         *  JsonHierarchicalStreamDriver不能将json转化为对象
         *  java.lang.UnsupportedOperationException:
         *   The JsonHierarchicalStreamDriver can only write JSON
         */
        //xStream= new XStream(new JsonHierarchicalStreamDriver());
        
        xStream= new XStream(new JettisonMappedXmlDriver());
        xStream.alias("user", User.class);
        User user = (User)xStream.fromXML(in);
        System.out.println(user);
    }
    
    public static void main(String[] args) throws Exception{
        //ObjectToJSON();
        // ObjectToGoodFormat();
        JSON2Object();
    }

}