JSON格式解析

此段代码仅仅用来验证解析json的过程

 

/**
 *-----------------------------------------------------------------------------
 * @ Copyright(c) 2006~2012  d. All Rights Reserved.
 *-----------------------------------------------------------------------------
 * FILE  NAME             : TestJSON.java
 * DESCRIPTION            :
 * PRINCIPAL AUTHOR       : Project Team
 * SYSTEM NAME            : 1222
 * MODULE NAME            : xxxx
 * LANGUAGE               : Java
 * DATE OF FIRST RELEASE  :
 *-----------------------------------------------------------------------------
 * @ Created on 2010-11-2
 * @ Release 1.0.0.0
 * @ Version 1.0
 * -----------------------------------------------------------------------------------
 * Date	       Author	      Version     Description
 * -----------------------------------------------------------------------------------
 * 2010-11-2    xxxxxxx   1.0 	  Initial Create
 * -----------------------------------------------------------------------------------
 */
package json;

import java.util.Set;

import net.sf.json.JSONArray;
import net.sf.json.JSONObject;

public class TestJSON
{

    /**
     * @param args
     */
    public static void main(String[] args)
    {
        /**
         * JSON消息体,"jsonText"标签可能存在，也可能不存在
         * {jsonText:{userName:[{liu:\"maomao\"},{hu:\"mimi\"}],sex:\"male\",age:\"23\"}}
        */

        String textJson = args[0];

        try
        {
            //通过JSONObject类的fromObject方法解析json格式的消息成JSONObject对象
            JSONObject jsonObject = JSONObject.fromObject(textJson);

            //如果消息体中含有jsonText,需要根据标签取到后面的消息：{userName:\"nihao\",sex:\"male\",age:\"23\"}
            if (null != jsonObject.get("jsonText"))
            {
                jsonObject = jsonObject.getJSONObject("jsonText");
            }

            //判断userName标签是否存在
            if (jsonObject.containsKey("userName"))
            {
                //如果标签存在，进一步判断userName是否为数组
                if (jsonObject.get("userName").toString().contains("[")
                        && jsonObject.get("userName").toString().contains("]"))
                {
                    JSONArray jsonArray = jsonObject.getJSONArray("userName");

                    //遍历json中的数组
                    for (int i = 0; i < jsonArray.size(); i++)
                    {
                        //此时tmp封装的消息例如：{"liu":"maomao"}
                        JSONObject tmp = jsonArray.getJSONObject(i);

                        Set<String> keySet = tmp.keySet();

                        //通过判断set的大小，观察数组元素是否只封装了一条信息。特例情况比如：{"liu":"maomao","wang":"word"}
                        if (keySet.size() > 1)
                        {
                            System.out.println("fault");
                        }

                        for (String key : keySet)
                        {
                            if ("liu".equals(key))
                            {
                                //取出数组中key对应的值
                                System.out.println(tmp.getString("liu"));
                            }

                            if ("hu".equals(key))
                            {
                                System.out.println(tmp.getString("hu"));
                            }
                        }
                    }
                }
            }
        }
        catch (Exception e)
        {
            e.printStackTrace();
        }

    }

}