Json工具類JsonUtil

import java.io.StringReader;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Set;

import com.anxin.ssk.util.json.ListBean;
import com.anxin.ssk.util.json.MapBean;
import com.sdicons.json.mapper.JSONMapper;
import com.sdicons.json.mapper.MapperException;
import com.sdicons.json.model.JSONArray;
import com.sdicons.json.model.JSONValue;
import com.sdicons.json.parser.JSONParser;

/**
* JSON工具類
*
*/
public class JSonUtil {

/** 
 * JAVA對象轉換成JSON字符串 
 *  
 * @param obj JAVA對象 
 * @return JSON字符串 
 * @throws MapperException 
 */  
public static String obj2Json(Object obj) throws MapperException {  
    return obj2Json(obj, false);  
}  

/** 
 * JAVA數組對象轉換成JSON字符串 
 *  
 * @param list JAVA數組對象 
 * @return JSON字符串 
 * @throws MapperException 
 */  
public static String obj2Json(List<Class<?>> list) throws MapperException {  
    if (list == null || list.size() == 0) {  
        return "{}";  
    }  
    StringBuilder jsonString = new StringBuilder();  
    for (int i = 0; i < list.size(); i++) {  
        if (i != 0) {  
            jsonString.append(",");  
        }  
        Class<?> cla = list.get(i);  
        jsonString.append(obj2Json(cla, false));  
    }  
    return jsonString.toString();  
}  

/** 
 * JAVA集合對象轉換成JSON字符串 
 *  
 * @param map JAVA集合對象 
 * @return JSON字符串 
 * @throws MapperException 
 */  
public static String obj2Json(Map<String, Class<?>> map) throws MapperException {  
    if (map == null || map.size() == 0) {  
        return "{}";  
    }  
    StringBuilder jsonString = new StringBuilder();  
    Set<String> keySet = map.keySet();  
    boolean isFirst = true;  
    for (String key : keySet) {  
        if (isFirst) {  
            isFirst = false;  
        } else {  
            jsonString.append(",");  
        }  
        Class<?> cla = map.get(key);  
        jsonString.append(obj2Json(cla, false));  
    }  
    return jsonString.toString();  
}  

/** 
 * JAVA集合對象轉換成JSON字符串 
 *  
 * @param map JAVA集合對象 
 * @return JSON字符串 
 * @throws MapperException 
 */  
@SuppressWarnings("unchecked")  
public static String map2Json(Map<?,?> map) throws MapperException {  
    MapBean mapBean = new MapBean((Map<String, Object>)map);  
    return obj2Json(mapBean);  
}  

/** 
 * JAVA數組對象轉換成JSON字符串 
 *  
 * @param list JAVA數組對象 
 * @return JSON字符串 
 * @throws MapperException 
 */  
public static String list2Json(List<?> list) throws MapperException {  
    ListBean listBean = new ListBean(list);  
    return obj2Json(listBean);  
}  

/** 
 * 重載objectToJsonStr方法 
 *  
 * @param obj 需要轉換的JAVA對象 
 * @param format 是否格式化 
 * @return JSON字符串 
 * @throws MapperException 
 */  
public static String obj2Json(Object obj, boolean format) throws MapperException {  
    JSONValue jsonValue = JSONMapper.toJSON(obj);  
    String jsonStr = jsonValue.render(format);  
    return jsonStr;  
}  

/** 
 * JSON字符串轉換成JAVA對象 
 *  
 * @param jsonStr JSON字符串 
 * @param cla JAVA對象 
 * @return 轉換後的對象 
 */  
public static Object json2Obj(String jsonStr, Class<?> cla) throws Exception {  
    Object obj = null;  
    try {  
        JSONParser parser = new JSONParser(new StringReader(jsonStr));  
        JSONValue jsonValue = parser.nextValue();  
        if (jsonValue instanceof com.sdicons.json.model.JSONArray) {  
            List<Object> list = new ArrayList<Object>();  
            JSONArray jsonArray = (JSONArray) jsonValue;  
            for (int i = 0; i < jsonArray.size(); i++) {  
                JSONValue jsonObj = jsonArray.get(i);  
                Object javaObj = JSONMapper.toJava(jsonObj, cla);  
                list.add(javaObj);  
            }  
            obj = list;  
        } else if (jsonValue instanceof com.sdicons.json.model.JSONObject) {  
            obj = JSONMapper.toJava(jsonValue, cla);  
        } else {  
            obj = jsonValue;  
        }  
    } catch (Exception e) {  
        e.printStackTrace();  
    }  
    return obj;  
}  

}