Json与javaBean之间的转换工具类

来源：互联网发布：java串口编程源代码编辑：程序博客网时间：2024/05/21 09:15
import java.lang.reflect.Field;import java.util.ArrayList;import java.util.HashMap;import java.util.Iterator;import java.util.List;import java.util.Map;import java.util.Set; import net.sf.json.JSONArray;import net.sf.json.JSONObject;import net.sf.json.JsonConfig; /** * Json与javaBean之间的转换工具类 *  * @author 晚风工作室 www.soservers.com * @version 20111221 *  * {@code   现使用json-lib组件实现 *          需要 *              json-lib-2.4-jdk15.jar *              ezmorph-1.0.6.jar *              commons-collections-3.1.jar *              commons-lang-2.0.jar *          支持 * } */public class JsonPluginsUtil {      /**       * 从一个JSON 对象字符格式中得到一个java对象       *        * @param jsonString       * @param beanCalss       * @return       */    @SuppressWarnings("unchecked")    public static <T> T jsonToBean(String jsonString, Class<T> beanCalss) {                 JSONObject jsonObject = JSONObject.fromObject(jsonString);        T bean = (T) JSONObject.toBean(jsonObject, beanCalss);                 return bean;             }     /**       * 将java对象转换成json字符串       *     * @param bean       * @return       */    public static String beanToJson(Object bean) {         JSONObject json = JSONObject.fromObject(bean);                 return json.toString();     }         /**       * 将java对象转换成json字符串       *     * @param bean       * @return       */    public static String beanToJson(Object bean, String[] _nory_changes, boolean nory) {         JSONObject json = null;                 if(nory){//转换_nory_changes里的属性                         Field[] fields = bean.getClass().getDeclaredFields();            String str = "";            for(Field field : fields){//              System.out.println(field.getName());                str+=(":"+field.getName());            }            fields = bean.getClass().getSuperclass().getDeclaredFields();            for(Field field : fields){//              System.out.println(field.getName());                str+=(":"+field.getName());            }            str+=":";            for(String s : _nory_changes){                str = str.replace(":"+s+":", ":");            }            json = JSONObject.fromObject(bean,configJson(str.split(":")));                     }else{//转换除了_nory_changes里的属性                                       json = JSONObject.fromObject(bean,configJson(_nory_changes));        }                                   return json.toString();     }     private static JsonConfig configJson(String[] excludes) {                    JsonConfig jsonConfig = new JsonConfig();                    jsonConfig.setExcludes(excludes);   //                jsonConfig.setIgnoreDefaultExcludes(false);   ////              jsonConfig.setCycleDetectionStrategy(CycleDetectionStrategy.LENIENT);    //              jsonConfig.registerJsonValueProcessor(Date.class,   ////                  new DateJsonValueProcessor(datePattern));                                    return jsonConfig;                }           /**     * 将java对象List集合转换成json字符串       * @param beans     * @return     */    @SuppressWarnings("unchecked")    public static String beanListToJson(List beans) {                 StringBuffer rest = new StringBuffer();                 rest.append("[");                 int size = beans.size();                 for (int i = 0; i < size; i++) {                         rest.append(beanToJson(beans.get(i))+((i<size-1)?",":""));         }                 rest.append("]");                 return rest.toString();     }         /**     *      * @param beans     * @param _no_changes     * @return     */    @SuppressWarnings("unchecked")    public static String beanListToJson(List beans, String[] _nory_changes, boolean nory) {                 StringBuffer rest = new StringBuffer();                 rest.append("[");                 int size = beans.size();                 for (int i = 0; i < size; i++) {            try{                rest.append(beanToJson(beans.get(i),_nory_changes,nory));                if(i<size-1){                    rest.append(",");                }            }catch(Exception e){                e.printStackTrace();            }        }                 rest.append("]");                 return rest.toString();     }     /**       * 从json HASH表达式中获取一个map，改map支持嵌套功能       *     * @param jsonString       * @return       */    @SuppressWarnings({ "unchecked" })    public static Map jsonToMap(String jsonString) {                 JSONObject jsonObject = JSONObject.fromObject(jsonString);        Iterator keyIter = jsonObject.keys();        String key;        Object value;        Map valueMap = new HashMap();         while (keyIter.hasNext()) {                         key = (String) keyIter.next();            value = jsonObject.get(key).toString();            valueMap.put(key, value);                     }         return valueMap;    }         /**     * map集合转换成json格式数据     * @param map     * @return     */    public static String mapToJson(Map<String, ?> map, String[] _nory_changes, boolean nory){                 String s_json = "{";                  Set<String> key = map.keySet();         for (Iterator<?> it = key.iterator(); it.hasNext();) {             String s = (String) it.next();             if(map.get(s) == null){                               }else if(map.get(s) instanceof List<?>){                 s_json+=(s+":"+JsonPluginsUtil.beanListToJson((List<?>)map.get(s), _nory_changes, nory));                              }else{                 JSONObject json = JSONObject.fromObject(map);                 s_json += (s+":"+json.toString());;             }                           if(it.hasNext()){                 s_json+=",";             }        }          s_json+="}";        return s_json;     }     /**       * 从json数组中得到相应java数组       *     * @param jsonString       * @return       */    public static Object[] jsonToObjectArray(String jsonString) {                 JSONArray jsonArray = JSONArray.fromObject(jsonString);                 return jsonArray.toArray();     }         public static String listToJson(List<?> list) {                 JSONArray jsonArray = JSONArray.fromObject(list);                 return jsonArray.toString();     }     /**       * 从json对象集合表达式中得到一个java对象列表       *     * @param jsonString       * @param beanClass       * @return       */    @SuppressWarnings("unchecked")    public static <T> List<T> jsonToBeanList(String jsonString, Class<T> beanClass) {         JSONArray jsonArray = JSONArray.fromObject(jsonString);        JSONObject jsonObject;        T bean;        int size = jsonArray.size();        List<T> list = new ArrayList<T>(size);         for (int i = 0; i < size; i++) {             jsonObject = jsonArray.getJSONObject(i);            bean = (T) JSONObject.toBean(jsonObject, beanClass);            list.add(bean);         }                 return list;     }     /**       * 从json数组中解析出java字符串数组       *     * @param jsonString       * @return       */    public static String[] jsonToStringArray(String jsonString) {         JSONArray jsonArray = JSONArray.fromObject(jsonString);        String[] stringArray = new String[jsonArray.size()];        int size = jsonArray.size();         for (int i = 0; i < size; i++) {             stringArray[i] = jsonArray.getString(i);         }         return stringArray;    }     /**       * 从json数组中解析出javaLong型对象数组       *     * @param jsonString       * @return       */    public static Long[] jsonToLongArray(String jsonString) {         JSONArray jsonArray = JSONArray.fromObject(jsonString);        int size = jsonArray.size();        Long[] longArray = new Long[size];                 for (int i = 0; i < size; i++) {                         longArray[i] = jsonArray.getLong(i);         }                 return longArray;             }     /**       * 从json数组中解析出java Integer型对象数组       *     * @param jsonString       * @return       */    public static Integer[] jsonToIntegerArray(String jsonString) {         JSONArray jsonArray = JSONArray.fromObject(jsonString);        int size = jsonArray.size();        Integer[] integerArray = new Integer[size];                 for (int i = 0; i < size; i++) {                         integerArray[i] = jsonArray.getInt(i);         }                 return integerArray;             }     /**       * 从json数组中解析出java Double型对象数组       *     * @param jsonString       * @return       */    public static Double[] jsonToDoubleArray(String jsonString) {         JSONArray jsonArray = JSONArray.fromObject(jsonString);        int size = jsonArray.size();        Double[] doubleArray = new Double[size];                 for (int i = 0; i < size; i++) {                         doubleArray[i] = jsonArray.getDouble(i);         }                 return doubleArray;             } }
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