序列化对象为JSON格式

旧城等待， 2022-08-27 12:40 242阅读 0赞

import java.beans.IntrospectionException;  
    import java.beans.Introspector;  
    import java.beans.PropertyDescriptor;  
    import java.math.BigDecimal;  
    import java.math.BigInteger;  
    import java.util.List;  
    import java.util.Map;  
    import java.util.Set;  
    /\*\*  
     \* 序列化对象为JSON格式 遵循JSON组织公布标准  
     \*  
     \* @date 2008/05/07  
     \* @version 1.0.0  
     \*/  
    public class Json \{  
        /\*\* Commons Logging instance. \*/  
        private static org.apache.commons.logging.Log log = org.apache.commons.logging.LogFactory.getLog(Json.class);  
        /\*\*  
         \* @param obj 任意对象  
         \* @return String  
         \*/  
        public static String object2json(Object obj) \{  
            StringBuilder json = new StringBuilder();  
            if (obj == null) \{  
                json.append("/"/"");  
            \} else if (obj instanceof String || obj instanceof Integer || obj instanceof Float || obj instanceof Boolean  
                    || obj instanceof Short || obj instanceof Double || obj instanceof Long || obj instanceof BigDecimal  
                    || obj instanceof BigInteger || obj instanceof Byte) \{  
                json.append("/"").append(string2json(obj.toString())).append("/"");  
            \} else if (obj instanceof Object\[\]) \{  
                json.append(array2json((Object\[\]) obj));  
            \} else if (obj instanceof List) \{  
                json.append(list2json((List<?>) obj));  
            \} else if (obj instanceof Map) \{  
                json.append(map2json((Map<?, ?>) obj));  
            \} else if (obj instanceof Set) \{  
                json.append(set2json((Set<?>) obj));  
            \} else \{  
                json.append(bean2json(obj));  
            \}  
            return json.toString();  
        \}  
        /\*\*  
         \* @param bean bean对象  
         \* @return String  
         \*/  
        public static String bean2json(Object bean) \{  
            StringBuilder json = new StringBuilder();  
            json.append("\{");  
            PropertyDescriptor\[\] props = null;  
            try \{  
                props = Introspector.getBeanInfo(bean.getClass(), Object.class).getPropertyDescriptors();  
            \} catch (IntrospectionException e) \{  
            \}  
            if (props != null) \{  
                for (int i = 0; i < props.length; i++) \{  
                    try \{  
                        String name = object2json(props\[i\].getName());  
                        String value = object2json(props\[i\].getReadMethod().invoke(bean));  
                        json.append(name);  
                        json.append(":");  
                        json.append(value);  
                        json.append(",");  
                    \} catch (Exception e) \{  
                    \}  
                \}  
                json.setCharAt(json.length() - 1, '\}');  
            \} else \{  
                json.append("\}");  
            \}  
            return json.toString();  
        \}  
        /\*\*  
         \* @param list list对象  
         \* @return String  
         \*/  
        public static String list2json(List<?> list) \{  
            StringBuilder json = new StringBuilder();  
            json.append("\[");  
            if (list != null && list.size() > 0) \{  
                for (Object obj : list) \{  
                    json.append(object2json(obj));  
                    json.append(",");  
                \}  
                json.setCharAt(json.length() - 1, '\]');  
            \} else \{  
                json.append("\]");  
            \}  
            return json.toString();  
        \}  
        /\*\*  
         \* @param array 对象数组  
         \* @return String  
         \*/  
        public static String array2json(Object\[\] array) \{  
            StringBuilder json = new StringBuilder();  
            json.append("\[");  
            if (array != null && array.length > 0) \{  
                for (Object obj : array) \{  
                    json.append(object2json(obj));  
                    json.append(",");  
                \}  
                json.setCharAt(json.length() - 1, '\]');  
            \} else \{  
                json.append("\]");  
            \}  
            return json.toString();  
        \}  
        /\*\*  
         \* @param map map对象  
         \* @return String  
         \*/  
        public static String map2json(Map<?, ?> map) \{  
            StringBuilder json = new StringBuilder();  
            json.append("\{");  
            if (map != null && map.size() > 0) \{  
                for (Object key : map.keySet()) \{  
                    json.append(object2json(key));  
                    json.append(":");  
                    json.append(object2json(map.get(key)));  
                    json.append(",");  
                \}  
                json.setCharAt(json.length() - 1, '\}');  
            \} else \{  
                json.append("\}");  
            \}  
            return json.toString();  
        \}  
        /\*\*  
         \* @param set 集合对象  
         \* @return String  
         \*/  
        public static String set2json(Set<?> set) \{  
            StringBuilder json = new StringBuilder();  
            json.append("\[");  
            if (set != null && set.size() > 0) \{  
                for (Object obj : set) \{  
                    json.append(object2json(obj));  
                    json.append(",");  
                \}  
                json.setCharAt(json.length() - 1, '\]');  
            \} else \{  
                json.append("\]");  
            \}  
            return json.toString();  
        \}  
        /\*\*  
         \* @param s 参数  
         \* @return String  
         \*/  
        public static String string2json(String s) \{  
            if (s == null)  
                return "";  
            StringBuilder sb = new StringBuilder();  
            for (int i = 0; i < s.length(); i++) \{  
                char ch = s.charAt(i);  
                switch (ch) \{  
                case '"':  
                    sb.append(" ///"");  
                    break;  
                case '//':  
                    sb.append(" ");  
                    break;  
                case '/b':  
                    sb.append(" //b");  
                    break;  
                case '/f':  
                    sb.append(" //f");  
                    break;  
                case '/n':  
                    sb.append(" //n");  
                    break;  
                case '/r':  
                    sb.append(" //r");  
                    break;  
                case '/t':  
                    sb.append(" //t");  
                    break;  
                case '/':  
                    sb.append(" ///");  
                    break;  
                default:  
                    if (ch >= '/u0000' && ch <= '/u001F') \{  
                        String ss = Integer.toHexString(ch);  
                        sb.append(" //u");  
                        for (int k = 0; k < 4 - ss.length(); k++) \{  
                            sb.append('0');  
                        \}  
                        sb.append(ss.toUpperCase());  
                    \} else \{  
                        sb.append(ch);  
                    \}  
                \}  
            \}  
            return sb.toString();  
        \}  
    \}