JsonUtil

    package com.feit.crm.util;  
       
     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 JsonUtil {  
     /** Commons Logging instance. */  
     private static org.apache.commons.logging.Log log = org.apache.commons.logging.LogFactory  
     .getLog(JsonUtil.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();  
     }  
     }