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2008-08-29 17:03:32

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();
        }
    }
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