对象转换器 扩展中

/**
 * @author luxiangxing
 * @time   2010-8-28
 * @email  [e-mail]
 * @tel    [phone]
 */
package teasoft.common.util;

import java.lang.reflect.Field;
import java.util.HashMap;

import teasoft.user.entity.User;

public class TypeConverterUtil {
             /**
              * 将一个对象转换成JSON字符串表示，该对象应该符合 JavaBean规范。
              * 如果对象的某个属性不是数字或字符串，该属性将被忽略，不会出现在JSON字符串中
              *  
              * @param obj
              *            要转换的对象
              * @return 描述该对象的JSON字符串，包括属性名与属性值
              */  
             public static String toJSON(Object obj) {  
                     HashMap<String, String> map = new HashMap<String, String>();  
                     Class c = obj.getClass();  
                     Field[] fields = c.getDeclaredFields();  
                     for (int i = 0; i < fields.length; i++) {  
                             String name = fields[i].getName();  
                             try {  
                                     fields[i].setAccessible(true);  
                                     Object o = fields[i].get(obj);  
                                     if (o instanceof Number) {  
                                             map.put("\"" + name + "\"", o.toString());  
                                     } else if (o instanceof String) {  
                                             map.put("\"" + name + "\"", "\"" + o.toString() + "\"");  
                                     }  
                             } catch (IllegalArgumentException e) {  
                             } catch (IllegalAccessException e) {  
                             }  
                     }  
                     String s = map.toString();  
                     String str = s.replaceAll("\"=", "\":");  
                     return str;  
             }  
             
             /**
              * 将一个对象转换成HashMap，该对象应该符合 JavaBean规范。
              * @param obj
              *            要转换的对象
              * @return 描述该对象的hashMap，包括属性名与属性值
              */  
             public static HashMap toHashMap(Object obj) {  
                     HashMap<String, String> map = new HashMap<String, String>();  
                     Class c = obj.getClass();  
                     Field[] fields = c.getDeclaredFields();  
                     for (int i = 0; i < fields.length; i++) {  
                             String name = fields[i].getName();  
                             try {  
                                     fields[i].setAccessible(true);  
                                     Object o = fields[i].get(obj);
                                     
                                     if ( o!=null && o instanceof Number) {  
                                             map.put( name , o.toString());  
                                     } else if (o!=null && o instanceof String) {  
                                             map.put( name ,  o.toString() );  
                                     }  
                             } catch (IllegalArgumentException e) {  
                             } catch (IllegalAccessException e) {  
                             }  
                     }  
                   return map;
             }  
       
             public static void main(String[] args) {
                User user = new User();
                user.setId(1);
                user.setUserName("lxx");
                HashMap hm = TypeConverterUtil.toHashMap(user);
                System.out.println(hm.get("id"));
                System.out.println(hm.get("userName"));
                System.out.println(hm.get("password"));
             }
}