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依赖包

json-lib-2.4-jdk15.jar 可以到下载

编写Util类

package cn.sigangjun.util;import java.text.SimpleDateFormat;import java.util.ArrayList;import java.util.Date;import java.util.HashMap;import java.util.List;import java.util.Map;import net.sf.json.JSONObject;import net.sf.json.JsonConfig;import net.sf.json.processors.JsonValueProcessor;import cn.sigangjun.model.People;/** * 
Title: json util
 * 
Description: this util can covert object to jsonstring
 * @since 2013-8-12 下午3:32:19  * @version 1.0 * @author sigangjun */public class JsonUtils {	static JsonConfig jsonConfig = new JsonConfig();	static {		jsonConfig.registerJsonValueProcessor(Date.class,new JsonValueProcessor(){			@Override			public Object processArrayValue(Object value, JsonConfig arg1) {				try {		            if (value instanceof Date) {		                SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");		                return sdf.format((Date) value);		            }		            return value == null ? "" : value.toString();		        } catch (Exception e) {		            return "";		        }			}			@Override			public Object processObjectValue(String arg0, Object arg1,					JsonConfig arg2) {				try {		            if (arg1 instanceof Date) {		                SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");		                return sdf.format((Date) arg1);		            }		            return arg1 == null ? "" : arg1.toString();		        } catch (Exception e) {		            return "";		        }			}					});	}	@SuppressWarnings("rawtypes")	public static String printJsonForTree(List list) {		Map
   
     map = new HashMap
    
     ();		map.put("total", list.size());		map.put("rows", list);		JSONObject json = JSONObject.fromObject(map, jsonConfig);		return json.toString();	}	/**	 * 输出Json串	 * 	 * @param  list   业务集	 * @param  total  总数	 * @return String Json串  	 */	public static String outJsonString (List
      list, Integer total) {		if (list == null || total == null) {			return "";		}		Map
     
       map = new HashMap
      
       ();		map.put("total", total);		map.put("rows", list);		JSONObject json = JSONObject.fromObject(map, jsonConfig);		return json.toString();	}		/**	 * @param args	 */	public static void main(String[] args) {		/*List
       
         list = Lists.newArrayList();		Business bb = new Business();*/		List
        
          alllist = new ArrayList
         
          (); People p1 = new People("000", "我是facher", new Date(), null, null, null); List
          
            childrenlist = new ArrayList
           
            (); People p3 = new People("001", "我是男孩", new Date(), null, null, null); People p4 = new People("002", "我是女孩", new Date(), null, null, null); Map
            
              friends = new HashMap
             
              (); People p5 = new People("003", "我是朋友1", new Date(), null, null, null); People p6 = new People("004", "我是朋友2", new Date(), null, null, null); friends.put("111", p5); friends.put("222", p6); People p2 = new People("123", "打印我吧！", new Date(),p1, childrenlist, friends); alllist.add(p2); System.out.println(printJsonForTree(alllist)); } public static String beanToJson(Object bean) { JSONObject obj = JSONObject.fromObject(bean); return obj.toString(); }}
             
            
           
          
         
        
       
      
     
    
   

编写People类

package cn.sigangjun.model;import java.io.Serializable;import java.util.Date;import java.util.List;import java.util.Map;/** * 
Title: People class
 * 
Description: People Class
 * @since 2013-8-12 下午3:39:38  * @version 1.0 * @author sigangjun */public class People implements Serializable {	private static final long serialVersionUID = 1L;		private String id;		private String name;		private Date birthday;		private People father;		private List
   
     children;		private Map
    
      friends;	public String getId() {		return id;	}	public void setId(String id) {		this.id = id;	}	public String getName() {		return name;	}	public void setName(String name) {		this.name = name;	}	public Date getBirthday() {		return birthday;	}	public void setBirthday(Date birthday) {		this.birthday = birthday;	}	public People getFather() {		return father;	}	public void setFather(People father) {		this.father = father;	}	public List
     
       getChildren() {		return children;	}	public void setChildren(List
      
        children) {		this.children = children;	}	public Map
       
         getFriends() {		return friends;	}	public void setFriends(Map
        
          friends) { this.friends = friends; } public static long getSerialversionuid() { return serialVersionUID; } public People(String id, String name, Date birthday, People father, List
         
           children, Map
          
            friends) { super(); this.id = id; this.name = name; this.birthday = birthday; this.father = father; this.children = children; this.friends = friends; } public People() { super(); // TODO Auto-generated constructor stub } }
          
         
        
       
      
     
    
   

运行结果

{"total":1,"rows":[{"birthday":"2013-08-12 15:43:57","children":[],"father":{"birthday":"2013-08-12 15:43:57","children":[],"father":null,"friends":null,"id":"000","name":"我是facher"},"friends":{"222":{"birthday":"2013-08-12 15:43:57","children":[],"father":null,"friends":null,"id":"004","name":"我是朋友2"},"111":{"birthday":"2013-08-12 15:43:57","children":[],"father":null,"friends":null,"id":"003","name":"我是朋友1"}},"id":"123","name":"打印我吧！"}]}