org.json和json-lib比较

public class JsonUtil {         
        
            
    public static Object getObject4JsonString(String jsonString, Class pojoCalss) {         
        Object pojo;         
        JSONObject jsonObject = JSONObject.fromObject(jsonString);         
        pojo = JSONObject.toBean(jsonObject, pojoCalss);         
        return pojo;         
    }         
        
        
            
    public static Map getMap4Json(String jsonString) {         
        JSONObject jsonObject = JSONObject.fromObject(jsonString);         
        Iterator keyIter = jsonObject.keys();         
        String key;         
        Object value;         
        Map valueMap = new HashMap();         
        
        while (keyIter.hasNext()) {         
            key = (String) keyIter.next();         
            value = jsonObject.get(key);         
            valueMap.put(key, value);         
        }         
        
        return valueMap;         
    }         
        
        
            
    public static Object[] getObjectArray4Json(String jsonString) {         
        JSONArray jsonArray = JSONArray.fromObject(jsonString);         
        return jsonArray.toArray();         
        
    }         
        
        
            
    public static List getList4Json(String jsonString, Class pojoClass) {         
        
        JSONArray jsonArray = JSONArray.fromObject(jsonString);         
        JSONObject jsonObject;         
        Object pojoValue;         
        
        List list = new ArrayList();         
        for (int i = 0; i < jsonArray.size(); i++) {         
        
            jsonObject = jsonArray.getJSONObject(i);         
            pojoValue = JSONObject.toBean(jsonObject, pojoClass);         
            list.add(pojoValue);         
        
        }         
        return list;         
        
    }         
        
        
            
    public static String[] getStringArray4Json(String jsonString) {         
        
        JSONArray jsonArray = JSONArray.fromObject(jsonString);         
        String[] stringArray = new String[jsonArray.size()];         
        for (int i = 0; i < jsonArray.size(); i++) {         
            stringArray[i] = jsonArray.getString(i);         
        
        }         
        
        return stringArray;         
    }         
        
        
            
    public static Long[] getLongArray4Json(String jsonString) {         
        
        JSONArray jsonArray = JSONArray.fromObject(jsonString);         
        Long[] longArray = new Long[jsonArray.size()];         
        for (int i = 0; i < jsonArray.size(); i++) {         
            longArray[i] = jsonArray.getLong(i);         
        
        }         
        return longArray;         
    }         
        
        
            
    public static Integer[] getIntegerArray4Json(String jsonString) {         
        
        JSONArray jsonArray = JSONArray.fromObject(jsonString);         
        Integer[] integerArray = new Integer[jsonArray.size()];         
        for (int i = 0; i < jsonArray.size(); i++) {         
            integerArray[i] = jsonArray.getInt(i);         
        
        }         
        return integerArray;         
    }         
        
            
    public static Date[] getDateArray4Json(String jsonString, String DataFormat)         
            throws ParseException {         
        
        JSONArray jsonArray = JSONArray.fromObject(jsonString);         
        Date[] dateArray = new Date[jsonArray.size()];         
        String dateString;         
        Date date;         
        
        for (int i = 0; i < jsonArray.size(); i++) {         
            dateString = jsonArray.getString(i);         
            date = DateUtil.parseDate(dateString, DataFormat);         
            dateArray[i] = date;         
        
        }         
        return dateArray;         
    }         
        
        
            
    public static Double[] getDoubleArray4Json(String jsonString) {         
        
        JSONArray jsonArray = JSONArray.fromObject(jsonString);         
        Double[] doubleArray = new Double[jsonArray.size()];         
        for (int i = 0; i < jsonArray.size(); i++) {         
            doubleArray[i] = jsonArray.getDouble(i);         
        
        }         
        return doubleArray;         
    }         
        
        
            
    public static String getJsonString4JavaPOJO(Object javaObj) {         
        
        JSONObject json;         
        json = JSONObject.fromObject(javaObj);         
        return json.toString();         
        
    }         
        
            
    public static String getJsonString4JavaPOJO(Object javaObj,         
            String dataFormat) {         
        
        JSONObject json;         
        JsonConfig jsonConfig = configJson(dataFormat);         
        json = JSONObject.fromObject(javaObj, jsonConfig);         
        return json.toString();         
        
    }         
        
            
    public static JsonConfig configJson(String datePattern) {         
        JsonConfig jsonConfig = new JsonConfig();         
        jsonConfig.setExcludes(new String[] { "" });         
        jsonConfig.setIgnoreDefaultExcludes(false);         
        jsonConfig.setCycleDetectionStrategy(CycleDetectionStrategy.LENIENT);         
        jsonConfig.registerJsonValueProcessor(Date.class,         
                new JsonDateValueProcessor(datePattern));         
        
        return jsonConfig;         
    }         
        
        
            
    public static JsonConfig configJson(String[] excludes, String datePattern) {         
        JsonConfig jsonConfig = new JsonConfig();         
        jsonConfig.setExcludes(excludes);         
        jsonConfig.setIgnoreDefaultExcludes(true);         
        jsonConfig.setCycleDetectionStrategy(CycleDetectionStrategy.LENIENT);         
        jsonConfig.registerJsonValueProcessor(Date.class,         
                new JsonDateValueProcessor(datePattern));         
        
        return jsonConfig;         
    }         
        
}    
   
   
package com.baiyyy.polabs.util.json;         
        
import java.text.SimpleDateFormat;         
import java.util.Date;         
        
import net.sf.json.JsonConfig;         
import net.sf.json.processors.JsonValueProcessor;         
        
        
public class JsonDateValueProcessor implements JsonValueProcessor {            
               
    private String format = "yyyy-MM-dd HH:mm:ss";            
           
    public JsonDateValueProcessor() {            
           
    }            
           
    public JsonDateValueProcessor(String format) {            
        this.format = format;            
    }            
           
    public Object processArrayValue(Object value, JsonConfig jsonConfig) {            
        String[] obj = {};            
        if (value instanceof Date[]) {            
            SimpleDateFormat sf = new SimpleDateFormat(format);            
            Date[] dates = (Date[]) value;            
            obj = new String[dates.length];            
            for (int i = 0; i < dates.length; i++) {            
                obj[i] = sf.format(dates[i]);            
            }            
        }            
        return obj;            
    }            
           
    public Object processObjectValue(String key, Object value, JsonConfig jsonConfig) {            
        if (value instanceof Date) {            
            String str = new SimpleDateFormat(format).format((Date) value);            
            return str;            
        }            
        return value == null ? null : value.toString();            
    }            
           
    public String getFormat() {            
        return format;            
    }            
           
    public void setFormat(String format) {            
        this.format = format;            
    }            
           
}    

Json与javaBean之间的转换工具类http://www.oschina.net/code/piece_full?code=17607
 import java.lang.reflect.Field;  import java.util.ArrayList; import java.util.HashMap; import java.util.Iterator; import java.util.List; import java.util.Map; import java.util.Set; 
 import net.sf.json.JSONArray; import net.sf.json.JSONObject; import net.sf.json.JsonConfig; 
 /** 
 * Json与javaBean之间的转换工具类 
 *  
 * @author 晚风工作室 www.soservers.com 
 * @version 20111221 
 *  
 * {@code   现使用json-lib组件实现 
 *          需要 
 *              json-lib-2.4-jdk15.jar 
 *              ezmorph-1.0.6.jar 
 *              commons-collections-3.1.jar 
 *              commons-lang-2.0.jar 
 *          支持 
 * } 
 */ public class JsonPluginsUtil { 
  
  
    /**   
     * 从一个JSON 对象字符格式中得到一个java对象   
     *    
     * @param jsonString   
     * @param beanCalss   
     * @return   
     */
    @SuppressWarnings("unchecked") 
    public static <T> T jsonToBean(String jsonString, Class<T> beanCalss) { 
          
        JSONObject jsonObject = JSONObject.fromObject(jsonString); 
        T bean = (T) JSONObject.toBean(jsonObject, beanCalss); 
          
        return bean; 
          
    } 
  
    /**   
     * 将java对象转换成json字符串   
     * 
     * @param bean   
     * @return   
     */
    public static String beanToJson(Object bean) { 
  
        JSONObject json = JSONObject.fromObject(bean); 
          
        return json.toString(); 
  
    } 
      
    /**   
     * 将java对象转换成json字符串   
     * 
     * @param bean   
     * @return   
     */
    public static String beanToJson(Object bean, String[] _nory_changes, boolean nory) { 
  
        JSONObject json = null; 
          
        if(nory){//转换_nory_changes里的属性             
            Field[] fields = bean.getClass().getDeclaredFields(); 
            String str = ""; 
            for(Field field : fields){ //              System.out.println(field.getName());                 str+=(":"+field.getName()); 
            } 
            fields = bean.getClass().getSuperclass().getDeclaredFields(); 
            for(Field field : fields){ //              System.out.println(field.getName());                 str+=(":"+field.getName()); 
            } 
            str+=":"; 
            for(String s : _nory_changes){ 
                str = str.replace(":"+s+":", ":"); 
            } 
            json = JSONObject.fromObject(bean,configJson(str.split(":"))); 
              
        }else{//转换除了_nory_changes里的属性             
  
              
            json = JSONObject.fromObject(bean,configJson(_nory_changes)); 
        } 
          
          
          
        return json.toString(); 
  
    } 
     private static JsonConfig configJson(String[] excludes) {    
  
                JsonConfig jsonConfig = new JsonConfig();    
  
                jsonConfig.setExcludes(excludes);    //                 jsonConfig.setIgnoreDefaultExcludes(false);    // 
//              jsonConfig.setCycleDetectionStrategy(CycleDetectionStrategy.LENIENT);    //              jsonConfig.registerJsonValueProcessor(Date.class,    
// 
//                  new DateJsonValueProcessor(datePattern));    
                
  
                return jsonConfig;    
  
            }   
  
  
  
  
  
    /** 
     * 将java对象List集合转换成json字符串   
     * @param beans 
     * @return 
     */
    @SuppressWarnings("unchecked") 
    public static String beanListToJson(List beans) { 
          
        StringBuffer rest = new StringBuffer(); 
          
        rest.append("["); 
          
        int size = beans.size(); 
          
        for (int i = 0; i < size; i++) { 
              
            rest.append(beanToJson(beans.get(i))+((i<size-1)?",":"")); 
  
        } 
          
        rest.append("]"); 
          
        return rest.toString(); 
  
    } 
      
    /** 
     *  
     * @param beans 
     * @param _no_changes 
     * @return 
     */
    @SuppressWarnings("unchecked") 
    public static String beanListToJson(List beans, String[] _nory_changes, boolean nory) { 
          
        StringBuffer rest = new StringBuffer(); 
          
        rest.append("["); 
          
        int size = beans.size(); 
          
        for (int i = 0; i < size; i++) { 
            try{ 
                rest.append(beanToJson(beans.get(i),_nory_changes,nory)); 
                if(i<size-1){ 
                    rest.append(","); 
                } 
            }catch(Exception e){ 
                e.printStackTrace(); 
            } 
        } 
          
        rest.append("]"); 
          
        return rest.toString(); 
  
    } 
  
    /**   
     * 从json HASH表达式中获取一个map，改map支持嵌套功能   
     * 
     * @param jsonString   
     * @return   
     */
    @SuppressWarnings({ "unchecked" }) 
    public static Map jsonToMap(String jsonString) { 
          
        JSONObject jsonObject = JSONObject.fromObject(jsonString); 
        Iterator keyIter = jsonObject.keys(); 
        String key; 
        Object value; 
        Map valueMap = new HashMap(); 
  
        while (keyIter.hasNext()) { 
              
            key = (String) keyIter.next(); 
            value = jsonObject.get(key).toString(); 
            valueMap.put(key, value); 
              
        } 
  
        return valueMap; 
    } 
      
    /** 
     * map集合转换成json格式数据 
     * @param map 
     * @return 
     */
    public static String mapToJson(Map<String, ?> map, String[] _nory_changes, boolean nory){ 
          
        String s_json = "{"; 
          
         Set<String> key = map.keySet(); 
         for (Iterator<?> it = key.iterator(); it.hasNext();) { 
             String s = (String) it.next(); 
             if(map.get(s) == null){ 
                   
             }else if(map.get(s) instanceof List<?>){ 
                 s_json+=(s+":"+JsonPluginsUtil.beanListToJson((List<?>)map.get(s), _nory_changes, nory)); 
                  
             }else{ 
                 JSONObject json = JSONObject.fromObject(map); 
                 s_json += (s+":"+json.toString());; 
             } 
               
             if(it.hasNext()){ 
                 s_json+=","; 
             } 
        } 
  
         s_json+="}"; 
        return s_json;  
    } 
  
    /**   
     * 从json数组中得到相应java数组   
     * 
     * @param jsonString   
     * @return   
     */
    public static Object[] jsonToObjectArray(String jsonString) { 
          
        JSONArray jsonArray = JSONArray.fromObject(jsonString); 
          
        return jsonArray.toArray(); 
  
    } 
      
    public static String listToJson(List<?> list) { 
          
        JSONArray jsonArray = JSONArray.fromObject(list); 
          
        return jsonArray.toString(); 
  
    } 
  
    /**   
     * 从json对象集合表达式中得到一个java对象列表   
     * 
     * @param jsonString   
     * @param beanClass   
     * @return   
     */
    @SuppressWarnings("unchecked") 
    public static <T> List<T> jsonToBeanList(String jsonString, Class<T> beanClass) { 
  
        JSONArray jsonArray = JSONArray.fromObject(jsonString); 
        JSONObject jsonObject; 
        T bean; 
        int size = jsonArray.size(); 
        List<T> list = new ArrayList<T>(size); 
  
        for (int i = 0; i < size; i++) { 
  
            jsonObject = jsonArray.getJSONObject(i); 
            bean = (T) JSONObject.toBean(jsonObject, beanClass); 
            list.add(bean); 
  
        } 
          
        return list; 
  
    } 
  
    /**   
     * 从json数组中解析出java字符串数组   
     * 
     * @param jsonString   
     * @return   
     */
    public static String[] jsonToStringArray(String jsonString) { 
  
        JSONArray jsonArray = JSONArray.fromObject(jsonString); 
        String[] stringArray = new String[jsonArray.size()]; 
        int size = jsonArray.size(); 
  
        for (int i = 0; i < size; i++) { 
  
            stringArray[i] = jsonArray.getString(i); 
  
        } 
  
        return stringArray; 
    } 
  
    /**   
     * 从json数组中解析出javaLong型对象数组   
     * 
     * @param jsonString   
     * @return   
     */
    public static Long[] jsonToLongArray(String jsonString) { 
  
        JSONArray jsonArray = JSONArray.fromObject(jsonString); 
        int size = jsonArray.size(); 
        Long[] longArray = new Long[size]; 
          
        for (int i = 0; i < size; i++) { 
              
            longArray[i] = jsonArray.getLong(i); 
  
        } 
          
        return longArray; 
          
    } 
  
    /**   
     * 从json数组中解析出java Integer型对象数组   
     * 
     * @param jsonString   
     * @return   
     */
    public static Integer[] jsonToIntegerArray(String jsonString) { 
  
        JSONArray jsonArray = JSONArray.fromObject(jsonString); 
        int size = jsonArray.size(); 
        Integer[] integerArray = new Integer[size]; 
          
        for (int i = 0; i < size; i++) { 
              
            integerArray[i] = jsonArray.getInt(i); 
  
        } 
          
        return integerArray; 
          
    } 
  
    /**   
     * 从json数组中解析出java Double型对象数组   
     * 
     * @param jsonString   
     * @return   
     */
    public static Double[] jsonToDoubleArray(String jsonString) { 
  
        JSONArray jsonArray = JSONArray.fromObject(jsonString); 
        int size = jsonArray.size(); 
        Double[] doubleArray = new Double[size]; 
          
        for (int i = 0; i < size; i++) { 
              
            doubleArray[i] = jsonArray.getDouble(i); 
  
        } 
          
        return doubleArray; 
          
    } 
  
} 

package com.mai.json;

import static org.junit.Assert.assertEquals;

import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import net.sf.ezmorph.Morpher;
import net.sf.ezmorph.MorpherRegistry;
import net.sf.ezmorph.bean.BeanMorpher;
import net.sf.json.JSONArray;
import net.sf.json.JSONObject;
import net.sf.json.util.JSONUtils;

import org.apache.commons.beanutils.PropertyUtils;
import org.junit.Test;

public class JsonLibTest {

    /*
     *  普通类型、List、Collection等都是用JSONArray解析
     *  
     *  Map、自定义类型是用JSONObject解析
     *  可以将Map理解成一个对象，里面的key/value对可以理解成对象的属性/属性值
     *  即{key1:value1,key2,value2......}
     * 
     * 1.JSONObject是一个name:values集合，通过它的get(key)方法取得的是key后对应的value部分(字符串)
     *         通过它的getJSONObject(key)可以取到一个JSONObject，--> 转换成map,
     *         通过它的getJSONArray(key) 可以取到一个JSONArray ，
     * 
     * 
     */
    
    //一般数组转换成JSON
    @Test
    public void testArrayToJSON(){
        boolean[] boolArray = new boolean[]{true,false,true};  
        JSONArray jsonArray = JSONArray.fromObject( boolArray );  
        System.out.println( jsonArray );  
        // prints [true,false,true]  
    }
    
    
    //Collection对象转换成JSON
    @Test
    public void testListToJSON(){
        List list = new ArrayList();  
        list.add( "first" );  
        list.add( "second" );  
        JSONArray jsonArray = JSONArray.fromObject( list );  
        System.out.println( jsonArray );  
        // prints ["first","second"]  
    }
    
    
    //字符串json转换成json， 根据情况是用JSONArray或JSONObject
    @Test
    public void testJsonStrToJSON(){
        JSONArray jsonArray = JSONArray.fromObject( "[‘json‘,‘is‘,‘easy‘]" );  
        System.out.println( jsonArray );  
        // prints ["json","is","easy"]  
    }
    
    
    //Map转换成json， 是用jsonObject
    @Test
    public void testMapToJSON(){
        Map map = new HashMap();  
        map.put( "name", "json" );  
        map.put( "bool", Boolean.TRUE );  
        map.put( "int", new Integer(1) );  
        map.put( "arr", new String[]{"a","b"} );  
        map.put( "func", "function(i){ return this.arr[i]; }" );  
          
        JSONObject jsonObject = JSONObject.fromObject( map );  
        System.out.println( jsonObject );  
    }
    
    //复合类型bean转成成json
    @Test
    public void testBeadToJSON(){
        MyBean bean = new MyBean();
        bean.setId("001");
        bean.setName("银行卡");
        bean.setDate(new Date());
        
        List cardNum = new ArrayList();
        cardNum.add("农行");
        cardNum.add("工行");
        cardNum.add("建行");
        cardNum.add(new Person("test"));
        
        bean.setCardNum(cardNum);
        
        JSONObject jsonObject = JSONObject.fromObject(bean);
        System.out.println(jsonObject);
        
    }
    
    //普通类型的json转换成对象
    @Test
    public void testJSONToObject() throws Exception{
        String json = "{name=\"json\",bool:true,int:1,double:2.2,func:function(a){ return a; },array:[1,2]}";  
        JSONObject jsonObject = JSONObject.fromObject( json ); 
        System.out.println(jsonObject);
        Object bean = JSONObject.toBean( jsonObject ); 
        assertEquals( jsonObject.get( "name" ), PropertyUtils.getProperty( bean, "name" ) );  
        assertEquals( jsonObject.get( "bool" ), PropertyUtils.getProperty( bean, "bool" ) );  
        assertEquals( jsonObject.get( "int" ), PropertyUtils.getProperty( bean, "int" ) );  
        assertEquals( jsonObject.get( "double" ), PropertyUtils.getProperty( bean, "double" ) );  
        assertEquals( jsonObject.get( "func" ), PropertyUtils.getProperty( bean, "func" ) );  
        System.out.println(PropertyUtils.getProperty(bean, "name"));
        System.out.println(PropertyUtils.getProperty(bean, "bool"));
        System.out.println(PropertyUtils.getProperty(bean, "int"));
        System.out.println(PropertyUtils.getProperty(bean, "double"));
        System.out.println(PropertyUtils.getProperty(bean, "func"));
        System.out.println(PropertyUtils.getProperty(bean, "array"));
        
        List arrayList = (List)JSONArray.toCollection(jsonObject.getJSONArray("array"));
        for(Object object : arrayList){
            System.out.println(object);
        }
        
    }
    
    
    //将json解析成复合类型对象, 包含List
    @Test
    public void testJSONToBeanHavaList(){
        String json = "{list:[{name:‘test1‘},{name:‘test2‘}],map:{test1:{name:‘test1‘},test2:{name:‘test2‘}}}";
//        String json = "{list:[{name:‘test1‘},{name:‘test2‘}]}";
        Map classMap = new HashMap();
        classMap.put("list", Person.class);
        MyBeanWithPerson diyBean = (MyBeanWithPerson)JSONObject.toBean(JSONObject.fromObject(json),MyBeanWithPerson.class , classMap);
        System.out.println(diyBean);
        
        List list = diyBean.getList();
        for(Object o : list){
            if(o instanceof Person){
                Person p = (Person)o;
                System.out.println(p.getName());
            }
        }
    }
    
    
    //将json解析成复合类型对象, 包含Map
    @Test
    public void testJSONToBeanHavaMap(){
        //把Map看成一个对象
        String json = "{list:[{name:‘test1‘},{name:‘test2‘}],map:{testOne:{name:‘test1‘},testTwo:{name:‘test2‘}}}";
        Map classMap = new HashMap();
        classMap.put("list", Person.class);
        classMap.put("map", Map.class);
        //使用暗示，直接将json解析为指定自定义对象，其中List完全解析,Map没有完全解析
        MyBeanWithPerson diyBean = (MyBeanWithPerson)JSONObject.toBean(JSONObject.fromObject(json),MyBeanWithPerson.class , classMap);
        System.out.println(diyBean);
        
        System.out.println("do the list release");
        List<Person> list = diyBean.getList();
        for(Person o : list){
            Person p = (Person)o;
            System.out.println(p.getName());
        }
        
        System.out.println("do the map release");
        
        //先往注册器中注册变换器，需要用到ezmorph包中的类
        MorpherRegistry morpherRegistry = JSONUtils.getMorpherRegistry();
        Morpher dynaMorpher = new BeanMorpher( Person.class,  morpherRegistry);  
        morpherRegistry.registerMorpher( dynaMorpher );  
        
        
        Map map = diyBean.getMap();
        /*这里的map没进行类型暗示，故按默认的，里面存的为net.sf.ezmorph.bean.MorphDynaBean类型的对象*/
        System.out.println(map);
　　　　　　/*输出:
　　　　　　　　{testOne=net.sf.ezmorph.bean.MorphDynaBean@f73c1[
　　　　　　　　  {name=test1}
　　　　　　　　], testTwo=net.sf.ezmorph.bean.MorphDynaBean@186c6b2[
 　　　　　　　　 {name=test2}
　　　　　　　　]}
　　　　　　*/
        List<Person> output = new ArrayList();  
        for( Iterator i = map.values().iterator(); i.hasNext(); ){  
            //使用注册器对指定DynaBean进行对象变换
           output.add( (Person)morpherRegistry.morph( Person.class, i.next() ) );  
        }  
        
        for(Person p : output){
            System.out.println(p.getName());
　　　　　　　　/*输出:
　　　　　　　　　　test1
　　　　　　　　　　test2
　　　　　　　　*/
        }
        
    }
    
    
    
}
 
http://www.cnblogs.com/mailingfeng/archive/2012/01/18/2325707.html