JSON解析工具-json-lib

一、简介
json-lib是一个Java类库，提供将Java对象，包括beans,maps,collections,java arrays和xml等转换成JSON,或者反向转换的功能。
二、准备
在使用json-lib之前，我们应该到官方网址下载如下包：
jakarta commons-lang 2.5
jakarta commons-beanutils 1.8.0
jakarta commons-collections 3.2.1
jakarta commons-logging 1.1.1
ezmorph 1.0.6
并将这些jar包引入到Eclipse项目当中，即可调用。
三、讲解
在进行下面的代码演示之前，我们先将几个基本的类介绍一下：
MyBean类：
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public class MyBean {  
    private String id = null;  
    private String name = null;  
ﾠ  private Date date = null;  
ﾠ  private List cardNum = null;  
    private String[] cardType = {"身份证", "银行卡" , "公车卡"};  
  
ﾠ ﾠ public String getId() {  
        return id;  
    }  
ﾠ ﾠ public void setId(String id) {  
        this.id = id;  
    }  
    public String getName() {  
        return name;  [color=blue][/color]
    }  
ﾠ ﾠ public void setName(String name) {  
        this.name = name;  
    }  
ﾠ ﾠ public Date getDate() {  
        return date;  
    }  
ﾠ ﾠ public void setDate(Date date) {  
        this.date = date;  
    }  
ﾠ ﾠ public List getCardNum() {  
ﾠ ﾠ ﾠ ﾠ return cardNum;  
    }  
ﾠ ﾠ public void setCardNum(List cardNum) {  
ﾠ ﾠ ﾠ ﾠ this.cardNum = cardNum;  
    }  
ﾠ ﾠ public String[] getCardType() {  
ﾠ ﾠ ﾠ ﾠ return cardType;  
    }  
ﾠ ﾠ public void setCardType(String[] cardType) {  
         this.cardType = cardType;  
    }  
}  
Person类：
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public class Person {  
    private String name = null;  
    public Person(){  
    }  
    public Person(String name){  
        this.name = name;  
    }  
ﾠ ﾠ public String getName() {  
        return name;  
    }  
ﾠ ﾠ public void setName(String name) {  
        this.name = name;  
    }  
}  
  
MyBeanWithPerson类：  
public class MyBeanWithPerson {  
    private List<Person> list = null;  
ﾠ ﾠ private Map<String,Person> map = null;  
ﾠ ﾠ public List getList() {  
        return list;  
    }  
ﾠ ﾠ public void setList(List list) {  
        this.list = list;  
    }  
ﾠ ﾠ public Map getMap() {  
        return map;  
    }  
ﾠ ﾠ public void setMap(Map map) {  
        this.map = map;  
    }  
}  
1.将json字符串转换成JSON，根据情况用JSONArray或JSONObject
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public static void testJsonStrToJSON() {  
    JSONArray jsonArray = JSONArray.fromObject("[\"json\",\"is\",\"easy\"]");  
ﾠ ﾠ System.out.println(jsonArray);  
}  
2.将Java Bean转换成JSON对象
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public static void testBeadToJSON() {  
    MyBean bean = new MyBean();  
    bean.setId("001");  
    bean.setName("银行卡");  
    bean.setDate(new Date());  
  
ﾠ ﾠ List cardNum = new ArrayList();  
    cardNum.add("农行");  
    cardNum.add("工行");  
    cardNum.add("建行");  
    cardNum.add(new Person("test"));  
  
ﾠ ﾠ bean.setCardNum(cardNum);  
  
ﾠ ﾠ JSONObject jsonObject = JSONObject.fromObject(bean);  
ﾠ ﾠ System.out.println(jsonObject);  
}  
3.将一般的数组转换成JSON
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public static void testArrayToJSON() {  
    boolean[] boolArray = new boolean[] { true, false, true };  
    JSONArray jsonArray = JSONArray.fromObject(boolArray);  
    System.out.println(jsonArray);  
}  
4.将Collection对象转换成JSON
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public static void testListToJSON() {  
    List list = new ArrayList();  
    list.add("first");  
    list.add("second");  
ﾠ ﾠ JSONArray jsonArray = JSONArray.fromObject(list);  
ﾠ ﾠ System.out.println(jsonArray);  
} <span style="font-family: Simsun; font-size: 15.555556297302246px;"> </span> 
5.将Map转换成JSON
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public static 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]; }");  
  
ﾠ ﾠ JSONObject jsonObject = JSONObject.fromObject(map);  
ﾠ ﾠ System.out.println(jsonObject);  
}  
6.将普通类型的JSON字符串转换成JSON
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public static void testJSONToObject() throws Exception {  
    // 将JSon字符串转换成JsonObject对象  
    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);  
  
     // 将JsonObject对象转换成JavaBean对象  
    Object bean = JSONObject.toBean(jsonObject);  
ﾠ ﾠ System.out.println(PropertyUtils.getProperty(bean, "name"));  
ﾠ ﾠ System.out.println(PropertyUtils.getProperty(bean, "bool"));  
ﾠ ﾠ System.out.println(PropertyUtils.getProperty(bean, "int"));  
    System.out.println(PropertyUtils.getProperty(bean, "double"));  
ﾠ ﾠ System.out.println(PropertyUtils.getProperty(bean, "func"));  
ﾠ ﾠ System.out.println(PropertyUtils.getProperty(bean, "array"));  
ﾠ ﾠ List arrayList = (List) JSONArray.toCollection(jsonObject.getJSONArray("array"));  
ﾠ ﾠ for (Object object : arrayList) {  
        System.out.println(object);  
    }  
} <span style="font-family: Simsun; font-size: 15.555556297302246px;"> </span> 
7.将复合类型的JSON字符串转换成复合对象，包含List
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public static void testJSONToBeanHavaList() {  
    String json = "{list:[{name:\"test1\"},{name:\"test2\"}]}";  
    Map classMap = new HashMap();  
    classMap.put("list", Person.class);  
ﾠ ﾠ MyBeanWithPerson diyBean = (MyBeanWithPerson) JSONObject.toBean(  
ﾠ ﾠ JSONObject.fromObject(json), MyBeanWithPerson.class, classMap);  
ﾠ ﾠ System.out.println(diyBean);  
  
ﾠ ﾠ List list = diyBean.getList();  
    for (Object o : list) {  
        if (o instanceof Person) {  
            Person p = (Person) o;  
ﾠ ﾠ ﾠ ﾠ ﾠ ﾠ System.out.println(p.getName());  
        }  
    }  
}  
8.将复合类型的JSON字符串转换成复合对象，包含Map
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public static void testJSONToBeanHavaMap() {  
    // 把Map看成一个对象  
    String json = "{list:[{name:\"test1\"},{name:\"test2\"}],map:{test1:{name:\"test1\"},test2:{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);  
ﾠ ﾠ System.out.println(diyBean);  
  
ﾠ ﾠ System.out.println("do the list release");  
    List<Person> list = diyBean.getList();  
    for (Person o : list) {  
        Person p = (Person) o;  
ﾠ ﾠ ﾠ ﾠ System.out.println(p.getName());  
    }  
  
ﾠ ﾠ 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();  
ﾠ ﾠ Morpher dynaMorpher = new BeanMorpher(Person.class, morpherRegistry);  
    morpherRegistry.registerMorpher(dynaMorpher);  
  
ﾠ ﾠ 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  
ﾠ ﾠ System.out.println(map);  
ﾠ ﾠ ﾠList<Person> output = new ArrayList();  
ﾠ ﾠ 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) {  
ﾠ ﾠ ﾠ ﾠ System.out.println(p.getName());  
    }  
}