<转>基于json-lib.jar包Json实例程序
原链：http://www.cnblogs.com/langtianya/archive/2013/04/09/3009235.html

基于json-lib.jar包Json实例程序
1.JSONObject to DynaBean
String json = "{name=\"json\",bool:true,int:1,double:2.2}";
JSONObject jsonObject = JSONObject.fromObject(json);
//抽象的写法：DynaBean bean = (DynaBean) JSONSerializer.toJava( jsonObject ); 
Object bean = JSONObject.toBean(jsonObject);
//Object bean1 = JSONSerializer.toJava(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"));

2.JSONObject to JavaBean
String json = "{name:\"zhangsan\",age:25,hight:1.72,sex:true}";
JSONObject jsonObject = JSONObject.fromObject(json);
UserBean bean = (UserBean) JSONObject.toBean(jsonObject, UserBean.class);
System.out.println(jsonObject);
理论上，这样就可以了，但时，有异常Caused by: java.lang.NoSuchMethodException: com.json.Json$UserBean.<init>()

3.JSONArray to List
String json = "[\"first\",\"second\"]";
JSONArray jsonArray = (JSONArray) JSONSerializer.toJSON(json);
List output = (List) JSONSerializer.toJava(jsonArray);

4.JSONArray to array
String json = "[\"first\",\"second\"]";
JSONArray jsonArray = (JSONArray) JSONSerializer.toJSON(json);
JsonConfig jsonConfig = new JsonConfig();
jsonConfig.setArrayMode(JsonConfig.MODE_OBJECT_ARRAY);
Object[] output = (Object[]) JSONSerializer.toJava(jsonArray, jsonConfig);
Object[] expected = new Object[] { "first", "second" };
ArrayAssertions.assertEquals(expected, output);

5.JSON 字符串 专为 JavaBean（刘慧斌demo 演示需要的jar包在附件里）

String str="[{\"id\":\"328\",\"mestype\":\"inbox\"},{\"id\":\"327\",\"mestype\":\"inbox\"},{\"id\":\"279\",\"mestype\":\"already\"},{\"id\":\"278\",\"mestype\":\"already\"},{\"id\":\"277\",\"mestype\":\"already\"},{\"id\":\"310\",\"mestype\":\"inbox\"},{\"id\":\"308\",\"mestype\":\"inbox\"},{\"id\":\"305\",\"mestype\":\"inbox\"},{\"id\":\"304\",\"mestype\":\"inbox\"},{\"id\":\"303\",\"mestype\":\"inbox\"}]";
JSONArray jsonArray=(JSONArray) JSONSerializer.toJSON(str);
List list=(List)JSONSerializer.toJava(jsonArray);
for (Object obj: list) {
JSONObject jsonObject = JSONObject.fromObject(obj);
MessageBean bean = (MessageBean) JSONObject.toBean(jsonObject, MessageBean.class);
String id=bean.getId()+"";
String type=bean.getMestype();
System.out.println(id+" "+type);
}
System.out.println(list.size());

http://blog.sina.com.cn/s/blog_9d0ce63d01012vmd.html  JacksonDemo及使用方法


本文依据springside实例，演示Jackson的基本使用方式及大量的特殊Feature.一共13种使用方法。

public class JsonDemo {
 private static JsonMapper mapper = JsonMapper.buildNonDefaultMapper();
 1、序列化对象/集合到Json字符串.
@Test
 public void toJson() throws Exception {
  //Bean
  TestBean bean = new TestBean("A");
  String beanString = mapper.toJson(bean);
  System.out.println("Bean:" + beanString);
  assertEquals("{"name":"A"}", beanString);
  //Map
  Map<String, Object> map = Maps.newLinkedHashMap();
  map.put("name", "A");
  map.put("age", 2);
  String mapString = mapper.toJson(map);
  System.out.println("Map:" + mapString);
  assertEquals("{"name":"A","age":2}", mapString);
  //List<String>
  List<String> stringList = Lists.newArrayList("A", "B", "C");
  String listString = mapper.toJson(stringList);
  System.out.println("String List:" + listString);
  assertEquals("["A","B","C"]", listString);
  //List<Bean>
  List<TestBean> beanList = Lists.newArrayList(new TestBean("A"), new TestBean("B"));
  String beanListString = mapper.toJson(beanList);
  System.out.println("Bean List:" + beanListString);
  assertEquals("[{"name":"A"},{"name":"B"}]", beanListString);
  //Bean[]
  TestBean[] beanArray = new TestBean[] { new TestBean("A"), new TestBean("B") };
  Stri