基于json-lib.jar包 JSONObject-Java常用的四种用法

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());

评论

1 楼 gqzyyxh 2010-10-28  

你好，请问下
commons-logging.jar,commons-lang-2.3.jar,
commons-collections-3.2.jar,commons-beanutils.jar，这四个jar包有什么作用呢，我只用到了json-lib-2.2.3-jdk15.jar和ezmorph-1.0.4.jar这2个jar包。想先了解下，以后遇到错误就不头疼了。另外我看到公司的SSH框架的系统里还有
json-lib-ext-spring-1.0.1.jar这个jar包，是做什么的呢？期待你的解答，谢谢~