json解析初学案例demo

 
public class TestJson {
	
	/**
	 * json对象 与  java对象 转换
	 */
	@Test
	public void test1(){
		//创建  Studnet 对象 -> s1
		Student s1 = new Student();
		s1.setAge(22);
		s1.setName("fuck");
		s1.setScore(91.0);
		//将 s1 对象 放入 list
		List<Student> list = new ArrayList<Student>();
		list.add(s1);
		System.out.println("************************************");
		//将 list转为 JSONArray
		JSONArray array = JSONArray.fromObject(list);
		System.out.println(array.toString());
		System.out.println("************************************");
		//将 s1 转为 JSONArray
		JSONArray array2 = JSONArray.fromObject(s1);
		System.out.println(array2.toString());
		System.out.println("************************************");
		//将 s1 转为 JSONObject
		JSONObject object = JSONObject.fromObject(s1);
		System.out.println(object);
		System.out.println("************************************");
		//将 object 转回为 Student 对象
		Student student = (Student) JSONObject.toBean(object, Student.class);
		System.out.println("Student: "+student.getAge());
		System.out.println("************************************");
		//将 JSONArray 转为 list
		List<Student> list2 = JSONArray.toList(array2);
		System.out.println(list2);
	}
 
	
	
	/**
	 * 创建一个 JSONObject 
	 * 并 得到 json 里的数据
	 */
	@Test
	public void test2(){
		JSONObject object = new JSONObject();
		object.put(1, "hao");
		object.put(2, "good");
		object.put(3, "544");
		object.put(4, "you");
		System.out.println(object.getInt("3"));
		System.out.println(object.getString("4"));
		
	}
	
	/**
	 * 解析一个json  文件来源 - testjson.txt
	 * 文件内容:
	 * 		  {"name":"luxury","age":"24","from":"Beijing","birthday":"1991-10-29 
			  19:00","go":[{"GouBangZi":"love","anhui":"home"}],"for":"some love"}
	 * @throws IOException 
	 */
	@Test
	public void test3() throws IOException{
		//将文件内容读入文件流
		FileInputStream fis = new FileInputStream("R:\\testjson.txt");
		BufferedReader br = new BufferedReader(new InputStreamReader(fis));
		String result = "";
		String line = "";
		//读取内容
		while((line=br.readLine())!=null){
			result = result + line ;
		}
		fis.close();
		br.close();
		//创建 JSONObject fromObject:从文件读取的内容
		JSONObject obj = JSONObject.fromObject(result);
		System.out.println(obj.toString());
		System.out.println(obj.getString("from"));
		System.out.println("**************************");
 
		//jsonArray 里 还有一个 jsonObject
		JSONArray arr = obj.getJSONArray("go");
		System.out.println("arr: "+arr);
		System.out.println(arr.getJSONObject(0));
		
	}
	
	
	/**
	 * 一般数组 转化为 json
	 */
	@Test
	public void test4(){
		boolean[] boo = new boolean[]{false,true,false,true};
		// boo 是数组 所以 转化为 JSONArray
		JSONArray obj = JSONArray.fromObject(boo);
		System.out.println(obj);
		
	}
	
	
	/**
	 * 字符串-json  转成 JSONObject
	 */
	@Test
	public void test5(){
		String json = "{'who':'me','what':[{'way':'fuck you'}],'where':'now'}";
		JSONObject obj = JSONObject.fromObject(json);
		System.out.println(obj);
		
		System.out.println("************************");
		JSONArray arr = obj.getJSONArray("what");
		System.out.println(arr);
		System.out.println(arr.getJSONObject(0));
		System.out.println(arr.getJSONObject(0).getString("way"));
		
	}
	
}