java实体对象转换成json

public static patient requestInfo(AppUser appuser,patient patient){
		Map<String, Object> map = new HashMap<String, Object>();
		List<Map<String, Object>> list = new ArrayList<Map<String, Object>>();
		Map<String, Object> map1 = new HashMap<String, Object>();
		List<Map<String, Object>> list1 = new ArrayList<Map<String, Object>>();
		
		//生日
		patient.setBirthDate(appuser.getBirthday());
		//姓名
		map.put("text", appuser.getRealname());
		list.add(map);
		patient.setName(list);
		//性别
		patient.setGender(appuser.getGender().toString());
		//身份证
		map1.put("system", "urn:oid:2.16.156.10011.1.3");
		map1.put("value", appuser.getIdNumber());
		list1.add(map1);
		patient.setIdentifier(list1);
		System.out.println("转换的对象===============》"+patient.toString());
		JSONObject json = new JSONObject().fromObject(patient);
		System.out.println("转换的json===============》"+json);
		return patient;
		
	}
}

JSONObject  引用的是net.sf.json.JSONObject这个包下的

  返回结果为

转换的json===============》patient [resourceType=null, extension=null, identifier=[{system=urn:oid:2.16.156.10011.1.3, value=130182199502165719}], name=[{text=猩红收割者1}], telecom=null, gender=0, birthDate=19950216, address=null, maritalStatus=null, contact=null]

转换的json===============》{"address":[],"birthDate":"19950216","contact":[],"extension":[],"gender":"0","identifier":[{"system":"urn:oid:2.16.156.10011.1.3","value":"130182199502165719"}],"maritalStatus":[],"name":[{"text":"猩红收割者1"}],"resourceType":"","telecom":[]}