bean与json之间转换

1.json依赖
<dependency>
    <groupId>org.json</groupId>
    <artifactId>json</artifactId>
    <version>20160810</version>
</dependency>

Student student = new Student();
student.setId(1);
student.setName("zhangsan");

/**  把java 对象转换成 json 数据
 *   1.转成json对象
 *   2.转成json字符串
 */
JSONObject jsonObject = JSONObject.fromObject(student);
String string = jsonObject.toString();
System.out.println("json数据"+string);
/**
 * json 对象  转 java 对象
 */
JSONObject json = new JSONObject();
json.put("id",2);
json.put("name","lisi");
Student bean = (Student) JSONObject.toBean(json, Student.class);
System.out.println("bean:id"+bean.getId()+"name"+bean.getName());
/**
 * json对象转成指定的list
 */
JSONObject json2 = new JSONObject();
Student student2 = new Student();
student2.setId(3);
student2.setName("wangwu");
Student student3 = new Student();
student3.setId(4);
student3.setName("wangxiaoming");
List<Student> list = new ArrayList();
list.add(student2);
list.add(student3);
json2.put("students",list);
JSONArray students = (JSONArray)json2.get("students");
List<Student> list2 = JSONArray.toList(students, new Student(), new JsonConfig());
System.out.println("json转list:"+list2.get(1).getName());
//list 转json数据

JSONArray array = JSONArray.fromObject(list);
System.out.println("list转json:"+array);

2.<!--json-->  fastjson
<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>fastjson</artifactId>
    <version>1.2.47</version>
</dependency>
1. JsonToBean   JSON.parseObject(String jsonData, Student.class)
Student student= Json.parseObject(data, Student.class);
2. BeanToJson JSON.toJSONString(object)
String json=JSON.toJSONString(student);
3.JsonToList JSON.parseArray(String jsonData, Student.class)
List<Student> list= JSON.parseArray(data, Student.class);