//json字符串-简单对象型
private static final String  JSON_OBJ_STR = "{\"studentName\":\"lily\",\"studentAge\":12}";
//json字符串-数组类型
private static final String  JSON_ARRAY_STR = "[{\"studentName\":\"lily\",\"studentAge\":12},{\"studentName\":\"lucy\",\"studentAge\":15}]";
//复杂格式json字符串
private static final String  COMPLEX_JSON_STR = "{\"teacherName\":\"crystall\",\"teacherAge\":27,\"course\":{\"courseName\":\"english\",\"code\":1270},\"students\":[{\"studentName\":\"lily\",\"studentAge\":12},{\"studentName\":\"lucy\",\"studentAge\":15}]}";

    /*** json字符串-简单对象型与JSONObject之间的转换*/public static void testJSONStrToJSONObject(){JSONObject jsonObject = JSON.parseObject(JSON_OBJ_STR);//JSONObject jsonObject1 = JSONObject.parseObject(JSON_OBJ_STR); //因为JSONObject继承了JSON，所以这样也是可以的
System.out.println(jsonObject.getString("studentName")+":"+jsonObject.getInteger("studentAge"));}

    /*** json字符串-数组类型与JSONArray之间的转换*/public static void testJSONStrToJSONArray(){JSONArray jsonArray = JSON.parseArray(JSON_ARRAY_STR);//JSONArray jsonArray1 = JSONArray.parseArray(JSON_ARRAY_STR);//因为JSONArray继承了JSON，所以这样也是可以的//遍历方式1int size = jsonArray.size();for (int i = 0; i < size; i++){JSONObject jsonObject = jsonArray.getJSONObject(i);System.out.println(jsonObject.getString("studentName")+":"+jsonObject.getInteger("studentAge"));}//遍历方式2for (Object obj : jsonArray) {JSONObject jsonObject = (JSONObject) obj;System.out.println(jsonObject.getString("studentName")+":"+jsonObject.getInteger("studentAge"));}}

    /*** 复杂json格式字符串与JSONObject之间的转换*/public static void testComplexJSONStrToJSONObject(){JSONObject jsonObject = JSON.parseObject(COMPLEX_JSON_STR);//JSONObject jsonObject1 = JSONObject.parseObject(COMPLEX_JSON_STR);//因为JSONObject继承了JSON，所以这样也是可以的
        String teacherName = jsonObject.getString("teacherName");Integer teacherAge = jsonObject.getInteger("teacherAge");JSONObject course = jsonObject.getJSONObject("course");JSONArray students = jsonObject.getJSONArray("students");}

public class Student {private String studentName;private Integer studentAge;public String getStudentName() {return studentName;}public void setStudentName(String studentName) {this.studentName = studentName;}public Integer getStudentAge() {return studentAge;}public void setStudentAge(Integer studentAge) {this.studentAge = studentAge;}
}

public class Course {private String courseName;private Integer code;public String getCourseName() {return courseName;}public void setCourseName(String courseName) {this.courseName = courseName;}public Integer getCode() {return code;}public void setCode(Integer code) {this.code = code;}
}

public class Teacher {private String teacherName;private Integer teacherAge;private Course course;private List<Student> students;public String getTeacherName() {return teacherName;}public void setTeacherName(String teacherName) {this.teacherName = teacherName;}public Integer getTeacherAge() {return teacherAge;}public void setTeacherAge(Integer teacherAge) {this.teacherAge = teacherAge;}public Course getCourse() {return course;}public void setCourse(Course course) {this.course = course;}public List<Student> getStudents() {return students;}public void setStudents(List<Student> students) {this.students = students;}
}

   /*** json字符串-简单对象与JavaBean_obj之间的转换*/public static void testJSONStrToJavaBeanObj(){Student student = JSON.parseObject(JSON_OBJ_STR, Student.class);System.out.println(student.getStudentName()+":"+student.getStudentAge());}

/*** json字符串-数组类型与JavaBean_List之间的转换*/public static void testJSONStrToJavaBeanList(){ArrayList<Student> students = JSON.parseObject(JSON_ARRAY_STR, new TypeReference<ArrayList<Student>>() {});//ArrayList<Student> students1 = JSONArray.parseObject(JSON_ARRAY_STR, new TypeReference<ArrayList<Student>>() {});//因为JSONArray继承了JSON，所以这样也是可以的for (Student student : students) {System.out.println(student.getStudentName()+":"+student.getStudentAge());}}

    /*** 复杂json格式字符串与JavaBean_obj之间的转换*/public static void testComplexJSONStrToJavaBean(){Teacher teacher = JSON.parseObject(COMPLEX_JSON_STR, new TypeReference<Teacher>() {});//Teacher teacher1 = JSON.parseObject(COMPLEX_JSON_STR, new TypeReference<Teacher>() {});//因为JSONObject继承了JSON，所以这样也是可以的String teacherName = teacher.getTeacherName();Integer teacherAge = teacher.getTeacherAge();Course course = teacher.getCourse();List<Student> students = teacher.getStudents();}