FastJson的用法
首先定义三个json格式的字符串
//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格式字符串与JSON对象之间的转换
json字符串-简单对象型与JSONObject之间的转换
/**
* json字符串-简单对象型到JSONObject的转换
*/
@Test
public void testJSONStrToJSONObject() {
JSONObject jsonObject = JSONObject.parseObject(JSON_OBJ_STR);
System.out.println("studentName: " + jsonObject.getString("studentName") + ":" + " studentAge: "
+ jsonObject.getInteger("studentAge"));
}
/**
* JSONObject到json字符串-简单对象型的转换
*/
@Test
public void testJSONObjectToJSONStr() {
//已知JSONObject,目标要转换为json字符串
JSONObject jsonObject = JSONObject.parseObject(JSON_OBJ_STR);
// 第一种方式
String jsonString = JSONObject.toJSONString(jsonObject);
// 第二种方式
//String jsonString = jsonObject.toJSONString();
System.out.println(jsonString);
}
复杂json格式字符串与JSONObject之间的转换
/**
* 复杂json格式字符串到JSONObject的转换
*/
@Test
public void testComplexJSONStrToJSONObject() {
JSONObject jsonObject = JSONObject.parseObject(COMPLEX_JSON_STR);
String teacherName = jsonObject.getString("teacherName");
Integer teacherAge = jsonObject.getInteger("teacherAge");
System.out.println("teacherName: " + teacherName + " teacherAge: " + teacherAge);
JSONObject jsonObjectcourse = jsonObject.getJSONObject("course");
//获取JSONObject中的数据
String courseName = jsonObjectcourse.getString("courseName");
Integer code = jsonObjectcourse.getInteger("code");
System.out.println("courseName: " + courseName + " code: " + code);
JSONArray jsonArraystudents = jsonObject.getJSONArray("students");
//遍历JSONArray
for (Object object : jsonArraystudents) {
JSONObject jsonObjectone = (JSONObject) object;
String studentName = jsonObjectone.getString("studentName");
Integer studentAge = jsonObjectone.getInteger("studentAge");
System.out.println("studentName: " + studentName + " studentAge: " + studentAge);
}
}
/**
* 复杂JSONObject到json格式字符串的转换
*/
@Test
public void testJSONObjectToComplexJSONStr() {
//复杂JSONObject,目标要转换为json字符串
JSONObject jsonObject = JSONObject.parseObject(COMPLEX_JSON_STR);
//第一种方式
//String jsonString = JSONObject.toJSONString(jsonObject);
//第二种方式
String jsonString = jsonObject.toJSONString();
System.out.println(jsonString);
}
JSON格式字符串与javaBean之间的转换
json字符串-简单对象型与javaBean之间的转换
/**
* json字符串-简单对象到JavaBean之间的转换
*/
@Test
public void testJSONStrToJavaBeanObj() {
//第一种方式
JSONObject jsonObject = JSONObject.parseObject(JSON_OBJ_STR);
String studentName = jsonObject.getString("studentName");
Integer studentAge = jsonObject.getInteger("studentAge");
//Student student = new Student(studentName, studentAge);
//第二种方式,使用TypeReference<T>类,由于其构造方法使用protected进行修饰,故创建其子类
//Student student = JSONObject.parseObject(JSON_OBJ_STR, new TypeReference<Student>() {});
//第三种方式,使用Gson的思想
Student student = JSONObject.parseObject(JSON_OBJ_STR, Student.class);
System.out.println(student);
}
/**
* JavaBean到json字符串-简单对象的转换
*/
@Test
public void testJavaBeanObjToJSONStr() {
Student student = new Student("lily", 12);
String jsonString = JSONObject.toJSONString(student);
System.out.println(jsonString);
}
json字符串-数组类型与javaBean之间的转换
/**
* json字符串-数组类型到JavaBean_List的转换
*/
@Test
public void testJSONStrToJavaBeanList() {
//第一种方式
JSONArray jsonArray = JSONArray.parseArray(JSON_ARRAY_STR);
//遍历JSONArray
List<Student> students = new ArrayList<Student>();
Student student = null;
for (Object object : jsonArray) {
JSONObject jsonObjectone = (JSONObject) object;
String studentName = jsonObjectone.getString("studentName");
Integer studentAge = jsonObjectone.getInteger("studentAge");
student = new Student(studentName,studentAge);
students.add(student);
}
System.out.println("students: " + students);
//第二种方式,使用TypeReference<T>类,由于其构造方法使用protected进行修饰,故创建其子类
List<Student> studentList = JSONArray.parseObject(JSON_ARRAY_STR, new TypeReference<ArrayList<Student>>() {});
System.out.println("studentList: " + studentList);
//第三种方式,使用Gson的思想
List<Student> studentList1 = JSONArray.parseArray(JSON_ARRAY_STR, Student.class);
System.out.println("studentList1: " + studentList1);
}
/**
* JavaBean_List到json字符串-数组类型的转换
*/
@Test
public void testJavaBeanListToJSONStr() {
Student student = new Student("lily", 12);
Student studenttwo = new Student("lucy", 15);
List<Student> students = new ArrayList<Student>();
students.add(student);
students.add(studenttwo);
String jsonString = JSONArray.toJSONString(students);
System.out.println(jsonString);
}
复杂json格式字符串与与javaBean之间的转换
/**
* 复杂json格式字符串到JavaBean_obj的转换
*/
@Test
public void testComplexJSONStrToJavaBean(){
//第一种方式,使用TypeReference<T>类,由于其构造方法使用protected进行修饰,故创建其子类
Teacher teacher = JSONObject.parseObject(COMPLEX_JSON_STR, new TypeReference<Teacher>() {});
System.out.println(teacher);
//第二种方式,使用Gson思想
Teacher teacher1 = JSONObject.parseObject(COMPLEX_JSON_STR, Teacher.class);
System.out.println(teacher1);
}
/**
* 复杂JavaBean_obj到json格式字符串的转换
*/
@Test
public void testJavaBeanToComplexJSONStr(){
//已知复杂JavaBean_obj
Teacher teacher = JSONObject.parseObject(COMPLEX_JSON_STR, new TypeReference<Teacher>() {});
String jsonString = JSONObject.toJSONString(teacher);
System.out.println(jsonString);
}
javaBean与json对象间的之间的转换
简单javaBean与json对象之间的转换
/**
* 简单JavaBean_obj到json对象的转换
*/
@Test
public void testJavaBeanToJSONObject(){
//已知简单JavaBean_obj
Student student = new Student("lily", 12);
//方式一
String jsonString = JSONObject.toJSONString(student);
JSONObject jsonObject = JSONObject.parseObject(jsonString);
System.out.println(jsonObject);
//方式二
JSONObject jsonObject1 = (JSONObject) JSONObject.toJSON(student);
System.out.println(jsonObject1);
}
/**
* 简单json对象到JavaBean_obj的转换
*/
@Test
public void testJSONObjectToJavaBean(){
//已知简单json对象
JSONObject jsonObject = JSONObject.parseObject(JSON_OBJ_STR);
//第一种方式,使用TypeReference<T>类,由于其构造方法使用protected进行修饰,故创建其子类
Student student = JSONObject.parseObject(jsonObject.toJSONString(), new TypeReference<Student>() {});
System.out.println(student);
//第二种方式,使用Gson的思想
Student student1 = JSONObject.parseObject(jsonObject.toJSONString(), Student.class);
System.out.println(student1);
}
JavaList与JsonArray之间的转换
/**
* JavaList到JsonArray的转换
*/
@Test
public void testJavaListToJsonArray() {
//已知JavaList
Student student = new Student("lily", 12);
Student studenttwo = new Student("lucy", 15);
List<Student> students = new ArrayList<Student>();
students.add(student);
students.add(studenttwo);
//方式一
String jsonString = JSONArray.toJSONString(students);
JSONArray jsonArray = JSONArray.parseArray(jsonString);
System.out.println(jsonArray);
//方式二
JSONArray jsonArray1 = (JSONArray) JSONArray.toJSON(students);
System.out.println(jsonArray1);
}
/**
* JsonArray到JavaList的转换
*/
@Test
public void testJsonArrayToJavaList() {
//已知JsonArray
JSONArray jsonArray = JSONArray.parseArray(JSON_ARRAY_STR);
//第一种方式,使用TypeReference<T>类,由于其构造方法使用protected进行修饰,故创建其子类
ArrayList<Student> students = JSONArray.parseObject(jsonArray.toJSONString(),
new TypeReference<ArrayList<Student>>() {});
System.out.println(students);
//第二种方式,使用Gson的思想
List<Student> students1 = JSONArray.parseArray(jsonArray.toJSONString(), Student.class);
System.out.println(students1);
}
复杂JavaBean_obj与json对象之间的转换
/**
* 复杂JavaBean_obj到json对象的转换
*/
@Test
public void testComplexJavaBeanToJSONObject() {
//已知复杂JavaBean_obj
Student student = new Student("lily", 12);
Student studenttwo = new Student("lucy", 15);
List<Student> students = new ArrayList<Student>();
students.add(student);
students.add(studenttwo);
Course course = new Course("english", 1270);
Teacher teacher = new Teacher("crystall", 27, course, students);
//方式一
String jsonString = JSONObject.toJSONString(teacher);
JSONObject jsonObject = JSONObject.parseObject(jsonString);
System.out.println(jsonObject);
//方式二
JSONObject jsonObject1 = (JSONObject) JSONObject.toJSON(teacher);
System.out.println(jsonObject1);
}
/**
* 复杂json对象到JavaBean_obj的转换
*/
@Test
public void testComplexJSONObjectToJavaBean() {
//已知复杂json对象
JSONObject jsonObject = JSONObject.parseObject(COMPLEX_JSON_STR);
//第一种方式,使用TypeReference<T>类,由于其构造方法使用protected进行修饰,故创建其子类
Teacher teacher = JSONObject.parseObject(jsonObject.toJSONString(), new TypeReference<Teacher>() {});
System.out.println(teacher);
//第二种方式,使用Gson的思想
Teacher teacher1 = JSONObject.parseObject(jsonObject.toJSONString(), Teacher.class);
System.out.println(teacher1);
}
