高性能JSON 框架之fastJSON

目錄

1.FastJson的介紹:

JSON協議使用方便，越來越流行,JSON的處理器有很多,這裏我介紹一下FastJson,FastJson是阿里的開源框架,被不少企業使用,是一個極其優秀的Json框架,Github地址

2.FastJson的特點:

1.FastJson數度快,無論序列化和反序列化,都是當之無愧的fast 
2.功能強大(支持普通JDK類包括任意Java Bean Class、Collection、Map、Date或enum) 
3.零依賴(沒有依賴其它任何類庫)

3.FastJson的簡單說明:

FastJson對於json格式字符串的解析主要用到了下面三個類： 
1.JSON：fastJson的解析器，用於JSON格式字符串與JSON對象及javaBean之間的轉換 
2.JSONObject：fastJson提供的json對象 
3.JSONArray：fastJson提供json數組對象

4.FastJson的用法

首先定義三個json格式的字符串

        private static final String JSON_OBJ_STR = "{\"studentName\":\"lily\",\"studentAge\":12}";

	private static final String JSON_ARRAY_STR = "[{\"studentName\":\"lily\",\"studentAge\":12},{\"studentName\":\"lucy\",\"studentAge\":15}]";

	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-簡單對象型到JSONObject的轉換
	 */
	@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-簡單對象型的轉換
	 */
	@Test
	public void testJSONObjectToJSONStr() {
		//將string 轉換爲  JSONObject
		JSONObject jsonObject = JSONObject.parseObject(JSON_OBJ_STR);
		//第一種方式
		String jsonString = JSONObject.toJSONString(jsonObject);
		System.out.println("第一種方式：" + jsonString);
		//第二種方式
		String jsonString2 = jsonObject.toJSONString();
		System.out.println("第二種方式：" + jsonString2);
	}

	/**
	 * json字符串-數組類型到JSONArray的轉換
	 */
	@Test
	public void testJSONStrToJSONArray() {
		JSONArray jsonArray = JSONArray.parseArray(JSON_ARRAY_STR);
		//遍歷方式
		int size = jsonArray.size();
		System.out.println("==========第一種遍歷方式============");
		for (int i = 0; i < size; i++) {
			JSONObject jsonObject = jsonArray.getJSONObject(i);
			System.out.println("studentName : " + jsonObject.getString("studentName") + ":" + "  studentAge:  "
				+ jsonObject.getInteger("studentAge"));
		}
		//遍歷方式2
		System.out.println("==========第二種遍歷方式============");
		for (Object obj : jsonArray) {
			JSONObject jsonObject = (JSONObject) obj;
			System.out.println("studentName:  " + jsonObject.getString("studentName") + ":" + "  studentAge:  "
				+ jsonObject.getInteger("studentAge"));
		}

	}

	/**
	 * JSONArray到json字符串-數組類型的轉換
	 */
	@Test
	public void testJSONArrayToJSONStr() {
		//已知JSONArray,目標要轉換爲json字符串
		JSONArray jsonArray = JSONArray.parseArray(JSON_ARRAY_STR);
		//第一種方式
		System.out.println("==========第一種遍歷方式============");
		String jsonString = JSONArray.toJSONString(jsonArray);
		System.out.println(jsonString);
		//第二種方式
		System.out.println("==========第二種遍歷方式============");
		String jsonString2 = jsonArray.toJSONString(jsonArray);
		System.out.println(jsonString2);
	}


	/**
	 * 複雜json格式字符串到JSONObject的轉換
	 */
	@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");
		//獲取JSONObject 中的數據
		String courseName = jsonObjectcourse.getString("courseName");
		Integer code = jsonObjectcourse.getInteger("code");
		System.out.println("courseName: " + courseName + " code: " + code);
		JSONArray jsonArrayStudents = jsonObject.getJSONArray("students");
		//遍歷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);
		}
	}

	/**
	 * 複雜JSONObject到json格式字符串的轉換
	 */
	@Test
	public void testJSONObjectToComplexJSONStr() {
		//複雜JSONObject ，目標要轉換爲json 字符串
		JSONObject jsonObject = JSONObject.parseObject(COMPLEX_JSON_STR);
		//第一種方式
		String jsonString = JSONObject.toJSONString(jsonObject);
		System.out.println(jsonString);
		//第二種方式
		String jsonString2 = jsonObject.toJSONString();
		System.out.println(jsonString2);
	}

	/**
	 * json字符串-簡單對象到JavaBean之間的轉換
	 */
	@Test
	public void testJSONStrToJavaBeanObj() {
		//第一種方式
		JSONObject jsonObject = JSONObject.parseObject(JSON_OBJ_STR);
		String studentName = jsonObject.getString("studentName");
		Integer studentAge = jsonObject.getInteger("studentAge");
		Student student1 = new Student(studentName, studentAge);
		System.out.println(student1);
		//第二種方式,使用TypeReference<T>類,由於其構造方法使用protected進行修飾,故創建其子類
		Student student2 = JSONObject.parseObject(JSON_OBJ_STR, new TypeReference<Student>() {
		});
		System.out.println(student2);
		//第三種方式,使用Gson的思想
		Student student3 = JSONObject.parseObject(JSON_OBJ_STR, Student.class);
		System.out.println(student3);
	}

	/**
	 * JavaBean到json字符串-簡單對象的轉換
	 */
	@Test
	public void testJavaBeanObjToJSONStr() {
		Student student = new Student("jack", 21);
		String jsonString = JSONObject.toJSONString(student);
		System.out.println(jsonString);
	}

	/**
	 * json字符串-數組類型到JavaBean_List的轉換
	 */
	@Test
	public void testJSONStrToJavaBeanList() {
		//第一種方式
		JSONArray jsonArray = JSONArray.parseArray(JSON_ARRAY_STR);
		//遍歷JSONArray
		List<Student> students = new ArrayList<>();
		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);
		//第二種方式,使用TypeReference<T>類,由於其構造方法使用protected進行修飾,故創建其子類
		List<Student> studentList = JSONArray.parseObject(JSON_ARRAY_STR, new TypeReference<ArrayList<Student>>() {
		});
		System.out.println("studentList:  " + studentList);

		//第三種方式,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-數組類型的轉換
	 */
	@Test
	public void testJavaBeanListToJSONStr() {
		Student student = new Student("jack", 12);
		Student studentTwo = new Student("rows", 13);
		List<Student> students = new ArrayList<>();
		students.add(student);
		students.add(studentTwo);
		String jsonString = JSONArray.toJSONString(students);
		System.out.println(jsonString);
	}

	/**
	 * 複雜json格式字符串到JavaBean_obj的轉換
	 */
	@Test
	public void testComplexJSONStrToJavaBean() {
		//第一種方式 使用  TypeReference<T>類,由於其構造方法使用protected進行修飾,故創建其子類
		Teacher teacher = JSONObject.parseObject(COMPLEX_JSON_STR, new TypeReference<Teacher>() {
		});
		System.out.println(teacher);

		//第二種方式,使用Gson思想
		Teacher teacher1 = JSONObject.parseObject(COMPLEX_JSON_STR, Teacher.class);
		System.out.println(teacher1);
	}

	/**
	 * 複雜JavaBean_obj到json格式字符串的轉換
	 */
	@Test
	public void testJavaBeanToComplexJSONStr() {
		//已知複雜JavaBean_obj
		Teacher teacher = JSONObject.parseObject(COMPLEX_JSON_STR, new TypeReference<Teacher>() {
		});
		String jsonString = JSONObject.toJSONString(teacher);
		System.out.println(jsonString);
	}

	/**
	 * 簡單JavaBean_obj到json對象的轉換
	 */
	@Test
	public void testJavaBeanToJSONObject() {
		//已知簡單JavaBean_obj
		Student student = new Student("lily", 12);

		//方式一
		String jsonString = JSONObject.toJSONString(student);
		JSONObject jsonObject = JSONObject.parseObject(jsonString);
		System.out.println("方式一:" + jsonObject);

		//方式二
		JSONObject jsonObject1 = (JSONObject) JSONObject.toJSON(student);
		System.out.println("方式二:" + jsonObject1);
	}

	/**
	 * 簡單json對象到JavaBean_obj的轉換
	 */
	@Test
	public void testJSONObjectToJavaBean() {
		//已知簡單json對象
		JSONObject jsonObject = JSONObject.parseObject(JSON_OBJ_STR);

		//第一種方式,使用TypeReference<T>類,由於其構造方法使用protected進行修飾,故創建其子類
		Student student = JSONObject.parseObject(jsonObject.toJSONString(), new TypeReference<Student>() {
		});
		System.out.println(student);

		//第二種方式,使用Gson的思想
		Student student1 = JSONObject.parseObject(jsonObject.toJSONString(), Student.class);
		System.out.println(student1);
	}

	/**
	 * JavaList到JsonArray的轉換
	 */
	@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("方式一:" + jsonArray);
		//方式二
		JSONArray jsonArray1 = (JSONArray) JSONArray.toJSON(students);
		System.out.println("方式二" + jsonArray1);
	}

	/**
	 * JsonArray到JavaList的轉換
	 */
	@Test
	public void testJsonArrayToJavaList() {
		//已知JsonArray
		JSONArray jsonArray = JSONArray.parseArray(JSON_ARRAY_STR);
		//第一種方式,使用TypeReference<T>類,由於其構造方法使用protected進行修飾,故創建其子類
		ArrayList<Student> students = JSONArray.parseObject(jsonArray.toJSONString(),
			new TypeReference<ArrayList<Student>>() {
			});
		System.out.println(students);
		//第二種方式,使用Gson的思想
		List<Student> students1 = JSONArray.parseArray(jsonArray.toJSONString(), Student.class);
		System.out.println(students1);
	}

	/**
	 * 複雜JavaBean_obj到json對象的轉換
	 */
	@Test
	public void testComplexJavaBeanToJSONObject() {
		//已知複雜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);
	}

	/**
	 * 複雜json對象到JavaBean_obj的轉換
	 */
	@Test
	public void testComplexJSONObjectToJavaBean() {
		//已知複雜json對象
		JSONObject jsonObject = JSONObject.parseObject(COMPLEX_JSON_STR);

		//第一種方式,使用TypeReference<T>類,由於其構造方法使用protected進行修飾,故創建其子類
		Teacher teacher = JSONObject.parseObject(jsonObject.toJSONString(), new TypeReference<Teacher>() {
		});
		System.out.println(teacher);

		//第二種方式,使用Gson的思想
		Teacher teacher1 = JSONObject.parseObject(jsonObject.toJSONString(), Teacher.class);
		System.out.println(teacher1);
	}

實體類：Teacher

import java.io.Serializable;
import java.util.List;

public class Teacher implements Serializable {

	private String teacherName;
	private Integer teacherAge;
	private Course course;
	private List<Student> students;

	public Teacher() {
	}

	public Teacher(String teacherName, Integer teacherAge, Course course, List<Student> students) {
		this.teacherName = teacherName;
		this.teacherAge = teacherAge;
		this.course = course;
		this.students = 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;
	}


	@Override
	public String toString() {
		return "Teacher{" +
			"teacherName='" + teacherName + '\'' +
			", teacherAge=" + teacherAge +
			", course=" + course +
			", students=" + students +
			'}';
	}
}

實體類：Student

import java.io.Serializable;

public class Student implements Serializable {
	private String studentName;
	private Integer studentAge;

	public Student() {
	}

	public Student(String studentName, Integer studentAge) {
		this.studentName = studentName;
		this.studentAge = 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;
	}

	@Override
	public String toString() {
		return "Student{" +
			"studentName='" + studentName + '\'' +
			", studentAge=" + studentAge +
			'}';
	}
}

實體類：Course

import java.io.Serializable;

public class Course implements Serializable {
	private String courseName;
	private Integer code;

	public Course() {
	}

	public Course(String courseName, Integer code) {
		this.courseName = courseName;
		this.code = 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;
	}

	@Override
	public String toString() {
		return "Course{" +
			"courseName='" + courseName + '\'' +
			", code=" + code +
			'}';
	}
}

實體類：Tutor

import java.io.Serializable;

public class Tutor implements Serializable {
	private Integer tutorId;
	private String name;
	private String email;

	public Tutor() {
	}

	public Tutor(String name, String email) {
		this.name = name;
		this.email = email;
	}

	public Tutor(Integer tutorId, String name, String email) {
		this.tutorId = tutorId;
		this.name = name;
		this.email = email;
	}


	public Integer getTutorId() {
		return tutorId;
	}

	public void setTutorId(Integer tutorId) {
		this.tutorId = tutorId;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public String getEmail() {
		return email;
	}

	public void setEmail(String email) {
		this.email = email;
	}

	@Override
	public String toString() {
		return "Tutor{" +
			"tutorId=" + tutorId +
			", name='" + name + '\'' +
			", email='" + email + '\'' +
			'}';
	}
}

結束。。。。。。