云南大王-使用Fastjson实现JSON与JavaBean之间互相转换
发布时间：2020-04-13 00:00:00
原文链接：http://www.yiidian.com/fastjson/fastjson-json-javabean.html
1 简单JSON与JavaBean的转换
1.1 设计Student实体类
package com.yiidian.domain;
/**
* 一点教程网 - http://www.yiidian.com
*/
public class Student {
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 +
'}';
}
}
1.2 简单JSON转为JavaBean
MainApp：
package com.yiidian.fastjson;
import com.alibaba.fastjson.JSONObject;
import com.yiidian.domain.Student;
/**
* 一点教程网 - http://www.yiidian.com
*/
public class MainApp {
public static void main(String args[]){
String JSON_OBJ_STR = "{\"studentName\":\"lily\",\"studentAge\":12}";
Student student = JSONObject.parseObject(JSON_OBJ_STR, Student.class);
System.out.println(student);
}
}
运行效果为：
Student{studentName='lily', studentAge=12}
1.3 JavaBean转为简单JSON
MainApp：
package com.yiidian.fastjson;
import com.alibaba.fastjson.JSONObject;
import com.yiidian.domain.Student;
/**
* 一点教程网 - http://www.yiidian.com
*/
public class MainApp {
public static void main(String args[]){
Student student = new Student("lily", 12);
String jsonString = JSONObject.toJSONString(student);
System.out.println(jsonString);
}
}
运行效果为：
{"studentAge":12,"studentName":"lily"}
2 JSON数组与JavaBean的转换
2.1 JSON数组转为JavaBean
MainApp：
package com.yiidian.fastjson;
import com.alibaba.fastjson.JSONArray;
import com.yiidian.domain.Student;
import java.util.List;
/**
* 一点教程网 - http://www.yiidian.com
*/
public class MainApp {
public static void main(String args[]){
String JSON_ARRAY_STR = "[{\"studentName\":\"lily\",\"studentAge\":12},{\"studentName\":\"lucy\",\"studentAge\":15}]";
List studentList = JSONArray.parseArray(JSON_ARRAY_STR, Student.class);
System.out.println("studentList: " + studentList);
}
}
运行结果为：
studentList: [Student{studentName='lily', studentAge=12}, Student{studentName='lucy', studentAge=15}]
2.2 JavaBean转为JSON数组
MainApp：
package com.yiidian.fastjson;
import com.alibaba.fastjson.JSONArray;
import com.yiidian.domain.Student;
import java.util.ArrayList;
import java.util.List;
/**
* 一点教程网 - http://www.yiidian.com
*/
public class MainApp {
public static void main(String args[]){
Student student = new Student("lily", 12);
Student studenttwo = new Student("lucy", 15);
List students = new ArrayList();
students.add(student);
students.add(studenttwo);
String jsonString = JSONArray.toJSONString(students);
System.out.println(jsonString);
}
}
运行效果为：
[{"studentAge":12,"studentName":"lily"},{"studentAge":15,"studentName":"lucy"}]
3 复杂JSON与JavaBean的转换
3.1 设计Course实体类
package com.yiidian.domain;
import java.util.List;
/**
* 一点教程网 - http://www.yiidian.com
*/
public class Course {
private String courseName;
private String code;
public String getCourseName() {
return courseName;
}
public void setCourseName(String courseName) {
this.courseName = courseName;
}
public String getCode() {
return code;
}
public void setCode(String code) {
this.code = code;
}
@Override
public String toString() {
return "Course{" +
"courseName='" + courseName + '\'' +
", code='" + code + '\'' +
'}';
}
}
3.2 设计Teacher实体类
package com.yiidian.domain;
import java.util.List;
/**
* 一点教程网 - http://www.yiidian.com
*/
public class Teacher {
private String teacherName;
private Integer teacherAge;
private Course course;
private List 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 getStudents() {
return students;
}
public void setStudents(List students) {
this.students = students;
}
@Override
public String toString() {
return "Teacher{" +
"teacherName='" + teacherName + '\'' +
", teacherAge=" + teacherAge +
", course=" + course +
", students=" + students +
'}';
}
}
3.3 复杂JSON转为JavaBean
MainApp：
package com.yiidian.fastjson;
import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;
import com.yiidian.domain.Student;
import com.yiidian.domain.Teacher;
import java.util.ArrayList;
import java.util.List;
/**
* 一点教程网 - http://www.yiidian.com
*/
public class MainApp {
public static void main(String args[]){
String COMPLEX_JSON_STR = "{\"teacherName\":\"crystall\",\"teacherAge\":27,\"course\":{\"courseName\":\"english\",\"code\":1270},\"students\":[{\"studentName\":\"lily\",\"studentAge\":12},{\"studentName\":\"lucy\",\"studentAge\":15}]}";
Teacher teacher = JSONObject.parseObject(COMPLEX_JSON_STR, Teacher.class);
System.out.println(teacher);
}
}
运行效果为：
Teacher{teacherName='crystall', teacherAge=27, course=Course{courseName='english', code='1270'}, students=[Student{studentName='lily', studentAge=12}, Student{studentName='lucy', studentAge=15}]}
3.3 JavaBean转为复杂JSON
MainApp：
package com.yiidian.fastjson;
import com.alibaba.fastjson.JSONObject;
import com.yiidian.domain.Teacher;
/**
* 一点教程网 - http://www.yiidian.com
*/
public class MainApp {
public static void main(String args[]){
String COMPLEX_JSON_STR = "{\"teacherName\":\"crystall\",\"teacherAge\":27,\"course\":{\"courseName\":\"english\",\"code\":1270},\"students\":[{\"studentName\":\"lily\",\"studentAge\":12},{\"studentName\":\"lucy\",\"studentAge\":15}]}";
Teacher teacher = JSONObject.parseObject(COMPLEX_JSON_STR, Teacher.class);
String jsonString = JSONObject.toJSONString(teacher);
System.out.println(jsonString);
}
}
运行效果为：
{"course":{"code":"1270","courseName":"english"},"students":[{"studentAge":12,"studentName":"lily"},{"studentAge":15,"studentName":"lucy"}],"teacherAge":27,"teacherName":"crystall"}
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