1.基本使用说明

FastJson常用到一下三个类：

（1）JSON：fastJson的解析器，用于JSON格式字符串与JSON对象及javaBean之间的转换。

（2）JSONObject：fastJson提供的json对象。

（3）JSONArray：fastJson提供json数组对象。

2.案例

public class Student {private String id;@JSONField(name="myName")  //自定义字段名字private String name;@JSONField(serialize=false)  //是否加入到序列化和反序列化中，true为加入，false为不加入，默认为trueprivate Integer age;@JSONField(format="yyyy-MM-dd hh:mm:ss")  //格式化时间字段private Date birthday;private List<Teacher> teacherList;private Teacher teacher;private Map<String, String> data;private List<Map<String, String>> dataList;private Integer sex;private Float weight;public String getId() {return id;}public void setId(String id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public Integer getAge() {return age;}public void setAge(Integer age) {this.age = age;}public Date getBirthday() {return birthday;}public void setBirthday(Date birthday) {this.birthday = birthday;}public List<Teacher> getTeacherList() {return teacherList;}public void setTeacherList(List<Teacher> teacherList) {this.teacherList = teacherList;}public Teacher getTeacher() {return teacher;}public void setTeacher(Teacher teacher) {this.teacher = teacher;}public Map<String, String> getData() {return data;}public void setData(Map<String, String> map) {this.data = map;}public Integer getSex() {return sex;}public void setSex(Integer sex) {this.sex = sex;}public Float getWeight() {return weight;}public void setWeight(Float weight) {this.weight = weight;}public List<Map<String, String>> getDataList() {return dataList;}public void setDataList(List<Map<String, String>> dataList) {this.dataList = dataList;}@Overridepublic String toString() {return "Student{" +"id='" + id + '\'' +", name='" + name + '\'' +", age=" + age +", birthday=" + birthday +", teacherList=" + teacherList +", teacher=" + teacher +", data=" + data +", dataList=" + dataList +", sex=" + sex +", weight=" + weight +'}';}}

public class Teacher {private String id;private String name;private Integer age;public Teacher() {}public Teacher(String id, String name, Integer age) {this.id = id;this.name = name;this.age = age;}public String getId() {return id;}public void setId(String id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public Integer getAge() {return age;}public void setAge(Integer age) {this.age = age;}@Overridepublic String toString() {return "Teacher{" +"id='" + id + '\'' +", name='" + name + '\'' +", age=" + age +'}';}}

public class Main {public static void main(String[] args) {Student stu = new Student();initData(stu);//bean转为json字符串beanToJson(stu);//json字符串转为beanString jsonStr = "{\"age\":25,\"birthday\":1543657701694,\"data\":{\"1\":\"小罗\",\"2\":\"小嘉\",\"3\":\"小敏\"},\"dataList\":[{\"1\":\"小罗\",\"2\":\"小嘉\",\"3\":\"小敏\"},{\"1\":\"小周\",\"2\":\"小蕾\"}],\"id\":\"007\",\"name\":\"小西\",\"sex\":0,\"teacher\":{\"age\":22,\"id\":\"1\",\"name\":\"佳佳\"},\"teacherList\":[{\"age\":22,\"id\":\"1\",\"name\":\"小明\"},{\"age\":22,\"id\":\"2\",\"name\":\"小红\"},{\"age\":22,\"id\":\"3\",\"name\":\"小志\"}],\"weight\":62.5}";jsonToBean(jsonStr);//方式2：json字符串转为beanjsonToBean2(jsonStr);}public static void beanToJson(Student stu) {//解析为json字符串的时候关闭循环引用String jsonStr = JSON.toJSONString(stu, SerializerFeature.DisableCircularReferenceDetect);System.out.println(jsonStr);}public static void jsonToBean(String jsonStr) {/** 两种方式反序列化 **/
//        Student stu = JSON.parseObject(jsonStr, Student.class);Student stu = JSON.parseObject(jsonStr, new TypeReference<Student>(){});System.out.println(stu);}public static void jsonToBean2(String jsonStr) {JSONObject jsonObject = JSON.parseObject(jsonStr);Student stu = JSON.parseObject(jsonObject.toJSONString(), new TypeReference<Student>(){});System.out.println(stu);}public static void initData(Student stu) {stu.setId("007");stu.setName("小西");stu.setAge(25);stu.setBirthday(new Date());stu.setSex(0);stu.setWeight(62.5f);//list集合，set集合一样ArrayList<Teacher> list = new ArrayList<>();list.add(new Teacher("1","小明",22));list.add(new Teacher("2","小红",22));list.add(new Teacher("3","小志",22));stu.setTeacherList(list);//在javaBean中添加javaBeanTeacher teacher = new Teacher("1","佳佳",22);stu.setTeacher(teacher);//添加map集合Map<String, String> map = new HashMap<>();map.put("1", "小罗");map.put("2", "小嘉");map.put("3", "小敏");stu.setData(map);//添加map泛型的listList<Map<String, String>> dataList = new ArrayList<>();Map<String, String> map2 = new HashMap<>();map2.put("1", "小周");map2.put("2", "小蕾");dataList.add(map);dataList.add(map2);stu.setDataList(dataList);}}

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