Java FastJson频繁使用

• public static final Object parse(String text); // 把JSON文本parse为JSONObject或者JSONArray
• *public static final JSONObject parseObject(String text)； // 把JSON文本parse成JSONObject
• *public static final T parseObject(String text, Class clazz); // 把JSON文本parse为JavaBean
• *public static final JSONArray parseArray(String text); // 把JSON文本parse成JSONArray
• *public static final List parseArray(String text, Class clazz); //把JSON文本parse成JavaBean集合
• *public static final String toJSONString(Object object); // 将JavaBean序列化为JSON文本
• public static final String toJSONString(Object object, boolean prettyFormat); // 将JavaBean序列化为带格式的JSON文本
• public static final Object toJSON(Object javaObject); 将JavaBean转换为JSONObject或者JSONArray。

package demo;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Hashtable;
import java.util.List;
import java.util.Map.Entry;
import com.alibaba.fastjson.JSON;

public class P {
    static class Student {
        private long id;
        private String name;
        public long getId() {
            return id;
        }
        public void setId(long id) {
            this.id = id;
        }
        public String getName() {
            return name;
        }
        public void setName(String name) {
            this.name = name;
        }
        @Override
        public String toString() {
            return "Student [id=" + id + ", name=" + name + "]";
        }
        public Student(long id, String name) {
            this.id = id;
            this.name = name;
        }
        public Student() {
        }
    }

    @SuppressWarnings("unlikely-arg-type")
    public static void main(String[] args) {
        Student s1 = new Student(0, "name");
        Student s2 = new Student(2, "name2");
        
        //转为json数组 [{"id":0,"name":"name"},{"id":2,"name":"name2"}]
        ArrayList<Student> list = new ArrayList<>();
        list.add(s1);
        list.add(s2);
        //将集合或者对象序例化成JSON 序号json {"0":{"name":"name","id":0},"1":{"name":"name2","id":2}}
        HashMap<Integer, Student> map = new HashMap<>();
        map.put(0, s1);
        map.put(1, s2);
        //处理json数组 {"studentlist":[{"name":"name","id":0},{"name":"name2","id":2}]}
        Hashtable<String, ArrayList<Student>> hashtable = new Hashtable<>();
        hashtable.put("studentlist", list);
        System.out.println(JSON.toJSONString(list));
        System.out.println(JSON.toJSON(map));
        System.out.println(JSON.toJSON(hashtable));
        // 转换对象 处理map 转对象
        for (Entry<Integer, Student> entry : map.entrySet()) {
            Student value = entry.getValue();
            System.out.println(value.getName());
            System.out.println(value.getId());
        }
        //Json串反序列化成对象
        JSON json = (JSON) JSON.toJSON(s1);
        //注意[ ] 号
        List<Student> parseArray = JSON.parseArray("[{\"id\":0,\"name\":\"name\"},{\"id\":2,\"name\":\"name2\"}]", Student.class);
        //
        for (Student student : parseArray) {
            System.out.println(student.getId());
            System.out.println(student.getName());
        }
    }

}