fastjson在官网的定义号称最小最快 多态的json序列化工具。fastjson采用独创的算法,将parse的速度提升到极致,超过所有json库,包括曾经号称最快的jackson。并且还超越了google的二进制协议protocol buf。
JSON这个类是fastjson API的入口,主要的功能都通过这个类提供。下面是这个类的重要几个方法介绍:
package com.alibaba.fastjson;
public abstract class JSON {
// 将Java对象序列化为JSON字符串,支持各种各种Java基本类型和JavaBean
public static String toJSONString(Object object, SerializerFeature... features);
// 将Java对象序列化为JSON字符串,返回JSON字符串的utf-8 bytes
public static byte[] toJSONBytes(Object object, SerializerFeature... features);
// 将Java对象序列化为JSON字符串,写入到Writer中
public static void writeJSONString(Writer writer,
Object object,
SerializerFeature... features);
// 将Java对象序列化为JSON字符串,按UTF-8编码写入到OutputStream中
public static final int writeJSONString(OutputStream os, //
Object object, //
SerializerFeature... features);
}
package com.alibaba.fastjson;
public abstract class JSON {
// 将JSON字符串反序列化为JavaBean
public static T parseObject(String jsonStr,
Class clazz,
Feature... features);
// 将JSON字符串反序列化为JavaBean
public static T parseObject(byte[] jsonBytes, // UTF-8格式的JSON字符串
Class clazz,
Feature... features);
// 将JSON字符串反序列化为泛型类型的JavaBean
public static T parseObject(String text,
TypeReference type,
Feature... features);
// 将JSON字符串反序列为JSONObject
public static JSONObject parseObject(String text);
}
Demo
import com.alibaba.fastjson.*;
JSONObject jsonObj = JSON.parseObject(jsonStr);
import com.alibaba.fastjson.JSON;
Model model = JSON.parseObject(jsonStr, Model.class);
import com.alibaba.fastjson.JSON;
Type type = new TypeReference>() {}.getType();
List list = JSON.parseObject(jsonStr, type);
import com.alibaba.fastjson.JSON;
Model model = ...;
String jsonStr = JSON.toJSONString(model);
import com.alibaba.fastjson.JSON;
Model model = ...;
byte[] jsonBytes = JSON.toJSONBytes(model);
import com.alibaba.fastjson.JSON;
Model model = ...;
OutputStream os;
JSON.writeJSONString(os, model);
import com.alibaba.fastjson.JSON;
Model model = ...;
Writer writer = ...;
JSON.writeJSONString(writer, model);
总结:
更多关于fastjson的知识可以去w3c去了解:https://www.w3cschool.cn/fastjson/