Jackson, gson, fastjson

1, jackson usage

(1) create ObjectMapper objects (reusable objects)

  ObjectMapper om=new ObjectMapper();

(2) the object to deserialize

Student stu=om.readValue(jsonString,Student.class);

(3) a serialized object to json

JsonString jstr=om.writeValueAsString(stu);

JsonString jstr=om.writeValue(Io流,stu);

例writer w=newStringWrite（）;

   OutputStream ot=new OutPutStream（）；

2, Ali's fastest fastJson

(1) serialized ApI

package com.alibaba.fastjson; public abstract class JSON {

// Java objects serialized as JSON strings, supports a variety of types and various Java basic JavaBean

public static String toJSONString(Object object,

                                                     SerializerFeature... features);

// The Java object serialization to JSON string, the string of JSON utf-8 bytes

public static byte[] toJSONBytes(Object object, 

                                                    SerializerFeature... features);

// Java objects serialized to JSON string is written into a Writer

public static void writeJSONString(Writer writer,

                                                       Object object,

                                                       SerializerFeature... features);

// The Java object serialization to JSON string written into the OutputStream encoded by UTF-8

public static final int writeJSONString(OutputStream os, //

                                                           Object object, //

                                                          SerializerFeature... features); }

(2) JSON API string deserialization

package com.alibaba.fastjson; public abstract class JSON {

// deserialize JSON string JavaBean

public static <T> T parseObject(String jsonStr, Class<T> clazz, Feature... features);

// deserialize JSON string JavaBean

public static <T> T parseObject(byte[] jsonBytes,

// UTF-8 format string JSON Class <T> clazz, Feature ... features);

// JSON string deserialize generic types of JavaBean

public static <T> T parseObject(String text, TypeReference<T> type, Feature... features);

// deserialize JSON string is JSONObject

public static JSONObject parseObject(String text); }