几种常用 JSON 库性能比较
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原文：www.xncoding.com/2018/01/09/java/jsons.html
字符串解析成JSON性能
字符串解析成JavaBean性能
JavaBean构造JSON性能
集合构造JSON性能
易用性
Jackson 所依赖的jar包较少，简单易用。
与其他 Java 的 json 的框架 Gson 等相比，Jackson 解析大的 json 文件速度比较快。
Jackson 运行时占用内存比较低，性能比较好
Jackson 有灵活的 API，可以很容易进行扩展和定制。
jackson-core 核心包，提供基于”流模式”解析的相关 API，它包括 JsonPaser 和 JsonGenerator。Jackson 内部实现正是通过高性能的流模式 API 的 JsonGenerator 和 JsonParser 来生成和解析 json。
jackson-annotations 注解包，提供标准注解功能；
jackson-databind 数据绑定包，提供基于”对象绑定” 解析的相关 API（ ObjectMapper ）和”树模型” 解析的相关 API（JsonNode）；基于”对象绑定” 解析的 API 和”树模型”解析的 API 依赖基于”流模式”解析的 API。
<!-- Json libs-->
<dependency>
<groupId>net.sf.json-lib</groupId>
<artifactId>json-lib</artifactId>
<version> 2.4</version>
<classifier>jdk15</classifier>
</dependency>
<dependency>
<groupId>com.google.code.gson</groupId>
<artifactId>gson</artifactId>
<version> 2.8.2</version>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version> 1.2.46</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version> 2.9.4</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-annotations</artifactId>
<version> 2.9.4</version>
</dependency>
public class FastJsonUtil {
public static String bean2Json(Object obj) {
return JSON.toJSONString(obj);
}
public static <T> T json2Bean(String jsonStr, Class<T> objClass) {
return JSON.parseObject(jsonStr, objClass);
}
}
public class GsonUtil {
private static Gson gson = new GsonBuilder().create();
public static String bean2Json(Object obj) {
return gson.toJson(obj);
}
public static <T> T json2Bean(String jsonStr, Class<T> objClass) {
return gson.fromJson(jsonStr, objClass);
}
public static String jsonFormatter(String uglyJsonStr) {
Gson gson = new GsonBuilder().setPrettyPrinting().create();
JsonParser jp = new JsonParser();
JsonElement je = jp.parse(uglyJsonStr);
return gson.toJson(je);
}
}
public class JacksonUtil {
private static ObjectMapper mapper = new ObjectMapper();
public static String bean2Json(Object obj) {
try {
return mapper.writeValueAsString(obj);
} catch (JsonProcessingException e) {
e.printStackTrace();
return null;
}
}
public static <T> T json2Bean(String jsonStr, Class<T> objClass) {
try {
return mapper.readValue(jsonStr, objClass);
} catch (IOException e) {
e.printStackTrace();
return null;
}
}
}
public class JsonLibUtil {
public static String bean2Json(Object obj) {
JSONObject jsonObject = JSONObject.fromObject(obj);
return jsonObject.toString();
}
@SuppressWarnings( "unchecked")
public static <T> T json2Bean(String jsonStr, Class<T> objClass) {
return (T) JSONObject.toBean(JSONObject.fromObject(jsonStr), objClass);
}
}
public class Person {
private String name;
private FullName fullName;
private int age;
private Date birthday;
private List<String> hobbies;
private Map<String, String> clothes;
private List<Person> friends;
// getter/setter省略
@ Override
public String toString() {
StringBuilder str = new StringBuilder( "Person [name=" + name + ", fullName=" + fullName + ", age="
+ age + ", birthday=" + birthday + ", hobbies=" + hobbies
+ ", clothes=" + clothes + "]\n");
if (friends != null) {
str.append( "Friends:\n");
for (Person f : friends) {
str.append( "\t").append(f);
}
}
return str.toString();
}
}
public class FullName {
private String firstName;
private String middleName;
private String lastName;
public FullName() {
}
public FullName(String firstName, String middleName, String lastName) {
this.firstName = firstName;
this.middleName = middleName;
this.lastName = lastName;
}
// 省略getter和setter
@ Override
public String toString() {
return "[firstName=" + firstName + ", middleName="
+ middleName + ", lastName=" + lastName + "]";
}
}
@BenchmarkMode(Mode.SingleShotTime)
@OutputTimeUnit(TimeUnit.SECONDS)
@State(Scope.Benchmark)
public class JsonSerializeBenchmark {
/**
* 序列化次数参数
*/
@Param({ "1000", "10000", "100000"})
private int count;
private Person p;
public static void main(String[] args) throws Exception {
Options opt = new OptionsBuilder()
.include(JsonSerializeBenchmark. class.getSimpleName())
.forks( 1)
.warmupIterations( 0)
.build();
Collection<RunResult> results = new Runner(opt).run();
ResultExporter.exportResult( "JSON序列化性能", results, "count", "秒");
}
@ Benchmark
public void JsonLib() {
for ( int i = 0; i < count; i++) {
JsonLibUtil.bean2Json(p);
}
}
@ Benchmark
public void Gson() {
for ( int i = 0; i < count; i++) {
GsonUtil.bean2Json(p);
}
}
@ Benchmark
public void FastJson() {
for ( int i = 0; i < count; i++) {
FastJsonUtil.bean2Json(p);
}
}
@ Benchmark
public void Jackson() {
for ( int i = 0; i < count; i++) {
JacksonUtil.bean2Json(p);
}
}
@ Setup
public void prepare() {
List<Person> friends= new ArrayList<Person>();
friends.add(createAPerson( "小明",null));
friends.add(createAPerson( "Tony",null));
friends.add(createAPerson( "陈小二",null));
p=createAPerson( "邵同学",friends);
}
@ TearDown
public void shutdown() {
}
private Person createAPerson(String name,List<Person> friends) {
Person newPerson= new Person();
newPerson.setName(name);
newPerson.setFullName( new FullName( "zjj_first", "zjj_middle", "zjj_last"));
newPerson.setAge( 24);
List<String> hobbies= new ArrayList<String>();
hobbies.add( "篮球");
hobbies.add( "游泳");
hobbies.add( "coding");
newPerson.setHobbies(hobbies);
Map<String,String> clothes= new HashMap<String, String>();
clothes.put( "coat", "Nike");
clothes.put( "trousers", "adidas");
clothes.put( "shoes", "安踏");
newPerson.setClothes(clothes);
newPerson.setFriends(friends);
return newPerson;
}
}
ResultExporter.exportResult( "JSON序列化性能", results, "count", "秒");
@BenchmarkMode(Mode.SingleShotTime)
@OutputTimeUnit(TimeUnit.SECONDS)
@State(Scope.Benchmark)
public class JsonDeserializeBenchmark {
/**
* 反序列化次数参数
*/
@Param({ "1000", "10000", "100000"})
private int count;
private String jsonStr;
public static void main(String[] args) throws Exception {
Options opt = new OptionsBuilder()
.include(JsonDeserializeBenchmark. class.getSimpleName())
.forks( 1)
.warmupIterations( 0)
.build();
Collection<RunResult> results = new Runner(opt).run();
ResultExporter.exportResult( "JSON反序列化性能", results, "count", "秒");
}
@ Benchmark
public void JsonLib() {
for ( int i = 0; i < count; i++) {
JsonLibUtil.json2Bean(jsonStr, Person. class);
}
}
@ Benchmark
public void Gson() {
for ( int i = 0; i < count; i++) {
GsonUtil.json2Bean(jsonStr, Person. class);
}
}
@ Benchmark
public void FastJson() {
for ( int i = 0; i < count; i++) {
FastJsonUtil.json2Bean(jsonStr, Person. class);
}
}
@ Benchmark
public void Jackson() {
for ( int i = 0; i < count; i++) {
JacksonUtil.json2Bean(jsonStr, Person. class);
}
}
@ Setup
public void prepare() {
jsonStr= "{\"name\":\"邵同学\",\"fullName\":{\"firstName\":\"zjj_first\",\"middleName\":\"zjj_middle\",\"lastName\":\"zjj_last\"},\"age\":24,\"birthday\":null,\"hobbies\":[\"篮球\",\"游泳\",\"coding\"],\"clothes\":{\"shoes\":\"安踏\",\"trousers\":\"adidas\",\"coat\":\"Nike\"},\"friends\":[{\"name\":\"小明\",\"fullName\":{\"firstName\":\"xxx_first\",\"middleName\":\"xxx_middle\",\"lastName\":\"xxx_last\"},\"age\":24,\"birthday\":null,\"hobbies\":[\"篮球\",\"游泳\",\"coding\"],\"clothes\":{\"shoes\":\"安踏\",\"trousers\":\"adidas\",\"coat\":\"Nike\"},\"friends\":null},{\"name\":\"Tony\",\"fullName\":{\"firstName\":\"xxx_first\",\"middleName\":\"xxx_middle\",\"lastName\":\"xxx_last\"},\"age\":24,\"birthday\":null,\"hobbies\":[\"篮球\",\"游泳\",\"coding\"],\"clothes\":{\"shoes\":\"安踏\",\"trousers\":\"adidas\",\"coat\":\"Nike\"},\"friends\":null},{\"name\":\"陈小二\",\"fullName\":{\"firstName\":\"xxx_first\",\"middleName\":\"xxx_middle\",\"lastName\":\"xxx_last\"},\"age\":24,\"birthday\":null,\"hobbies\":[\"篮球\",\"游泳\",\"coding\"],\"clothes\":{\"shoes\":\"安踏\",\"trousers\":\"adidas\",\"coat\":\"Nike\"},\"friends\":null}]}";
}
@ TearDown
public void shutdown() {
}
}
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