隨著AJAX的火熱應用，JSON也越來越被重視，隨之而來的就是眾多的JSON庫，下面對常用的3個JSON庫(json-lib,jackson,gson)進行性能測試，看下結果如何:
一. 測試環境 該測試只是在本人電腦上進行測試，每次測試前都重啟tomcat，清空緩存，日志等。開的程序也一樣，3次測試測試環境相差無幾。
json-lib版本：json-lib-2.3-jdk15(最新)
jackson版本 : 1.4.3(最新)
gson : 1.4 (最新)
測試工具：apache帶的ab工具
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二. 測試代碼
?? ? ??1.先定義用于序列化成JSON的Bean,其中字段longTime需要在序列化的過程中被忽略，不輸出：
JsonEntity
?1?public?class?JsonEntity?{
?2?????/**
?3??????*?@Expose?是?GSON中表示該字段是需要被序列化的，沒有@Expose表示不需要被序列化
?4??????*/
?5???@Expose
?6?????private?int?id;
?7?????@Expose
?8?????private?String?name;
?9?????@Expose
10?????private?Date?date;
11?????@Expose
12?????private?BigDecimal?money;
13?????????/**
14??????????*?該字段將被忽略
15??????????*?@JsonIgnore?是?jackson中表示該字段是不需要被序列化的??
16??????????*/
17?????????@JsonIgnore
18?????????private?Long?longTime;
19?
20?????public?JsonEntity(int?i){
21?????????id?=?i;
22?????????name?=?"sss"?+?i;
23?????????date?=?new?Date();
24?????????money?=?BigDecimal.valueOf(200);
25?????????longTime?=?2222222l;
26?????}
27?????public?int?getId()?{
28?????????return?id;
29?????}
30?????public?void?setId(int?id)?{
31?????????this.id?=?id;
32?????}
33?????public?String?getName()?{
34?????????return?name;
35?????}
36?????public?void?setName(String?name)?{
37?????????this.name?=?name;
38?????}
39?????public?Date?getDate()?{
40?????????return?date;
41?????}
42?????public?void?setDate(Date?date)?{
43?????????this.date?=?date;
44?????}
45?????public?BigDecimal?getMoney()?{
46?????????return?money;
47?????}
48?????public?void?setMoney(BigDecimal?money)?{
49?????????this.money?=?money;
50?????}
51?????@JsonIgnore
52?????public?Long?getLongTime()?{
53?????????return?longTime;
54?????}
55?????@JsonIgnore
56?????public?void?setLongTime(Long?longTime)?{
57?????????this.longTime?=?longTime;
58?????}
59?
?? ? ??2. 因json-lib不能直接設置日期的轉換方式，需要寫1個Processor的類
DateJsonValueProcessor
?1?public?class?DateJsonValueProcessor?implements?JsonValueProcessor?{
?2?????private?DateFormat?dateFormat;
?3?
?4?????public?DateJsonValueProcessor(String?datePattern)?{
?5?????????????dateFormat?=?new?SimpleDateFormat(datePattern);
?6?????}
?7?????@Override
?8?????public?Object?processArrayValue(Object?o,?JsonConfig?jc)?{
?9?????????return?"";
10?????}
11?????@Override
12?????public?Object?processObjectValue(String?string,?Object?o,?JsonConfig?jc)?{
13?????????return?dateFormat.format(o);
14?????}
15?
?? ? ??3. 寫1個輔助類JsonTestFactory：
public?class?JsonTestFactory?{
????static?JsonConfig?jc;
????static?Gson?gson;
????static?ObjectMapper?mapper;
????public?static?ObjectMapper?getMapper(){
????????if(mapper?==?null){
????????????mapper?=?new?ObjectMapper();
????????????SerializationConfig?sc?=?mapper.getSerializationConfig();
????????????sc.setDateFormat(new?SimpleDateFormat("yyyy-MM-dd"));
????????????mapper.setSerializationConfig(sc);
????????}
????????return?mapper;
????}
????public?static?Gson?getGson(){
????????if(gson?==?null){
????????????GsonBuilder?gb?=?new?GsonBuilder();
????????????gb.setDateFormat("yyyy-MM-dd");
????????????gb.excludeFieldsWithoutExposeAnnotation();
????????????gson?=?gb.create();
????????}
????????return?gson;
????}
????public?static?JsonConfig?getJsonConfig()?{
????????if(jc==null){
????????????jc?=?new?JsonConfig();
????????????jc.registerJsonValueProcessor(Date.class,?new?DateJsonValueProcessor("yyyy-MM-dd"));
????????????jc.registerPropertyExclusion(JsonEntity.class,"longTime");
????????}
????????return?jc;
????}
}
?? ? ?4、下面是4個JSP頁面的代碼，json-lib使用了2種不同的方式進行測試：
?? ? ? ? ??jsonlib1.jsp 代碼:
????????????
JsonEntity?je?=?new?JsonEntity(1);
????????????
out.println(JSONSerializer.toJSON(je,entity.JsonTestFactory.getJsonConfig()).toString());
%>]]>
?? ? ? ? ?jsonlib2.jsp 代碼:
????????????DateFormat?dateFormat?=?new?SimpleDateFormat("yyyy-MM-dd");
????????????JSONObject?json?=?new?JSONObject();
????????????JsonEntity?je?=?new?JsonEntity(1);
????????????json.element("id",?je.getId());
????????????json.element("name",?je.getName());
????????????json.element("money",?je.getMoney());
????????????json.element("date",?dateFormat.format(je.getDate()));
????????????out.println(json.toString());
????????%>]]>
?? ? ? ? ?jackson,jsp
????????????JsonEntity?je?=?new?JsonEntity(1);
????????????out.println(entity.JsonTestFactory.getMapper().writeValueAsString(je));
????????%>]]>
?? ? ? ??gson.jsp
????????????JsonEntity?je?=?new?JsonEntity(1);
????????????out.println(entity.JsonTestFactory.getGson().toJson(je));
????????%>]]>
三、測試結果
?? ? ??測試結果中只需關注Requests per second(平均每秒處理的請求數)，Time per request(平均每個請求處理的時間)
1、ab 測試條件: 發送5000個請求，并發數為10。
| ? | ?jsonlib1.jsp | jsonlib2.jsp? | jackson.jsp? | gson.jsp? |
| ?Concurrency Level | ?10 | ?10 | ?10 | ?10 |
| ?Time taken for tests | ?3.016 seconds | ?3.078 seconds | ?2.859 seconds | ?3.234 seconds |
| ?Complete requests | ?5000 | ?5000 | ?5000 | ?5000 |
| ?Requests per second | ?1658.03 [#/sec] | ?1624.37 [#/sec] | ?1748.63 [#/sec] | ?1545.89 [#/sec] |
| ?Time per request | ?6.031 [ms] | ?6.156 [ms] | ?5.719 [ms] | ?6.469 [ms] |
1、ab 測試條件: 發送30000個請求，并發數為50。
| ? | ?jsonlib1.jsp | jsonlib2.jsp? | jackson.jsp? | gson.jsp? |
| ?Concurrency Level | ?50 | ?50 | ?10 | ?10 |
| ?Time taken for tests | 11.359 seconds | ?12.047 seconds | ?10.922 seconds | ?13.391 seconds |
| ?Complete requests | ?30000 | ?30000 | ?30000 | ?30000 |
| ?Requests per second | ?2640.99 [#/sec] | ?2490.27 [#/sec] | ?2746.78 [#/sec] | ?2240.37 [#/sec] |
| ?Time per request | ?18.932 [ms] | 20.078 [ms] | ?18.203 [ms] | ?22.318 [ms]
|
google的gson傳說性能比較好，不知道為什么這次測試性能這么有問題。jackson的還是非常不錯的。