简介
Fastjson是一个Java语言编写的高性能功能完善的JSON库。
高性能
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。
支持标准
- Fastjson完全支持http://json.org的标准，也是官方网站收录的参考实现之一。
功能强大
- 支持各种JDK类型。包括基本类型、JavaBean、Collection、Map、Enum、泛型等。
- 支持循环引用
无依赖
支持范围广
- 支持JDK 5、JDK 6、Android、阿里云手机等环境。
开源
- Apache License 2.0
- 代码托管在github.org上，项目地址是https://github.com/AlibabaTech/fastjson
测试充分
- fastjson有超过1500个testcase，每次构建都会跑一遍，丰富的测试场景保证了功能稳定。
获得fastjson
下载
http://code.alibabatech.com/mvn/releases/com/alibaba/fastjson/
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maven
如果你使用了Maven，maven repository配置如下：
<repository>
<id>opensesame</id>
<name>Alibaba OpenSource Repsoitory</name>
<url>http:
<snapshots>
<enabled>
false
</enabled>
</snapshots>
</repository>
|
pom.xml文件中加入依赖依赖：
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>
1.1
.
23
</version>
</dependency>
序列化
一个JSON库涉及的最基本功能就是序列化和反序列化。Fastjson支持java bean的直接序列化。你可以使用com.alibaba.fastjson.JSON这个类进行序列化和反序列化。
基本序列化
序列化就是把JavaBean对象转化成JSON格式的文本。
Object o = ...;
String text = JSON.toJSONString(o);
在这个例子中，调用JSON.toJSONString方法，把对象o转化为JSON格式的文本。
使用单引号
标准的JSON是使用双引号的，javascript支持使用单引号格式的json文本，fastjson也支持这个特性，打开SerializerFeature.UseSingleQuotes这个特性就可以了了，例如：
String text = JSON.toJSONString(o,SerializerFeature.UseSingleQuotes);
fastjson序列化时可以选择的SerializerFeature有十几个，你可以按照自己的需要去选择使用。
日期格式化
fastjson直接支持日期类型数据的格式化，包括java.util.Date、java.sql.Date、java.sql.Timestamp、java.sql.Time。
缺省情况下，fastjson将Date类型序列化为long，这个使得序列化和反序列化的过程不会导致时区问题。如：
例如：
long
millis = 1324138987429L;
Date date =
new
Date(millis);
System.out.println(JSON.toJSONString(date));
输出的结果是
fastjson还提供了基于格式化输出的SerializerFeature，例如：
JSON.toJSONString(date,SerializerFeature.WriteDateUseDateFormat);
输出的结果为：
你可以指定输出日期的格式，比如修改为输出毫秒：
JSON.toJSONStringWithDateFormat(date,
"yyyy-MM-dd HH:mm:ss.SSS"
);
输出的结果为:
"2011-12-18 00:23:07.429"
使用WriteClassName特性
fastjson支持序列化时写入类型信息，从而使得反序列化时不至于类型信息丢失。例如：
Color color = Color.RED;
String text = JSON.toJSONString(color,SerializerFeature.WriteClassName);
System.out.println(text);
输出结果：
{
"@type"
:
"java.awt.Color"
,102)!important; font-size:1em!important; vertical-align:baseline!important; overflow:visible!important; border-top:0px; right:auto!important; border-right:0px; padding-top:0px!important; top:auto!important; left:auto!important">"r"
:
255
"g"
0
"b"
"alpha"
}
由于序列化带了类型信息，使得反序列化时能够自动进行类型识别，例如：
String text = ...;
Color color = (Color) JSON.parse(text);
浏览器和设备兼容
fastjson缺省的序列化内容，是对序列化结果紧凑做了优化配置，使得序列化之后长度更小，但是这种优化配置是对一些浏览器和设备不兼容的。比如说在iphone上兼容emoji（绘文字）。
JSON.toJSONString(o,SerializerFeature.BrowserCompatible);
循环引用
很多场景中，我们需要序列化的对象中存在循环引用，在许多的json库中，这会导致stackoverflow。在功能强大的fastjson中，你不需要担心这个问题。例如：
A a =
A();
B b =
B(a);
a.setB(b);
String text = JSON.toJSONString(a);
A a1 = JSON.parSEObject(text,A.
class
);
Assert.assertTrue(a1 == a1.getB().getA());
引用是通过"$ref"来表示的
| 引用 |
描述 |
| "$ref":".." |
上一级 |
| "$ref":"@" |
当前对象，也就是自引用 |
| "$ref":"$" |
根对象 |
| "$ref":"$.children.0" |
基于路径的引用，相当于 root.getChildren().get(0) |
使用@JSONField Annotation
在某些场景，你可能需要定制序列化输出，比如说，希望序列化采用之后采用"ID"，而不是"id"，你可以使用@JSONField这个Annotation。
public
User {
@JSONField
(name=
"ID"
)
int
getId() { ... }
}
User user = ...;
JSON.toJSONString(user);
从json-lib中升级
如果你已经使用了json-lib，并且痛恨他蜗牛般的速度和罗嗦的API，建议你升级为fastjson，fastjson可以完全兼容json-lib的序列化格式。
import
com.alibaba.fastjson.JSON;
com.alibaba.fastjson.serializer.JSONLibDataFormatSerializer;
com.alibaba.fastjson.serializer.JSONSerializerMap;
com.alibaba.fastjson.serializer.SerializerFeature;
private
static
final
SerializeConfig config;
static
{
config =
SerializeConfig();
config.put(java.util.Date.
JSONLibDataFormatSerializer());
config.put(java.sql.Date.
// 使用和json-lib兼容的日期输出格式
}
SerializerFeature[] features = { SerializerFeature.WriteMapNullValue,
SerializerFeature.WriteNullListAsEmpty,0)!important; font-size:1em!important; vertical-align:baseline!important; overflow:visible!important; border-top:0px; right:auto!important; border-right:0px; padding-top:0px!important; top:auto!important; left:auto!important">// list字段如果为null，输出为[]，而不是null
SerializerFeature.WriteNullNumberAsZero,0)!important; font-size:1em!important; vertical-align:baseline!important; overflow:visible!important; border-top:0px; right:auto!important; border-right:0px; padding-top:0px!important; top:auto!important; left:auto!important">// 数值字段如果为null，输出为0，而不是null
SerializerFeature.WriteNullBooleanAsFalse,0)!important; font-size:1em!important; vertical-align:baseline!important; overflow:visible!important; border-top:0px; right:auto!important; border-right:0px; padding-top:0px!important; top:auto!important; left:auto!important">// Boolean字段如果为null，输出为false，而不是null
SerializerFeature.WriteNullStringAsEmpty
};
String toCompatibleJSONString(Object object) {
return
JSON.toJSONString(object,config,features);
}
通过上面代码中的toCompatibleJSONString方法，你就可以实现完全兼容json-lib了。
反序列化
反序列化就是把JSON格式的文本转化为Java Bean对象。
指定Class信息反序列化
通过指定类型信息，可以很方便的将"JSON文本"反序列化为"Java Bean"对象，例如：
// {"r":255,0)!important; font-size:1em!important; vertical-align:baseline!important; overflow:visible!important; border-top:0px; right:auto!important; border-right:0px; padding-top:0px!important; top:auto!important; left:auto!important">Color color = JSON.parSEObject(text,Color.
);
类型集合的反序列化
这个接口类似于parSEObject
// [{ ... },{ ... }]
List<User> users = JSON.parseArray(text,User.
泛型的反序列化
如果你需要返回一个带泛型的对象，例如List<User>、Map<String,User>，你可以使用TypeReference来传入类型信息。
// {"name":{"name":"ljw",age:18}}
Map<String,User> userMap = JSON.parSEObject(text,0)!important; font-size:1em!important; vertical-align:baseline!important; overflow:visible!important; border-top:0px; right:auto!important; border-right:0px; padding-top:0px!important; top:auto!important; left:auto!important">TypeReference<Map<String,User>>() {});
组合类型集合的反序列化
比如在网络协议中，经常会存在这样的组合:
fastjson对这种结构的反序列化有专门支持。
// [{/* header */},{/* body */}]
Type[] types =
Type[] {Header.
};
List<Object> list = JSON.parseArray(text,types);
Header header = (Header) list.get(
);
Body body = (Body) list.get(
1
使用@JSONCreator来指定构造函数来创建对象
如果你的JavaBean没有缺省构造函数，可以使用@JSONCreator来指定构造函数
class
Entity {
final
int
id;
final
String name;
@JSONCreator
public
Entity(
(name =
"id"
)
id,
"name"
) String name){
this
.id = id;
.name = name;
}
getId() {
id; }
String getName() {
name; }
}
把JSON文本反序列化为一个原型接口
interface
Bean {
getId();
void
setId(
value);
String getName();
setName(String value);
}
String text =
"{"id":123,"name":"chris"}"
;
Bean bean = JSON.parSEObject(text,Bean.
);
Assert.assertEquals(
123
Assert.assertEquals(
"chris"
bean.setId(
234
);
（编辑：李大同）
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