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沈俊林
webmagic
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122cebfa
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122cebfa
authored
Sep 27, 2013
by
yihua.huang
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update manual for objectformatter
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9e6d55db
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user-manual.md
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122cebfa
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@@ -395,7 +395,7 @@ webmagic-extension包括注解模块。为什么会有注解方式?
*
#### 类型转换
webmagic的注解模式
直接对抽取结果进行类型转换,通过`ObjectFormatter`实现。webmagic内置了基本类型的支持,这样抽取结果的字段可以是任意基本类型
(需要保证抽取结果能够被转换到对应类型)。
webmagic的注解模式
支持对抽取结果进行类型转换,这样抽取结果并不需要是String类型,而可以是任意类型。webmagic内置了基本类型的支持
(需要保证抽取结果能够被转换到对应类型)。
```java
@ExtractBy("//ul[@class='pagehead-actions']/li[1]//a[@class='social-count js-social-count']/text()")
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@@ -410,7 +410,6 @@ webmagic-extension包括注解模块。为什么会有注解方式?
```
你也可以编写一个实现
`ObjectFormatter`
接口的类,进行自己的类型解析。要使用自己的类,需要调用
`ObjectFormatters.put()`
对这个类进行注册。
*
#### AfterExtractor
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