Java com.itextpdf:book:war:5.3.1-SNAPSHOT:无法解析以下工件：

我在这个演示项目上工作，当我试图构建我的api时，我收到了这个错误消息（依赖项）

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由于这是快照版本，因此可能无法下载。您可以使用maven central提供的

确保为所有用作依赖项的库添加存储库。

Failed to execute goal on project book: Could not resolve dependencies for project   
com.itextpdf:book:war:5.3.1-SNAPSHOT: 
The following artifacts could not be resolved: 
com.itextpdf:itextpdf:jar:5.3.1-SNAPSHOT, 
com.itextpdf:itext-xtra:jar:5.3.1-SNAPSHOT, 
com.itextpdf:itext-pdfa:jar:5.3.1-SNAPSHOT, 
itext-pdfa:com.itextpdf:jar:5.3.1-SNAPSHOT: 
Could not find artifact com.itextpdf:itextpdf:jar:5.3.1-SNAPSHOT -> [Help 1]

To see the full stack trace of the errors, re-run Maven with the -e switch.
Re-run Maven using the -X switch to enable full debug logging.

For more information about the errors and possible solutions, please read the following articles:
[Help 1] http://cwiki.apache.org/confluence/display/MAVEN/DependencyResolutionException