取出数据的代码与此类似，见清单3。
The code for popping data out is similar, as Listing 3 shows.
为了将数据输入服务或者从服务取出数据，输入和输出是必须的。
To get data into and out of the service, an input and an output are required.
一旦提取出数据之后，这些数据就可以进行查看、打印或重定向到其他文件或数据库中了。
Once extracted, that data can be manipulated for viewing and printing or directed into other files or databases.
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