Data Pipeline
Data Pipeline 是一个Java的数据转换工具包,主要的功能包括:
* 读: CSV, fixed-width, Excel, database, weblogs, custom
* 写: CSV, fixed-width, Excel, database, PDF, Word, XML, custom
* 操作: validate, filter, sort, lookup, 去除重复数据, convert, throttle, calculate, custom, and more
* 运行时表达式过滤器、数据验证以及公式计算
典型的应用场景包括:
1. 读取 CSV 文件
2. 删除重复的记录
3. 添加计算列
4. 删除无用的列
5. 数据保存到数据库
代码示例:
DataReader reader = new CSVReader(new File("credit-balance.csv")) .setFieldNamesInFirstRow(true); // Use only the "Rating" and "CreditLimit" fields in duplicate test reader = new RemoveDuplicatesReader(reader, new FieldList("Rating", "CreditLimit")); // Add AvailableCredit field, remove "CreditLimit", "Balance" fields reader = new TransformingReader(reader) .add(new SetCalculatedField("AvailableCredit", "parseDouble(CreditLimit) - parseDouble(Balance)")) .add(new ExcludeFields("CreditLimit", "Balance")); DataWriter writer = new JdbcWriter(getJdbcConnection(), "dp_credit_balance") .setAutoCloseConnection(true); JobTemplate.DEFAULT.transfer(reader, writer);
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