CSVThe CSV Data Format uses Apache Commons CSV to handle CSV payloads (Comma Separated Values) such as those exported/imported by Excel. Options
Marshalling a Map to CSVThe component allows you to marshal a Java Map (or any other message type that can be converted in a Map) into a CSV payload. An example: if you send a message with this map... Map<String, Object> body = new HashMap<String, Object>(); body.put("foo", "abc"); body.put("bar", 123); ... through this route ... from("direct:start"). marshal().csv(). to("mock:result"); ... you will end up with a String containing this CSV message abc,123 Sending the Map below through this route will result in a CSV message that looks like foo,bar Unmarshalling a CSV message into a Java ListUnmarshalling will transform a CSV messsage into a Java List with CSV file lines (containing another List with all the field values). An example: we have a CSV file with names of persons, their IQ and their current activity. Jack Dalton, 115, mad at Averell
Joe Dalton, 105, calming Joe
William Dalton, 105, keeping Joe from killing Averell
Averell Dalton, 80, playing with Rantanplan
Lucky Luke, 120, capturing the Daltons
We can now use the CSV component to unmarshal this file: from("file:src/test/resources/?fileName=daltons.csv&noop=true"). unmarshal().csv(). to("mock:daltons"); The resulting message will contain a List<List<String>> like... List<List<String>> data = (List<List<String>>) exchange.getIn().getBody(); for (List<String> line : data) { LOG.debug(String.format("%s has an IQ of %s and is currently %s", line.get(0), line.get(1), line.get(2))); } Marshalling a List<Map> to CSVAvailable as of Camel 2.1 If you have multiple rows of data you want to be marshalled into CSV format you can now store the message payload as a List<Map<String, Object>> object where the list contains a Map for each row. File Poller of CSV, then unmarshalingGiven a bean which can handle the incoming data... MyCsvHandler.java // Some comments here public void doHandleCsvData(List<List<String>> csvData) { // do magic here } ... your route then looks as follows <route> <!-- poll every 10 seconds --> <from uri="file:///some/path/to/pickup/csvfiles?delete=true&consumer.delay=10000" /> <unmarshal><csv /></unmarshal> <to uri="bean:myCsvHandler?method=doHandleCsvData" /> </route> Marshaling with a pipe as delimiterUsing the Spring/XML DSL: <route> <from uri="direct:start" /> <marshal> <csv delimiter="|" /> </marshal> <to uri="bean:myCsvHandler?method=doHandleCsv" /> </route> Or the Java DSL: CsvDataFormat csv = new CsvDataFormat(); CSVConfig config = new CSVConfig(); config.setDelimiter('|'); csv.setConfig(config); from("direct:start") .marshal(csv) .convertBodyTo(String.class) .to("bean:myCsvHandler?method=doHandleCsv"); CsvDataFormat csv = new CsvDataFormat(); csv.setDelimiter("|"); from("direct:start") .marshal(csv) .convertBodyTo(String.class) .to("bean:myCsvHandler?method=doHandleCsv"); Unmarshaling with a pipe as delimiterUsing the Spring/XML DSL: <route> <from uri="direct:start" /> <unmarshal> <csv delimiter="|" /> </unmarshal> <to uri="bean:myCsvHandler?method=doHandleCsv" /> </route> Or the Java DSL: CsvDataFormat csv = new CsvDataFormat(); CSVStrategy strategy = CSVStrategy.DEFAULT_STRATEGY; strategy.setDelimiter('|'); csv.setStrategy(strategy); from("direct:start") .unmarshal(csv) .to("bean:myCsvHandler?method=doHandleCsv"); CsvDataFormat csv = new CsvDataFormat(); csv.setDelimiter("|"); from("direct:start") .unmarshal(csv) .to("bean:myCsvHandler?method=doHandleCsv"); DependenciesTo use CSV in your camel routes you need to add the a dependency on camel-csv which implements this data format. If you use maven you could just add the following to your pom.xml, substituting the version number for the latest & greatest release (see the download page for the latest versions). <dependency> <groupId>org.apache.camel</groupId> <artifactId>camel-csv</artifactId> <version>2.0.0</version> </dependency> |