Camel Data Conversion

During system integration, an essential task is to convert data from one format to another, and then send the converted format to the target system:

The message translator provided by camel can be divided:

■ Using a processor
■ Using beans
■ Using <transform>

1. The example of getting started with Apache camel framework using processor has already introduced .blog.csdn.net/kkdelta/article/details/7231640

By implementing the processor method process (exchange), the common step is to get data from the inbound message, convert the data, and put it in the outbound message.

Xxx DATA = exchange. getin (). getbody (XXX. Class );

// Conversion

Exchange. getout (). setbody (yyyobject );

2. Using Bean, write a Java Bean as follows:

Public class ordertocsvbean {
Public String map (string custom ){
String id = custom. substring (0, 9 );
String customerid = custom. substring (10, 19 );
String date = custom. substring (20, 29 );
String items = custom. substring (30 );
String [] itemids = items. Split ("@");

Stringbuilder CSV = new stringbuilder ();
CSV. append (Id. Trim ());
CSV. append (","). append (date. Trim ());
CSV. append (","). append (customerid. Trim ());
For (string item: itemids ){
CSV. append (","). append (item. Trim ());
}
Return CSV. tostring ();
}
}

The code in route is as follows:

From ("file: D:/temp/inbox1 /? Delay= 30000 "). Bean (New ordertocsvbean (). To (" file: D:/temp/outbox1 ");

Camel has a set of algorithms to choose which method to call in bean (for example, whether the method name is set through camelbeanmethodname in the message header, and whether the bean has only one method, whether @ handler annotation is added to a method). The bean here has only one map method, and camel will call this method.

3. Use the defined transform method in route, which is rarely used.

From ("Direct: Start"). Transform (body (). regexreplaceall ("\ n", "<br/>"). To ("mock: result ");

4. Camel integration parses many common data formats: the parsed results can be obtained by calling the unmarshal method.

CSV:

From ("file: D:/temp/inbox1 /? Delay = 30000 "pai.unmarshal().csv (). Process (processor). To (" file: D:/temp/outbox1 ");

The parsed data can be directly obtained in processor:

Public class csvprocessor implements processor {
@ Override
Public void process (exchange) throws exception {
System. Out. println ("process ...");
List csvdata = (list) Exchange. getin (). getbody ();
Stringbuffer strbf = new stringbuffer ();
If (csvdata. Get (0). getclass (). Equals (string. Class) {// single line CSV
Strbf. append (parseorder (csvdata ));
} Else {// multiple line CSV
For (list <string> csvorder: (list <string>) csvdata ){
Strbf. append (parseorder (csvorder ));
}
}
Exchange. getout (). setbody (strbf. tostring ());
}

Private string parseorder (list <string> csvdata ){
System. Out. println (csvdata. Get (0) + "--" + csvdata. Get (1) + "--" + csvdata. Get (2 ));
Return csvdata. Get (0) + "--" + csvdata. Get (1) + "--" + csvdata. Get (2 );
}
}