Converting with custom transformer

Oct 12, 2015Download as PPTX, PDF0 likes192 views

This document discusses how to use a custom transformer in Mule to directly transform an XML payload to JSON. It provides an example of a Mule flow that uses a custom Java transformer class to take an XML file, convert it to a JSON string, and write the output to a new file. The custom transformer uses the Jackson XML and JSON libraries to perform the actual conversion between the two formats. Testing the flow results in the XML payload being successfully transformed to JSON and written out as expected.

Transforming with Custom
Transformer in Mule

Sometime in our Mule flow we require to transform a
payload from one form to another.
For example in some cases, we need transform an XML
payload to JSON

Now there are several ways of transforming the XML payload to
JSON in Mule. You can use XML to Object transformer and then
Object to JSON transformer in doing so.
But how about using a custom transformer to directly transform
XML to JSON ?
It will be a very easy way in achieving that without using much
transformer in our flow and can directly transform end-to-end

But how can we use Custom transformer to transform in
Mule??
.

Let us consider we have a following Mule flow :-
Now you can see in the above flow the inbound endpoint will pic a file that
contains XML content from a location and put it into another location and the
outbound file will contain it’s corresponding JSON content.
You can also see a custom transformer in the middle which is responsible for
this XML payload conversion to JSON directly.

Now, let’s check the code for this flow :-
<flow name="CustomXMLToJSONTransformer" doc:name="CustomXMLToJSONTransformer">
<file:inbound-endpoint path="E:backuptest" responseTimeout="10000" doc:name="File">
<file:filename-regex-filter pattern="xmlFile.txt" caseSensitive="false"/>
</file:inbound-endpoint>
<file:file-to-string-transformer doc:name="File to String"/>
<custom-transformer class="CustomXMLToJSONTransformer" doc:name="XmlToJson"/>
<logger message="#[message.payload]" level="INFO" doc:name="Logger" />
<file:outbound-endpoint path="E:backuptestnewfolder" outputPattern="jsonFile.txt"
responseTimeout="10000" doc:name="File" />
</flow>
As you can see the file xmlFile.txt contains XML content that will be converted directly
into JSON by the custom-transformer into a file jsonFile.txt

Now let’s check the XML content of file xmlFile.txt :-
So, the above is the XML content we need to convert using our custom
transformer into a corresponding JSON

So our custom transformer java class is the following :-
public class CustomXMLToJSONTransformer extends AbstractMessageTransformer implements
DiscoverableTransformer {
public Object transformMessage(MuleMessage message, String outputEncoding)
throws TransformerException {
try {
String xml = (String) message.getPayload();
XmlMapper xmlMapper = new XmlMapper();
List entries = xmlMapper.readValue(xml, List.class);
ObjectMapper jsonMapper = new ObjectMapper();
String json = jsonMapper.writeValueAsString(entries);
return json;
} catch (Exception e) {
System.out.println("Error: " + e);
e.printStackTrace();
}
return null;
}
@Override
public int getPriorityWeighting() {
return 0;
}
@Override
public void setPriorityWeighting(int weighting) {
}
}

Now let’s test our application . We will see the following in our Mule console :-
You can see the payload is transformed into JSON and has been dispatched to location
E:backuptestnewfolder with file name jsonFile.txt

Now if we open the file jsonFile.txt from location
E:backuptestnewfolder we will get our JSON content as following
You can see you have generated the JSON for the XML directly just using a simple
custom transformer component

Hope you enjoyed the simple yet an amazing trick in Mule

This document describes how to use a custom transformer in Mule to convert a JSON payload to XML. The Mule flow uses a file inbound endpoint to pick up a JSON file, passes it through a custom transformer Java class that converts it to XML using JSON.toString(), and writes the XML output to a file using a file outbound endpoint. The JSON and generated XML contents are displayed. The custom transformer provides a simple way to transform between JSON and XML formats in Mule without writing additional code.

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This document discusses how to use a custom transformer in Mule to directly transform an XML payload to JSON. It provides an example of a Mule flow that uses a custom transformer implemented as a Java class to read an XML file, convert it to a JSON string, and write the output to a new file. The custom transformer uses the Jackson XML and JSON mappers to perform the actual conversion between the two formats. Testing the flow results in the XML payload being successfully transformed to JSON and written out as expected.

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Converting with custom transformer

1. Transforming with Custom Transformer in Mule

2. Sometime in our Mule flow we require to transform a payload from one form to another. For example in some cases, we need transform an XML payload to JSON

3. Now there are several ways of transforming the XML payload to JSON in Mule. You can use XML to Object transformer and then Object to JSON transformer in doing so. But how about using a custom transformer to directly transform XML to JSON ? It will be a very easy way in achieving that without using much transformer in our flow and can directly transform end-to-end

4. But how can we use Custom transformer to transform in Mule?? .

5. Here I will show you how ……

6. Let us consider we have a following Mule flow :- Now you can see in the above flow the inbound endpoint will pic a file that contains XML content from a location and put it into another location and the outbound file will contain it’s corresponding JSON content. You can also see a custom transformer in the middle which is responsible for this XML payload conversion to JSON directly.

7. Now, let’s check the code for this flow :- <flow name="CustomXMLToJSONTransformer" doc:name="CustomXMLToJSONTransformer"> <file:inbound-endpoint path="E:backuptest" responseTimeout="10000" doc:name="File"> <file:filename-regex-filter pattern="xmlFile.txt" caseSensitive="false"/> </file:inbound-endpoint> <file:file-to-string-transformer doc:name="File to String"/> <custom-transformer class="CustomXMLToJSONTransformer" doc:name="XmlToJson"/> <logger message="#[message.payload]" level="INFO" doc:name="Logger" /> <file:outbound-endpoint path="E:backuptestnewfolder" outputPattern="jsonFile.txt" responseTimeout="10000" doc:name="File" /> </flow> As you can see the file xmlFile.txt contains XML content that will be converted directly into JSON by the custom-transformer into a file jsonFile.txt

8. Now let’s check the XML content of file xmlFile.txt :- So, the above is the XML content we need to convert using our custom transformer into a corresponding JSON

9. So our custom transformer java class is the following :- public class CustomXMLToJSONTransformer extends AbstractMessageTransformer implements DiscoverableTransformer { public Object transformMessage(MuleMessage message, String outputEncoding) throws TransformerException { try { String xml = (String) message.getPayload(); XmlMapper xmlMapper = new XmlMapper(); List entries = xmlMapper.readValue(xml, List.class); ObjectMapper jsonMapper = new ObjectMapper(); String json = jsonMapper.writeValueAsString(entries); return json; } catch (Exception e) { System.out.println("Error: " + e); e.printStackTrace(); } return null; } @Override public int getPriorityWeighting() { return 0; } @Override public void setPriorityWeighting(int weighting) { } }

10. Now let’s test our application . We will see the following in our Mule console :- You can see the payload is transformed into JSON and has been dispatched to location E:backuptestnewfolder with file name jsonFile.txt

11. Now if we open the file jsonFile.txt from location E:backuptestnewfolder we will get our JSON content as following You can see you have generated the JSON for the XML directly just using a simple custom transformer component

12. Hope you enjoyed the simple yet an amazing trick in Mule

Converting with custom transformer

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