Groovy examples for beginners and SAP CPI

Pure Groovy mode

Groovy basics: lists and closures

Filter a list, double the selected values and sum the result. findAll selects elements, collect transforms them and sum adds them together.

Groovy code

def zahlen = [1, 2, 3, 4, 5]
def ergebnis = zahlen.findAll { it > 2 }.collect { it * 2 }

println ergebnis
println ergebnis.sum()

Expected console output

[6, 8, 10]
24

The values 3, 4 and 5 match the condition. Doubling them produces [6, 8, 10], whose sum is 24. No SAP classes are needed. The variable zahlen holds the input numbers and ergebnis holds the result.

SAP CPI mode

SAP CPI: read JSON and change the message body

JsonSlurper reads a JSON message body. The script extracts the order number from auftrag and the status, then writes a new body to the Message object.

Input message

{"auftrag": "4711", "status": "neu"}

Groovy code

import com.sap.gateway.ip.core.customdev.util.Message
import groovy.json.JsonSlurper

def Message processData(Message message) {
    def daten = new JsonSlurper().parseText(message.getBody(String))
    message.setBody("Auftrag " + daten.auftrag + ": " + daten.status)
    return message
}

Expected message body

Auftrag 4711: neu

In CPI mode, processData must return the Message object. getBody(String) reads the body as text and setBody replaces it with the result. The sample uses German field names and produces the text “Auftrag 4711: neu” (order 4711: new).

SAP CPI mode

SAP CPI: set headers and exchange properties

A script can change headers and exchange properties as well as the body. This example stores the order number in a header and the processing status in a property.

Input message

4711

Groovy code

import com.sap.gateway.ip.core.customdev.util.Message

def Message processData(Message message) {
    def auftrag = message.getBody(String).trim()
    message.setHeader("Auftragsnummer", auftrag)
    message.setProperty("Verarbeitet", "ja")
    message.setBody("Auftrag " + auftrag + " verarbeitet")
    return message
}

Expected message body

Auftrag 4711 verarbeitet

Alongside the body, the output contains the header Auftragsnummer with the value 4711 and the property Verarbeitet with the value ja. These mean order number and processed: yes. Check all three results in the editor’s output panels.