Mule ESB is used to create an input and output flow using HTTP and Java components. The steps are: 1. Create a Mule project in Anypoint Studio and add an HTTP listener on port 8081 and path /filetransfer. 2. Add a Java component to create a text file when accessed. 3. Configure the Java class to write to a file when triggered by the HTTP request. 4. Start the Mule server and access the HTTP path to generate a text file.

1. Mule ESB
Input and output flow: using http and
java component

2. Open Anypoint Studio
Create a File  New  Mule
Project
Click «Finish»

3. Expandthe«myfirstproject»onpackage
explorer
Doubleclickonmyfirstproject.xml
Oncefileisopen,showMessageFlow
FromMulePaletteview,searchfor‘HTTP’
and‘Java’and selectthefirstone.
DragandDropHTTPthenJava
component intoMessageFlowview.

4. Nowwehavetoconfigure listenerforour
HTTPflow.
DoubleclickonHTTPblueelement.
BelowitwillappearHTTPview.
OntheGeneralSettinglet’screateand
chooseanHTTPListener.
ClickonAdd(+)andconfigure:
Host:default(localhost)
Port:8081
OnBasicSettingsdefinewebservice:
Path:/filetransfer
Allow.Methods:GET
ClickOKandSAVE

5. NowwehavetoconfiguretheJavalogic
component.
CreateapackageandaJavaclassunder
src/main/javafolder.
Createalocalfoldertosavethefile.
Theclasswillcreateasimpletextfileand
writetwolines.
LibrariesIused:
java.io.File;
java.io.FileWriter;
ClickonSAVEattop-leftofscreen

6. ConfigureJavacomponent.
TransformerClass:theclassthatwill
dothelogictocreateafileinalocal
folder.
ClickonSAVE.

7. NowwecanstartourMuleserver
RightClickonprojectRunAsMule
Application
OntheConsoleviewbelowserverisgoing
tostart.
Attheendyouwillseethestatus
DEPLOYED.
Thismeansthatserverisupandrunning
OpenyourbrowserandjointheHTTP
path:http://localhost:8081/filetransfer
Nowwecanseetheresult:openthe
folderwecreatedandlookatthetxtfile
generated.
Enjoy with Mule!