Make the POST call
The next step is to make an HTTP POST call to the endpoint with the necessary parameters. The DDX and the pdf files are provided as resource files. End point has token based authentication we pass the Access Token in the request header.
When using the Assembler service, use an XML-based language called Document Description XML (DDX) to describe the output you want. DDX is a declarative markup language whose elements represent building blocks of documents.The following DDX was used to merge the two pdf documents identified in the PDF source elements.
<DDX xmlns="http://ns.adobe.com/DDX/1.0/">
<PDF result="doc3.pdf">
<PDF source="CA-Drivers-Handbook.pdf"/>
<PDF source="CA-Parent-Teen-Handbook.pdf"/>
</PDF>
</DDX>
The following code was used to combine pdf files
package com.aemformscs.documentservices;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.net.URL;
import org.apache.commons.io.IOUtils;
import org.apache.http.HttpEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.ContentType;
import org.apache.http.entity.mime.HttpMultipartMode;
import org.apache.http.entity.mime.MultipartEntityBuilder;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
public class AssemblePDFFiles {
public String SAVE_LOCATION = "c:\\assembledpdf";
public void assemblePDF(String postURL) {
HttpPost httpPost = new HttpPost(postURL);
CredentialUtilites cu = new CredentialUtilites();
String accessToken = cu.getAccessToken();
httpPost.addHeader("Authorization", "Bearer " + accessToken);
ClassLoader classLoader = DocumentGeneration.class.getClassLoader();
URL ddxFile = classLoader.getResource("ddxfiles/assemble2pdfs.ddx");
MultipartEntityBuilder builder = MultipartEntityBuilder.create();
builder.setMode(HttpMultipartMode.BROWSER_COMPATIBLE);
File ddx = new File(ddxFile.getPath());
builder.addBinaryBody("ddx", ddx, ContentType.create("application/xml"), ddx.getName());
URL url = classLoader.getResource("pdffiles");
System.out.println(url.getPath());
File files[] = new File(url.getPath()).listFiles();
for (int i = 0; i < files.length; i++) {
System.out.println("Added " + files[i].getName());
builder.addBinaryBody(files[i].getName(), files[i], ContentType.APPLICATION_OCTET_STREAM, files[i].getName());
}
try {
HttpEntity entity = builder.build();
httpPost.setEntity(entity);
CloseableHttpClient httpclient = HttpClients.createDefault();
CloseableHttpResponse response = httpclient.execute(httpPost);
System.out.println("The success code is " + response.getStatusLine().getStatusCode());
InputStream generatedPDF = response.getEntity().getContent();
byte[] bytes = IOUtils.toByteArray(generatedPDF);
File saveLocation = new File(SAVE_LOCATION);
if (!saveLocation.exists()) {
saveLocation.mkdirs();
}
File outputFile = new File(SAVE_LOCATION + File.separator + "assembledPDF.pdf");
FileOutputStream outputStream = new FileOutputStream(outputFile);
outputStream.write(bytes);
outputStream.close();
System.out.println("AssembledPDF.pdf saved to " + SAVE_LOCATION);
} catch (Exception e) {
System.out.println("The message is " + e.getMessage());
}
}
}
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