Get Rendered Report to Calling Client
The following example demonstrates how an authenticated user is able to log onto the Repertoire Server from the application through the REST API to render a specific report template.
The parameters required to be parsed in are:
1/ The url of the report template on the server, e.g. “https://localhost:8443/report/ElixirSamples/Report/Charting/3D%20Visualization.rml?mime-type=application/pdf”
2/ The output path and filename for the rendered file
3/ User name and password
Within the Java class environment import the following Java references:
import java.io.BufferedInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
To talk to the server via the REST API add the following .jar files from the “/lib” directory of the Repertoire Server installation:
commons-codec-1.3.jar
commons-httpclient-3.0.1.jar
commons-logging.jar
and import them into the class file:
import org.apache.commons.httpclient.Credentials;
import org.apache.commons.httpclient.Header;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.UsernamePasswordCredentials;
import org.apache.commons.httpclient.auth.AuthScope;
import org.apache.commons.httpclient.methods.GetMethod;
import org.apache.commons.httpclient.params.HttpClientParams;
For logging purposes the method getResponseHeaders() is used which is similar to the IJobInfo found in the ERSClient:
Header[] headers = method.getResponseHeaders();
for (Header header : headers) {
System.out.println( header.getName());
System.out.println( header.getValue());
}
//Opens a connection and sends the credentials
//to the Repertoire Server
try {
HttpClient client = new HttpClient();
Credentials defaultCreds = new UsernamePasswordCredentials(username,password);
client.getState().setCredentials(new AuthScope(“localhost”,8086,AuthScope.ANY_REALM), defaultCreds);
HttpClientParams params = client.getParams();
params.setCredentialCharset(CredentialCharset);
params.setAuthenticationPreemptive(true);
//Instantiates a new GET method
GetMethod method = new GetMethod( url );
method.setFollowRedirects( true );
// Executes the GET method
//that was instantiated
int statusCode = client.executeMethod( method );
if( statusCode != -1 ) {
System.out.println( “Reading file” );
InputStream is = method.getResponseBodyAsStream();
BufferedInputStream bis = new BufferedInputStream( is );
FileOutputStream fos = new FileOutputStream( filename );
byte[] bytes = new byte[ 8192 ];
int count = bis.read( bytes );
while( count != -1 && count <= 8192 ) {
System.out.print( “-” );
fos.write( bytes, 0, count );
count = bis.read( bytes );
}
if( count != -1 ) {
fos.write( bytes, 0, count );
}
//Information regarding the request is returned as the response header
//This is similar to the iJobInfo in the ERSClient
Header[] headers = method.getResponseHeaders();
for (Header header : headers) {
System.out.println( header.getName());
System.out.println( header.getValue());
}
//Once completed the File and Buffered
//output streams are closed
fos.close();
bis.close();
method.releaseConnection();
System.out.println( “\nDone” );
}
}
catch( Exception e ) {
e.printStackTrace();
}
}
Below are explanations and walk through of the code. The full Java class can be downloaded here