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My proof of concept that Java on the server, along with RESTful APIs, can be an impressive and easy way of managing business applications (this uses a standard Domino Java Code element with an XPage as the front-end). Package is defined with a single class and single (static) method, to return the data from a simple REST call, fully on the serve…
package com.eric.restful;
import java.net.URL;
import java.net.URLConnection;
import java.io.BufferedReader;
import com.google.gson.*;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.IOException;
import java.net.MalformedURLException;
import org.apache.commons.validator.routines.*;
/**
* Class with a single, public, static method to provide a REST consumer
* which returns data as a JsonObject.
*
* @author Eric McCormick, @edm00se
*
*/
public class CustRestConsumer {
/**
* Method for receiving HTTP JSON GET request against a RESTful URL data source.
*
* @param myUrlStr the URL of the REST endpoint
* @return JsonObject containing the data from the REST response.
* @throws IOException
* @throws MalformedURLException
* @throws ParseException
*/
public static JsonObject GetMyRestData( String myUrlStr ) throws IOException, MalformedURLException {
JsonObject myRestData = new JsonObject();
try{
UrlValidator defaultValidator = new UrlValidator();
if(defaultValidator.isValid(myUrlStr)){
URL myUrl = new URL(myUrlStr);
URLConnection urlCon = myUrl.openConnection();
urlCon.setConnectTimeout(5000);
InputStream is = urlCon.getInputStream();
InputStreamReader isR = new InputStreamReader(is);
BufferedReader reader = new BufferedReader(isR);
StringBuffer buffer = new StringBuffer();
String line = "";
while( (line = reader.readLine()) != null ){
buffer.append(line);
}
reader.close();
JsonParser parser = new JsonParser();
myRestData = (JsonObject) parser.parse(buffer.toString());
return myRestData;
}else{
myRestData.addProperty("error", "URL failed validation by Apache Commmons URL Validator");
return myRestData;
}
}catch( MalformedURLException e ){
e.printStackTrace();
myRestData.addProperty("error", e.toString());
return myRestData;
}catch( IOException e ){
e.printStackTrace();
myRestData.addProperty("error", e.toString());
return myRestData;
}
}
}
<?xml version="1.0" encoding="UTF-8"?>
<xp:view
xmlns:xp="http://www.ibm.com/xsp/core">
<xp:this.beforePageLoad><![CDATA[#{javascript://import Java package
importPackage(com.eric.restful);
var urlStr = "http://ajax.googleapis.com/ajax/services/feed/load?v=1.0&num=5&q=";
urlStr += "http://www.npr.org/rss/rss.php?id=1001";
var myStuff:JsonObject = CustRestConsumer.GetMyRestData(urlStr);
viewScope.myResp = fromJson(myStuff);}]]></xp:this.beforePageLoad>
<xp:dataTable
id="dataTable1"
rows="30"
var="rowData"
indexVar="rowCount">
<xp:this.value><![CDATA[#{javascript:var obj = viewScope.get("myResp");
return obj.responseData.feed.entries;}]]></xp:this.value>
<xp:column
id="column1">
<xp:this.facets>
<xp:panel
xp:key="header"
tagName="h1">
<xp:link
escape="true"
id="link1">
<xp:this.text><![CDATA[#{javascript:var obj = viewScope.get("myResp");
return obj.title;}]]></xp:this.text>
<xp:this.value><![CDATA[#{javascript:var obj = viewScope.get("myResp");
return obj.link;}]]></xp:this.value>
</xp:link>
</xp:panel>
</xp:this.facets>
</xp:column>
<xp:column
id="column2">
<xp:panel
tagName="h3">
<xp:link
escape="true"
id="link2"
text="#{javascript:rowData.title}"
value="#{javascript:rowData.link}">
</xp:link>
</xp:panel>
<xp:br></xp:br>
<xp:text
escape="false"
id="computedField2"
value="#{javascript:rowData.content}">
</xp:text>
<xp:br></xp:br>
</xp:column>
<xp:column
id="column3">
<xp:text
escape="true"
id="computedField3"
value="#{javascript:rowData.publishedDate}">
</xp:text>
</xp:column>
</xp:dataTable>
</xp:view>
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