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heiriticheiritic 

How to Call External Web Service in Visual Force ?

Hi Everyone,

I want to ask about visualforce. Is it possible to call external web service in visualforce? any suggestions would be great.
Just for information, let's say I want to call S3 web service into visualforce.

thanx
StormConsultingStormConsulting
Yes it is now possible to do that.

The information is on page 143 of the Apex Language Reference PDF.

Basically, you need to download the WSDL, go to Setup>Develop>Apex Classes>Generate From WSDL

This needs to be done on a sandbox of development account, the option does not exist in a production account.

This creates a class based on your WSDL, you can then call the web service methods from the class, see the Reference PDF.

Once you have the web service class, you can create a VF page with a custom controller, from the controller you can invoke the web service methods by calling the web service class.

Hope this helps,
Chris


Message Edited by StormConsulting on 08-06-2008 06:49 AM
Ron HessRon Hess
i was not able to import that wsdl due to some issue with the parser, so i wrote the whole thing using http.send();


the source code is here:

http://code.google.com/p/visualforce-components/source/browse/#svn/trunk/awss3/src/unpackaged/classes

enjoy
heiriticheiritic
I have made the apex class contains of AWS class from http://code.google.com/p/visualforce-components/source/browse/#svn/trunk/awss3/src/unpackaged/classes.  Below is my class :

Code:
public class AWSResponse {
    /* need to parse the following XML from AWS
     * 
    ListBucketResult
        
    AccessControlPolicy

    Error
    */
    HttpResponse res;
    String bodyStr;
    public AWSResponse(HttpResponse r) { 
        res = r;
        bodyStr = res.getBody(); 
    }
    Integer debug = 0;
    /* <Contents><Key>apex/adnDevSignup</Key><LastModified>2008-01-31T09:50:41.000Z</LastModified>'+
    '<ETag>&quot;2d9ab36295e58d32db358aae0195c164&quot;</ETag><Size>27410</Size><Owner><ID>owner_id</ID><DisplayName>vnehess</DisplayName></Owner>'+
    '<StorageClass>STANDARD</StorageClass></Contents>
    */
    public class Contents {  Map <string,string> values; }
    
    public class ListBucketResult { Map <string,string> bucketProperties; List<Contents> contents; }
    public ListBucketResult  parseListBucketResponse (string str ) { 

        Map <string,string> results = new Map <string,string>();
        XmlStreamReader reader = new XmlStreamReader(str);
        reader.setCoalescing(true);
        ListBucketResult lbr = new ListBucketResult();
        lbr.contents = new List<Contents>{};
        while(reader.hasNext()) { 

            if (reader.isStartElement() ) {
                if (reader.getLocalName() == 'Contents') { 
                    Contents c = new Contents();
                    c.values = getContents(reader);
                    lbr.contents.add(c);    
                } else { 
                    if(debug >3) system.debug( 'parseACLResponse '+reader.getEventType() + reader.getLocalName()  );    
                    results.put( reader.getLocalName(), getValue(reader) );
                }
            }
            reader.next();
        }
        
        return lbr;
    }
    
    private Map <string,string>  getContents (xmlstreamreader reader ) { 
        Map <string,string> results = new Map <string,string>();
        while(reader.hasNext()) { 
            if (reader.isEndElement() && reader.getLocalName() == 'Contents')  break;
            if (reader.isStartElement() ) {
                results.put( reader.getLocalName(), getValue(reader) );
            }
            reader.next();
        }
        if(debug > 4) system.debug(results);
        return results;
    }
    private string testListBucketResponse = 
     '<—xml version="1.0" encoding="UTF-8"–>'+ 
    '<ListBucketResult xmlns="http://s3.amazonaws.com/doc/2006-03-01/"><Name>12gkzwnp21m8nw02-test-bucket</Name><Prefix>'+
    '</Prefix><Marker></Marker><MaxKeys>1000</MaxKeys><IsTruncated>false</IsTruncated><Contents><Key>/apex/adnDevSignup</Key>'+
    '<LastModified>2008-01-27T21:13:58.000Z</LastModified><ETag>&quot;630581ddc40fa0a3b7e521c67962baba&quot;</ETag><Size>27411</Size>'+
    '<Owner><ID>173ea00b3418d9a715d5f5a0d85290c3be11135ecf9a085504a4b1bbb6ea1</ID><DisplayName>vnehess</DisplayName></Owner>'+
    '<StorageClass>STANDARD</StorageClass></Contents><Contents><Key>apex/adnDevSignup</Key><LastModified>2008-01-31T09:50:41.000Z</LastModified>'+
    '<ETag>&quot;2d9ab36295e58d32db358aae0195c164&quot;</ETag><Size>27410</Size><Owner><ID>owner_id</ID><DisplayName>vnehess</DisplayName></Owner>'+
    '<StorageClass>STANDARD</StorageClass></Contents><Contents><Key>apex/adnRoot</Key><LastModified>2008-01-31T09:50:40.000Z</LastModified>'+
    '<ETag>&quot;f956a9612c95c206f3208f023d1edefb&quot;</ETag><Size>20036</Size><Owner><ID>owner_id</ID><DisplayName>vnehess</DisplayName></Owner>'+
    '<StorageClass>STANDARD</StorageClass></Contents><Contents><Key>test-key-public</Key><LastModified>2008-02-02T04:02:59.000Z</LastModified>'+
    '<ETag>&quot;12f3e46f80c24c997c4304953edc3612&quot;</ETag><Size>32</Size><Owner><ID>173ea00891b39a715d5f5a0d85290c3be11135ecf9a085504a4b1bbb6ea1</ID>'+
    '<DisplayName>vnehess</DisplayName></Owner><StorageClass>STANDARD</StorageClass></Contents><Contents><Key>test-two</Key>'+
    '<LastModified>2008-02-02T00:40:29.000Z</LastModified><ETag>&quot;327b6f07435811239bc47e1544353273&quot;</ETag><Size>7</Size>'+
    '<Owner><ID>173</ID><DisplayName>vnehess</DisplayName></Owner><StorageClass>STANDARD</StorageClass></Contents></ListBucketResult>';
     
    public class Grant { String owner, displayName, permission; }
    public class AccessControlPolicy { String owner, displayName; List<Grant> grants; }
    
    public AccessControlPolicy parseACLResponse ( string str ) { 
        Map <string,string> results = new Map <string,string>();
        XmlStreamReader reader = new XmlStreamReader(str);
        reader.setCoalescing(true);
        AccessControlPolicy acp = new AccessControlPolicy();
        acp.grants = new List<Grant>{};
        while(reader.hasNext()) { 
            if(debug >3) system.debug( 'parseACLResponse '+reader.getEventType() + reader.getLocalName()  );
            
            //if (reader.isEndElement())  break;
            
            if (reader.isStartElement() ) {
                string n = reader.getLocalName();
            
                if (n=='AccessControlPolicy') {
                    acp.owner = getValue(reader,'ID'); // assumes the order of elements
                    acp.displayName= getValue(reader,'DisplayName');
                }
                
                if (n=='Grantee') {
                    Grant g = new grant(); 
                    g.owner = getValue(reader,'ID'); // assumes the order of elements
                    g.displayName= getValue(reader,'DisplayName');
                    g.permission = getValue(reader,'Permission');
                    acp.grants.add(g);
                }
                
            }
            reader.next();
        }
        if(debug > 4) system.debug(results);
        return acp;
    }

    string getValue(XmlStreamReader reader) { String value; 
        while(reader.hasNext()) {
            if (debug>2) system.debug( 'getValue '+reader.getEventType() );
            if (reader.isEndElement()) break;
            if (reader.isCharacters()) value = reader.getText();
            reader.next();
        } return value;
     }
    string getValue(XmlStreamReader reader, string sn) { 
        String value; 
        while(reader.hasNext()) {
            if (debug > 2) system.debug( 'getValue2 '+reader.getEventType() + reader.getLocalName()  );
            if (reader.isEndElement() && reader.getLocalName() == sn) 
                break;
            if (reader.isCharacters() ) { 
                value = reader.getText();
            }
            reader.next();
        } return value;
    }
     
    private string testACLResponse = 
     '<˜xml version="1.0" encoding="UTF-8"™>'+ 
     '<AccessControlPolicy xmlns="http://s3.amazonaws.com/doc/2006-03-01/"><Owner><ID>owner_id</ID><DisplayName>vnehess</DisplayName></Owner>'+
     '<AccessControlList><Grant><Grantee xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="CanonicalUser"><ID>owner_id</ID>'+
     '<DisplayName>vnehess</DisplayName></Grantee><Permission>FULL_CONTROL</Permission></Grant></AccessControlList></AccessControlPolicy>';
     
    /* return a map that looks like this 
     * 
     {Code=NoSuchKey, 
     HostId=PB4hNZso0Ihimz0LQOoVMMoPOt0BRE3QRHcNp5Ua98tOl9hv0e677fmEA0dhr4oz, 
     Key=test-key, 
     Message=The specified key does not exist., 
     RequestId=49D1F35F2DD55EBD}
     */
    Map <string,string>  parseError ( string str ) { 
        Map <string,string> results = new Map <string,string>();
        XmlStreamReader reader = new XmlStreamReader(str);
        reader.setCoalescing(true);
        while(reader.hasNext()) { 
            if (reader.isEndElement())  break;
            if (reader.isStartElement() ) {
                results.put( reader.getLocalName(), getValue(reader) );
            }
            reader.next();
        }
        if(debug > 4) system.debug(results);
        return results;
    }
    
    private string testErrorResponse = 
     '<?xml version="1.0" encoding="UTF-8"?>'+ 
     '<Error><Code>NoSuchKey</Code><Message>The specified key does not exist.</Message><Key>test-key</Key><RequestId>49D135F2DD55EBD</RequestId>'+
     '<HostId>PB4hNZso0IhimzQOoVMMoPOt0BRE3QRHcNp5Ua98tOl9hv0e677fmEA0dhr4oz</HostId></Error>';
    
    public static testmethod void test1() {
        
        HttpResponse res = new HttpResponse();
        AWSResponse r = new AWSResponse(res); 
        r.debug = 30;
        AWSResponse.ListBucketResult lbr =  r.parseListBucketResponse(r.testListBucketResponse);
        system.debug( lbr);
        for (contents c: lbr.contents) { 
            system.debug( 'Key is ' + c.values.get('Key'));
            for (string s: c.values.keySet()) { 
                system.debug(s + ' is ' +c.values.get(s));
            }   
        }
        system.debug( r.parseACLResponse(r.testACLResponse) );
        system.debug( r.parseError(r.testErrorResponse) );
    }
    
 
}

 Where I tried to call the class from visualforce -> <apex:page controller="AWSResponse">, it gives the error result :

Error: Unknown constructor 'AWSResponse.AWSResponse()

Still not figure it out. Maybe I miss something.. need more helps on this. anyway thanx to Ron and Chris because u help me out..

thanx
edwin
Ron HessRon Hess
that class is not designed to be a controller

you must write your own controller
laxdevlaxdev

Did you get the correct solution. I have also same kind of requirement.

I need to call a external web service from visual force page. How can i populate the webservice resopnse data in a visual force data table. How can i return the data from the custom controller.