aXMLRPC

by gturri

gturri / aXMLRPC

A lightweight Java XML-RPC client for the use with Android. Since there is absolutely no dependency ...

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What is aXMLRPC?

aXMLRPC is a Java library with a leightweight XML-RPC client. XML-RPC is a specification for making remote procedure calls over the HTTP protocol in an XML format. The specificationc can be found under http://www.xmlrpc.com/spec.

The library was developed for the use with Android. Since it has no dependencies to any Android library or any other 3rd-party library, it is fully functional in any common java virtual machine (not only on Android).

You can control the client with some flags to extend its functionality. See the section about flags.

How to include it?

How to include the aXMLRPC client into your project? There are several ways to do that:

Include the source code

You can just include all the source code from the

src
directory into the sourcecode of your project. If you use git yourself, you can use submodules to include the code as a module to yours. So you will always stay up to date with the library.

Compile it as library

aXMLRPC uses maven, so you can build it using

mvn install

Use Maven

To use it on your Maven project, add it as a dependency on your pom.xml file:

    fr.turri
    aXMLRPC
    X.Y.Z

where X.Y.Z is the current aXMLRPC version

How to use the library?

You can use the library by initiating an

XMLRPCClient
and make calls over it:
try {
    XMLRPCClient client = new XMLRPCClient(new URL("http://example.com/xmlrpc"));

Boolean b = (Boolean)client.call("isServerOk");
Integer i = (Integer)client.call("add", 5, 10);

} catch(XMLRPCServerException ex) { // The server throw an error. } catch(XMLRPCException ex) { // An error occured in the client. } catch(Exception ex) { // Any other exception }

Instead of passing the parameters as seperated values, you can also pack them in an array and pass the array to the method, like in the following example:

// ... The try-catch has been ommited for clarity.
XMLRPCClient client = new XMLRPCClient(url, "MyUserAgentString");
client.call("someMethod", new Object[]{ o1, o2, o3 });
// ...

Asynchronous Calls

The above method calls are synchronous. So the method

call
will return when the server responded or an error occured. There is also a possibility for asynchronous server calls. You need to implement an XMLRPCCallback that will get noticed about the respone (or error) from the server. The
callAsync
method can be used to make asynchronous calls. It returns an identifier that will also be send to the XMLRPCCallback instance with the response of the server, so your application can make multiple calls concurrently and use one listener for them, that distinguish between the different request by their ids.
XMLRPCCallback listener = new XMLRPCCallback() {
    public void onResponse(long id, Object result) {
        // Handling the servers response
    }
    public void onError(long id, XMLRPCException error) {
        // Handling any error in the library
    }
    public void onServerError(long id, XMLRPCServerException error) {
        // Handling an error response from the server
    }
};

XMLRPCClient client = new XMLRPCClient(url); long id = client.callAsync(listener, "add", 5, 10);

You will be also able to cancel an asynchonous call. Just use the

cancel
method on the
XMLRPCClient
instance, like in the following example. The listener will not be notified, if the call is canceled.
XMLRPCClient client = new XMLRPCClient(url);
long id = client.callAsync(listener, "method", params);
// ...
client.cancel(id);

The data types

The specification give some data tags for the server response. If you want to work on the type you must cast the returning

Object
from the
call
method to its specific type. Which type to cast which XML server response, tells the following list:

i4
,
int
=>
Integer

boolean
=>
Boolean

string
=>
String

double
=>
Double

dateTime.iso8601
=>
Date

base64
=>
byte[]
(
Byte[]
won't work)

array
=>
Object[]

struct
=>
Map

i8
=>
Long
(see Flags)

Flags

The client takes as second parameter (or third if an user agent is given) a combination of multiple flags. It could work like the following example:

// ...
XMLRPCClient client = new XMLRPCClient(url, 
    XMLRPCClient.FLAGS_STRICT | XMLRPCClient.FLAGS_8BYTE_INT);
// ...

The following flags are implemented:

FLAGS_STRICT

The client should parse responses strict to specification. It will check if the given content-type is right. The method name in a call must only contain of A-Z, a-z, 0-9, _, ., :, / Normally this is not needed.

FLAGS8BYTEINT

The client will be able to handle 8 byte integer values (longs). The xml type tag

 will be used. This is not in the specification
but some libraries and servers support this behaviour.
If this isn't enabled you cannot recieve 8 byte integers and if you try to
send a long, the value must be within the 4 byte integer range.

FLAGSENABLECOOKIES

With this flag, the client will be able to handle cookies, meaning saving cookies from the server and sending it with every other request again. This is needed for some XML-RPC interfaces that support login.

FLAGS_NIL

The client will be able to send

null
values. A
null
value will be send as
. This extension is described under: http://ontosys.com/xml-rpc/extensions.php

FLAGSIGNORESTATUSCODE

With this flag enabled, the XML-RPC client will ignore the HTTP status code of the response from the server. According to specification the status code must be 200. This flag is only needed for the use with not standard compliant servers.

FLAGS_FORWARD

With this flag enabled, the client will forward the request, if the 301 or 302 HTTP status code has been received. If this flag is not set, the client will throw an exception on these HTTP status codes.

FLAGSSSLIGNOREINVALIDHOST

With this flag enabled, the client will ignore, if the URL doesn't match the SSL Certificate. This should be used with caution. Normally the URL should always match the URL in the SSL certificate, even with self signed certificates.

FLAGSSSLINGOREINVALIDCERT

With this flag enabled, the client will ignore all unverified SSL/TLS certificates. This must be used, if you use self-signed certificates or certificated from unknown (or untrusted) authorities.

FLAGSDEFAULTTYPE_STRING

With this flag enabled, a value with a missing type tag, will be parsed as a string element. This is just for incoming messages. Outgoing messages will still be generated according to specification.

FLAGSIGNORENAMESPACES

With this flag enabled, the client ignores all namespaces used within the response from the server.

FLAGSUSESYSTEM_PROXY

With this flag enabled, the XMLRPCClient will use the system http proxy to connect to the XML-RPC server.

FLAGSNOSTRING_ENCODE

By default outgoing string values will be encoded according to specification. Meaning the & sign will be encoded to

&
and the "less then" sign to
<
. If you set this flag, the encoding won't be done for outgoing string values. See
FLAGS_NO_STRING_DECODE
for the counterpart.

FLAGSNOSTRING_DECODE

This prevents the decoding of incoming strings, meaning

&
and
<
won't be decoded to the & sign and the "less then" sign. See
FLAGS_NO_STRING_ENCODE
for the counterpart.

FLAGS_DEBUG

Will display additional information on the console. Do not use it in production.

FLAGSACCEPTNULL_DATE

By default a response with an empty date (eg:

)
is invalid and hence throws an exception.
With this flag, this input is accepted, and returns a null date

Meta Flags

This can be used exactly the same as normal flags. But each meta flag is just a collection of different other flags. There is no functional difference in using a meta flag or all the containing flags. For detailed documentation on the single flags read the above section.

FLAGSSSLIGNORE_ERRORS

This flag disables all SSL warnings. It is an alternative to use FLAGSSSLIGNOREINVALIDCERT | FLAGSSSLIGNOREINVALIDHOST.

FLAGSAPACHEWS

This flag should be used if the server is an apache ws xmlrpc server. This will set some flags, so that the not standard conform behavior of the server will be ignored. This will enable the following flags: FLAGSIGNORENAMESPACES, FLAGSNIL, FLAGSDEFAULTTYPESTRING

Using an arbitrary transport

aXMLRPC uses http with the java.net API. If you want to use another protocol or API, you can do:

    boolean debug = false;
    SerializerHandler serializerHandler = new SerializerHandler(); // or you may build it with flags
    String payload = new Call(serializerHandler, "add", 5, 10).getXML(debug);

InputStream istream = sendPayloadWithMyTransport(payload); // use your implementation here

Integer i = (Integer) new ResponseParser.parse(serializerHandler, istream, debug);

License

The library is licensed under MIT License. See the LICENSE file for the license text.

For the uninformed reader: What does MIT mean?

  • You can copy this, modify it, distribute it, sell it, eat it.
  • You don't need to notice me about anything of the above.
  • If you make changes to it, it would be nice (but not obliged), if you would share it with me again.
  • Put the copyright notice and the LICENSE file in any copy you make.

Bugs?

If you find a bug or wish some enhancements for the library, please fill an issue here on github.

Build status

Status: Status

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