我也没有看到任何明确的文档。但是你需要使用OperationResponse来获得流。这里有一个例子。

public class ReadContent {

    public static void main(final String[] args) throws Exception {

        try (ModelControllerClient client = ModelControllerClient.Factory.create("localhost", 9990)) {
            try (
                    StreamEntry entry = readContent(client, "kitchensink.war", "META-INF/MANIFEST.MF");
                    InputStream in = entry.getStream();
            ) {
                int len;
                final byte[] buffer = new byte[256];
                while ((len = in.read(buffer)) != -1) {
                    System.out.write(buffer, 0, len);
                }
            }
        }
    }

    private static StreamEntry readContent(final ModelControllerClient client, final String deploymentName, final String path) throws IOException {
        final ModelNode address = Operations.createAddress("deployment", deploymentName);
        final ModelNode op = Operations.createOperation(ClientConstants.READ_CONTENT_OPERATION, address);
        op.get(ClientConstants.PATH).set(path);

        // Execute the operation
        final OperationResponse response = client.executeOperation(Operation.Factory.create(op), OperationMessageHandler.logging);

        // Get the response node to evaluate the outcome
        final ModelNode outcome = response.getResponseNode();
        if (Operations.isSuccessfulOutcome(outcome)) {
            // Read the result and get the UUID the stream is attached to
            final String uuid = Operations.readResult(outcome).get(ClientConstants.UUID).asString();
            return response.getInputStream(uuid);
        }

        // The operation has failed, raise and exception with the failure description
        throw new RuntimeException("Failed to read the content: " + Operations.getFailureDescription(outcome).asString());
    }
}