org.springframework.remoting.httpinvoker
Class SimpleHttpInvokerRequestExecutor

java.lang.Object
  org.springframework.remoting.httpinvoker.AbstractHttpInvokerRequestExecutor
      org.springframework.remoting.httpinvoker.SimpleHttpInvokerRequestExecutor

All Implemented Interfaces:

HttpInvokerRequestExecutor

public class SimpleHttpInvokerRequestExecutor
extends AbstractHttpInvokerRequestExecutor

HttpInvokerRequestExecutor implementation that uses standard J2SE facilities to execute POST requests, without support for HTTP authentication or advanced configuration options.

Designed for easy subclassing, customizing specific template methods. However, consider CommonsHttpInvokerRequestExecutor for more sophisticated needs: The J2SE HttpURLConnection is rather limited in its capabilities.

Since:

1.1

Author:

Juergen Hoeller

See Also:

CommonsHttpInvokerRequestExecutor, HttpURLConnection

Field Summary

Fields inherited from class org.springframework.remoting.httpinvoker.AbstractHttpInvokerRequestExecutor

CONTENT_TYPE_SERIALIZED_OBJECT, HTTP_HEADER_CONTENT_LENGTH, HTTP_HEADER_CONTENT_TYPE, HTTP_METHOD_POST, logger

Constructor Summary

SimpleHttpInvokerRequestExecutor()

Method Summary

protected RemoteInvocationResult	doExecuteRequest(HttpInvokerClientConfiguration config, ByteArrayOutputStream baos) Execute the given request through a standard J2SE HttpURLConnection.
protected HttpURLConnection	openConnection(HttpInvokerClientConfiguration config) Open an HttpURLConnection for the given remote invocation request.
protected void	prepareConnection(HttpURLConnection con, int contentLength) Prepare the given HTTP connection.
protected InputStream	readResponseBody(HttpInvokerClientConfiguration config, HttpURLConnection con) Extract the response body from the given executed remote invocation request.
protected void	validateResponse(HttpInvokerClientConfiguration config, HttpURLConnection con) Validate the given response as contained in the HttpURLConnection object, throwing an exception if it does not correspond to a successful HTTP response.
protected void	writeRequestBody(HttpInvokerClientConfiguration config, HttpURLConnection con, ByteArrayOutputStream baos) Set the given serialized remote invocation as request body.

Methods inherited from class org.springframework.remoting.httpinvoker.AbstractHttpInvokerRequestExecutor

createObjectInputStream, decorateInputStream, decorateOutputStream, doReadRemoteInvocationResult, doWriteRemoteInvocation, executeRequest, getByteArrayOutputStream, readRemoteInvocationResult, writeRemoteInvocation

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

SimpleHttpInvokerRequestExecutor

public SimpleHttpInvokerRequestExecutor()

Method Detail

doExecuteRequest

protected RemoteInvocationResult doExecuteRequest(HttpInvokerClientConfiguration config,
                                                  ByteArrayOutputStream baos)
                                           throws IOException,
                                                  ClassNotFoundException

Execute the given request through a standard J2SE HttpURLConnection.

This method implements the basic processing workflow: The actual work happens in this class's template methods.

Specified by:

doExecuteRequest in class AbstractHttpInvokerRequestExecutor

Parameters:

config - the HTTP invoker configuration that specifies the target service

baos - the ByteArrayOutputStream that contains the serialized RemoteInvocation object

Returns:

the RemoteInvocationResult object

Throws:

IOException - if thrown by I/O operations

ClassNotFoundException - if thrown during deserialization

See Also:

openConnection(org.springframework.remoting.httpinvoker.HttpInvokerClientConfiguration), prepareConnection(java.net.HttpURLConnection, int), writeRequestBody(org.springframework.remoting.httpinvoker.HttpInvokerClientConfiguration, java.net.HttpURLConnection, java.io.ByteArrayOutputStream), validateResponse(org.springframework.remoting.httpinvoker.HttpInvokerClientConfiguration, java.net.HttpURLConnection), readResponseBody(org.springframework.remoting.httpinvoker.HttpInvokerClientConfiguration, java.net.HttpURLConnection)

openConnection

protected HttpURLConnection openConnection(HttpInvokerClientConfiguration config)
                                    throws IOException

Open an HttpURLConnection for the given remote invocation request.

Parameters:

config - the HTTP invoker configuration that specifies the target service

Returns:

the HttpURLConnection for the given request

Throws:

IOException - if thrown by I/O methods

See Also:

URL.openConnection()

prepareConnection

protected void prepareConnection(HttpURLConnection con,
                                 int contentLength)
                          throws IOException

Prepare the given HTTP connection.

The default implementation specifies POST as method, "application/x-java-serialized-object" as "Content-Type" header, and the given content length as "Content-Length" header.

Parameters:

con - the HTTP connection to prepare

contentLength - the length of the content to send

Throws:

IOException - if thrown by HttpURLConnection methods

See Also:

HttpURLConnection.setRequestMethod(java.lang.String), URLConnection.setRequestProperty(java.lang.String, java.lang.String)

writeRequestBody

protected void writeRequestBody(HttpInvokerClientConfiguration config,
                                HttpURLConnection con,
                                ByteArrayOutputStream baos)
                         throws IOException

Set the given serialized remote invocation as request body.

The default implementation simply write the serialized invocation to the HttpURLConnection's OutputStream. This can be overridden, for example, to write a specific encoding and potentially set appropriate HTTP request headers.

Parameters:

config - the HTTP invoker configuration that specifies the target service

con - the HttpURLConnection to write the request body to

baos - the ByteArrayOutputStream that contains the serialized RemoteInvocation object

Throws:

IOException - if thrown by I/O methods

See Also:

URLConnection.getOutputStream(), URLConnection.setRequestProperty(java.lang.String, java.lang.String)

validateResponse

protected void validateResponse(HttpInvokerClientConfiguration config,
                                HttpURLConnection con)
                         throws IOException

Validate the given response as contained in the HttpURLConnection object, throwing an exception if it does not correspond to a successful HTTP response.

Default implementation rejects any HTTP status code beyond 2xx, to avoid parsing the response body and trying to deserialize from a corrupted stream.

Parameters:

config - the HTTP invoker configuration that specifies the target service

con - the HttpURLConnection to validate

Throws:

IOException - if validation failed

See Also:

HttpURLConnection.getResponseCode()

readResponseBody

protected InputStream readResponseBody(HttpInvokerClientConfiguration config,
                                       HttpURLConnection con)
                                throws IOException

Extract the response body from the given executed remote invocation request.

The default implementation simply reads the serialized invocation from the HttpURLConnection's InputStream. This can be overridden, for example, to check for GZIP response encoding and wrap the returned InputStream in a GZIPInputStream.

Parameters:

config - the HTTP invoker configuration that specifies the target service

con - the HttpURLConnection to read the response body from

Returns:

an InputStream for the response body

Throws:

IOException - if thrown by I/O methods

See Also:

URLConnection.getInputStream(), HttpURLConnection.getHeaderField(int), HttpURLConnection.getHeaderFieldKey(int)