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## org.springframework.remoting.httpinvoker
Class SimpleHttpInvokerRequestExecutor

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

All Implemented Interfaces:
  BeanClassLoaderAware, 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, ENCODING_GZIP, HTTP_HEADER_ACCEPT_ENCODING, HTTP_HEADER_CONTENT_ENCODING, 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 boolean` | `isGzipResponse(HttpURLConnection con)` Determine whether the given response is a GZIP response.
`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, getBeanClassLoader, getByteArrayOutputStream, getContentType, isAcceptGzipEncoding, readRemoteInvocationResult, setAcceptGzipEncoding, setBeanClassLoader, setContentType, 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. If the response is recognized as GZIP response, the InputStream will get wrapped 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:
    `isGzipResponse(java.net.HttpURLConnection)`, `GZIPInputStream`, `URLConnection.getInputStream()`, `HttpURLConnection.getHeaderField(int)`, `HttpURLConnection.getHeaderFieldKey(int)`

### isGzipResponse

    protected boolean isGzipResponse(HttpURLConnection con)

  Determine whether the given response is a GZIP response.

  Default implementation checks whether the HTTP "Content-Encoding" header contains "gzip" (in any casing).

  Parameters:
    `con` - the HttpURLConnection to check

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