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  /*
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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   * Copyright (c) 1997-2010 Oracle and/or its affiliates. All rights reserved.
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   * The contents of this file are subject to the terms of either the GNU
   * General Public License Version 2 only ("GPL") or the Common Development
   * and Distribution License("CDDL") (collectively, the "License").  You
   * may not use this file except in compliance with the License.  You can
  * obtain a copy of the License at
  * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
  * or packager/legal/LICENSE.txt.  See the License for the specific
  * language governing permissions and limitations under the License.
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  * When distributing the software, include this License Header Notice in each
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  * exception as provided by Oracle in the GPL Version 2 section of the License
  * file that accompanied this code.
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  *
  * Contributor(s):
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  * its licensees as provided above.  However, if you add GPL Version 2 code
  * and therefore, elected the GPL Version 2 license, then the option applies
  * only if the new code is made subject to such option by the copyright
  * holder.
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  *
  * This file incorporates work covered by the following copyright and
  * permission notice:
  *
  * Copyright 2004 The Apache Software Foundation
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *     http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
 
 package javax.servlet;
 
Defines an object to assist a servlet in sending a response to the client. The servlet container creates a ServletResponse object and passes it as an argument to the servlet's service method.

To send binary data in a MIME body response, use the ServletOutputStream returned by getOutputStream(). To send character data, use the PrintWriter object returned by getWriter(). To mix binary and text data, for example, to create a multipart response, use a ServletOutputStream and manage the character sections manually.

The charset for the MIME body response can be specified explicitly using the setCharacterEncoding(java.lang.String) and setContentType(java.lang.String) methods, or implicitly using the setLocale(java.util.Locale) method. Explicit specifications take precedence over implicit specifications. If no charset is specified, ISO-8859-1 will be used. The setCharacterEncoding, setContentType, or setLocale method must be called before getWriter and before committing the response for the character encoding to be used.

See the Internet RFCs such as RFC 2045 for more information on MIME. Protocols such as SMTP and HTTP define profiles of MIME, and those standards are still evolving.

Author(s):
Various
See also:
ServletOutputStream
 
public interface ServletResponse {


    
    
Returns the name of the character encoding (MIME charset) used for the body sent in this response. The character encoding may have been specified explicitly using the setCharacterEncoding(java.lang.String) or setContentType(java.lang.String) methods, or implicitly using the setLocale(java.util.Locale) method. Explicit specifications take precedence over implicit specifications. Calls made to these methods after getWriter has been called or after the response has been committed have no effect on the character encoding. If no character encoding has been specified, ISO-8859-1 is returned.

See RFC 2047 (http://www.ietf.org/rfc/rfc2047.txt) for more information about character encoding and MIME.

Returns:
a String specifying the name of the character encoding, for example, UTF-8
  
    public String getCharacterEncoding();
    
    

    
Returns the content type used for the MIME body sent in this response. The content type proper must have been specified using setContentType(java.lang.String) before the response is committed. If no content type has been specified, this method returns null. If a content type has been specified, and a character encoding has been explicitly or implicitly specified as described in getCharacterEncoding() or getWriter() has been called, the charset parameter is included in the string returned. If no character encoding has been specified, the charset parameter is omitted.

Returns:
a String specifying the content type, for example, text/html; charset=UTF-8, or null
Since:
Servlet 2.4
  
    public String getContentType();
    
    

    
Returns a ServletOutputStream suitable for writing binary data in the response. The servlet container does not encode the binary data.

Calling flush() on the ServletOutputStream commits the response. Either this method or getWriter() may be called to write the body, not both.

Returns:
a ServletOutputStream for writing binary data
Throws:
java.lang.IllegalStateException if the getWriter method has been called on this response
java.io.IOException if an input or output exception occurred
See also:
getWriter()
    public ServletOutputStream getOutputStream() throws IOException;
    
    

    
Returns a PrintWriter object that can send character text to the client. The PrintWriter uses the character encoding returned by getCharacterEncoding(). If the response's character encoding has not been specified as described in getCharacterEncoding (i.e., the method just returns the default value ISO-8859-1), getWriter updates it to ISO-8859-1.

Calling flush() on the PrintWriter commits the response.

Either this method or getOutputStream() may be called to write the body, not both.

Returns:
a PrintWriter object that can return character data to the client
Throws:
UnsupportedEncodingException if the character encoding returned by getCharacterEncoding cannot be used
java.lang.IllegalStateException if the getOutputStream method has already been called for this response object
java.io.IOException if an input or output exception occurred
See also:
getOutputStream()
setCharacterEncoding(java.lang.String)
    public PrintWriter getWriter() throws IOException;
    
    
    
    
    
Sets the character encoding (MIME charset) of the response being sent to the client, for example, to UTF-8. If the character encoding has already been set by setContentType(java.lang.String) or setLocale(java.util.Locale), this method overrides it. Calling setContentType(java.lang.String) with the String of text/html and calling this method with the String of UTF-8 is equivalent with calling setContentType with the String of text/html; charset=UTF-8.

This method can be called repeatedly to change the character encoding. This method has no effect if it is called after getWriter has been called or after the response has been committed.

Containers must communicate the character encoding used for the servlet response's writer to the client if the protocol provides a way for doing so. In the case of HTTP, the character encoding is communicated as part of the Content-Type header for text media types. Note that the character encoding cannot be communicated via HTTP headers if the servlet does not specify a content type; however, it is still used to encode text written via the servlet response's writer.

Parameters:
charset a String specifying only the character set defined by IANA Character Sets (http://www.iana.org/assignments/character-sets)
Since:
Servlet 2.4
See also:
setContentType(java.lang.String) .setLocale
    public void setCharacterEncoding(String charset);
    
    


    
Sets the length of the content body in the response In HTTP servlets, this method sets the HTTP Content-Length header.

Parameters:
len an integer specifying the length of the content being returned to the client; sets the Content-Length header
    public void setContentLength(int len);
    
    

    
Sets the content type of the response being sent to the client, if the response has not been committed yet. The given content type may include a character encoding specification, for example, text/html;charset=UTF-8. The response's character encoding is only set from the given content type if this method is called before getWriter is called.

This method may be called repeatedly to change content type and character encoding. This method has no effect if called after the response has been committed. It does not set the response's character encoding if it is called after getWriter has been called or after the response has been committed.

Containers must communicate the content type and the character encoding used for the servlet response's writer to the client if the protocol provides a way for doing so. In the case of HTTP, the Content-Type header is used.

Parameters:
type a String specifying the MIME type of the content
See also:
setLocale(java.util.Locale)
setCharacterEncoding(java.lang.String)
getOutputStream()
getWriter()
    public void setContentType(String type);
    

    
Sets the preferred buffer size for the body of the response. The servlet container will use a buffer at least as large as the size requested. The actual buffer size used can be found using getBufferSize.

A larger buffer allows more content to be written before anything is actually sent, thus providing the servlet with more time to set appropriate status codes and headers. A smaller buffer decreases server memory load and allows the client to start receiving data more quickly.

This method must be called before any response body content is written; if content has been written or the response object has been committed, this method throws an IllegalStateException.

Parameters:
size the preferred buffer size
Throws:
java.lang.IllegalStateException if this method is called after content has been written
See also:
getBufferSize()
flushBuffer()
isCommitted()
reset()
    public void setBufferSize(int size);
    
    

    
Returns the actual buffer size used for the response. If no buffering is used, this method returns 0.

Returns:
the actual buffer size used
See also:
setBufferSize(int)
flushBuffer()
isCommitted()
reset()
    public int getBufferSize();
    
    

    
Forces any content in the buffer to be written to the client. A call to this method automatically commits the response, meaning the status code and headers will be written.

    public void flushBuffer() throws IOException;
    
    
    
    
Clears the content of the underlying buffer in the response without clearing headers or status code. If the response has been committed, this method throws an IllegalStateException.

    public void resetBuffer();
    

    
Returns a boolean indicating if the response has been committed. A committed response has already had its status code and headers written.

Returns:
a boolean indicating if the response has been committed
See also:
setBufferSize(int)
getBufferSize()
flushBuffer()
reset()
    public boolean isCommitted();
    
    

    
Clears any data that exists in the buffer as well as the status code and headers. If the response has been committed, this method throws an IllegalStateException.

Throws:
java.lang.IllegalStateException if the response has already been committed
See also:
setBufferSize(int)
getBufferSize()
flushBuffer()
isCommitted()
    public void reset();
    
    

    
Sets the locale of the response, if the response has not been committed yet. It also sets the response's character encoding appropriately for the locale, if the character encoding has not been explicitly set using setContentType(java.lang.String) or setCharacterEncoding(java.lang.String), getWriter hasn't been called yet, and the response hasn't been committed yet. If the deployment descriptor contains a locale-encoding-mapping-list element, and that element provides a mapping for the given locale, that mapping is used. Otherwise, the mapping from locale to character encoding is container dependent.

This method may be called repeatedly to change locale and character encoding. The method has no effect if called after the response has been committed. It does not set the response's character encoding if it is called after setContentType(java.lang.String) has been called with a charset specification, after setCharacterEncoding(java.lang.String) has been called, after getWriter has been called, or after the response has been committed.

Containers must communicate the locale and the character encoding used for the servlet response's writer to the client if the protocol provides a way for doing so. In the case of HTTP, the locale is communicated via the Content-Language header, the character encoding as part of the Content-Type header for text media types. Note that the character encoding cannot be communicated via HTTP headers if the servlet does not specify a content type; however, it is still used to encode text written via the servlet response's writer.

    public void setLocale(Locale loc);
    
    

    
Returns the locale specified for this response using the setLocale(java.util.Locale) method. Calls made to setLocale after the response is committed have no effect. If no locale has been specified, the container's default locale is returned.

    public Locale getLocale();
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