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*
* 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
*
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*
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package javax.servlet;
import java.io.
OutputStream;
import java.io.
IOException;
import java.io.
CharConversionException;
import java.text.
MessageFormat;
import java.util.
ResourceBundle;
/**
* Provides an output stream for sending binary data to the
* client. A <code>ServletOutputStream</code> object is normally retrieved
* via the {@link ServletResponse#getOutputStream} method.
*
* <p>This is an abstract class that the servlet container implements.
* Subclasses of this class
* must implement the <code>java.io.OutputStream.write(int)</code>
* method.
*
*
* @author Various
*
* @see ServletResponse
*
*/
public abstract class
ServletOutputStream extends
OutputStream {
private static final
String LSTRING_FILE = "javax.servlet.LocalStrings";
private static
ResourceBundle lStrings =
ResourceBundle.
getBundle(
LSTRING_FILE);
/**
*
* Does nothing, because this is an abstract class.
*
*/
protected
ServletOutputStream() { }
/**
* Writes a <code>String</code> to the client,
* without a carriage return-line feed (CRLF)
* character at the end.
*
*
* @param s the <code>String</code> to send to the client
*
* @exception IOException if an input or output exception occurred
*
*/
public void
print(
String s) throws
IOException {
if (
s==null)
s="null";
int
len =
s.
length();
for (int
i = 0;
i <
len;
i++) {
char
c =
s.
charAt (
i);
//
// XXX NOTE: This is clearly incorrect for many strings,
// but is the only consistent approach within the current
// servlet framework. It must suffice until servlet output
// streams properly encode their output.
//
if ((
c & 0xff00) != 0) { // high order byte must be zero
String errMsg =
lStrings.
getString("err.not_iso8859_1");
Object[]
errArgs = new
Object[1];
errArgs[0] =
Character.
valueOf(
c);
errMsg =
MessageFormat.
format(
errMsg,
errArgs);
throw new
CharConversionException(
errMsg);
}
write (
c);
}
}
/**
* Writes a <code>boolean</code> value to the client,
* with no carriage return-line feed (CRLF)
* character at the end.
*
* @param b the <code>boolean</code> value
* to send to the client
*
* @exception IOException if an input or output exception occurred
*
*/
public void
print(boolean
b) throws
IOException {
String msg;
if (
b) {
msg =
lStrings.
getString("value.true");
} else {
msg =
lStrings.
getString("value.false");
}
print(
msg);
}
/**
* Writes a character to the client,
* with no carriage return-line feed (CRLF)
* at the end.
*
* @param c the character to send to the client
*
* @exception IOException if an input or output exception occurred
*
*/
public void
print(char
c) throws
IOException {
print(
String.
valueOf(
c));
}
/**
*
* Writes an int to the client,
* with no carriage return-line feed (CRLF)
* at the end.
*
* @param i the int to send to the client
*
* @exception IOException if an input or output exception occurred
*
*/
public void
print(int
i) throws
IOException {
print(
String.
valueOf(
i));
}
/**
*
* Writes a <code>long</code> value to the client,
* with no carriage return-line feed (CRLF) at the end.
*
* @param l the <code>long</code> value
* to send to the client
*
* @exception IOException if an input or output exception
* occurred
*
*/
public void
print(long
l) throws
IOException {
print(
String.
valueOf(
l));
}
/**
*
* Writes a <code>float</code> value to the client,
* with no carriage return-line feed (CRLF) at the end.
*
* @param f the <code>float</code> value
* to send to the client
*
* @exception IOException if an input or output exception occurred
*
*
*/
public void
print(float
f) throws
IOException {
print(
String.
valueOf(
f));
}
/**
*
* Writes a <code>double</code> value to the client,
* with no carriage return-line feed (CRLF) at the end.
*
* @param d the <code>double</code> value
* to send to the client
*
* @exception IOException if an input or output exception occurred
*
*/
public void
print(double
d) throws
IOException {
print(
String.
valueOf(
d));
}
/**
* Writes a carriage return-line feed (CRLF)
* to the client.
*
*
*
* @exception IOException if an input or output exception occurred
*
*/
public void
println() throws
IOException {
print("\r\n");
}
/**
* Writes a <code>String</code> to the client,
* followed by a carriage return-line feed (CRLF).
*
*
* @param s the <code>String</code> to write to the client
*
* @exception IOException if an input or output exception occurred
*
*/
public void
println(
String s) throws
IOException {
print(
s);
println();
}
/**
*
* Writes a <code>boolean</code> value to the client,
* followed by a
* carriage return-line feed (CRLF).
*
*
* @param b the <code>boolean</code> value
* to write to the client
*
* @exception IOException if an input or output exception occurred
*
*/
public void
println(boolean
b) throws
IOException {
print(
b);
println();
}
/**
*
* Writes a character to the client, followed by a carriage
* return-line feed (CRLF).
*
* @param c the character to write to the client
*
* @exception IOException if an input or output exception occurred
*
*/
public void
println(char
c) throws
IOException {
print(
c);
println();
}
/**
*
* Writes an int to the client, followed by a
* carriage return-line feed (CRLF) character.
*
*
* @param i the int to write to the client
*
* @exception IOException if an input or output exception occurred
*
*/
public void
println(int
i) throws
IOException {
print(
i);
println();
}
/**
*
* Writes a <code>long</code> value to the client, followed by a
* carriage return-line feed (CRLF).
*
*
* @param l the <code>long</code> value to write to the client
*
* @exception IOException if an input or output exception occurred
*
*/
public void
println(long
l) throws
IOException {
print(
l);
println();
}
/**
*
* Writes a <code>float</code> value to the client,
* followed by a carriage return-line feed (CRLF).
*
* @param f the <code>float</code> value
* to write to the client
*
*
* @exception IOException if an input or output exception
* occurred
*
*/
public void
println(float
f) throws
IOException {
print(
f);
println();
}
/**
*
* Writes a <code>double</code> value to the client,
* followed by a carriage return-line feed (CRLF).
*
*
* @param d the <code>double</code> value
* to write to the client
*
* @exception IOException if an input or output exception occurred
*
*/
public void
println(double
d) throws
IOException {
print(
d);
println();
}
/**
* This method can be used to determine if data can be written without blocking.
*
* @return <code>true</code> if a write to this <code>ServletOutputStream</code>
* will succeed, otherwise returns <code>false</code>.
*
* @since Servlet 3.1
*/
public abstract boolean
isReady();
/**
* Instructs the <code>ServletOutputStream</code> to invoke the provided
* {@link WriteListener} when it is possible to write
*
*
* @param writeListener the {@link WriteListener} that should be notified
* when it's possible to write
*
* @exception IllegalStateException if one of the following conditions is true
* <ul>
* <li>the associated request is neither upgraded nor the async started
* <li>setWriteListener is called more than once within the scope of the same request.
* </ul>
*
* @throws NullPointerException if writeListener is null
*
* @since Servlet 3.1
*/
public abstract void
setWriteListener(
WriteListener writeListener);
}