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309
java/javax/servlet/ServletOutputStream.java
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309
java/javax/servlet/ServletOutputStream.java
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/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package javax.servlet;
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import java.io.CharConversionException;
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import java.io.IOException;
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import java.io.OutputStream;
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import java.text.MessageFormat;
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import java.util.ResourceBundle;
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/**
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* Provides an output stream for sending binary data to the client. A
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* <code>ServletOutputStream</code> object is normally retrieved via the
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* {@link ServletResponse#getOutputStream} method.
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* <p>
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* This is an abstract class that the servlet container implements. Subclasses
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* of this class must implement the <code>java.io.OutputStream.write(int)</code>
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* method.
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*
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* @see ServletResponse
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*/
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public abstract class ServletOutputStream extends OutputStream {
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private static final String LSTRING_FILE = "javax.servlet.LocalStrings";
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private static final ResourceBundle lStrings = ResourceBundle.getBundle(LSTRING_FILE);
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/**
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* Does nothing, because this is an abstract class.
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*/
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protected ServletOutputStream() {
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// NOOP
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}
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/**
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* Writes a <code>String</code> to the client, without a carriage
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* return-line feed (CRLF) character at the end.
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*
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* @param s
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* the <code>String</code> to send to the client
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* @exception IOException
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* if an input or output exception occurred
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*/
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public void print(String s) throws IOException {
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if (s == null) {
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s = "null";
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}
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int len = s.length();
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byte[] buffer = new byte[len];
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for (int i = 0; i < len; i++) {
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char c = s.charAt(i);
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//
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// XXX NOTE: This is clearly incorrect for many strings,
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// but is the only consistent approach within the current
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// servlet framework. It must suffice until servlet output
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// streams properly encode their output.
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//
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if ((c & 0xff00) != 0) { // high order byte must be zero
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String errMsg = lStrings.getString("err.not_iso8859_1");
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Object[] errArgs = new Object[1];
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errArgs[0] = Character.valueOf(c);
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errMsg = MessageFormat.format(errMsg, errArgs);
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throw new CharConversionException(errMsg);
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}
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buffer[i] = (byte) (c & 0xFF);
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}
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write(buffer);
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}
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/**
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* Writes a <code>boolean</code> value to the client, with no carriage
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* return-line feed (CRLF) character at the end.
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*
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* @param b
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* the <code>boolean</code> value to send to the client
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* @exception IOException
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* if an input or output exception occurred
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*/
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public void print(boolean b) throws IOException {
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String msg;
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if (b) {
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msg = lStrings.getString("value.true");
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} else {
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msg = lStrings.getString("value.false");
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}
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print(msg);
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}
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/**
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* Writes a character to the client, with no carriage return-line feed
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* (CRLF) at the end.
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*
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* @param c
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* the character to send to the client
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* @exception IOException
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* if an input or output exception occurred
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*/
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public void print(char c) throws IOException {
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print(String.valueOf(c));
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}
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/**
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* Writes an int to the client, with no carriage return-line feed (CRLF) at
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* the end.
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*
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* @param i
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* the int to send to the client
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* @exception IOException
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* if an input or output exception occurred
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*/
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public void print(int i) throws IOException {
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print(String.valueOf(i));
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}
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/**
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* Writes a <code>long</code> value to the client, with no carriage
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* return-line feed (CRLF) at the end.
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*
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* @param l
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* the <code>long</code> value to send to the client
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* @exception IOException
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* if an input or output exception occurred
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*/
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public void print(long l) throws IOException {
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print(String.valueOf(l));
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}
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/**
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* Writes a <code>float</code> value to the client, with no carriage
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* return-line feed (CRLF) at the end.
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*
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* @param f
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* the <code>float</code> value to send to the client
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* @exception IOException
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* if an input or output exception occurred
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*/
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public void print(float f) throws IOException {
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print(String.valueOf(f));
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}
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/**
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* Writes a <code>double</code> value to the client, with no carriage
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* return-line feed (CRLF) at the end.
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*
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* @param d
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* the <code>double</code> value to send to the client
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* @exception IOException
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* if an input or output exception occurred
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*/
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public void print(double d) throws IOException {
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print(String.valueOf(d));
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}
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/**
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* Writes a carriage return-line feed (CRLF) to the client.
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*
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* @exception IOException
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* if an input or output exception occurred
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*/
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public void println() throws IOException {
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print("\r\n");
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}
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/**
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* Writes a <code>String</code> to the client, followed by a carriage
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* return-line feed (CRLF).
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*
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* @param s
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* the <code>String</code> to write to the client
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* @exception IOException
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* if an input or output exception occurred
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*/
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public void println(String s) throws IOException {
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StringBuilder sb = new StringBuilder();
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sb.append(s);
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sb.append("\r\n");
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print(sb.toString());
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}
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/**
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* Writes a <code>boolean</code> value to the client, followed by a carriage
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* return-line feed (CRLF).
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*
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* @param b
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* the <code>boolean</code> value to write to the client
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* @exception IOException
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* if an input or output exception occurred
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*/
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public void println(boolean b) throws IOException {
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StringBuilder sb = new StringBuilder();
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if (b) {
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sb.append(lStrings.getString("value.true"));
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} else {
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sb.append(lStrings.getString("value.false"));
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}
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sb.append("\r\n");
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print(sb.toString());
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}
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/**
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* Writes a character to the client, followed by a carriage return-line feed
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* (CRLF).
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*
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* @param c
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* the character to write to the client
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* @exception IOException
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* if an input or output exception occurred
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*/
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public void println(char c) throws IOException {
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println(String.valueOf(c));
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}
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/**
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* Writes an int to the client, followed by a carriage return-line feed
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* (CRLF) character.
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*
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* @param i
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* the int to write to the client
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* @exception IOException
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* if an input or output exception occurred
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*/
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public void println(int i) throws IOException {
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println(String.valueOf(i));
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}
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/**
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* Writes a <code>long</code> value to the client, followed by a carriage
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* return-line feed (CRLF).
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*
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* @param l
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* the <code>long</code> value to write to the client
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* @exception IOException
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* if an input or output exception occurred
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*/
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public void println(long l) throws IOException {
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println(String.valueOf(l));
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}
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/**
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* Writes a <code>float</code> value to the client, followed by a carriage
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* return-line feed (CRLF).
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*
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* @param f
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* the <code>float</code> value to write to the client
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* @exception IOException
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* if an input or output exception occurred
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*/
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public void println(float f) throws IOException {
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println(String.valueOf(f));
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}
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/**
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* Writes a <code>double</code> value to the client, followed by a carriage
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* return-line feed (CRLF).
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*
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* @param d
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* the <code>double</code> value to write to the client
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* @exception IOException
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* if an input or output exception occurred
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*/
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public void println(double d) throws IOException {
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println(String.valueOf(d));
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}
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/**
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* Checks if a non-blocking write will succeed. If this returns
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* <code>false</code>, it will cause a callback to
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* {@link WriteListener#onWritePossible()} when the buffer has emptied. If
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* this method returns <code>false</code> no further data must be written
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* until the contain calls {@link WriteListener#onWritePossible()}.
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*
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* @return <code>true</code> if data can be written, else <code>false</code>
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*
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* @since Servlet 3.1
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*/
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public abstract boolean isReady();
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/**
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* Sets the {@link WriteListener} for this {@link ServletOutputStream} and
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* thereby switches to non-blocking IO. It is only valid to switch to
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* non-blocking IO within async processing or HTTP upgrade processing.
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*
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* @param listener The non-blocking IO write listener
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*
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* @throws IllegalStateException If this method is called if neither
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* async nor HTTP upgrade is in progress or
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* if the {@link WriteListener} has already
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* been set
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* @throws NullPointerException If listener is null
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*
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* @since Servlet 3.1
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*/
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public abstract void setWriteListener(javax.servlet.WriteListener listener);
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}
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