spring TextMessage 源码
spring TextMessage 代码
文件路径：/spring-websocket/src/main/java/org/springframework/web/socket/TextMessage.java
/*
* Copyright 2002-2017 the original author or authors.
*
* 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
*
* https://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 org.springframework.web.socket;
import java.nio.charset.StandardCharsets;
import org.springframework.lang.Nullable;
/**
* A text WebSocket message.
*
* @author Rossen Stoyanchev
* @since 4.0
*/
public final class TextMessage extends AbstractWebSocketMessage<String> {
@Nullable
private final byte[] bytes;
/**
* Create a new text WebSocket message from the given CharSequence payload.
* @param payload the non-null payload
*/
public TextMessage(CharSequence payload) {
super(payload.toString(), true);
this.bytes = null;
}
/**
* Create a new text WebSocket message from the given byte[]. It is assumed
* the byte array can be encoded into an UTF-8 String.
* @param payload the non-null payload
*/
public TextMessage(byte[] payload) {
super(new String(payload, StandardCharsets.UTF_8));
this.bytes = payload;
}
/**
* Create a new text WebSocket message with the given payload representing the
* full or partial message content. When the {@code isLast} boolean flag is set
* to {@code false} the message is sent as partial content and more partial
* messages will be expected until the boolean flag is set to {@code true}.
* @param payload the non-null payload
* @param isLast whether this the last part of a series of partial messages
*/
public TextMessage(CharSequence payload, boolean isLast) {
super(payload.toString(), isLast);
this.bytes = null;
}
@Override
public int getPayloadLength() {
return asBytes().length;
}
public byte[] asBytes() {
return (this.bytes != null ? this.bytes : getPayload().getBytes(StandardCharsets.UTF_8));
}
@Override
protected String toStringPayload() {
String payload = getPayload();
return (payload.length() > 10 ? payload.substring(0, 10) + ".." : payload);
}
}
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