@Override
	public Writer append(final CharSequence value, final int start, final int end) {
		builder.append(value, start, end);
		return this;
	}
Appends a portion of a character sequence to the {@link StringBuilder}.
@param value The character to append
@param start The index of the first character
@param end The index of the last character + 1
@return This writer instance
spring-cloud-alibaba-starters/spring-cloud-alibaba-commons/src/main/java/com/alibaba/cloud/commons/io/StringBuilderWriter.java