记录下-字符串(String)和ByteBuffer(NIO 缓冲区)之间的转换

记录下-字符串(String)和ByteBuffer(NIO 缓冲区)之间的转换

    @Test
    public void byteBufferString(){
//        1.字符串转为ByteBuffer
        ByteBuffer buffer = ByteBuffer.allocate(21);
        buffer.put("马上行计划管理".getBytes(StandardCharsets.UTF_8));
//        写模式 → 读模式
        buffer.flip();
//        2. Charset
        ByteBuffer charsetsBuffer = StandardCharsets.UTF_8.encode("马上行计划管理");
        Assert.isTrue(buffer.equals(charsetsBuffer),"转换失败");
//        3.wrap
        ByteBuffer wrapBuffer = ByteBuffer.wrap("马上行计划管理".getBytes(StandardCharsets.UTF_8));
        Assert.isTrue(wrapBuffer.equals(charsetsBuffer),"转换失败");

//        转字符串
//        1.
        String result = StandardCharsets.UTF_8.decode(buffer).toString();
        log.info(result);
//        2.
        byte[] bytes = new byte[charsetsBuffer.remaining()];
        charsetsBuffer.get(bytes);
        String result2 = new String(bytes, StandardCharsets.UTF_8);
        log.info(result2);
        Assert.isTrue(result2.equals(result),"转换失败");
    }