MessagePack Java Jackson 在不关闭输出流（output stream）的情

com.fasterxml.jackson.databind.ObjectMapper?在默认的情况下在写出输入后将会关闭输出流（output stream）。

如果你希望序列化多值变量在同一个输出流的情况下，你不希望在输出完一个就关闭输出流，你可以设置??JsonGenerator.Feature.AUTO_CLOSE_TARGET?参数为 False。

本测试方法，可以在?https://github.com/cwiki-us-demo/serialize-deserialize-demo-java/blob/master/src/test/java/com/insight/demo/serialize/MessagePackSerializer.java?中找到。

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/**
 * Serialization Not Close output stream
 */
@Test
public void testMessagePackSerializationNotCloSEOutputStream() {
    logger.debug("testMessagePackSerializationNotCloSEOutputStream");

    try {
        File tempFile = File.createTempFile("messagepack-","-cwiki.us");

        OutputStream out = new FileOutputStream(tempFile);
        ObjectMapper objectMapper = new ObjectMapper(new MessagePackFactory());
        objectMapper.configure(JsonGenerator.Feature.AUTO_CLOSE_TARGET,false);

        objectMapper.writeValue(out,1);
        objectMapper.writeValue(out,"two");
        objectMapper.writeValue(out,3.14);
        out.close();

        MessageUnpacker unpacker = MessagePack.newDefaultUnpacker(new FileInputStream(tempFile));
        System.out.println(unpacker.unpackInt());      // => 1
        System.out.println(unpacker.unpackString());   // => two
        System.out.println(unpacker.unpackFloat());    // => 3.14

        tempFile.deleteOnExit();
    } catch (IOException ex) {
        logger.error("Serialize Error",ex);
    }
}

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https://www.cwiki.us/display/Serialization/MessagePack+Jackson+Dataformat