MessagePack Java Jackson 在不关闭输入流（input stream）的情况下反序列化多变量

Posted 2022-06-25 huyuchengus

com.fasterxml.jackson.databind.ObjectMapper 在读取输入流变量的时候默认的将会关闭输入流。

如果你不希望关闭输入流，你可以设置 JsonParser.Feature.AUTO_CLOSE_SOURCE 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。

 

/**
 * Serialization Not Close input stream
 */
@Test
public void testMessagePackSerializationNotCloseInputStream() 
    logger.debug("testMessagePackSerializationNotCloseInputStream");

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

        MessagePacker packer = MessagePack.newDefaultPacker(new FileOutputStream(tempFile));
        packer.packInt(42);
        packer.packString("Hello");
        packer.close();

        FileInputStream in = new FileInputStream(tempFile);
        ObjectMapper objectMapper = new ObjectMapper(new MessagePackFactory());
        objectMapper.configure(JsonParser.Feature.AUTO_CLOSE_SOURCE, false);
        System.out.println(objectMapper.readValue(in, Integer.class));
        System.out.println(objectMapper.readValue(in, String.class));
        in.close();

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

 

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