Examples of org.springframework.messaging.MessageHeaders

org.springframework.messaging.MessageHeaders

The headers for a {@link Message}.

IMPORTANT: This class is immutable. Any mutating operation such as {@code put(..)}, {@code putAll(..)} and others will throw{@link UnsupportedOperationException}.

Subclasses do have access to the raw headers, however, via {@link #getRawHeaders()}.

One way to create message headers is to use the {@link org.springframework.messaging.support.MessageBuilder MessageBuilder}:

 MessageBuilder.withPayload("foo").setHeader("key1", "value1").setHeader("key2", "value2");

A second option is to create {@link org.springframework.messaging.support.GenericMessage}passing a payload as {@link Object} and headers as a {@link Map java.util.Map}:

 Map headers = new HashMap(); headers.put("key1", "value1"); headers.put("key2", "value2"); new GenericMessage("foo", headers);

A third option is to use {@link org.springframework.messaging.support.MessageHeaderAccessor}or one of its subclasses to create specific categories of headers. @author Arjen Poutsma @author Mark Fisher @author Gary Russell @since 4.0 @see org.springframework.messaging.support.MessageBuilder @see org.springframework.messaging.support.MessageHeaderAccessor

    SimpleAmqpHeaderMapper headerMapper = new SimpleAmqpHeaderMapper();
    Map<String, Object> headerMap = new HashMap<String, Object>();


    headerMap.put(AmqpHeaders.CONTENT_TYPE, "text/html");


    MessageHeaders messageHeaders = new MessageHeaders(headerMap);
    MessageProperties amqpProperties = new MessageProperties();
    headerMapper.fromHeaders(messageHeaders, amqpProperties);


    assertEquals("text/html", amqpProperties.getContentType());
  }

    JsonMessageConverter converter = new JsonMessageConverter();
    MessageProperties amqpProperties = new MessageProperties();
    converter.toMessage("123", amqpProperties);
    Map<String, Object> headerMap = new HashMap<String, Object>();
    headerMap.put("__TypeId__", "java.lang.Integer");
    MessageHeaders messageHeaders = new MessageHeaders(headerMap);
    headerMapper.fromHeaders(messageHeaders, amqpProperties);
    assertEquals("java.lang.String", amqpProperties.getHeaders().get("__TypeId__"));
    Object result = converter.fromMessage(new Message("123".getBytes(), amqpProperties));
    assertEquals(String.class, result.getClass());
  }

Examples of org.springframework.messaging.MessageHeaders

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