jms消息组成
一个Message对象有三个部分:消息头,消息属性,消息体,消息头提供了和消息有关的元数据,消息属性可以携带由jms客户端设置的属性,jms消费者可以根据消息头和消息属性选择来选择接受消息
消息头:包括自动分配的消息头及开发者分配的消息头
public interface Message { public abstract String getJMSMessageID() throws JMSException; public abstract void setJMSMessageID(String s) throws JMSException; public abstract long getJMSTimestamp() throws JMSException; public abstract void setJMSTimestamp(long l)//jms提供者接受消息的时间 throws JMSException; public abstract byte[] getJMSCorrelationIDAsBytes() throws JMSException; public abstract void setJMSCorrelationIDAsBytes(byte abyte0[]) throws JMSException; public abstract void setJMSCorrelationID(String s)//开发者分配,将当前的id与之前的特定id进行关联 throws JMSException; public abstract String getJMSCorrelationID() throws JMSException; public abstract Destination getJMSReplyTo() throws JMSException; public abstract void setJMSReplyTo(Destination destination)//开发者分配的消息头,表明jms消费者应该应答的地址 throws JMSException; public abstract Destination getJMSDestination() throws JMSException; public abstract void setJMSDestination(Destination destination)//目的地 throws JMSException; public abstract int getJMSDeliveryMode() throws JMSException; public abstract void setJMSDeliveryMode(int i)//持久性模式(消息不会丢失,默认)和非持久性模式 throws JMSException; public abstract boolean getJMSRedelivered() throws JMSException; public abstract void setJMSRedelivered(boolean flag)//是否被重新传送 throws JMSException; public abstract String getJMSType() throws JMSException; public abstract void setJMSType(String s)//开发者分配,消息类型 throws JMSException; public abstract long getJMSExpiration() throws JMSException; public abstract void setJMSExpiration(long l)//一个message对象的有效期,在发送者上,可通过setTimeToLive(long l)设置该发送者发送的所有消息的时效,为0表示永不过期 throws JMSException; public abstract int getJMSPriority() throws JMSException; public abstract void setJMSPriority(int i)//0-4普通优先级,5-9加急优先级,生产者可使用setPriority()方法声明 throws JMSException;
}
消息属性:开发者可以自定义能满足他们需要的所有属性
public abstract void clearProperties() throws JMSException; public abstract boolean propertyExists(String s) throws JMSException; public abstract boolean getBooleanProperty(String s) throws JMSException; public abstract byte getByteProperty(String s) throws JMSException; public abstract short getShortProperty(String s) throws JMSException; public abstract int getIntProperty(String s) throws JMSException; public abstract long getLongProperty(String s) throws JMSException; public abstract float getFloatProperty(String s) throws JMSException; public abstract double getDoubleProperty(String s) throws JMSException; public abstract String getStringProperty(String s) throws JMSException; public abstract Object getObjectProperty(String s) throws JMSException; public abstract Enumeration getPropertyNames() throws JMSException; public abstract void setBooleanProperty(String s, boolean flag) throws JMSException; public abstract void setByteProperty(String s, byte byte0) throws JMSException; public abstract void setShortProperty(String s, short word0) throws JMSException; public abstract void setIntProperty(String s, int i) throws JMSException; public abstract void setLongProperty(String s, long l) throws JMSException; public abstract void setFloatProperty(String s, float f) throws JMSException; public abstract void setDoubleProperty(String s, double d) throws JMSException; public abstract void setStringProperty(String s, String s1) throws JMSException; public abstract void setObjectProperty(String s, Object obj) throws JMSException; public abstract void acknowledge() throws JMSException; public abstract void clearBody() throws JMSException;
消息类型:
TextMessage,ObjectMessage,BytesMsssage,StreamMessage,MapMessage