18、消息驱动与Spring JMS的应用与实践

消息驱动与Spring JMS的应用与实践

1. 消息驱动Bean的应用场景

1.1 贷款请求处理示例

在贷款请求处理的场景中，消息驱动Bean可以作为消息门面，将核心业务逻辑与JMS基础设施和连接逻辑分离。以下是处理贷款请求的代码示例：

public void onMessage(Message message) {
    try{
       // Get the data from the message
       MapMessage msg = (MapMessage)message;
       double salary = msg.getDouble("Salary");
       double loanAmt = msg.getDouble("LoanAmount");

       // Determine whether to accept or decline the loan
       Lender lender = new Lender();
       boolean accepted = lender.analyzeLoadRequest(salary, loanAmt);
       // Send the results back to the borrower
       TextMessage tmsg = qSession.createTextMessage();
       tmsg.setText(accepted ? "Accepted!" : "Declined");
       tmsg.setJMSCorrelationID(messa