如何将数据从 Java 类传递到 JSP 页面

Question

I am a newbie in JSP and Dynamic web projects. My project structure is shown as below. Basically, I am having a variable temperature in my SparkStreaming class which is generated in every 2 seconds and I wish to pass this value to the A.JSP page . I shall be generating few charts based on the JSP page.

How can I achieve this in Java?

Answer 1

Simply you can use sessions.

think in java class you have string variable call temperature .

string temperature = "11.11";
request.removeAttribute("temp");
request.setAttribute("temp", temperature);

in removeAttribute you clear the session stored value.then you set value to session.

In JSP u can access session value like this.

request.getAttribute("temp");

• If you want to pass two dimensional array you can convert the session and pass the value to session

Answer 2

您应该有一个 servlet，然后在 jsp 中调用该 servlet 以获取最新的温度值。