How to call java method in jsp

JSP calls java method: first introduce the package where the Java method is located in the JSP page; then write [<%int result="Dy.Sub(5,4"><% in the page =result>] and save and run.

is actually very simple, because Java programs can be written directly in jsp. So the method of calling Java only needs a little change.

Recommended course: Java Tutorial.

Let’s take a look at an example:

Method written in JAVA

package doc;                         //定义一个包
public class Dy {                    //定义一个类     
 public static int Sub(int x,int y){  //定义函数Sub（）为静态函数
     return x-y;
 }
}

JSP page to call
First introduce the class to be used

<%@ page import="doc.*"%>            //引入所需要的函数所在的包，如果没有导入使用包，系统则认为所引用的类与当前类在同一个包中

Then Write the code in :

<% 
int a=5;
int b=4;
int result=0; 
%>
<%
result=Dy.Sub(a, b);                     //调用定义的方法
System.out.println(result);
%>
<%=result %>

Run the JSP page
Enter http://localhost:8080 in the browser address bar /Test/index.jsp

The page displays the results

1

Function call successful!

PS: Function calling method: class name. function name ()

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