How to reference java functions in jsp

First create a new project and add a package under the src folder: such as: cn.tianaoweb.com;

## Then add a package to the package Class: For example,

package com;
public class test {
    public String sd(){
        return "sd";
    }
}

is introduced at the beginning of the default homepage index.jsp (of course you can also create a new jsp file yourself).

<%@ page import="cn.tianaoweb.com.*"%>

Add the corresponding java code piece in :

<%
  String str;
  test te=new test();%> 
<%=te.sd()%>

In this way, the Java function is successfully referenced. Go to the JSP page.

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