How to call Java class in Jsp

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Hi i am trying to call regular java class in jsp page and want to print some on jsp page when i am trying to do i am not getting any output

Here is my code

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3条回答

轮回少年

2021-01-04 14:29
The JSP useBean declaration is not needed in your code.

Just use
```
<body>
<%
  MyClass tc = new MyClass();
  tc.testMethod();
%>
</body>
```
But that WILL NOT print anything on the JSP. It will just print Hello on the server's console. To print Hello on the JSP, you have to return a String from your helper java class MyClass and then use the JSP output stream to display it.

Something like this:

In java Class
```
public String testMethod(){
    return "Hello";
}
```
And then in JSP
```
out.print(tc.testMethod());
```
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孤街浪徒

2021-01-04 14:40
Just to complete all the opportunities, You could also use the <%= opertator like:
```
<%
 MyClass tc = new MyClass ();
%>


<h1><%= tc.testMethod();  %> </h1>
```
and just for resume, the key points:
1. include class with <%@ page import tag
2. use the class as usual in .java behaviour
3. print data with out.print, <%= or jstl out tag
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忘了有多久

2021-01-04 14:42
Hi use your class name properly
```
<%
 MyClass tc = new MyClass ();
        tc.testMethod();

  %>
```
instead of
```
<%
 testClass tc = new testClass();
        tc.testMethod();

  %>
```
also when you use jsp:useBean, it creates a new object with the name as id inside your jsp converted servlet.

so use that id itself to call a method instead of creating new object again
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