如何将变量从java传递到javascript？

<script>
    var message = '<%= message %>';
    // 在JavaScript中可以使用message变量
</script>

import org.mozilla.javascript.Context;
import org.mozilla.javascript.Scriptable;
import org.mozilla.javascript.ScriptableObject;

public class Main {
    public static void main(String[] args) {
        Context context = Context.enter();
        Scriptable scope = context.initStandardObjects();
        
        // 定义Java变量
        String message = "Hello from Java!";
        
        // 将Java变量传递给JavaScript
        ScriptableObject.putProperty(scope, "message", message);
        
        // 执行JavaScript代码
        String script = "alert(message);";
        context.evaluateString(scope, script, "JavaScript", 1, null);
        
        Context.exit();
    }
}

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class MyServlet extends HttpServlet {
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String message = "Hello from Java!";
        
        response.setContentType("text/plain");
        response.setCharacterEncoding("UTF-8");
        response.getWriter().write(message);
    }
}

fetch('/servlet-url')
    .then(response => response.text())
    .then(message => {
        // 在JavaScript中可以使用message变量
        console.log(message);
    });