Java Reflection Sample Code

If the Zamples security manager is configured to disable reflection then the following program fragments will not work. The default setting for the security manager does allow for reflection, so the following program fragments should work on most installations.

File Access

List All Methods of a class

out.println("<h3>" + getClass().getName() + " Methods</h3>");
Method[] methods = getClass().getDeclaredMethods();
for (int i=0; i<methods.length; i++) {
   Method m = methods[i];
   Class retType = m.getReturnType();
   Class[] paramTypes = m.getParameterTypes();
   String name = m.getName();
   out.print(Modifier.toString(m.getModifiers()));
   out.print(" " + retType.getName() + " " + name + "(");
   for (int j=0; j<paramTypes.length; j++) {
      if (j>0) out.print(", ");
      out.print(paramTypes[j].getName());
   }
   out.println(");");
}

Sample Output

Formatted for easier reading. Note that a JSP's class has a very long name!

sessions._0002fsessions_0002fl_00030x_00034syf_00031b_00031_0002ejspl0x4syf1b1_jsp_22
Methods public void _jspService(javax.servlet.http.HttpServletRequest,
    javax.servlet.http.HttpServletResponse);
public final void _jspx_init();

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