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Java Forum / General / January 2007To invoke a Java ".class" file from JSP
hi I have 2 files, a Java ".class" file and a JSP file I need to invoke the Java ".class" file from the JSP file. from the JSP file I have to pass command line arguments to the Java ".class" file ( by command line arguments i mean the String args[] of the "public static void main(string args[])" ). and i have to display the output of the Java ".class" file in a web page using JSP. can anybody help me out. hi, public static <T> void invokeMethodDynamically(Class klassType, Class<T> argumentsType, String methodName, Object object,T valueSentForMethod) throws SecurityException, IllegalArgumentException, NoSuchMethodException, IllegalAccessException, InvocationTargetException { Method method; method = klassType.getMethod(methodName, argumentsType); Object returnValue = method.invoke(object,valueSentForMethod); } you can do something like this. alternatively you can use <Object> o = Class.forName("class_name").newInstance(); then use o as per you needs hope this helps regards gaurav > hi, > [quoted text clipped - 17 lines] > <Object> o = Class.forName("class_name").newInstance(); > then use o as per you needs Reflection should be avoided unless you can't do without it. What is wrong with accessing the class directly, if he knows the class's name? E.g. if class is called MyThing: MyThing.main(new String[] {"arg1", "arg2", "etc"}); > hi, > [quoted text clipped - 17 lines] > <Object> o = Class.forName("class_name").newInstance(); > then use o as per you needs Reflection should be avoided unless you can't do without it. What is wrong with accessing the class directly, if he knows the class's name? E.g. if class is called MyThing: MyThing.main(new String[] {"arg1", "arg2", "etc"}); > hi > I have 2 files, a Java ".class" file and a JSP file [quoted text clipped - 7 lines] > > can anybody help me out. Should have asked already - why exactly do you want to do this? What is the end aim? > I have to pass command line arguments to the Java ".class" file > ( by command line arguments i mean the String args[] of the "public static void main(string args[])" ). You've answered your own question. Although this class has a method signature that _allows_ it to be used as a command line app, it's still just a plain old method that takes parameters. It doesn't _have_to_ be used as a command line app. Give it some parameters and you can call it quite happily from within JSP. > hi > I have 2 files, a Java ".class" file and a JSP file [quoted text clipped - 7 lines] > > can anybody help me out. Should have asked already - why exactly do you want to do this? What is the end aim? > hi > I have 2 files, a Java ".class" file and a JSP file [quoted text clipped - 7 lines] > > can anybody help me out. Should have asked already - why exactly do you want to do this? What is the end aim? Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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