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  • Java code lib 反射查询类结构

    import java.lang.reflect.Constructor;
    import java.lang.reflect.Field;
    import java.lang.reflect.Method;
    import java.lang.reflect.Modifier;
    
    public class ReflectionDemo {
        public static void main(String[] args) {
            ReflectionDemo.paresClass("java.util.Date");
        }
    
    
        public static void paresClass(String className) {
    
            try {
                Class cl = Class.forName(className);
                cl.getComponentType();
                Class supercl = cl.getSuperclass();
                String modifiers = Modifier.toString(cl.getModifiers());
                if (modifiers.length() > 0) {
                    System.out.print(modifiers + " ");
                }
                System.out.print("class" + className);
                if (supercl != null && supercl != Object.class) {
                    System.out.print(" extends " + supercl.getName());
                }
                System.out.print("
    {
    ");
                printConstructor(cl);
                System.out.println();
                printMethods(cl);
                System.out.println();
                printFields(cl);
                System.out.println();
            } catch (Exception e) {
    
            }
        }
    
    
        private static void printFields(Class cl) {
            Field[] fields = cl.getDeclaredFields();
            for (Field f : fields) {
                Class type = f.getType();
                String name = type.getName();
                System.out.print(" ");
                String modifiers = Modifier.toString(f.getModifiers());
                if (modifiers.length() > 0) {
                    System.out.print(modifiers + " ");
                }
                System.out.println(type.getName() + " " + name + ";");
            }
        }
    
    
        private static void printMethods(Class cl) {
            Method[] methods = cl.getDeclaredMethods();
            for (Method m : methods) {
                Class retType = m.getReturnType();
                String name = m.getName();
    
                System.out.print(" ");
                String modifiers = Modifier.toString(m.getModifiers());
                if (modifiers.length() > 0) {
                    System.out.print(modifiers + " ");
                }
                System.out.print(retType.getName() + " " + name + "(");
                Class[] paramTypes = m.getParameterTypes();
                for (int j = 0; j < paramTypes.length; j++) {
                    if (j > 0) {
                        System.out.print(",");
                    }
                    System.out.print(paramTypes[j].getName());
                }
                System.out.println(");");
            }
        }
    
    
        private static void printConstructor(Class cl) {
            Constructor[] constructors = cl.getDeclaredConstructors();
            for (Constructor c : constructors) {
                String name = c.getName();
                System.out.print("  ");
                String modifiers = Modifier.toString(c.getModifiers());
                if (modifiers.length() > 0) {
                    System.out.print(modifiers + " ");
                }
                System.out.print(name + "(");
                Class[] paramTypes = c.getParameterTypes();
                for (int j = 0; j < paramTypes.length; j++) {
                    if (j > 0) {
                        System.out.print(",");
                    }
                    System.out.print(paramTypes[j].getName());
                }
                System.out.println(");");
            }
        }
    }
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  • 原文地址:https://www.cnblogs.com/lvjianwei/p/8335606.html
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