Java反射通用类 获取所有成员变量 构造方法 成员方法

import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;

public class ReflectUtil {

	public static void main(String[] args) {
		try {
			String classNameString = "java.lang.Math";
			Class c = Class.forName(classNameString);

			reflectDeclaredFields(c);
			System.out.println("\n");
			reflectDeclaredConstructors(c);
			System.out.println("\n");
			reflectDeclaredMethods(c);

			reflectFields(c);
			System.out.println("\n");
			reflectConstructors(c);
			System.out.println("\n");
			reflectMethods(c);

		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	/**
	 * 反射所有变量
	 * 
	 * @param c
	 */
	public static void reflectDeclaredFields(Class c) {
		try {
			Field[] fields = c.getDeclaredFields();
			System.out.println("this class has " + fields.length + " field");
			for (Field field : fields) {
				System.out.println(Modifier.toString(field.getModifiers()) + " " + field.getType().getSimpleName() + " "
						+ field.getName());
				// System.out.println(field);
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	public static void reflectFields(Class c) {
		try {
			Field[] fields = c.getFields();
			System.out.println("this class has " + fields.length + " field");
			for (Field field : fields) {
				System.out.println(Modifier.toString(field.getModifiers()) + " " + field.getType().getSimpleName() + " "
						+ field.getName());
				// System.out.println(field);
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	/**
	 * 反射所有构造方法
	 * 
	 * @param c
	 */
	public static void reflectDeclaredConstructors(Class c) {
		try {
			Constructor[] constructors = c.getDeclaredConstructors();
			System.out.println("this class has " + constructors.length + " constructor");
			for (Constructor constructor : constructors) {
				StringBuilder sb = new StringBuilder(
						Modifier.toString(constructor.getModifiers()) + " " + constructor.getName() + "(");
				Class[] types = constructor.getParameterTypes();
				if (types.length > 0) {
					for (Class type : types) {
						sb.append(type.getSimpleName() + ",");
					}
					sb.deleteCharAt(sb.length() - 1);
				}
				sb.append(")");
				System.out.println(sb);
				// System.out.println(constructor);
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	public static void reflectConstructors(Class c) {
		try {
			Constructor[] constructors = c.getConstructors();
			System.out.println("this class has " + constructors.length + " constructor");
			for (Constructor constructor : constructors) {
				StringBuilder sb = new StringBuilder(
						Modifier.toString(constructor.getModifiers()) + " " + constructor.getName() + "(");
				Class[] types = constructor.getParameterTypes();
				if (types.length > 0) {
					for (Class type : types) {
						sb.append(type.getSimpleName() + ",");
					}
					sb.deleteCharAt(sb.length() - 1);
				}
				sb.append(")");
				System.out.println(sb);
				// System.out.println(constructor);
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	/**
	 * 反射所有成员方法
	 * 
	 * @param c
	 */
	public static void reflectDeclaredMethods(Class c) {
		try {
			Method[] methods = c.getDeclaredMethods();
			System.out.println("this class has " + methods.length + " method");
			for (Method method : methods) {
				StringBuilder sb = new StringBuilder(Modifier.toString(method.getModifiers()) + " "
						+ method.getReturnType().getSimpleName() + " " + method.getName() + "(");
				Class[] types = method.getParameterTypes();
				if (types.length > 0) {
					for (Class type : types) {
						sb.append(type.getSimpleName() + ",");
					}
					sb.deleteCharAt(sb.length() - 1);
				}
				sb.append(")");
				System.out.println(sb);
				// System.out.println(method);
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	public static void reflectMethods(Class c) {
		try {
			Method[] methods = c.getDeclaredMethods();
			System.out.println("this class has " + methods.length + " method");
			for (Method method : methods) {
				StringBuilder sb = new StringBuilder(Modifier.toString(method.getModifiers()) + " "
						+ method.getReturnType().getSimpleName() + " " + method.getName() + "(");
				Class[] types = method.getParameterTypes();
				if (types.length > 0) {
					for (Class type : types) {
						sb.append(type.getSimpleName() + ",");
					}
					sb.deleteCharAt(sb.length() - 1);
				}
				sb.append(")");
				System.out.println(sb);
				// System.out.println(method);
			}
		} catch (Exception e) {
			e.printStackTrace();
		}

	}

}