暴力反射可以获取java类中私有的方法
儿子
package cn.itcast.travel.web.servlet;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
@WebServlet("/user/*")
public class UserServlet extends BaseServlet {
protected void add(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
System.out.println("userServlet add方法");
}
protected void find(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
System.out.println("userServlet find方法");
}
}
老爹
package cn.itcast.travel.web.servlet;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
public class BaseServlet extends HttpServlet {
@Override
protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
// 完成方法分发
// 获取请求路径
String uri = req.getRequestURI();// /travel/user/123
// 获取方法名称
String methodname = uri.substring(uri.lastIndexOf("/")+1);
System.out.println(methodname);
// 获取方法对象 反射相关的知识
try {
// getDeclaredMethod忽略访问权限修饰符
Method method = this.getClass().getDeclaredMethod(methodname,HttpServletRequest.class,HttpServletResponse.class);
//执行方发
// 暴力反射
method.setAccessible(true);
method.invoke(this,req,resp);
} catch (NoSuchMethodException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (InvocationTargetException e) {
e.printStackTrace();
}
}
}