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Two Java replicas of SUSCTF2022 preface I didn't watch the game. First, I can't remember Java after touching the whole winter vacation... Second, because the hearts and minds of the team are directly seconds.. However, these two fastjson seem to have some strange problems. If you reproduce them, just learn something from them. baby gadget v ...

Arthas is a Java diagnostic tool open source by Alibaba in September 2018. It supports JDK6 + and adopts command-line interaction mode, which can easily locate and diagnose online program operation problems. The official document of Arthas is very detailed. See: https://alibaba.github.io/arthas Arthas usage scenario Thanks to the powerful ...

1, Read write separation concept Read write separation is to evenly distribute query requests to multiple data copies through master-slave configuration, so as to further improve the processing capacity of the system. Master-slave architecture: read-write separation, which aims at high availability and read-write expansion. The contents of t ...

background Are you still writing about explosions on the screen? That is, regardless of 3721, write all the code in one class, so the code is not elegant. If the change involves the old code, it may also affect the stability of the online system. In fact, in many cases, we can solve many potential system problems by skillfully using the desi ...

Preface: introduce a simple MyBatis encryption and decryption method. This method is rarely mentioned in daily study and work, so let's talk about it. If you already know this method, ignore this article 1, Background Sometimes in our database, some sensitive information of users, such as mobile phone number, bank card and other information, ...

shiro (java security framework) 1 Introduction Apache Shiro is a security framework for Java. At present, more and more people use Apache Shiro because it is quite simple. Compared with Spring Security, it may not be as powerful as Spring Security, but it may not need so complex things in actual work, so using a small and simple Shiro is enou ...

When we group the elements in the list, we can then aggregate the fields of the grouped elements to perform meaningful operations to help us analyze the data. Some examples are addition, average, or maximum / minimum. Aggregation of these individual fields can be easily done using Java Streams and Collectors. This document provides simple examp ...

Servlet 2: some other related problems of Servlet 1, Set code get request method Based on tomcat8, transcoding is not required To send Chinese data before tomcat8, the following transcoding operations are required String fname = req.getParameter("fname"); // 1. Break the string into byte arrays byte[] bytes = fname.getBytes("ISO-8859-1"); // ...

1, Introduction to blocking queue Queue is often used to solve production consumer problems. Queue interface and some general abstract methods are defined in Java public interface Queue<E> extends Collection<E> { // Adding an element returns true after adding successfully. If the queue is full, an exception will be thrown ...

Outline of this paper: Due to the large amount of content, this article will start directly from Chapter 5. For the complete version of the document, please click the link below: Nanny level tutorial of data warehouse construction PDF document The contents of the first four chapters are available at the link above Chapter V core of real-t ...