java代码生成二维码一般步骤 常用的是Google的Zxing来生成二维码,生成的一般步骤如下: 一.下载zxing-core的jar包: 二.需要创建一个MatrixToImageWriter类,此类google的源码中提供了,为了使用方便,下面是类中的代码,可以直接复制来使用: private static final int BLACK = 0xFF000000; private static final int WHITE = 0xFFFFFFFF; private MatrixToI
去官方网站下载Jar包: http://simplecaptcha.sourceforge.net/ Javadocs: http://simplecaptcha.sourceforge.net/javadocs/index.html 自己书写工具类: /* * To change this license header, choose License Headers in Project Properties. * To change this template file, choose
http://www.javacodegeeks.com/2014/07/java-keystore-tutorial.html Table Of Contents 1. Introduction 2. SSL and how it works 3. Private Keys 4. Public Certificates 5. Root Certificates 6. Certificate Authorities 7. Certificate Chain 8. Keystore using J