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Mybatis使用过程一、加载配置文件mybatis-config.xml，生成会话工厂SqlSessionFactoryInputStream resourceAsStream = Resources.getResourceAsStream("mybatis-config.xml");SqlSessionFactory build = new SqlSessionFactoryBuilder().build(resourceAsStream);<?xml version="1.0" enc

3.0servlet批量上传文件//这个注解很关键@MultipartConfigpublic class UploadServlet extends HttpServlet { @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { req.setCharacterEncod

servlet实现批量文件下载public class BatchDownloadServlet extends HttpServlet { @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { doPost(req,resp); } @Override prote

Servlet异常处理一、servlet抛出异常时，我们可以配置一个异常处理器(Servlet)来处理异常二、首先创建一个Servletpublic class ErrorHandler extends HttpServlet { protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { }}三、配置web.xml，首先配置E

ServletResponse设置字符编码一、使用注意事项 1.使用ServletResponse.getWriter()一定要在ServletResponse其他方法调用之后，这样可以避免一些问题二、ResponseFacade是ServletResponse的实现类 //getWriter(),usingWriter是一个标记，标记Writer是否被使用过，为true说明被使用过，所以我们调用时，标记就会为true ... usingWriter = true; //ServletR

Tomcat大致流程一、涉及到的关键类1.Bootstrap->Catalina->StandardServer->StandardService->StandardEngine,Connector->Http11NioProtocol->NioEndpoint->Acceptor,Poller二、初始化 bootstrap.init() 初始化所有的类加载器ClassLoader,以及通过反射构造一个Catalina三、bootstrap继续执行，