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JavaWeb ???????????

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????JavaWeb????????????????????????????????????????????????????????????????????????????????????????

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@WebFilter("/*")public class CharacterFilter implements Filter {    @Override    public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {        HttpServletRequest request = (HttpServletRequest) req;        HttpServletResponse response = (HttpServletResponse) res;                if (request.getMethod().equalsIgnoreCase("post")) {            request.setCharacterEncoding("utf-8");        }        response.setContentType("text/html;charset=utf-8");                chain.doFilter(request, response);    }}

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@WebFilter("/*")public class SensitiveWordsFilter implements Filter {    private List
   
     sensitiveWords = new ArrayList<>();    @Override    public void init(FilterConfig config) throws ServletException {        try {            ServletContext servletContext = config.getServletContext();            String path = servletContext.getRealPath("/WEB-INF/classes/sensitiveWords.txt");                        BufferedReader br = new BufferedReader(new FileReader(path));            while ((line = br.readLine()) != null) {                sensitiveWords.add(line);            }            br.close();        } catch (Exception e) {            e.printStackTrace();        }    }    @Override    public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) throws ServletException, IOException {        ServletRequest proxyRequest = new Proxy(req) {            @Override            public String getParameter() {                String value = super.getParameter();                if (value != null) {                    for (String word : sensitiveWords) {                        if (value.contains(word)) {                            value = value.replaceAll(word, "***");                        }                    }                }                return value;            }        };        chain.doFilter(proxyRequest, resp);    }}
   

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????JavaWeb???????????Web????????????????????Servlet??8?????????????????

??????ServletContextListener

@WebListenerpublic class ContextLoaderListener implements ServletContextListener {    @Override    public void contextInitialized(ServletContextEvent event) {        ServletContext servletContext = event.getServletContext();        String contextConfigLocation = servletContext.getInitParameter("contextConfigLocation");        String realPath = servletContext.getRealPath(contextConfigLocation);        try {            FileInputStream fis = new FileInputStream(realPath);            System.out.println("ServletContext????????????" + realPath);        } catch (IOException e) {            e.printStackTrace();        }    }    @Override    public void contextDestroyed(ServletContextEvent event) {        System.out.println("ServletContext??????");    }}

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• ServletContextListener?????????????????
• SessionListener?????????????????????????
• RequestListener??????????????????????????????

????????????????????JavaWeb???????????????

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