例：將 “壞蛋”? “笨蛋”，變為“***”。

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1、敏感詞匯

// words.txt 壞蛋 笨蛋

2、首先創建filter

public class FilterDemo implements Filter {@Overridepublic void destroy() {}@Overridepublic void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain)throws IOException, ServletException {req.setCharacterEncoding("utf-8");resp.setContentType("text/html;charset=utf-8");// 通過動態代理 來增強 getParameter 方法ServletRequest obj = (ServletRequest) Proxy.newProxyInstance(req.getClass().getClassLoader(),req.getClass().getInterfaces(), new InvocationHandler() {@Overridepublic Object invoke(Object proxy, Method method, Object[] args) throws Throwable {// 如果執行getParameter方法if (method.getName().equals("getParameter")) {// 獲取該方法返回的 參數String values = (String) method.invoke(req, args);if (values != null) {for (String str : list) {// 如果遇到敏感詞匯，就將其替代為 ***if (values.contains(str)) {values = values.replaceAll(str, "***");}}}// 增強返回值return values;} else {return method.invoke(req, args);}}});obj.setCharacterEncoding("utf-8");// 放行chain.doFilter(obj, resp);}private List<String> list = new ArrayList<String>();@Overridepublic void init(FilterConfig config) throws ServletException {// 加載敏感詞匯到list集合ServletContext context = config.getServletContext();String path = context.getRealPath("\\WEB-INF\\words.txt");System.out.println(path);try {BufferedReader br = new BufferedReader(new FileReader(path));String line = "";while ((line = br.readLine()) != null) {list.add(line);}System.out.println(list);} catch (IOException e) {e.printStackTrace();}}}

3、創建servlet 并測試

@WebServlet("/sd") public class ServletDemo extends HttpServlet {@Overrideprotected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {req.setCharacterEncoding("utf-8");resp.setContentType("text/html;charset=utf-8");String name = req.getParameter("name");String msg = req.getParameter("msg");System.out.println("servlet : "+name + "：" + msg);}}

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總結

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