需求

對day17_case案例錄入的數據進行敏感詞匯過濾

敏感詞匯參考敏：感詞匯.txt

如果是敏感詞匯，替換為 ***

分析

對request對象進行增強。增強獲取參數相關方法

放行。傳遞代理對象

代碼：

package cn.luis.web.filter;import javax.servlet.*; import javax.servlet.annotation.WebFilter; import java.io.BufferedReader; import java.io.FileReader; import java.io.IOException; import java.lang.reflect.InvocationHandler; import java.lang.reflect.Method; import java.lang.reflect.Proxy; import java.util.ArrayList; import java.util.List;/*** 敏感詞匯過濾器*/ @WebFilter("/*") public class SensitiveWordsFilter implements Filter {public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) throws ServletException, IOException {//1.創建代理對象，增強getParameter方法ServletRequest proxy_req = (ServletRequest) Proxy.newProxyInstance(req.getClass().getClassLoader(), req.getClass().getInterfaces(), new InvocationHandler() {@Overridepublic Object invoke(Object proxy, Method method, Object[] args) throws Throwable {//增強getParameter方法//判斷是否是getParameter方法if(method.getName().equals("getParameter")){//增強返回值//獲取返回值String value = (String) method.invoke(req,args);if(value != null){for (String str : list) {if(value.contains(str)){value = value.replaceAll(str,"***");}}}return value;}//判斷方法名是否是 getParameterMap//判斷方法名是否是 getParameterValuereturn method.invoke(req,args);}});//2.放行chain.doFilter(proxy_req, resp);}private List<String> list = new ArrayList<String>();//敏感詞匯集合public void init(FilterConfig config) throws ServletException {try{//1.獲取文件真實路徑ServletContext servletContext = config.getServletContext();String realPath = servletContext.getRealPath("/WEB-INF/classes/敏感詞匯.txt");//2.讀取文件BufferedReader br = new BufferedReader(new FileReader(realPath));//3.將文件的每一行數據添加到list中String line = null;while((line = br.readLine())!=null){list.add(line);}br.close();System.out.println(list);}catch (Exception e){e.printStackTrace();}}public void destroy() {}}

TestServlet

package cn.luis.web.servlet;import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.IOException;@WebServlet("/testServlet") public class TestServlet extends HttpServlet {protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {String name = request.getParameter("name");String msg = request.getParameter("msg");System.out.println(name + ":" + msg);}protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {this.doPost(request, response);} }

敏感詞匯.txt**

笨蛋 壞蛋

結果：

訪問：http://localhost;8080/testServlet?name=zhangsan&msg=你個笨蛋

在控制臺會輸出：

張三：你個***

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