Java实现过滤敏感词汇
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Java实现过滤敏感词汇
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Java實現過濾敏感詞匯：
使用動態代理模式，增強返回值類型，替換敏感詞匯
代碼如下：
1、敏感詞匯過濾器
package com.it.filter;import javax.servlet.*; import javax.servlet.annotation.WebFilter; import java.io.BufferedReader; import java.io.FileNotFoundException; 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;/*** @簡單描述:敏感詞匯過濾器* @Author:* @Date: 2022年03月16日 19時42分39秒*/ @WebFilter("/*") public class SensitiveFilter 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//判斷是否有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 s : list) {if (value.contains(s)){value = value.replaceAll(s,"***");}}}return value;}return method.invoke(req, args);}});chain.doFilter(proxy_req, resp);}//敏感詞匯集合private List<String> list = new ArrayList<String>();public void init(FilterConfig config) throws ServletException {try {//1、加載文件,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 bufferedReader = new BufferedReader(new FileReader(realPath));//3、將文件中的每一行數據添加到list集合中String line = null ;while ((line = bufferedReader.readLine()) != null){list.add(line);}bufferedReader.close();System.out.println(list);} catch (FileNotFoundException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}}public void destroy() {} }2、測試所需servlet
package com.it.controller;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;/*** @簡單描述：測試所需servlet* @Author:* @Date: 2022年03月16日 20時03分21秒*/ @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");String info = name+":"+msg ;System.out.println(info);request.setAttribute("info",info);request.getRequestDispatcher("he.jsp").forward(request,response);}protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {this.doPost(request, response);} }3、所需的前端界面:he.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head><title>Title</title> </head> <body> <div class="alert alert-warning alert-dismissible" role="alert"><button type="button" class="close" data-dismiss="alert" ><span>×</span></button><strong>${info}</strong> </div> </body> </html>4、直接在地址欄輸入：
http://localhost:8080/userjdbc/testServlet?name=測試&msg=（你要輸入的敏感詞匯）5、運行結果如下：
前端界面顯示：
總結
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