使用动态代理对象进行敏感字过滤

package com.hopetesting.web.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;

/** * @author newcityman * @date 2019/9/13 - 19:41 */@WebFilter("/*")public class SensitiveWordsFilter implements Filter {    public void destroy() {    }

    public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) throws ServletException, IOException {        //1、创建代理对象，增强getParameter方法        ServletRequest proxy_req = (ServletRequest) Proxy.newProxyInstance(req.getClass().getClassLoader(), req.getClass().getInterfaces(), new InvocationHandler() {            @Override            public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {                //判断是否是getParameter方法                //如果是，增强getParameter方法                if (method.getName().equals("getParameter")) {                    //增强返回值                    //获取返回值                    String value = (String) method.invoke(req, args);                    if (value != null) {                        for (String str : list) {                            if (value.contains(str)) {                                value = value.replace(str, "******");                            }                        }                    }                    return value;                }                return method.invoke(req, args);            }        });        chain.doFilter(proxy_req, resp);    }

    private List<String> list = new ArrayList<String>(); //敏感词汇集合

    public void init(FilterConfig config) throws ServletException {        try {            //1、获取文件的真实路径            ServletContext servletContext = config.getServletContext();            String realPath = servletContext.getRealPath("/WEB-INF/classes/敏感词汇.txt");            //2、读取文件            BufferedReader br = new BufferedReader(new FileReader(realPath));            //3、将文件的每一行读取到list中            String line = null;            while ((line = br.readLine()) != null) {                list.add(line);            }            br.close();            System.out.println(list);        } catch (FileNotFoundException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        }    }

}

原文地址：https://www.cnblogs.com/newcityboy/p/11517618.html