java 过滤敏感词汇

package cn.itcast.web.filter;

import javax.servlet.*;
import javax.servlet.annotation.*;
import java.io.*;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.util.ArrayList;
import java.util.List;

@WebFilter(filterName = "SensitiveWordsFilter",value = "/*")
public class SensitiveWordsFilter implements Filter {

    private List<String> list = new ArrayList<String>();

    public void init(FilterConfig config) throws ServletException {
        // 加载文件
        // 获取文件真实路径
        try {
            ServletContext servletContext = config.getServletContext();
            String realPath = servletContext.getRealPath("/mgch.txt");
            // 读取文件
            // BufferedReader br = new BufferedReader(new FileReader(realPath));
            BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(realPath), "UTF-8"));
            String line = null;
            while ((line = br.readLine()) != null){
                list.add(line);
            }
            br.close();
            System.out.println(list);

        } catch (Exception e) {
            e.printStackTrace();
        } finally {
        }

        // 将每一行文件添加list
    }

    public void destroy() {
    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws ServletException, IOException {

        // 创建代理对象
        ServletRequest proxy_req = (ServletRequest)Proxy.newProxyInstance(request.getClass().getClassLoader(), request.getClass().getInterfaces(), new InvocationHandler() {
            @Override
            public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
                if(method.getName().equals("getParameter")){
                    // 增强返回值
                    String value = (String) method.invoke(request, args);

                    if(value != null){
                        for (String str:list){
                            if(value.contains(str)){
                                value = value.replaceAll(str,"***");
                            }
                        }

                        return value;
                    }

                }
                return method.invoke(request,args);
            }
        });


        chain.doFilter(proxy_req, response);
    }
}

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