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温州知名网站推广,站长工具网站,1688是b2b吗,wordpress查看ftp服务器一、需求：敏感词汇过滤二、技术点：过滤器（Filter），代理增强（Proxy） 三、代码： 1、测试工程目录 2、src下创建敏感词文件敏感词.txt 3、新建敏感词过滤器 SensitiveWordsFilter.…

一、需求：敏感词汇过滤
二、技术点：过滤器（Filter），代理增强（Proxy）
三、代码：
1、测试工程目录
在这里插入图片描述
2、src下创建敏感词文件敏感词.txt

3、新建敏感词过滤器 SensitiveWordsFilter.java

package com.mollen.filter;
package com.mollen.filter.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;/*** @ClassName:  SensitiveWordsFilter* @Auther:     Mollen* @CreateTime: 2018-10-09  21:04:35* @Description:*              敏感词过滤*/
@WebFilter("/testServlet")
public class SensitiveWordsFilter implements Filter {// 1.创建敏感词汇集合private List<String> list = new ArrayList<>();// 2.加载敏感词汇文件@Overridepublic void init(FilterConfig filterConfig) throws ServletException {try {//ServletContext是servlet全局对象ServletContext servletContext = filterConfig.getServletContext();String path = servletContext.getRealPath("/WEB-INF/classes/敏感词.txt");BufferedReader br = new BufferedReader(new FileReader(path));String line = null;while ((line = br.readLine()) != null) {list.add(line);}br.close();System.out.println(list);} catch (Exception e) {e.printStackTrace();}}//3.创建代理对象，增强getParameter方法@Overridepublic void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {ServletRequest proxy_request = (ServletRequest) Proxy.newProxyInstance(servletRequest.getClass().getClassLoader(), servletRequest.getClass().getInterfaces(), new InvocationHandler() {@Overridepublic Object invoke(Object proxy, Method method, Object[] args) throws Throwable {//判断是否是getParameter方法if (method.getName().equals("getParameter")) {//增强返回值，获取返回值String value = (String) method.invoke(servletRequest, args);if (value != null) {for (String str : list) {if (value.contains(str)) {value = value.replaceAll(str, "***");}}}return value;}return method.invoke(servletRequest, args);}});//过滤器放行filterChain.doFilter(proxy_request, servletResponse);}@Overridepublic void destroy() {}
}

4、新建测试 TestServlet.java

package com.mollen.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 {this.doGet(request, response);}protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {//1.乱码处理request.setCharacterEncoding("utf-8");response.setContentType("text/html;charset=utf-8");//2.获取前台数据String id = request.getParameter("id");//3.控制台打印一下System.out.println(id);//4.页面再打印一下response.getWriter().write("提交的数据是："+id);}
}