JavaWeb项目----使用拦截器拦截敏感词功能

1.jsp

<form action="index" method="post"> <textarea rows="4" cols="20" name="content"></textarea><span>${msg}</span><br/> <input type="submit" value="内容提交"/> </form>

2.servlet

package com.qst.filter; import java.io.IOException; import javax.servlet.Filter; import javax.servlet.FilterChain; import javax.servlet.FilterConfig; import javax.servlet.ServletException; import javax.servlet.ServletRequest; import javax.servlet.ServletResponse; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public class TestFilter implements Filter { public void destroy() { // TODO Auto-generated method stub } public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { HttpServletRequest req=(HttpServletRequest) request; HttpServletResponse res=(HttpServletResponse)response; String content= request.getParameter("content"); int pos=content.indexOf("fuck"); if(pos!=-1){ req.setAttribute("msg", "此段信息中含有敏感词"); request.getRequestDispatcher("login.jsp").forward(req, res); }else{ chain.doFilter(request, response); } } public void init(FilterConfig fConfig) throws ServletException { // TODO Auto-generated method stub } }