敏感字符过滤器（Filter）

一.敏感字符过滤成（*******）

1. 创建过滤器filter包新建CharFilter类

package filter;

import util.MyRequest01;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;
import java.util.Set;

@WebFilter(filterName = "CharFilter",urlPatterns = "/CharServlet")
public class CharFilter implements Filter {
    private Properties p = new Properties();
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        //初始化,读取文件,存放的；ist中
        InputStream stream=filterConfig.getServletContext().getResourceAsStream("/WEB-INF/text.txt");
        InputStreamReader is=null;
        BufferedReader reader=null;
        try {
            is=new InputStreamReader(stream,"utf-8");
            reader=new BufferedReader(is);
            String txt="";
            while ((txt=reader.readLine())!=null){
                list.add(txt);
                System.out.println(txt);
            }
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }finally {
            try {
                reader.close();
                is.close();
                stream.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest)servletRequest;
        request.setCharacterEncoding("utf-8");
        servletResponse.setCharacterEncoding("utf-8");
        servletResponse.setContentType("text/html;charset=utf-8");
        filterChain.doFilter(servletRequest,servletResponse);
    }

    @Override
    public void destroy() {
            System.out.println(filterName+"过滤器销毁");
    }
}

2. 创建工具包util新建MyRequest类

package util;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import java.util.ArrayList;
import java.util.List;

public class MyRequest extends HttpServletRequestWrapper {
    private HttpServletRequest httpServletRequest;
    private List list = new ArrayList<>();

    public MyRequest(HttpServletRequest request, List list) {
        super(request);
        httpServletRequest = request;
        this.list = list;
    }

    @Override
    public String getParameter(String name) {
        String txt = httpServletRequest.getParameter(name);
        //
        if(txt!=null&&!txt.isEmpty()){
            for (int i=0;i 
新建txt文档，里面写上你要过滤的字符
 
text.txt里面包括
傻逼
sb
逗比
TMD
这些就是你要过滤的敏感字符
 
二·.敏感字符过滤成好听的文字
 1. 创建过滤器filter包新建CharFilter01类
 
package filter;

import util.MyRequest01;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;
import java.util.Set;

@WebFilter(filterName = "CharFilter",urlPatterns = "/CharServlet")
public class CharFilter implements Filter {
    private Properties p = new Properties();
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        InputStream stream=filterConfig.getServletContext().getResourceAsStream("/WEB-INF/char.properties");
        try {
            p.load(stream);
        } catch (IOException e) {
            e.printStackTrace();
        }
            Set