「java过滤器特殊字符」java过滤非法字符

博主：adminadmin 2023-01-18 23:00:06 375

本篇文章给大家谈谈java过滤器特殊字符，以及java过滤非法字符对应的知识点，希望对各位有所帮助，不要忘了收藏本站喔。

本文目录一览：

java正则表达式过滤特殊字符

String regexp = "[^'\"%]*";

String string = "abc%";

System.out.println (string.matches (regexp));

jsp\java如何编写过滤器过滤特殊字符

package com.jingdu.common;

import java.io.IOException;

import java.io.PrintWriter;

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 IllegalCharacterFilter implements Filter {

private String[] characterParams = null;

private boolean OK=true;

public void init(FilterConfig config) throws ServletException {

// if(config.getInitParameter("characterParams").length()1)

// OK=false;

// else

// this.characterParams = config.getInitParameter("characterParams").split(",");

System.out.println("初始化");

}

@SuppressWarnings("unchecked")

public void doFilter(ServletRequest request, ServletResponse response,

FilterChain arg2) throws IOException, ServletException {

HttpServletRequest servletrequest = (HttpServletRequest) request;

HttpServletResponse servletresponse = (HttpServletResponse) response;

String param = "";

String paramValue = "";

//设置请求编码格式

servletresponse.setContentType("text/html");

servletresponse.setCharacterEncoding("UTF-8");

servletrequest.setCharacterEncoding("UTF-8");

java.util.Enumeration params = request.getParameterNames();

//循环读取参数

while (params.hasMoreElements()){

param = (String) params.nextElement(); //获取请求中的参数

String[] values = servletrequest.getParameterValues(param);//获得每个参数对应的值

for (int i = 0; i values.length; i++) {

paramValue = values[i];

//转换目标字符变成对象字符，可以多个。后期扩展特殊字符库用于管理

paramValue = paramValue.replaceAll("'","");

paramValue = paramValue.replaceAll("@","");

paramValue = paramValue.replaceAll("胡锦涛","***");

//这里还可以增加，如领导人 自动转义成****,可以从数据库中读取非法关键字。

values[i] = paramValue;

}

//把转义后的参数重新放回request中

request.setAttribute(param, paramValue);

}

//继续向下 执行请求，如果有其他过滤器则执行过滤器

arg2.doFilter(request, response);

}

public void destroy() {

// TODO Auto-generated method stub

}

}

jsp\java 如何编写过滤器过滤特殊字符？

package com.jingdu.common;\x0d\x0aimport java.io.IOException;\x0d\x0aimport java.io.PrintWriter;\x0d\x0aimport javax.servlet.Filter;\x0d\x0aimport javax.servlet.FilterChain;\x0d\x0aimport javax.servlet.FilterConfig;\x0d\x0aimport javax.servlet.ServletException;\x0d\x0aimport javax.servlet.ServletRequest;\x0d\x0aimport javax.servlet.ServletResponse;\x0d\x0aimport javax.servlet.http.HttpServletRequest;\x0d\x0aimport javax.servlet.http.HttpServletResponse;\x0d\x0a\x0d\x0apublic class IllegalCharacterFilter implements Filter {\x0d\x0a private String[] characterParams = null;\x0d\x0a private boolean OK=true;\x0d\x0a \x0d\x0a public void init(FilterConfig config) throws ServletException {\x0d\x0a \x0d\x0a// if(config.getInitParameter("characterParams").length()

回答于 2022-11-16

JAVA特殊字符过滤方法

public static String StringFilter(String str) throws PatternSyntaxException {

// 只允许字母和数字

// String regEx = "[^a-zA-Z0-9]";

// 清除掉所有特殊字符

String regEx="[`~!@#$%^*()+=|{}':;',\\[\\]./?~！@#￥%……*（）——+|{}【】‘；：”“’。，、？]";

Pattern p = Pattern.compile(regEx);

Matcher m = p.matcher(str);

return m.replaceAll("").trim();

}

java过滤器特殊字符的介绍就聊到这里吧，感谢你花时间阅读本站内容，更多关于java过滤非法字符、java过滤器特殊字符的信息别忘了在本站进行查找喔。

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