过滤输入的代码java java过滤器filter

java filter 过滤器中文乱码 怎么解决啊？

1、首先编写一个Java类的filter代码。操作步骤：

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(1)在myeclipse中新建一个java类，

(2)单击“Add”按钮，在弹出来的对话框中“选择接口”文本框中输入Filter，

并选择匹配好的类型javax.servlet

(3)单击“OK”按钮返回"New Java Class"对话，然后单击“Finish”按钮，就可以看到创建的过滤器框架:

过滤器类：Encoding.java,代码如下:

package com;

import java.io.IOException;

import javax.servlet.*;

public class Encoding implements Filter {

protected String encoding=null;

protected FilterConfig config;

public void destroy() {

// TODO Auto-generated method stub

}

public void doFilter(ServletRequest request, ServletResponse response,

FilterChain chain) throws IOException, ServletException {

if(request.getCharacterEncoding()==null){

//得倒指定的编码

String encode=getEncoding();

if(encode!=null){

//设置request的编码

request.setCharacterEncoding(encode);

response.setCharacterEncoding(encode);

}

}

chain.doFilter(request, response);

}

public void init(FilterConfig filterConfig) throws ServletException {

this.config=filterConfig; //得到web.xml中的配置编码

this.encoding=filterConfig.getInitParameter("Encoding");

}

protected String getEncoding(){

return encoding;

}

}

2、在web.xml文件写入以下代码：

?xml version="1.0" encoding="UTF-8"?

web-app version="2.5"

xmlns=""

xmlns:xsi=""

xsi:schemaLocation="

"

display-name/display-name

filter !-- 控制编码 --

filter-nameEncodingFilter/filter-name

filter-classcom.Encoding/filter-class

init-param !-- 初始化参数 --

param-nameEncoding/param-name

param-valueGB2312/param-value

/init-param

/filter

filter-mapping

filter-nameEncodingFilter/filter-name

url-pattern/*/url-pattern

/filter-mapping

/web-app

java过滤非法字符的filter

filter代码在pujia12345提供的代码上改的；

jsp页面的编码你设成你自己的，我用的是utf-8。

input.jsp输入后，正常跳转到handle.jsp，而禁词已经被过滤。

filter：

package test;

import java.io.*;

import javax.servlet.*;

import java.util.*;

public class MyFilter implements Filter

{

private ListString unString;

public void init(FilterConfig filterConfig) throws ServletException

{

unString = new ArrayListString();

unString.add("日");

}

public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)

throws IOException, ServletException

{

String content = request.getParameter("content");//需要过滤的参数

if(content!=null){

for (int i = 0; i unString.size(); i++)

{

String strIllegal = unString.get(i);

if (content.indexOf(strIllegal) = 0)

{

content = content.replaceAll(strIllegal, "");//非法字符替换成空

}

request.setAttribute("content", content);//为request设置属性保存修改后的值

}

}

chain.doFilter(request, response);

}

public void destroy()

{

//System.out.println("过滤器销毁");

}

}

//---------------------------//

web.xml:

filter

filter-namemyfilter/filter-name

filter-classtest.MyFilter/filter-class

/filter

filter-mapping

filter-namemyfilter/filter-name

url-pattern/*/url-pattern

/filter-mapping

//---------------------------//

输入页面input.jsp:

%@page contentType="text/html;charset=utf-8"%

!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" ""

html xmlns=""

head

titleinput.jsp/title

/head

body

form action="handle.jsp" method="post"

input type="text" name="content" /

input type="submit" value=" 提交 " /

/form

/body

/html

//---------------------------//

input提交的页面handle.jsp:

%@page contentType="text/html;charset=utf-8"%

!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" ""

html xmlns=""

head

title handle.jsp /title

/head

body

%

String content = (String)request.getAttribute("content");

out.println(content);

%

/body

/html

java中如何过滤html的代码

把需要写入数据库的字符通过下面的方法过滤然后再写入 public static String converthtml(String input) { if (input == null || input.length() == 0) { return input; } StringBuffer buf = new StringBuffer(input.length() + 6); char ch = ' '; for (int i = 0; i input.length(); i++) { ch = input.charAt(i); if (ch == '') { buf.append(""); } else if (ch == '') { buf.append(""); } else if (ch == '') { buf.append(""); } else if (ch == ' ') { buf.append(" "); } else { buf.append(ch); } } return buf.toString(); }

希望采纳