java filter 過濾器中文亂碼 怎么解決啊？

1、首先編寫一個Java類的filter代碼。操作步驟：

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(1)在myeclipse中新建一個java類，

(2)單擊“Add”按鈕，在彈出來的對話框中“選擇接口”文本框中輸入Filter，

并選擇匹配好的類型javax.servlet

(3)單擊“OK”按鈕返回"New Java Class"對話，然后單擊“Finish”按鈕，就可以看到創(chuàng)建的過濾器框架:

過濾器類：Encoding.java,代碼如下:

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){

//得倒指定的編碼

String encode=getEncoding();

if(encode!=null){

//設(shè)置request的編碼

request.setCharacterEncoding(encode);

response.setCharacterEncoding(encode);

}

}

chain.doFilter(request, response);

}

public void init(FilterConfig filterConfig) throws ServletException {

this.config=filterConfig; //得到web.xml中的配置編碼

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

}

protected String getEncoding(){

return encoding;

}

}

2、在web.xml文件寫入以下代碼：

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

web-app version="2.5"

xmlns=""

xmlns:xsi=""

xsi:schemaLocation="

"

display-name/display-name

filter !-- 控制編碼 --

filter-nameEncodingFilter/filter-name

filter-classcom.Encoding/filter-class

init-param !-- 初始化參數(shù) --

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過濾非法字符的filter

filter代碼在pujia12345提供的代碼上改的；

jsp頁面的編碼你設(shè)成你自己的，我用的是utf-8。

input.jsp輸入后，正常跳轉(zhuǎn)到handle.jsp，而禁詞已經(jīng)被過濾。

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");//需要過濾的參數(shù)

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, "");//非法字符替換成空

}

request.setAttribute("content", content);//為request設(shè)置屬性保存修改后的值

}

}

chain.doFilter(request, response);

}

public void destroy()

{

//System.out.println("過濾器銷毀");

}

}

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

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

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

輸入頁面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提交的頁面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中如何過濾html的代碼

把需要寫入數(shù)據(jù)庫的字符通過下面的方法過濾然后再寫入 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(); }

希望采納