java中文过滤器

1.第一步：创建一个过滤器类:

package accp;

import java.io.IOException;

import java.util.Iterator;

import java.util.Map;

import java.util.Set;

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;

public class FileFilter implements Filter {

private FilterConfig filterConFig;

public FileFilter()

{

// TODO 自动生成构造函数存根

}

public void destroy()

{

// TODO 自动生成方法存根

}

public void doFilter(ServletRequest request, ServletResponse reponse, FilterChain chain) throws IOException, ServletException {

// TODO 自动生成方法存根

System.out.println("进入了过滤器!");

//1.最初步的过滤的方法

/* req.setCharacterEncoding("UTF-8");

chain.doFilter(req, rep);*/

//2.万能编码过滤器(我自认为的万能解码过滤器)

String encoding=filterConFig.getInitParameter("encoding");

try

{

System.out.println("通过了字符编码过滤器");

HttpServletRequest request1=(HttpServletRequest)request;

if(request1.getMethod().equalsIgnoreCase("post"))

{

System.out.println("通过了post请求过滤器");

request1.setCharacterEncoding(encoding);

}

else if(request1.getMethod().equalsIgnoreCase("get"))

{

System.out.println("通过了get请求过滤器");

Map map=request1.getParameterMap();

//Set 集合----这里的set起了一个中间过渡作用

Set set=map.keySet();

//迭代器

Iterator it=set.iterator();

while(it.hasNext()){

//键-值对

//通过迭代器的移动来获取参数中的键信息

String key=(String)it.next();

//通过key键来获取map类的对象中所存储的值

Object value=map.get(key);

//如果所取出的值为字符串数组

if(value instanceof String[]){

String[] values=(String[])value;

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

values[i]=new

String(values[i].getBytes("ISO-8859-1"),"utf-8");

}

}

}

}

chain.doFilter(request, reponse);

} catch (ServletException sx) {

filterConFig.getServletContext().log(sx.getMessage());

} catch (IOException iox) {

filterConFig.getServletContext().log(iox.getMessage()); }

}

public void init(FilterConfig arg0) throws ServletException {

// TODO 自动生成方法存根

this.filterConFig=arg0;

}

}

2.第二步：配置web.xml文件:

xmlns:xsi="https://www.360docs.net/doc/8f3037907.html,/2001/XMLSchema-instance" version="2.4" xsi:schemaLocation="https://www.360docs.net/doc/8f3037907.html,/xml/ns/j2ee http://java.sun .com/xml/ns/j2ee/web-app_2_4.xsd">

action

org.apache.struts.action.ActionServlet

config

/WEB-INF/struts-config.xml

debug

3

detail

3

0

action

*.do

Hello.jsp

myFilter

accp.FileFilter

encoding

UTF-8

myFilter

/*

3.第三步：应用过滤器

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