encodingfilter.java

数据字典 TAG标签 用于支持数据对照 支持各种radio check list显示

package com.beiktech.util;

import java.io.IOException ;
import javax.servlet.Filter ;
import javax.servlet.FilterChain ;
import javax.servlet.FilterConfig ;
import javax.servlet.ServletException ;
import javax.servlet.ServletRequest ;
import javax.servlet.ServletResponse ;


public class EncodingFilter
    implements Filter
{
    /**
     * 默认的字符集
     */
    protected String encoding = null ;

    /**
     ×FilterServlet指定的配置，如果这个为空则标记着这个Filter还没有配置
     */
    protected FilterConfig filterConfig = null ;

    /**
     * 客户端指定的字符集是否要求被忽略
     */
    protected boolean ignore = true ;

    /**
     * 回收垃圾，同时本Filter不再起作用
     */
    public void destroy ()
    {
        this.encoding = null ;
        this.filterConfig = null ;
    }


    /**
     * 改变Reqeust中的字符集
     *
     *
     * @param request   正在处理的servlet Request
     * @param response  处理后的response
     * @param chain     正在处理的Filter连
     *
     * @exception IOException if an input/output error occurs
     * @exception ServletException if a servlet error occurs
     */
    public void doFilter (
        ServletRequest request ,
        ServletResponse response ,
        FilterChain chain )
        throws
        IOException ,
        ServletException
    {
        if ( ignore || ( request.getCharacterEncoding () == null ) )
        {
            //request.setCharacterEncoding ( selectEncoding ( request ) ) ;
            request.setCharacterEncoding("utf-8");
            //System.out.println("request has been set to GBK123");
        }
        chain.doFilter ( request , response ) ;
    }


    /*******************************************************
     * 初始化过滤器服务.
     * @param   filterConfig The filter configuration object
     * @throws  ServletException 如果遇到异常
     * @author  chenbingc
     * @version 1.0
     * @since   1.0
     ********************************************************/
    public void init ( FilterConfig filterConfig )
        throws ServletException
    {

        this.filterConfig = filterConfig ;
        this.encoding = filterConfig.getInitParameter ( "encoding" ) ;
        String value = filterConfig.getInitParameter ( "ignore" ) ;
        if ( value == null )
            this.ignore = true ;
        else if ( value.equalsIgnoreCase ( "true" )
                  || value.equalsIgnoreCase ( "yes" ) )
            this.ignore = true ;
        else
            this.ignore = false ;
    }


    /***************************************************
     * selectEncoding
     * 从web.xml中取出配置字符集的信息
     * @param  request 正在处理的Request
     * @return 返回配置文件中设定的字符集
     ***************************************************/
    protected String selectEncoding ( ServletRequest request )
    {
        return ( this.encoding ) ;
    }


    /**
     * Returns the filterConfig.
     * @return FilterConfig
     */
    public FilterConfig getFilterConfig ()
    {
        return filterConfig ;
    }


    /**
     * Sets the filterConfig.
     * @param filterConfig The filterConfig to set
     */
    public void setFilterConfig ( FilterConfig filterConfig )
    {
        this.filterConfig = filterConfig ;
    }

}