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一個character encoding filter

package?cn.com.jsp;
?2

import?java.io.IOException;
?4

import?javax.servlet.Filter;
?5

import?javax.servlet.FilterChain;
?6

import?javax.servlet.FilterConfig;
?7

import?javax.servlet.ServletException;
?8

import?javax.servlet.ServletRequest;
?9

import?javax.servlet.ServletResponse;
10

import?javax.servlet.UnavailableException;
11

public ? class ?SetCharacterEncodingFilter?implements?Filter? {
13

???? protected ?String?encoding? = ? null ;
14

???? protected ?FilterConfig?filterConfig? = ? null ;
15

???? protected ?boolean?ignore? = ? true ;
16

???? public ? void ?destroy()? {
18

???????? this .encoding? = ? null ;
19

???????? this .filterConfig? = ? null ;
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????}
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???? public ? void ?doFilter(ServletRequest?request,?ServletResponse?response,
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?????????????????????????FilterChain?chain)?throws?IOException,
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????????????ServletException? {
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???????? // ?Conditionally?select?and?set?the?character?encoding?to?be?used
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???????? if ?(ignore? || ?(request.getCharacterEncoding()? == ? null ))? {
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????????????String?encoding? = ?selectEncoding(request);
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???????????? if ?(encoding? != ? null )? {
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????????????????request.setCharacterEncoding(encoding);
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????????????}
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????????}
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???????? // ?Pass?control?on?to?the?next?filter
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????????chain.doFilter(request,?response);
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????}
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???? public ? void ?init(FilterConfig?filterConfig)?throws?ServletException? {
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???????? this .filterConfig? = ?filterConfig;
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???????? this .encoding? = ?filterConfig.getInitParameter( " encoding " );
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????????String?value? = ?filterConfig.getInitParameter( " ignore " );
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???????? if ?(value? == ? null )? {
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???????????? this .ignore? = ? true ;
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????????} ? else ? if ?(value.equalsIgnoreCase( " true " ))? {
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???????????? this .ignore? = ? true ;
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????????} ? else ? if ?(value.equalsIgnoreCase( " yes " ))? {
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???????????? this .ignore? = ? true ;
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????????} ? else ? {
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???????????? this .ignore? = ? false ;
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????????}
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????}
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???? protected ?String?selectEncoding(ServletRequest?request)? {
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???????? return ?( this .encoding);
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????}
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}

相應的web.xml文件里的配置如下：

<web-app>
?2

??<display-name>wwwrootSPAN style="COLOR: #800000">display-name>
?3

??<description>MySQL?Test?AppSPAN style="COLOR: #800000">description>
?4

??<filter>
?5

????<filter-name>setCharacterEncodingFilterSPAN style="COLOR: #800000">filter-name>
?6

????<display-name>setCharacterEncodingFilterSPAN style="COLOR: #800000">display-name>
?7

????<description>setCharacterEncodingFilterSPAN style="COLOR: #800000">description>
?8

????<filter-class>cn.com.jsp.SetCharacterEncodingFilterSPAN style="COLOR: #800000">filter-class>
?9

????<init-param>
10

??????<param-name>encodingSPAN style="COLOR: #800000">param-name>
11

??????<param-value>GBKSPAN style="COLOR: #800000">param-value>
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????SPAN style="COLOR: #800000">init-param>
13

??SPAN style="COLOR: #800000">filter>
14

??<filter-mapping>
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????<filter-name>setCharacterEncodingFilterSPAN style="COLOR: #800000">filter-name>
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????<url-pattern>/*SPAN style="COLOR: #800000">url-pattern>
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??SPAN style="COLOR: #800000">filter-mapping>
18

……
19

SPAN style="COLOR: #800000">web-app>

上面的代碼我也沒更改什么，看了后，了解了其中的些許流程。放入blog，留以備學吧

posted on 2006-07-27 15:11 brock 閱讀(369) 評論(0) 編輯收藏

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