過濾類
??1
/**?*//**
??2
?*
??3?*
??4?*?apache?出的?struts?hibernate?字符編碼處理過濾器
??5?*
??6?*
??7
?*/
??8
package?com.zeroidea.common;
??9/**//*
?10*?Copyright?2004?The?Apache?Software?Foundation
?11*
?12*?Licensed?under?the?Apache?License,?Version?2.0?(the?"License");
?13*?you?may?naot?use?this?file?except?in?compliance?with?the?License.
?14*?You?may?obtain?a?copy?of?the?License?at
?15*
?16*?????http://www.apache.org/licenses/LICENSE-2.0
?17*
?18*?Unless?required?by?applicable?law?or?agreed?to?in?writing,?software
?19*?distributed?under?the?License?is?distributed?on?an?"AS?IS"?BASIS,
?20*?WITHOUT?WARRANTIES?OR?CONDITIONS?OF?ANY?KIND,?either?express?or?implied.
?21*?See?the?License?for?the?specific?language?governing?permissions?and
?22*?limitations?under?the?License.
?23*/
?24
?25import?java.io.IOException;
?26
?27import?javax.servlet.Filter;
?28import?javax.servlet.FilterChain;
?29import?javax.servlet.FilterConfig;
?30import?javax.servlet.ServletException;
?31import?javax.servlet.ServletRequest;
?32import?javax.servlet.ServletResponse;
?33
?34
?35/**?*//**
?36?*?<p>Example?filter?that?sets?the?character?encoding?to?be?used?in?parsing?the
?37?*?incoming?request,?either?unconditionally?or?only?if?the?client?did?not
?38?*?specify?a?character?encoding.??Configuration?of?this?filter?is?based?on
?39?*?the?following?initialization?parameters:</p>
?40?*?<ul>
?41?*?<li><strong>encoding</strong>?-?The?character?encoding?to?be?configured
?42?*?????for?this?request,?either?conditionally?or?unconditionally?based?on
?43?*?????the?<code>ignore</code>?initialization?parameter.??This?parameter
?44?*?????is?required,?so?there?is?no?default.</li>
?45?*?<li><strong>ignore</strong>?-?If?set?to?"true",?any?character?encoding
?46?*?????specified?by?the?client?is?ignored,?and?the?value?returned?by?the
?47?*?????<code>selectEncoding()</code>?method?is?set.??If?set?to?"false,
?48?*?????<code>selectEncoding()</code>?is?called?<strong>only</strong>?if?the
?49?*?????client?has?not?already?specified?an?encoding.??By?default,?this
?50?*?????parameter?is?set?to?"true".</li>
?51?*?</ul>
?52?*
?53?*?<p>Although?this?filter?can?be?used?unchanged,?it?is?also?easy?to
?54?*?subclass?it?and?make?the?<code>selectEncoding()</code>?method?more
?55?*?intelligent?about?what?encoding?to?choose,?based?on?characteristics?of
?56?*?the?incoming?request?(such?as?the?values?of?the?<code>Accept-Language</code>
?57?*?and?<code>User-Agent</code>?headers,?or?a?value?stashed?in?the?current
?58?*?user's?session.</p>
?59?*
?60?*?@author?Craig?McClanahan
?61?*?@version?$Revision:?1.2?$?$Date:?2004/03/18?16:40:28?$
?62?*/
?63
?64public?class?SetCharacterEncodingFilter?implements?Filter?
{
?65
?66
?67????//?-----------------------------------------------------?Instance?Variables
?68
?69
?70
????/**?*//**
?71?????*?The?default?character?encoding?to?set?for?requests?that?pass?through
?72?????*?this?filter.
?73
?????*/
?74????protected?String?encoding?=?null;
?75
?76????/**?*//**
?77?????*?The?filter?configuration?object?we?are?associated?with.??If?this?value
?78?????*?is?null,?this?filter?instance?is?not?currently?configured.
?79?????*?
?80?????*?@uml.property?name="filterConfig"
?81?????*?@uml.associationEnd?multiplicity="(0?1)"
?82?????*/
?83????protected?FilterConfig?filterConfig?=?null;
?84
?85
?86
?87????/**?*//**
?88?????*?Should?a?character?encoding?specified?by?the?client?be?ignored?
?89?????*/
?90????protected?boolean?ignore?=?true;
?91
?92
?93????//?---------------------------------------------------------?Public?Methods
?94
?95
?96????/**?*//**
?97?????*?Take?this?filter?out?of?service.
?98?????*/
?99????public?void?destroy()?{
100
101????????this.encoding?=?null;
102????????this.filterConfig?=?null;
103
104????}
105
106
107????/**?*//**
108?????*?Select?and?set?(if?specified)?the?character?encoding?to?be?used?to
109?????*?interpret?request?parameters?for?this?request.
110?????*
111?????*?@param?request?The?servlet?request?we?are?processing
112?????*?@param?result?The?servlet?response?we?are?creating
113?????*?@param?chain?The?filter?chain?we?are?processing
114?????*
115?????*?@exception?IOException?if?an?input/output?error?occurs
116?????*?@exception?ServletException?if?a?servlet?error?occurs
117?????*/
118????public?void?doFilter(ServletRequest?request,?ServletResponse?response,
119?????????????????????????FilterChain?chain)
120????throws?IOException,?ServletException?{
121
122????????//?Conditionally?select?and?set?the?character?encoding?to?be?used
123????????if?(ignore?||?(request.getCharacterEncoding()?==?null))?{
124????????????String?encoding?=?selectEncoding(request);
125????????????if?(encoding?!=?null)
126????????????????request.setCharacterEncoding(encoding);
127????????}
128
129????//?Pass?control?on?to?the?next?filter
130????????chain.doFilter(request,?response);
131
132????}
133
134????/**?*//**
135?????*?Place?this?filter?into?service.
136?????*?
137?????*?@param?filterConfig?The?filter?configuration?object
138?????*?
139?????*?@uml.property?name="filterConfig"
140?????*/
141????public?void?init(FilterConfig?filterConfig)?throws?ServletException?{
142
143????????this.filterConfig?=?filterConfig;
144????????this.encoding?=?filterConfig.getInitParameter("encoding");
145????????String?value?=?filterConfig.getInitParameter("ignore");
146????????if?(value?==?null)
147????????????this.ignore?=?true;
148????????else?if?(value.equalsIgnoreCase("true"))
149????????????this.ignore?=?true;
150????????else?if?(value.equalsIgnoreCase("yes"))
151????????????this.ignore?=?true;
152????????else
153????????????this.ignore?=?false;
154
155????}
156
157????//?------------------------------------------------------?Protected?Methods
158
159
160????/**?*//**
161?????*?Select?an?appropriate?character?encoding?to?be?used,?based?on?the
162?????*?characteristics?of?the?current?request?and/or?filter?initialization
163?????*?parameters.??If?no?character?encoding?should?be?set,?return
164?????*?<code>null</code>.
165?????*?<p>
166?????*?The?default?implementation?unconditionally?returns?the?value?configured
167?????*?by?the?<strong>encoding</strong>?initialization?parameter?for?this
168?????*?filter.
169?????*
170?????*?@param?request?The?servlet?request?we?are?processing
171?????*/
172????protected?String?selectEncoding(ServletRequest?request)?{
173
174????????return?(this.encoding);
175
176????}
177
178
179}
180 web.xml 中的設置
?1?<!--?編碼轉換過濾器??-->
?2?<filter>
?3??<filter-name>Encoding</filter-name>
?4??<filter-class>com.zeroidea.common.SetCharacterEncodingFilter</filter-class>
?5??<init-param>
?6???<param-name>encoding</param-name>
?7???<param-value>GBK</param-value>
?8??</init-param>
?9?</filter>
10?
11?<!--?映射過濾器-->
12?<filter-mapping>
13??<filter-name>Encoding</filter-name>
14??<url-pattern>*.jsp</url-pattern>
15?</filter-mapping>
16?<filter-mapping>
17??<filter-name>Encoding</filter-name>
18??<url-pattern>*.do</url-pattern>
19?</filter-mapping>
posted on 2006-11-30 16:32
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