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這篇文章給大家分享的是有關(guān)Java中CharacterEncodingFilter過(guò)濾器怎么用的內(nèi)容。小編覺(jué)得挺實(shí)用的,因此分享給大家做個(gè)參考,一起跟隨小編過(guò)來(lái)看看吧。
在web項(xiàng)目中我們經(jīng)常會(huì)遇到當(dāng)前臺(tái)JSP頁(yè)面和JAVA代碼中使用了不同的字符集進(jìn)行編碼的時(shí)候就會(huì)出現(xiàn)表單提交的數(shù)據(jù)或者上傳/下載中文名稱文件出現(xiàn)亂碼的問(wèn)題,這些問(wèn)題的原因就是因?yàn)槲覀冺?xiàng)目中使用的編碼不一樣。為了解決這個(gè)問(wèn)題我們就可以使用CharacterEncodingFilter類,他是Spring框架對(duì)字符編碼的處理,基于函數(shù)回調(diào),對(duì)所有請(qǐng)求起作用,只在容器初始化時(shí)調(diào)用一次,依賴于servlet容器.具體配置如下:
<filter> <filter-name>characterEncodingFilter</filter-name> <!--配置轉(zhuǎn)碼,將編碼都轉(zhuǎn)為UTF-8--> <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class> <init-param> <param-name>encoding</param-name> <param-value>UTF-8</param-value> </init-param> <init-param> <param-name>forceEncoding</param-name> <param-value>true</param-value> </init-param> </filter> <filter-mapping> <filter-name>characterEncodingFilter</filter-name> <url-pattern>/*</url-pattern><!-- 攔截路徑--> </filter-mapping>
下面是Spring的源碼
/* * Copyright 2002-2007 the original author or authors. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package org.springframework.web.filter; import java.io.IOException; import javax.servlet.FilterChain; import javax.servlet.ServletException; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; /** * Servlet 2.3/2.4 Filter that allows one to specify a character encoding for * requests. This is useful because current browsers typically do not set a * character encoding even if specified in the HTML page or form. * * <p>This filter can either apply its encoding if the request does not * already specify an encoding, or enforce this filter's encoding in any case * ("forceEncoding"="true"). In the latter case, the encoding will also be * applied as default response encoding on Servlet 2.4+ containers (although * this will usually be overridden by a full content type set in the view). * * @author Juergen Hoeller * @since 15.03.2004 * @see #setEncoding * @see #setForceEncoding * @see javax.servlet.http.HttpServletRequest#setCharacterEncoding * @see javax.servlet.http.HttpServletResponse#setCharacterEncoding */ public class CharacterEncodingFilter extends OncePerRequestFilter { private String encoding; private boolean forceEncoding = false; /** * Set the encoding to use for requests. This encoding will be passed into a * {@link javax.servlet.http.HttpServletRequest#setCharacterEncoding} call. * <p>Whether this encoding will override existing request encodings * (and whether it will be applied as default response encoding as well) * depends on the {@link #setForceEncoding "forceEncoding"} flag. */ public void setEncoding(String encoding) { this.encoding = encoding; } /** * Set whether the configured {@link #setEncoding encoding} of this filter * is supposed to override existing request and response encodings. * <p>Default is "false", i.e. do not modify the encoding if * {@link javax.servlet.http.HttpServletRequest#getCharacterEncoding()} * returns a non-null value. Switch this to "true" to enforce the specified * encoding in any case, applying it as default response encoding as well. * <p>Note that the response encoding will only be set on Servlet 2.4+ * containers, since Servlet 2.3 did not provide a facility for setting * a default response encoding. */ public void setForceEncoding(boolean forceEncoding) { this.forceEncoding = forceEncoding; } @Override protected void doFilterInternal( HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) throws ServletException, IOException { if (this.encoding != null && (this.forceEncoding || request.getCharacterEncoding() == null)) { request.setCharacterEncoding(this.encoding); if (this.forceEncoding) { response.setCharacterEncoding(this.encoding); } } filterChain.doFilter(request, response); } }
從上面的配置和源碼我們可以發(fā)現(xiàn)
在配置字符集過(guò)濾器時(shí)可設(shè)定兩個(gè)參數(shù)的值,
1. encoding:字符集,即將過(guò)濾到的request的字符集設(shè)置為encoding指定的值,相當(dāng)于
request.setCharacterEncoding("")
2. forceEncoding:字面意思是強(qiáng)制字符集,這個(gè)參數(shù)的值是指定response的字符集是否也設(shè)置成encoding所指定的字符集,所以你可以選擇設(shè)置為true或false,當(dāng)值為true時(shí),相當(dāng)于
request.setCharacterEncoding(""); response.setCharacterEncoding("");
當(dāng)值為false時(shí),相當(dāng)于:
request.setCharacterEncoding("");
感謝各位的閱讀!關(guān)于“Java中CharacterEncodingFilter過(guò)濾器怎么用”這篇文章就分享到這里了,希望以上內(nèi)容可以對(duì)大家有一定的幫助,讓大家可以學(xué)到更多知識(shí),如果覺(jué)得文章不錯(cuò),可以把它分享出去讓更多的人看到吧!
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