web.xml内代码：
<!-- 字符集过滤器 -->
<filter>
<filter-name>CharacterEncodingFilter</filter-name>
<filter-class><span style="color:#ff0000;">org.springframework.web.filter.CharacterEncodingFilter</span></filter-class>
<init-param>
<param-name><span style="color:#ff0000;">encoding</span></param-name>
<param-value>UTF-8</param-value>
</init-param>
<init-param>
<param-name><span style="color:#ff0000;">forceEncoding</span></param-name>
<param-value>true</param-value>
</init-param>
</filter><filter-mapping> <filter-name>CharacterEncodingFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping>
org.springframework.web.filter.CharacterEncodingFilter源码：
<span style="font-family: Arial, Helvetica, sans-serif;">package org.springframework.web.filter;</span>
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 <span style="color:#ff0000;">encoding</span>;
private boolean <span style="color:#ff0000;">forceEncoding </span>= 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 (<span style="color:#ff0000;">this.encoding</span> != null && (<span style="color:#ff0000;">this.forceEncoding</span> || request.getCharacterEncoding() == null)) {
<span style="color:#ff0000;">request.setCharacterEncoding(this.encoding);</span>
if (this.forceEncoding) {
<span style="color:#ff0000;">response.setCharacterEncoding(this.encoding);</span>
}
}
filterChain.doFilter(request, response);
}
}
原文地址：http://blog.csdn.net/believejava/article/details/41805583
