Struts2中get请求中文乱码问题

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<!-- constant 配置 -->
<!-- 用于设置默认的本地编码 -->
<constant name="struts.i18n.encoding" value="UTF-8" />

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package com.gx.filter;
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;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class SetCharacterEncodingFilter implements Filter{
private String encoding="utf-8";
private boolean ignore=true;
@Override
public void init(FilterConfig filterConfig) throws ServletException {
String encoding= filterConfig.getInitParameter("encoding");
String ignore= filterConfig.getInitParameter("ignore");
if (encoding!=null && !"".equals(encoding)) {
this.encoding=encoding;
}
if (ignore!=null) {
try {
this.ignore=Boolean.valueOf(ignore);
} catch (Exception e) {
}
}
}
@Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse,
FilterChain chain) throws IOException, ServletException {
HttpServletRequest request = (HttpServletRequest) servletRequest;
HttpServletResponse response = (HttpServletResponse) servletResponse;
if (this.ignore && (request.getCharacterEncoding() == null)) {
if (encoding!=null) {
request.setCharacterEncoding(encoding);
response.setCharacterEncoding(encoding);
}
}
chain.doFilter(request, response);
}
@Override
public void destroy() {
encoding=null;
}
}

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<!-- 配置字符编码过滤器 -->
<filter>
<filter-name>SetCharacterEncodingFilter</filter-name>
<filter-class>com.gx.filter.SetCharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>utf-8</param-value>
</init-param>
<init-param>
<param-name>ignore</param-name>
<param-value>true</param-value>
</init-param>
</filter>

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<Connector port="8080" protocol="HTTP/1.1"
connectionTimeout="20000"
redirectPort="8443"
URIEncoding="UTF-8" />