package com.struts3;
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;
public class setCharEncodingFilter implements Filter {
protected FilterConfig filterConfig;
public void init(FilterConfig filterConfig) throws ServletException {
this.filterConfig = filterConfig;
}
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) throws IOException, ServletException {
if (this.filterConfig.getInitParameter("enable").equals("true")) {
request.setCharacterEncoding(this.filterConfig.getInitParameter("encoding"));
response.setCharacterEncoding(this.filterConfig.getInitParameter("encoding"));
}
chain.doFilter(request, response);
System.out.println("do Filter!");
}
public void destroy() {
}
}
web.xml配置:
<filter>
<filter-name>setCharEncoding</filter-name>
<filter-class>com.struts3.setCharEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>utf-8</param-value>
</init-param>
<init-param>
<param-name>enable</param-name>
<param-value>true</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>setCharEncoding</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
可以通过web.xml进行Filter的encoding编码选择,以及是否使用该filter。
另外要注意jsp文件的pageEncoding如果和web.xml中的参数不一致会导致编码错误,所以建议jsp不指定pageEncoding。