struts中用过滤器（Filter）解决数据库中文的问题

在web.xml中加上

<filter>

<filter-name>Set Character Encoding</filter-name>

<filter-class>com.huahang.tj.struts.filters.SetCharacterEncodingFilter</filter-class>

<init-param>

<param-name>encoding</param-name>

<param-value>GB2312</param-value>

</init-param>

<init-param>

<param-name>ignore</param-name>

<param-value>true</param-value>

</init-param>

</filter>

<filter-mapping>

<filter-name>Set Character Encoding</filter-name>

<servlet-name>action</servlet-name>

</filter-mapping>

这里会涉及一个Filter,源码如下：

import javax.servlet.*;

import java.io.IOException;

.public class SetCharacterEncodingFilter implements Filter {

protected String encoding = null;

protected FilterConfig filterConfig = null;

protected boolean ignore = true;

public void destroy() {

this.encoding = null;

this.filterConfig = null;

}

public void doFilter(ServletRequest request, ServletResponse response,

FilterChain chain)

throws IOException, ServletException {

if (ignore || (request.getCharacterEncoding() == null)) {

String encoding = selectEncoding(request);

if (encoding != null)

request.setCharacterEncoding(encoding);

}

chain.doFilter(request, response);

}

public void init(FilterConfig filterConfig) throws ServletException {

this.filterConfig = filterConfig;

this.encoding = filterConfig.getInitParameter("encoding");

String value = filterConfig.getInitParameter("ignore");

if (value == null)

this.ignore = true;

else if (value.equalsIgnoreCase("true"))

this.ignore = true;

else if (value.equalsIgnoreCase("yes"))

this.ignore = true;

else

this.ignore = false;

}

protected String selectEncoding(ServletRequest request) {

return (this.encoding);

}

加上这个后，在action中就可以直接从form中接收gb2312编码的数据了，返回时自然也是gb2312了