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