用java中的过滤器写两个filter一个写请求，一个写响应字符串乱码处理

可以使用Java中的Filter接口来实现过滤器，具体代码如下：

请求过滤器：

public class RequestFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        HttpServletRequest req = (HttpServletRequest) request;
        req.setCharacterEncoding("UTF-8");
        chain.doFilter(request, response);
    }

    @Override
    public void destroy() {
    }
}

响应过滤器：

public class ResponseFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        HttpServletResponse resp = (HttpServletResponse) response;
        resp.setCharacterEncoding("UTF-8");
        chain.doFilter(request, response);
    }

    @Override
    public void destroy() {
    }
}

在web.xml中配置过滤器：

<filter>
    <filter-name>RequestFilter</filter-name>
    <filter-class>com.example.RequestFilter</filter-class>
</filter>
<filter-mapping>
    <filter-name>RequestFilter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>

<filter>
    <filter-name>ResponseFilter</filter-name>
    <filter-class>com.example.ResponseFilter</filter-class>
</filter>
<filter-mapping>
    <filter-name>ResponseFilter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>

这样就可以实现请求和响应字符串的乱码处理了。

关于lua closure factory的完整代码和中文加密的问题，我可以回答，但是需要您提供更具体的问题和需求。