中文轉碼Filter

在Struts中經常會碰到中文轉碼的問題，最簡單的辦法就是直接寫一個ServletFilter
代碼如下：
ChineseFilter.class


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.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class ChineseFilter extends HttpServlet implements Filter {

?private FilterConfig filterConfig;
???? //Handle the passed-in FilterConfig
???? public void init(FilterConfig filterConfig) throws ServletException {
???????? this.filterConfig = filterConfig;
???? }
???? //Process the request/response pair
???? public void doFilter(ServletRequest request, ServletResponse response,
????????????????????????? FilterChain filterChain) {
???????? try {
???????? ?
???????? ?String encoding=filterConfig.getInitParameter("encoding");//從WEB.xml配置文件中取出參數，這樣我們可以通過配置修改編碼格式．??????????????????
???????????? request.setCharacterEncoding(encoding);//設置請求的編碼格式
???????????? filterChain.doFilter(request, response);
???????? } catch (ServletException sx) {
???????????? filterConfig.getServletContext().log(sx.getMessage());
???????? } catch (IOException iox) {
???????????? filterConfig.getServletContext().log(iox.getMessage());
???????? }
???? }

???? //Clean up resources
???? public void destroy() {
???? }

??protected void doGet(HttpServletRequest arg0, HttpServletResponse arg1) throws ServletException, IOException {
???// TODO Auto-generated method stub
???super.doGet(arg0, arg1);??
??}

??protected void doPost(HttpServletRequest arg0, HttpServletResponse arg1) throws ServletException, IOException {
???// TODO Auto-generated method stub
???super.doPost(arg0, arg1);???
??}?
}

寫完過濾器剩下的就是配置Web.xml了

?<filter>
? <filter-name>ChineseFilter</filter-name>
? <filter-class>com.blog.filter.ChineseFilter</filter-class>
<init-param>
??? <param-name>encoding</param-name>
??? <param-value>GBK</param-value>　配置編碼格式，可以配置成你想要的編碼（GBK,bg-2312）
</init-param>
? </filter>
?? <filter-mapping>
??? <filter-name>ChineseFilter</filter-name>
??? <url-pattern>/*</url-pattern>
? </filter-mapping>

好了，簡單的Filter就完成了．當然也有現成的包，比如你用Struts+Spring的話，那Spring中就有現成的轉碼過濾器，我們只要在WEB．xml中配置一下就OK了．

＜filter＞
＜filter-name＞encodingFilter＜/filter-name＞
?＜filter-class＞org.springframework.web.filter.CharacterEncodingFilter＜/filter-class＞
?＜init-param＞
?＜param-name＞encoding＜/param-name＞
. ＜param-value＞GBK＜/param-value＞
?＜/init-param＞
?＜/filter＞
＜filter-mapping＞
?＜filter-name＞encodingFilter＜/filter-name＞
?＜url-pattern＞/*＜/url-pattern＞
?＜/filter-mapping＞