使用包装类进行全站乱码过滤

package ajax.test;


import java.io.IOException;
import java.io.UnsupportedEncodingException;


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


public class CharsetFilter implements Filter {


public void destroy() {


}


public void doFilter(ServletRequest req, ServletResponse res,
FilterChain chain) throws IOException, ServletException {
// 解决post方式乱码
req.setCharacterEncoding("utf-8");
HttpServletRequest request = (HttpServletRequest) req;
HttpServletResponse response = (HttpServletResponse) res;
MyHttpServletRequest myquest = new MyHttpServletRequest(request);
chain.doFilter(myquest, response);
}


public void init(FilterConfig arg0) throws ServletException {


}


class MyHttpServletRequest extends HttpServletRequestWrapper {


public MyHttpServletRequest(HttpServletRequest request) {
super(request);
}


@Override
public String getParameter(String name) {
String value = super.getParameter(name);
if (value == null) {
return null;
}
String method = super.getMethod();
if (method.equalsIgnoreCase("post")) {
return value;
} else {
try {
value = new String(value.getBytes("iso-8859-1"), "utf-8");
return value;
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
throw new RuntimeException();
}
}
}
}
}