filter来处理乱码问题

package sino.person.web.filter;

import java.io.IOException;
import java.util.Enumeration;

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;

public class CharacterEncodingFilter implements Filter {

	public void destroy() {
		// TODO Auto-generated method stub

	}

	public void doFilter(ServletRequest req, ServletResponse resp,
			FilterChain chain) throws IOException, ServletException {
		//判断如果客户端使用get方式提交参数，则对参数硬编码
		HttpServletRequest request = (HttpServletRequest)req;
		String method = request.getMethod();
		
		if(method.equalsIgnoreCase("get")){
			//获取地址栏中传递的所有参数名
			Enumeration names = request.getParameterNames();
			while(names.hasMoreElements()){
				//获取每个参数名
				String name = (String)names.nextElement();
				//根据参数名，获取每个参数值
				String[] ss = req.getParameterValues(name);
				//对每个值进行字符编码
				for(int i = 0; i < ss.length ; i++){
					ss[i] = new String(ss[i].getBytes("iso-8859-1"),"gbk");
				}
			}
		}
		
		//如果使用post方式提交，则设置req和resp即可
		request.setCharacterEncoding("gbk");
		resp.setCharacterEncoding("gbk");
		
		chain.doFilter(request, resp);

	}

	public void init(FilterConfig arg0) throws ServletException {
		

	}

}