自定义JSP与Servlet中文乱码过滤器

相信许多开发JSP和Servlet网站的人都会碰到一个问题：中文乱码

今天遇到这个问题，研究了一下，并简单地实现了自己的乱码拦截器，先记录下来，日后再慢慢细化！

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

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.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet Filter implementation class CharSetFilter 自定义字符拦截器，防止页面乱码
 */
@WebFilter("/*")
public class CharSetFilter implements Filter {

	/**
	 * Default constructor.
	 */
	public CharSetFilter() {
		// TODO Auto-generated constructor stub
	}

	/**
	 * @see Filter#destroy()
	 */
	public void destroy() {
		// TODO Auto-generated method stub
	}

	/**
	 * @see Filter#doFilter(ServletRequest, ServletResponse, FilterChain)
	 */

	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {
		// TODO Auto-generated method stub

		// 获取HTTP请求
		HttpServletRequest httpRequest = (HttpServletRequest) request;
		
		// 获取HTTP请求的方法
		String requestMethod = httpRequest.getMethod();

		// 判断请求方法，根据方法不同执行不同的解码
		if (requestMethod.equals("POST")) {

			httpRequest.setCharacterEncoding("utf-8");// 当请求为POST时

		} else if (requestMethod.equals("GET")) {// 当请求为GET时
			this.getDecode(httpRequest);
		}
		// pass the request along the filter chain
		chain.doFilter(httpRequest, response);
	}

	/** 对get请求参数进行解码 */
	@SuppressWarnings("rawtypes")
	public void getDecode(HttpServletRequest request)
			throws UnsupportedEncodingException {
		Enumeration enu = request.getParameterNames();
		while (enu.hasMoreElements()) {
			String paraName = (String) enu.nextElement();
			String paraValue = request.getParameter(paraName);
			paraValue = new String(paraValue.getBytes("iso-8859-1"), "utf-8");
			request.setAttribute(paraName, paraValue);
		}
	}

	/**
	 * @see Filter#init(FilterConfig)
	 */
	public void init(FilterConfig fConfig) throws ServletException {
		// TODO Auto-generated method stub
	}

}