中文乱码

public class CharacterEncodingFilter implements Filter {

    public void doFilter(ServletRequest req, ServletResponse resp,

            FilterChain chain) throws IOException, ServletException {

        HttpServletRequest request = (HttpServletRequest) req;

        HttpServletResponse response = (HttpServletResponse) resp;

        request.setCharacterEncoding("UTF-8");

        response.setCharacterEncoding("UTF-8");

        response.setContentType("text/html;charset=UTF-8");

        chain.doFilter(new MyRequest(request), response);

    }

    public void init(FilterConfig filterConfig) throws ServletException {

        // TODO Auto-generated method stub

    }

    public void destroy() {

        // TODO Auto-generated method stub

    }

}

class MyRequest extends HttpServletRequestWrapper{

    private HttpServletRequest request;

    public MyRequest(HttpServletRequest request) {

        super(request);

        this.request = request;

    }

    @Override

    public String getParameter(String name) {

        String value = this.request.getParameter(name);

        if(value==null){

            return null;

        }

        if(!this.request.getMethod().equalsIgnoreCase("get")){

            return value;

        }

        try {

            value = new String(value.getBytes("iso8859-1"),"UTF-8");

        } catch (UnsupportedEncodingException e) {

            throw new RuntimeException(e);

        }

        return value;

    }

}

过滤HTML

public class HtmlFilter implements Filter {

    public void doFilter(ServletRequest req, ServletResponse resp,

            FilterChain chain) throws IOException, ServletException {

        HttpServletRequest request = (HttpServletRequest) req;

        HttpServletResponse response = (HttpServletResponse) resp;

        chain.doFilter(new MyRequest2(request), response);

    }

    public void destroy() {

        // TODO Auto-generated method stub

    }

    public void init(FilterConfig filterConfig) throws ServletException {

        // TODO Auto-generated method stub

    }

}

class MyRequest2 extends HttpServletRequestWrapper{

    private HttpServletRequest request;

    public MyRequest2(HttpServletRequest request) {

        super(request);

        this.request = request;

    }

    @Override

    public String getParameter(String name) {

        String value = this.request.getParameter(name);

        if(value==null){

            return null;

        }

        return filter(value);

    }

    public String filter(String message) {

        if (message == null)

            return (null);

        char content[] = new char[message.length()];

        message.getChars(0, message.length(), content, 0);

        StringBuffer result = new StringBuffer(content.length + 50);

        for (int i = 0; i < content.length; i++) {

            switch (content[i]) {

            case '<':

                result.append("&lt;");

                break;

            case '>':

                result.append("&gt;");

                break;

            case '&':

                result.append("&amp;");

                break;

            case '"':

                result.append("&quot;");

                break;

            default:

                result.append(content[i]);

            }

        }

        return (result.toString());

    }

}