过滤器复用代码【中文乱码、HTML转义】

来源：互联网发布：如何重新编译java项目编辑：程序博客网时间：2024/06/05 10:48

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());    }}

1 0