HTML 特殊字符的过滤器代码,Java代码库,德仔网

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【Java】 HTML 特殊字符的过滤器

作者:大萝卜 / 发布于2015/8/3/ 437


	package web.filter;
	
	import java.io.IOException;
	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.http.HttpServletRequest;
	import javax.servlet.http.HttpServletRequestWrapper;
	import javax.servlet.http.HttpServletResponse;
	
	import com.HtmlWordsToStringUtils;
	
	public class HtmlToStringFilter implements Filter {
	
	 @Override
	 public void init(FilterConfig filterConfig) throws ServletException {
	 // TODO Auto-generated method stub
	
	 }
	
	 @Override
	 public void doFilter(ServletRequest req, ServletResponse res,
	 FilterChain chain) throws IOException, ServletException {
	
	 HttpServletRequest request = (HttpServletRequest) req;
	 HttpServletResponse response = (HttpServletResponse) res;
	
	 HTMLCharacterRequest myRequest = new HTMLCharacterRequest(request);
	
	 chain.doFilter(myRequest, response);
	 }
	
	 @Override
	 public void destroy() {
	 // TODO Auto-generated method stub
	
	 }
	
	}
	
	class HTMLCharacterRequest extends HttpServletRequestWrapper {
	 HttpServletRequest request;
	
	 public HTMLCharacterRequest(HttpServletRequest request) {
	 super(request);
	 this.request = request;
	 }
	
	 // 对需要增强方法 进行覆盖
	 @Override
	 public Map getParameterMap() {
	
	 Map<String, String[]> parameterMap = request.getParameterMap();
	 for (String parameterName : parameterMap.keySet()) {
	 String[] values = parameterMap.get(parameterName);
	 if (values != null) {
	 for (int i = 0; i < values.length; i++) {
	 try {
	 // 转义处理
	 values[i] = HtmlWordsToStringUtils.filter(values[i]);
	 } catch (Exception e) {
	 e.printStackTrace();
	 }
	 }
	 }
	 }
	 return parameterMap;
	 }
	
	 @Override
	 public String getParameter(String name) {
	 Map<String, String[]> parameterMap = getParameterMap();
	 String[] values = parameterMap.get(name);
	 if (values == null) {
	 return null;
	 }
	 // 取回参数的第一个值
	 return values[0];
	 }
	
	 @Override
	 public String[] getParameterValues(String name) {
	 Map<String, String[]> parameterMap = getParameterMap();
	 String[] values = parameterMap.get(name);
	 return values;
	 }
	
	}

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