HttpServletRequest的处理封装（将不断更新）

不多说了，时常工作整理的，直接上代码吧，欢迎大家多提意见。

public class HttpRequestMgrComAction {
	private HttpServletRequest request = null;
	private HttpServletResponse response = null;
	
	public HttpRequestMgrComAction(HttpServletRequest request,HttpServletResponse response){
		this.request = request;
		this.response = response;
	}
	/**
	 * 判断参数是否为空
	 * @param 
	 * @return
	 * @throws Exception
	 */
	public boolean isParamStrValid(String s)throws Exception{
		boolean result = true;
		if((s==null)||("null".equalsIgnoreCase(s))||("".equalsIgnoreCase(s))){
			result = false;
		}
		return result;
	}
	/**
	 * 当参数为空时给出默认值
	 * （处理参数时，一种是用默认值，如果传入的参数必填的话，则要在程序中抛出异常，而不是给出默认值。）
	 * @param
	 * @return 
	 * @exception
	 * @author liugx
	 */	
	public String setDefaultIfMissing(String s,String replacement) throws Exception{
		String result = s;
		try{
			if(!this.isParamStrValid(result)){
				result = replacement;
			}
		}catch(Exception ex){
			ex.printStackTrace();
		}
		return result;
	}
	/**
	 * 对参数进行解码操作
	 * @param str
	 * @return
	 * @throws Exception
	 * @author liugx
	 */
	public String decodeUrlParam(String s) throws Exception{
		String result = s;
	     try{   
	    	 result = java.net.URLDecoder.decode(result, "UTF-8");               
	     }catch (Exception ex){   
	         System.out.println(ex.getMessage());   
	         ex.printStackTrace();   
	     }   
	     return result;   
	 } 
	/**
	 * 过虑表单的特殊字符
	 * @param
	 * @return 
	 * @exception
	 * @author liugx
	 */		
	public String filterSpecialChars(String s){
		if(!hasSpecialChars(s)) return s;
		StringBuffer sb = new StringBuffer(s.length());
		char c;
		for(int i=0;i<s.length();i++){
			c = s.charAt(i);
			switch(c){
				case '<':sb.append("&lt;");break; 
				case '>':sb.append("&qt;");break;
				case '"':sb.append("&quot;");break;
				case '&':sb.append("&amp;");break;
				default:sb.append(c);
			}
		}
		return sb.toString();
	}
	/**
	 * 得到压缩输出
	 * @return
	 * @throws Exception
	 * @author liugx
	 */
	public PrintWriter getGzipPrintWriter()throws Exception{
		PrintWriter out;
		if(isGzipSupoorted()){
			out = new PrintWriter(new GZIPOutputStream(this.response.getOutputStream()));
		}else{
			out = response.getWriter();
		}
		return out;
	}
	/**
	 * 关闭压缩输出
	 * @return
	 * @throws Exception
	 * @author liugx
	 */
	public void closeGzipPrintWriter(PrintWriter out) throws Exception{
		out.close();
	}

	/**
	 * 表单是否含有特殊字符
	 * @param
	 * @return
	 * @exception
	 * @author liugx
	 */
	private static boolean hasSpecialChars(String input){
		boolean flag = false;
		if((input!=null)&&(input.length()>0)){
			char c;
			for(int i=0;i<input.length();i++){
				c = input.charAt(i);
				switch(c){
					case '<':flag = true;break; 
					case '>':flag = true;break; 
					case '"':flag = true;break; 
					case '&':flag = true;break; 
				}
			}
		}
		return flag;
	}
	/**
	 * 是否支持压缩格式的传送
	 * @param
	 * @return
	 * @exception
	 * @author liugx
	 */
	private boolean isGzipSupoorted(){
		String encoding = this.request.getHeader("Accept-Encoding");
		return ((encoding != null)&&(encoding.indexOf("gzip")!=-1));
	}
	public HttpServletRequest getRequest() {
		return request;
	}
	public void setRequest(HttpServletRequest request) {
		this.request = request;
	}
	public HttpServletResponse getResponse() {
		return response;
	}
	public void setResponse(HttpServletResponse response) {
		this.response = response;
	}
}