获取HttpServletRequest请求参数的工具类

import java.math.BigDecimal;
import java.util.Enumeration;

import javax.servlet.http.HttpServletRequest;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

public class ParamUtil {
	private static Log logger = LogFactory.getLog(ParamUtil.class.getName());
	
	/**
	 * 获取当前访问的url
	 * @param request
	 * @return
	 */
	public static String getQueryUrl(HttpServletRequest request){
		return request.getContextPath() + request.getServletPath() + "?" + request.getQueryString();
	}
	
	/**
	 * 从request获取整数类型的参数
	 * @param request
	 * @param paramStr
	 * @param defaultValue
	 * @return 找不到返回null
	 */
	public static Integer getInteger(HttpServletRequest request, String paramStr){
		String value = request.getParameter(paramStr);
		if(value == null || "".equals(value)){
			return null;
		}else{
			return Integer.valueOf(value);
		}
	}
	
	/**
	 * 从request获取整数类型的参数
	 * @param request
	 * @param paramStr
	 * @param defaultValue 默认值
	 * @return
	 */
	public static Integer getInteger(HttpServletRequest request, String paramStr, Integer defaultValue){
		Integer result = getInteger(request, paramStr);
		if(result == null){
			return defaultValue;
		}else{
			return result;
		}
	}
	
	/**
	 * 从request获取整数类型的参数
	 * @param request
	 * @param paramStr
	 * @param defaultValue
	 * @return 找不到返回null
	 */
	public static BigDecimal getBigDecimal(HttpServletRequest request, String paramStr){
		String value = request.getParameter(paramStr);
		if(value == null || "".equals(value)){
			return null;
		}else{
			return new BigDecimal(value);
		}
	}
	
	/**
	 * 从request获取整数类型的参数
	 * @param request
	 * @param paramStr
	 * @param defaultValue 默认值
	 * @return
	 */
	public static BigDecimal getBigDecimal(HttpServletRequest request, String paramStr, BigDecimal defaultValue){
		BigDecimal result = getBigDecimal(request, paramStr);
		if(result == null){
			return defaultValue;
		}else{
			return result;
		}
	}
	
	/**
	 * 从request获取字符串类型的参数
	 * @param request
	 * @param paramStr
	 * @param defaultValue
	 * @return 找不到返回null
	 */
	public static String getString(HttpServletRequest request, String paramStr){
		String value = request.getParameter(paramStr);
		return value;
	}
	
	/**
	 * 从request获取字符串类型的参数
	 * @param request
	 * @param paramStr
	 * @param defaultValue 默认值
	 * @return
	 */
	public static String getString(HttpServletRequest request, String paramStr, String defaultValue){
		String result = getString(request, paramStr);
		if(result == null){
			return defaultValue;
		}else{
			return result;
		}
	}
	
	// 打印出来所有参数
	@SuppressWarnings("unchecked")
	public static void printParameters(HttpServletRequest request){
		Enumeration e = request.getParameterNames();
		logger.info("---------------------------request所有请求参数打印开始----------------------------------");
		while (e.hasMoreElements()) {
			String string = (String) e.nextElement();
			if(logger != null){
				logger.info(string+"="+request.getParameter(string));
			}
		}
		logger.info("---------------------------request所有请求参数打印结束----------------------------------");
	}
}