requtils.java

一个不错的bbs论坛系统．对初学者很有帮助

package com.yhbbs.utils;

import java.io.UnsupportedEncodingException;
import javax.servlet.http.HttpServletRequest;

/**
 * <p>Title:Request的参数转换</p>
 * <li>从Request取得的各种变量类型的转换</li>
 * <br><b>CopyRight: yyhweb[由由华网]</b>
 * @author stephen
 * @version YHBBS-2.0
 */
public class ReqUtils {
	
	/**
	 * @param request request
	 * @throws UnsupportedEncodingException 
	 */
	public static void setCharacterEncoding(HttpServletRequest request) throws UnsupportedEncodingException {
		request.setCharacterEncoding("UTF-8");
	}

	/**
	 * @param request
	 * @param paramName 参数名称
	 * @return 从request获取参数对应字符串值
	 */
	public static String getString(HttpServletRequest request, String paramName) {
		String value = request.getParameter(paramName);
		return value != null ? value : "";
	}
	
	/**
	 * @param request
	 * @param paramName 参数名称
	 * @return 从request获取属性对应字符串值
	 */
	public static String getStrAtt(HttpServletRequest request, String paramName){
		String value = (String) request.getAttribute(paramName);
		return value != null ? value : "";
	}

	/**
	 * @param request
	 * @param paramName 参数名称
	 * @return 从request获取参数对应数组值
	 */
	public static String[] getArray(HttpServletRequest request, String paramName) {
		return request.getParameterValues(paramName);
	}

	/**
	 * @param request
	 * @param paramName 参数名称
	 * @return 从request获取参数对应Byte值
	 */
	public static byte getByte(HttpServletRequest request, String paramName) {
		String value = request.getParameter(paramName);
		if (value == null || value.length() == 0)
			return 0;
		else
			return Byte.parseByte(value);
	}

	/**
	 * @param request
	 * @param paramName 参数名称
	 * @return 从request获取参数对应整型值
	 */
	public static int getInt(HttpServletRequest request, String paramName) {
		String value = request.getParameter(paramName);
		if (value == null || value.length() == 0)
			return 0;
		else{
			try{
				return Integer.parseInt(value);
			}catch(Exception e){
				e.printStackTrace();
				return 0;
			}
		}
	}
	
	/**
	 * @param request
	 * @param paramName 参数名称
	 * @return 从request获取参数对应整型值
	 */
	public static int getIntAtt(HttpServletRequest request, String paramName) {
		String value = request.getAttribute(paramName).toString();
		if (value == null || value.length() == 0)
			return 0;
		else{
			try{
				return Integer.parseInt(value);
			}catch(Exception e){
				e.printStackTrace();
				return 0;
			}
		}
	}

	/**
	 * @param request
	 * @param paramName 参数名称
	 * @return 从request获取参数对应长整型值
	 */
	public static long getLong(HttpServletRequest request, String paramName) {
		String value = request.getParameter(paramName);
		if (value == null || value.length() == 0)
			return 0L;
		else{
			try{
				return Long.parseLong(value);
			}catch(Exception e){
				e.printStackTrace();
				return 0L;
			}
		}
			
	}

	/**
	 * @param request
	 * @param paramName 参数名称
	 * @return 从request获取参数对应短整型值
	 */
	public static short getShort(HttpServletRequest request, String paramName) {
		String value = request.getParameter(paramName);
		if (value == null || value.length() == 0)
			return 0;
		else
			return Short.parseShort(value);
	}

	/**
	 * @param request
	 * @param paramName 参数名称
	 * @return 从request获取参数对应布尔值
	 */
	public static boolean getBoolean(HttpServletRequest request,
			String paramName) {
		String value = request.getParameter(paramName);
		if (value == null || value.length() == 0)
			return false;
		else
			return Boolean.valueOf(value).booleanValue();
	}
}