java从request中获取一些常用数据类型的API
package com.sml.eplatform.common.util;import java.text.SimpleDateFormat;import java.util.Calendar;import java.util.Date;import java.util.Enumeration;import javax.servlet.http.HttpServletRequest;import org.apache.commons.lang.StringUtils;import org.apache.commons.logging.Log;import org.apache.commons.logging.LogFactory;public class RequestHelper {private static final Log log = LogFactory.getLog(RequestHelper.class);public static long getLong(HttpServletRequest request, String paraName) {String tempStr = request.getParameter(paraName);if (StringUtils.isBlank(tempStr)) {return 0;}return Long.parseLong(tempStr);}public static Long getLongNull(HttpServletRequest request, String paraName) {String tempStr = request.getParameter(paraName);if (StringUtils.isBlank(tempStr)) {return null;}return Long.parseLong(tempStr);}public static String getString(HttpServletRequest request, String paraName) {String tempStr = request.getParameter(paraName);if (StringUtils.isBlank(tempStr)) {return "";}return tempStr.trim();}public static int getInt(HttpServletRequest request, String paraName) {String tempStr = request.getParameter(paraName);if (StringUtils.isBlank(tempStr)) {return 0;}return Integer.parseInt(tempStr);}public static double getDouble(HttpServletRequest request, String paraName) {String tempStr = request.getParameter(paraName);if (StringUtils.isBlank(tempStr)) {return 0;}return Double.parseDouble(tempStr);}public static float getFloat(HttpServletRequest request, String paraName) {String tempStr = request.getParameter(paraName);if (StringUtils.isBlank(tempStr)) {return 0;}return Float.parseFloat(tempStr);}public static Date getDate(HttpServletRequest request, String paraName) {String tempStr = request.getParameter(paraName);if (StringUtils.isBlank(tempStr)) {return null;}try {return new SimpleDateFormat("dd/MM/yyyy").parse(tempStr);} catch (Exception e) {return null;}}public static Calendar getCalendar(HttpServletRequest request, String paraName) {Date date = getDate(request,paraName);Calendar cal = Calendar.getInstance();if(date!=null){cal.setTime(date);}else{cal=null;}return cal;}public static boolean getBoolean(HttpServletRequest request, String paraName) {String tempStr = request.getParameter(paraName);if (tempStr == null) {return false;}tempStr = tempStr.trim();if ("true".equalsIgnoreCase(tempStr) || "1".equals(tempStr)) {return true;}return false;}public static Boolean getBooleanNull(HttpServletRequest request, String paraName) {String tempStr = request.getParameter(paraName);if (StringUtils.isBlank(tempStr)) {return null;}tempStr = tempStr.trim();if ("true".equalsIgnoreCase(tempStr) || "1".equals(tempStr)) {return true;}return false;}public static Double[] getDoubleNullArray(HttpServletRequest request, String paraName){String tempStrArray[] = request.getParameterValues(paraName);if (tempStrArray==null || tempStrArray.length==0){return null;}Double []valueArray = new Double[tempStrArray.length];for(int i=0;i<tempStrArray.length;i++){if (StringUtils.isBlank(tempStrArray[i])){valueArray[i]=null;}else{valueArray[i] = Double.parseDouble(tempStrArray[i].trim());}}return valueArray;}public static Long[] getLongNullArray(HttpServletRequest request, String paraName){String tempStrArray[] = request.getParameterValues(paraName);if (tempStrArray==null || tempStrArray.length==0){return null;}Long []valueArray = new Long[tempStrArray.length];for(int i=0;i<tempStrArray.length;i++){if (StringUtils.isBlank(tempStrArray[i])){valueArray[i]=null;}else{valueArray[i] = Long.parseLong(tempStrArray[i].trim());}}return valueArray;}public static long[] getLongArray(HttpServletRequest request, String paraName){String tempStrArray[] = request.getParameterValues(paraName);if (tempStrArray==null || tempStrArray.length==0){return null;}long []valueArray = new long[tempStrArray.length];for(int i=0;i<tempStrArray.length;i++){if (StringUtils.isBlank(tempStrArray[i])){valueArray[i]=0;}else{valueArray[i] = Long.parseLong(tempStrArray[i].trim());}}return valueArray;}public static String[] getStringArray(HttpServletRequest request, String paraName){String tempStrArray[] = request.getParameterValues(paraName);if (tempStrArray==null || tempStrArray.length==0){return null;}for(int i=0;i<tempStrArray.length;i++){if (StringUtils.isBlank(tempStrArray[i])){tempStrArray[i]="";}else{tempStrArray[i]=tempStrArray[i].trim();}}return tempStrArray;}public static void printAllRequestParameter(HttpServletRequest request) {if (log.isTraceEnabled()) {Enumeration en = request.getParameterNames();String parameterName = null;System.out.println("<------------------print parameter begin----------------------->");String valueArray[] = null;while (en.hasMoreElements()) {parameterName = (String) en.nextElement();valueArray = request.getParameterValues(parameterName);for (String vlaue : valueArray){System.out.println(parameterName + "="+ vlaue);}}System.out.println("<------------------print parameter end------------------------->");}}public static void printAllHeaders(HttpServletRequest request) {if (log.isTraceEnabled()) {Enumeration en = request.getHeaderNames();String headerName = null;System.out.println("<------------------print header begin----------------------->");Enumeration valueArray = null;String value = null;while (en.hasMoreElements()) {headerName = (String) en.nextElement();valueArray = request.getHeaders(headerName);while(valueArray.hasMoreElements()){value = (String)valueArray.nextElement();System.out.println(headerName + "="+ value);}}System.out.println("<------------------print header end------------------------->");}}}?