Java tutorial
/** * @(#)ServletUtils.java, 2010-3-22. Copyright 2010 Netease, Inc. All rights * reserved. NETEASE PROPRIETARY/CONFIDENTIAL. Use is * subject to license terms. */ package com.netease.channel.util; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.springframework.web.bind.ServletRequestUtils; import javax.servlet.ServletRequest; public class ServletUtils { public static final String CONTENT_TYPE_JSON = "application/json;charset=utf-8"; public static final String CONTENT_TYPE_HTML = "text/html;charset=utf-8"; public static final String CONTENT_TYPE_JAVASCRIPT = "application/x-javascript;charset=utf-8"; public static final String HTML_CONTENT = "<html><script type=\"text/javascript\">window.parent.callback(%s)</script></html>"; private static final Log logger = LogFactory.getLog(ServletUtils.class); /** * Get an int parameter, with a fallback value. Never throws an exception. * Can pass a distinguished value as default to enable checks of whether it * was supplied. * * @param request * current HTTP request * @param name * the name of the parameter * @param defaultVal * the default value to use as fallback */ public static int getInt(ServletRequest request, String name, int defaultVal) { return ServletRequestUtils.getIntParameter(request, name, defaultVal); } /** * Get an array of int parameters, return an empty array if not found. * * @param request * current HTTP request * @param name * the name of the parameter with multiple possible values */ public static int[] getInts(ServletRequest request, String name) { return ServletRequestUtils.getIntParameters(request, name); } /** * Get a long parameter, with a fallback value. Never throws an exception. * Can pass a distinguished value as default to enable checks of whether it * was supplied. * * @param request * current HTTP request * @param name * the name of the parameter * @param defaultVal * the default value to use as fallback */ public static long getLong(ServletRequest request, String name, long defaultVal) { return ServletRequestUtils.getLongParameter(request, name, defaultVal); } /** * Get an array of long parameters, return an empty array if not found. * * @param request * current HTTP request * @param name * the name of the parameter with multiple possible values */ public static long[] getLongs(ServletRequest request, String name) { return ServletRequestUtils.getLongParameters(request, name); } /** * Get a boolean parameter, with a fallback value. Never throws an * exception. Can pass a distinguished value as default to enable checks of * whether it was supplied. * <p> * Accepts "true", "on", "yes" (any case) and "1" as values for true; treats * every other non-empty value as false (i.e. parses leniently). * * @param request * current HTTP request * @param name * the name of the parameter * @param defaultVal * the default value to use as fallback */ public static boolean getBool(ServletRequest request, String name, boolean defaultVal) { return ServletRequestUtils.getBooleanParameter(request, name, defaultVal); } /** * Get an array of boolean parameters, return an empty array if not found. * <p> * Accepts "true", "on", "yes" (any case) and "1" as values for true; treats * every other non-empty value as false (i.e. parses leniently). * * @param request * current HTTP request * @param name * the name of the parameter with multiple possible values */ public static boolean[] getBooleans(ServletRequest request, String name) { return ServletRequestUtils.getBooleanParameters(request, name); } /** * Get a String parameter, with a fallback value. Never throws an exception. * Can pass a distinguished value to default to enable checks of whether it * was supplied. * * @param request * current HTTP request * @param name * the name of the parameter * @param defaultVal * the default value to use as fallback */ public static String getStr(ServletRequest request, String name, String defaultVal) { return ServletRequestUtils.getStringParameter(request, name, defaultVal); } /** * Get an array of String parameters, return an empty array if not found. * * @param request * current HTTP request * @param name * the name of the parameter with multiple possible values */ public static String[] getStrs(ServletRequest request, String name) { return ServletRequestUtils.getStringParameters(request, name); } /** * Get a long parameter, with a fallback value. Never throws an exception. * Can pass a distinguished value as default to enable checks of whether it * was supplied. * * @param request * current HTTP request * @param name * the name of the parameter * @param defaultVal * the default value to use as fallback */ public static double getDouble(ServletRequest request, String name, long defaultVal) { return ServletRequestUtils.getDoubleParameter(request, name, defaultVal); } /** * Get an array of long parameters, return an empty array if not found. * * @param request * current HTTP request * @param name * the name of the parameter with multiple possible values */ public static double[] getDoubles(ServletRequest request, String name) { return ServletRequestUtils.getDoubleParameters(request, name); } }