requestutil.java

自己写的一个struts+spring+hibernate测试程序

/*
 * Created on 2006-2-16
 */
package com.common.utils;


import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

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

/**
 * <p>Title: </p>
 * <p>Description: </p>
 * <p>Copyright: Copyright (c) 2005</p>
 * <p>Company: epro</p>
 * @author tommy.zeng
 * @version 1.0
 */
/**
 * Convenience class for setting and retrieving cookies.
 */
public class RequestUtil {
    private transient static Log log = LogFactory.getLog(RequestUtil.class);

    /**
     * Convenience method to set a cookie
     *
     * @param response
     * @param name
     * @param value
     * @param path
     */
    public static void setCookie(HttpServletResponse response, String name,
                                 String value, String path) {
        if (log.isDebugEnabled()) {
            log.debug("Setting cookie '" + name + "' on path '" + path + "'");
        }

        Cookie cookie = new Cookie(name, value);
        cookie.setSecure(false);
        cookie.setPath(path);
        cookie.setMaxAge(3600 * 24 * 30); // 30 days

        response.addCookie(cookie);
    }

    /**
     * Convenience method to get a cookie by name
     *
     * @param request the current request
     * @param name the name of the cookie to find
     *
     * @return the cookie (if found), null if not found
     */
    public static Cookie getCookie(HttpServletRequest request, String name) {
        Cookie[] cookies = request.getCookies();
        Cookie returnCookie = null;

        if (cookies == null) {
            return returnCookie;
        }

        for (int i = 0; i < cookies.length; i++) {
            Cookie thisCookie = cookies[i];

            if (thisCookie.getName().equals(name)) {
                // cookies with no value do me no good!
                if (!thisCookie.getValue().equals("")) {
                    returnCookie = thisCookie;

                    break;
                }
            }
        }

        return returnCookie;
    }

    /**
     * Convenience method for deleting a cookie by name
     *
     * @param response the current web response
     * @param cookie the cookie to delete
     * @param path the path on which the cookie was set (i.e. /appfuse)
     */
    public static void deleteCookie(HttpServletResponse response,
                                    Cookie cookie, String path) {
        if (cookie != null) {
            // Delete the cookie by setting its maximum age to zero
            cookie.setMaxAge(0);
            cookie.setPath(path);
            response.addCookie(cookie);
        }
    }
    
    /**
     * Convenience method to get the application's URL based on request
     * variables.
     */
    public static String getAppURL(HttpServletRequest request) {
        StringBuffer url = new StringBuffer();
    	int port = request.getServerPort();
        if (port < 0) {
            port = 80; // Work around java.net.URL bug
        }
        String scheme = request.getScheme();
        url.append(scheme);
        url.append("://");
        url.append(request.getServerName());
        if ((scheme.equals("http") && (port != 80)) || (scheme.equals("https") && (port != 443))) {
            url.append(':');
            url.append(port);
        }
        url.append(request.getContextPath());
        return url.toString();
    }
    
    public static String getContextRealPath(HttpServletRequest request){
        return request.getSession().getServletContext().getRealPath("");
    }
    
    
    public static String[] getSelectedList(HttpServletRequest request,String key){
        String values[] = request.getParameterValues(key);
        
        return values; 
    }
    
    /**
     * Gets a parameter as a string.
     * @param request The HttpServletRequest object, known as "request" in a
     *      JSP page.
     * @param name The name of the parameter you want to get
     * @return The value of the parameter or null if the parameter was not
     *      found or if the parameter is a zero-length string.
     */
    public static String getParameter(HttpServletRequest request, String name) {
        return getParameter(request, name, false);
    }

    public static String getParameter(HttpServletRequest request, String name,String defaultValue) {
        String value = request.getParameter(name);
        if(value==null || value.length()==0){
            return defaultValue;
        }else{
            return value;
        }
    }    
    

    /**
     * Gets a parameter as a string.
     * @param request The HttpServletRequest object, known as "request" in a
     * JSP page.
     * @param name The name of the parameter you want to get
     * @param emptyStringsOK Return the parameter values even if it is an empty string.
     * @return The value of the parameter or null if the parameter was not
     *      found.
     */
    public static String getParameter(HttpServletRequest request,
            String name, boolean emptyStringsOK)
    {
        String temp = request.getParameter(name);
        if (temp != null) {
            if (temp.equals("") && !emptyStringsOK) {
                return null;
            }
            else {
                return temp;
            }
        }
        else {
            return null;
        }
    }

    /**
     * Gets a parameter as a boolean.
     * @param request The HttpServletRequest object, known as "request" in a
     * JSP page.
     * @param name The name of the parameter you want to get
     * @return True if the value of the parameter was "true", false otherwise.
     */
    public static boolean getBooleanParameter(HttpServletRequest request,
            String name)
    {
        return getBooleanParameter(request, name, false);
    }

    /**
     * Gets a parameter as a boolean.
     * @param request The HttpServletRequest object, known as "request" in a
     * JSP page.
     * @param name The name of the parameter you want to get
     * @return True if the value of the parameter was "true", false otherwise.
     */
    public static boolean getBooleanParameter(HttpServletRequest request,
            String name, boolean defaultVal)
    {
        String temp = request.getParameter(name);
        if ("true".equals(temp) || "on".equals(temp)) {
            return true;
        }
        else if ("false".equals(temp) || "off".equals(temp)) {
            return false;
        }
        else {
            return defaultVal;
        }
    }

    /**
     * Gets a parameter as an int.
     * @param request The HttpServletRequest object, known as "request" in a
     *      JSP page.
     * @param name The name of the parameter you want to get
     * @return The int value of the parameter specified or the default value if
     *      the parameter is not found.
     */
    public static int getIntParameter(HttpServletRequest request,
            String name, int defaultNum)
    {
        String temp = request.getParameter(name);
        if(temp != null && !temp.equals("")) {
            int num = defaultNum;
            try {
                num = Integer.parseInt(temp);
            }
            catch (Exception ignored) {}
            return num;
        }
        else {
            return defaultNum;
        }
    }

    /**
     * Gets a list of int parameters.
     * @param request The HttpServletRequest object, known as "request" in a
     *      JSP page.
     * @param name The name of the parameter you want to get
     * @param defaultNum The default value of a parameter, if the parameter
     * can't be converted into an int.
     */
    public static int[] getIntParameters(HttpServletRequest request,
            String name, int defaultNum)
    {
        String[] paramValues = request.getParameterValues(name);
        if (paramValues == null) {
            return null;
        }
        if (paramValues.length < 1) {
            return new int[0];
        }
        int[] values = new int[paramValues.length];
        for (int i=0; i<paramValues.length; i++) {
            try {
                values[i] = Integer.parseInt(paramValues[i]);
            }
            catch (Exception e) {
                values[i] = defaultNum;
            }
        }
        return values;
    }

    /**
     * Gets a parameter as a double.
     * @param request The HttpServletRequest object, known as "request" in a
     *      JSP page.
     * @param name The name of the parameter you want to get
     * @return The double value of the parameter specified or the default value
     *      if the parameter is not found.
     */
    public static double getDoubleParameter(HttpServletRequest request,
            String name, double defaultNum)
    {
        String temp = request.getParameter(name);
        if(temp != null && !temp.equals("")) {
            double num = defaultNum;
            try {
                num = Double.parseDouble(temp);
            }
            catch (Exception ignored) {}
            return num;
        }
        else {
            return defaultNum;
        }
    }

    /**
     * Gets a parameter as a long.
     * @param request The HttpServletRequest object, known as "request" in a
     *      JSP page.
     * @param name The name of the parameter you want to get
     * @return The long value of the parameter specified or the default value if
     *      the parameter is not found.
     */
    public static long getLongParameter(HttpServletRequest request,
            String name, long defaultNum)
    {
        String temp = request.getParameter(name);
        if (temp != null && !temp.equals("")) {
            long num = defaultNum;
            try {
                num = Long.parseLong(temp);
            }
            catch (Exception ignored) {}
            return num;
        }
        else {
            return defaultNum;
        }
    }

    /**
     * Gets a list of long parameters.
     * @param request The HttpServletRequest object, known as "request" in a
     *      JSP page.
     * @param name The name of the parameter you want to get
     * @param defaultNum The default value of a parameter, if the parameter
     * can't be converted into a long.
     */
    public static long[] getLongParameters(HttpServletRequest request,
            String name, long defaultNum)
    {
        String[] paramValues = request.getParameterValues(name);
        if (paramValues == null) {
            return null;
        }
        if (paramValues.length < 1) {
            return new long[0];
        }
        long[] values = new long[paramValues.length];
        for (int i=0; i<paramValues.length; i++) {
            try {
                values[i] = Long.parseLong(paramValues[i]);
            }
            catch (Exception e) {
                values[i] = defaultNum;
            }
        }
        return values;
    }

    /**
     * Gets a parameter as a string.
     * @param request The HttpServletRequest object, known as "request" in a
     *      JSP page.
     * @param name The name of the parameter you want to get
     * @return The value of the parameter or null if the parameter was not
     *      found or if the parameter is a zero-length string.
     */
    public static String getAttribute(HttpServletRequest request, String name) {
        return getAttribute (request, name, false);
    }

    /**
     * Gets a parameter as a string.
     * @param request The HttpServletRequest object, known as "request" in a
     *      JSP page.
     * @param name The name of the parameter you want to get
     * @param emptyStringsOK Return the parameter values even if it is an empty string.
     * @return The value of the parameter or null if the parameter was not
     *      found.
     */
    public static String getAttribute(HttpServletRequest request,
            String name, boolean emptyStringsOK)
    {
        String temp = (String)request.getAttribute(name);
        if (temp != null) {
            if (temp.equals("") && !emptyStringsOK) {
                return null;
            }
            else {
                return temp;
            }
        }
        else {
            return null;
        }
    }

    /**
     * Gets an attribute as a boolean.
     * @param request The HttpServletRequest object, known as "request" in a
     *      JSP page.
     * @param name The name of the attribute you want to get
     * @return True if the value of the attribute is "true", false otherwise.
     */
    public static boolean getBooleanAttribute(HttpServletRequest request,
            String name)
    {
        String temp = (String)request.getAttribute(name);
        if (temp != null && temp.equals("true")) {
            return true;
        }
        else {
            return false;
        }
    }

    /**
     * Gets an attribute as a int.
     * @param request The HttpServletRequest object, known as "request" in a
     *      JSP page.
     * @param name The name of the attribute you want to get
     * @return The int value of the attribute or the default value if the
     *      attribute is not found or is a zero length string.
     */
    public static int getIntAttribute(HttpServletRequest request,
            String name, int defaultNum)
    {
        String temp = (String)request.getAttribute(name);
        if (temp != null && !temp.equals("")) {
            int num = defaultNum;
            try {
                num = Integer.parseInt(temp);
            }
            catch (Exception ignored) {}
            return num;
        }
        else {
            return defaultNum;
        }
    }

    /**
     * Gets an attribute as a long.
     * @param request The HttpServletRequest object, known as "request" in a
     *      JSP page.
     * @param name The name of the attribute you want to get
     * @return The long value of the attribute or the default value if the
     *      attribute is not found or is a zero length string.
     */
    public static long getLongAttribute(HttpServletRequest request,
            String name, long defaultNum)
    {
        String temp = (String)request.getAttribute(name);
        if (temp != null && !temp.equals("")) {
            long num = defaultNum;
            try {
                num = Long.parseLong(temp);
            }
            catch (Exception ignored) {}
            return num;
        }
        else {
            return defaultNum;
        }
     }
    
    
    
    
}