/*
* Copyright 2002-2017 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.web.bind;
import javax.servlet.ServletRequest;
import org.springframework.lang.Nullable;
/**
* Parameter extraction methods, for an approach distinct from data binding,
* in which parameters of specific types are required.
*
* <p>This approach is very useful for simple submissions, where binding
* request parameters to a command object would be overkill.
*
* @author Juergen Hoeller
* @author Keith Donald
* @since 2.0
*/
public abstract class ServletRequestUtils {
private static final IntParser INT_PARSER = new IntParser();
private static final LongParser LONG_PARSER = new LongParser();
private static final FloatParser FLOAT_PARSER = new FloatParser();
private static final DoubleParser DOUBLE_PARSER = new DoubleParser();
private static final BooleanParser BOOLEAN_PARSER = new BooleanParser();
private static final StringParser STRING_PARSER = new StringParser();
/**
* Get an Integer parameter, or {@code null} if not present.
* Throws an exception if it the parameter value isn't a number.
* @param request current HTTP request
* @param name the name of the parameter
* @return the Integer value, or {@code null} if not present
* @throws ServletRequestBindingException a subclass of ServletException,
* so it doesn't need to be caught
*/
@Nullable
public static Integer getIntParameter(ServletRequest request, String name)
throws ServletRequestBindingException {
if (request.getParameter(name) == null) {
return null;
}
return getRequiredIntParameter(request, name);
}
/**
* 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 getIntParameter(ServletRequest request, String name, int defaultVal) {
if (request.getParameter(name) == null) {
return defaultVal;
}
try {
return getRequiredIntParameter(request, name);
}
catch (ServletRequestBindingException ex) {
return 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[] getIntParameters(ServletRequest request, String name) {
try {
return getRequiredIntParameters(request, name);
}
catch (ServletRequestBindingException ex) {
return new int[0];
}
}
/**
* Get an int parameter, throwing an exception if it isn't found or isn't a number.
* @param request current HTTP request
* @param name the name of the parameter
* @throws ServletRequestBindingException a subclass of ServletException,
* so it doesn't need to be caught
*/
public static int getRequiredIntParameter(ServletRequest request, String name)
throws ServletRequestBindingException {
return INT_PARSER.parseInt(name, request.getParameter(name));
}
/**
* Get an array of int parameters, throwing an exception if not found or one is not a number..
* @param request current HTTP request
* @param name the name of the parameter with multiple possible values
* @throws ServletRequestBindingException a subclass of ServletException,
* so it doesn't need to be caught
*/
public static int[] getRequiredIntParameters(ServletRequest request, String name)
throws ServletRequestBindingException {
return INT_PARSER.parseInts(name, request.getParameterValues(name));
}
/**
* Get a Long parameter, or {@code null} if not present.
* Throws an exception if it the parameter value isn't a number.
* @param request current HTTP request
* @param name the name of the parameter
* @return the Long value, or {@code null} if not present
* @throws ServletRequestBindingException a subclass of ServletException,
* so it doesn't need to be caught
*/
@Nullable
public static Long getLongParameter(ServletRequest request, String name)
throws ServletRequestBindingException {
if (request.getParameter(name) == null) {
return null;
}
return getRequiredLongParameter(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 getLongParameter(ServletRequest request, String name, long defaultVal) {
if (request.getParameter(name) == null) {
return defaultVal;
}
try {
return getRequiredLongParameter(request, name);
}
catch (ServletRequestBindingException ex) {
return 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[] getLongParameters(ServletRequest request, String name) {
try {
return getRequiredLongParameters(request, name);
}
catch (ServletRequestBindingException ex) {
return new long[0];
}
}
/**
* Get a long parameter, throwing an exception if it isn't found or isn't a number.
* @param request current HTTP request
* @param name the name of the parameter
* @throws ServletRequestBindingException a subclass of ServletException,
* so it doesn't need to be caught
*/
public static long getRequiredLongParameter(ServletRequest request, String name)
throws ServletRequestBindingException {
return LONG_PARSER.parseLong(name, request.getParameter(name));
}
/**
* Get an array of long parameters, throwing an exception if not found or one is not a number.
* @param request current HTTP request
* @param name the name of the parameter with multiple possible values
* @throws ServletRequestBindingException a subclass of ServletException,
* so it doesn't need to be caught
*/
public static long[] getRequiredLongParameters(ServletRequest request, String name)
throws ServletRequestBindingException {
return LONG_PARSER.parseLongs(name, request.getParameterValues(name));
}
/**
* Get a Float parameter, or {@code null} if not present.
* Throws an exception if it the parameter value isn't a number.
* @param request current HTTP request
* @param name the name of the parameter
* @return the Float value, or {@code null} if not present
* @throws ServletRequestBindingException a subclass of ServletException,
* so it doesn't need to be caught
*/
@Nullable
public static Float getFloatParameter(ServletRequest request, String name)
throws ServletRequestBindingException {
if (request.getParameter(name) == null) {
return null;
}
return getRequiredFloatParameter(request, name);
}
/**
* Get a float 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 float getFloatParameter(ServletRequest request, String name, float defaultVal) {
if (request.getParameter(name) == null) {
return defaultVal;
}
try {
return getRequiredFloatParameter(request, name);
}
catch (ServletRequestBindingException ex) {
return defaultVal;
}
}
/**
* Get an array of float 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 float[] getFloatParameters(ServletRequest request, String name) {
try {
return getRequiredFloatParameters(request, name);
}
catch (ServletRequestBindingException ex) {
return new float[0];
}
}
/**
* Get a float parameter, throwing an exception if it isn't found or isn't a number.
* @param request current HTTP request
* @param name the name of the parameter
* @throws ServletRequestBindingException a subclass of ServletException,
* so it doesn't need to be caught
*/
public static float getRequiredFloatParameter(ServletRequest request, String name)
throws ServletRequestBindingException {
return FLOAT_PARSER.parseFloat(name, request.getParameter(name));
}
/**
* Get an array of float parameters, throwing an exception if not found or one is not a number.
* @param request current HTTP request
* @param name the name of the parameter with multiple possible values
* @throws ServletRequestBindingException a subclass of ServletException,
* so it doesn't need to be caught
*/
public static float[] getRequiredFloatParameters(ServletRequest request, String name)
throws ServletRequestBindingException {
return FLOAT_PARSER.parseFloats(name, request.getParameterValues(name));
}
/**
* Get a Double parameter, or {@code null} if not present.
* Throws an exception if it the parameter value isn't a number.
* @param request current HTTP request
* @param name the name of the parameter
* @return the Double value, or {@code null} if not present
* @throws ServletRequestBindingException a subclass of ServletException,
* so it doesn't need to be caught
*/
@Nullable
public static Double getDoubleParameter(ServletRequest request, String name)
throws ServletRequestBindingException {
if (request.getParameter(name) == null) {
return null;
}
return getRequiredDoubleParameter(request, name);
}
/**
* Get a double 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 getDoubleParameter(ServletRequest request, String name, double defaultVal) {
if (request.getParameter(name) == null) {
return defaultVal;
}
try {
return getRequiredDoubleParameter(request, name);
}
catch (ServletRequestBindingException ex) {
return defaultVal;
}
}
/**
* Get an array of double 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[] getDoubleParameters(ServletRequest request, String name) {
try {
return getRequiredDoubleParameters(request, name);
}
catch (ServletRequestBindingException ex) {
return new double[0];
}
}
/**
* Get a double parameter, throwing an exception if it isn't found or isn't a number.
* @param request current HTTP request
* @param name the name of the parameter
* @throws ServletRequestBindingException a subclass of ServletException,
* so it doesn't need to be caught
*/
public static double getRequiredDoubleParameter(ServletRequest request, String name)
throws ServletRequestBindingException {
return DOUBLE_PARSER.parseDouble(name, request.getParameter(name));
}
/**
* Get an array of double parameters, throwing an exception if not found or one is not a number.
* @param request current HTTP request
* @param name the name of the parameter with multiple possible values
* @throws ServletRequestBindingException a subclass of ServletException,
* so it doesn't need to be caught
*/
public static double[] getRequiredDoubleParameters(ServletRequest request, String name)
throws ServletRequestBindingException {
return DOUBLE_PARSER.parseDoubles(name, request.getParameterValues(name));
}
/**
* Get a Boolean parameter, or {@code null} if not present.
* Throws an exception if it the parameter value isn't a boolean.
* <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
* @return the Boolean value, or {@code null} if not present
* @throws ServletRequestBindingException a subclass of ServletException,
* so it doesn't need to be caught
*/
@Nullable
public static Boolean getBooleanParameter(ServletRequest request, String name)
throws ServletRequestBindingException {
if (request.getParameter(name) == null) {
return null;
}
return (getRequiredBooleanParameter(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 getBooleanParameter(ServletRequest request, String name, boolean defaultVal) {
if (request.getParameter(name) == null) {
return defaultVal;
}
try {
return getRequiredBooleanParameter(request, name);
}
catch (ServletRequestBindingException ex) {
return 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[] getBooleanParameters(ServletRequest request, String name) {
try {
return getRequiredBooleanParameters(request, name);
}
catch (ServletRequestBindingException ex) {
return new boolean[0];
}
}
/**
* Get a boolean parameter, throwing an exception if it isn't found
* or isn't a boolean.
* <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
* @throws ServletRequestBindingException a subclass of ServletException,
* so it doesn't need to be caught
*/
public static boolean getRequiredBooleanParameter(ServletRequest request, String name)
throws ServletRequestBindingException {
return BOOLEAN_PARSER.parseBoolean(name, request.getParameter(name));
}
/**
* Get an array of boolean parameters, throwing an exception if not found
* or one isn't a boolean.
* <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
* @throws ServletRequestBindingException a subclass of ServletException,
* so it doesn't need to be caught
*/
public static boolean[] getRequiredBooleanParameters(ServletRequest request, String name)
throws ServletRequestBindingException {
return BOOLEAN_PARSER.parseBooleans(name, request.getParameterValues(name));
}
/**
* Get a String parameter, or {@code null} if not present.
* @param request current HTTP request
* @param name the name of the parameter
* @return the String value, or {@code null} if not present
* @throws ServletRequestBindingException a subclass of ServletException,
* so it doesn't need to be caught
*/
@Nullable
public static String getStringParameter(ServletRequest request, String name)
throws ServletRequestBindingException {
if (request.getParameter(name) == null) {
return null;
}
return getRequiredStringParameter(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 getStringParameter(ServletRequest request, String name, String defaultVal) {
String val = request.getParameter(name);
return (val != null ? val : 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[] getStringParameters(ServletRequest request, String name) {
try {
return getRequiredStringParameters(request, name);
}
catch (ServletRequestBindingException ex) {
return new String[0];
}
}
/**
* Get a String parameter, throwing an exception if it isn't found.
* @param request current HTTP request
* @param name the name of the parameter
* @throws ServletRequestBindingException a subclass of ServletException,
* so it doesn't need to be caught
*/
public static String getRequiredStringParameter(ServletRequest request, String name)
throws ServletRequestBindingException {
return STRING_PARSER.validateRequiredString(name, request.getParameter(name));
}
/**
* Get an array of String parameters, throwing an exception if not found.
* @param request current HTTP request
* @param name the name of the parameter
* @throws ServletRequestBindingException a subclass of ServletException,
* so it doesn't need to be caught
*/
public static String[] getRequiredStringParameters(ServletRequest request, String name)
throws ServletRequestBindingException {
return STRING_PARSER.validateRequiredStrings(name, request.getParameterValues(name));
}
private abstract static class ParameterParser<T> {
protected final T parse(String name, String parameter) throws ServletRequestBindingException {
validateRequiredParameter(name, parameter);
try {
return doParse(parameter);
}
catch (NumberFormatException ex) {
throw new ServletRequestBindingException(
"Required " + getType() + " parameter '" + name + "' with value of '" +
parameter + "' is not a valid number", ex);
}
}
protected final void validateRequiredParameter(String name, @Nullable Object parameter)
throws ServletRequestBindingException {
if (parameter == null) {
throw new MissingServletRequestParameterException(name, getType());
}
}
protected abstract String getType();
protected abstract T doParse(String parameter) throws NumberFormatException;
}
private static class IntParser extends ParameterParser<Integer> {
@Override
protected String getType() {
return "int";
}
@Override
protected Integer doParse(String s) throws NumberFormatException {
return Integer.valueOf(s);
}
public int parseInt(String name, String parameter) throws ServletRequestBindingException {
return parse(name, parameter);
}
public int[] parseInts(String name, String[] values) throws ServletRequestBindingException {
validateRequiredParameter(name, values);
int[] parameters = new int[values.length];
for (int i = 0; i < values.length; i++) {
parameters[i] = parseInt(name, values[i]);
}
return parameters;
}
}
private static class LongParser extends ParameterParser<Long> {
@Override
protected String getType() {
return "long";
}
@Override
protected Long doParse(String parameter) throws NumberFormatException {
return Long.valueOf(parameter);
}
public long parseLong(String name, String parameter) throws ServletRequestBindingException {
return parse(name, parameter);
}
public long[] parseLongs(String name, String[] values) throws ServletRequestBindingException {
validateRequiredParameter(name, values);
long[] parameters = new long[values.length];
for (int i = 0; i < values.length; i++) {
parameters[i] = parseLong(name, values[i]);
}
return parameters;
}
}
private static class FloatParser extends ParameterParser<Float> {
@Override
protected String getType() {
return "float";
}
@Override
protected Float doParse(String parameter) throws NumberFormatException {
return Float.valueOf(parameter);
}
public float parseFloat(String name, String parameter) throws ServletRequestBindingException {
return parse(name, parameter);
}
public float[] parseFloats(String name, String[] values) throws ServletRequestBindingException {
validateRequiredParameter(name, values);
float[] parameters = new float[values.length];
for (int i = 0; i < values.length; i++) {
parameters[i] = parseFloat(name, values[i]);
}
return parameters;
}
}
private static class DoubleParser extends ParameterParser<Double> {
@Override
protected String getType() {
return "double";
}
@Override
protected Double doParse(String parameter) throws NumberFormatException {
return Double.valueOf(parameter);
}
public double parseDouble(String name, String parameter) throws ServletRequestBindingException {
return parse(name, parameter);
}
public double[] parseDoubles(String name, String[] values) throws ServletRequestBindingException {
validateRequiredParameter(name, values);
double[] parameters = new double[values.length];
for (int i = 0; i < values.length; i++) {
parameters[i] = parseDouble(name, values[i]);
}
return parameters;
}
}
private static class BooleanParser extends ParameterParser<Boolean> {
@Override
protected String getType() {
return "boolean";
}
@Override
protected Boolean doParse(String parameter) throws NumberFormatException {
return (parameter.equalsIgnoreCase("true") || parameter.equalsIgnoreCase("on") ||
parameter.equalsIgnoreCase("yes") || parameter.equals("1"));
}
public boolean parseBoolean(String name, String parameter) throws ServletRequestBindingException {
return parse(name, parameter);
}
public boolean[] parseBooleans(String name, String[] values) throws ServletRequestBindingException {
validateRequiredParameter(name, values);
boolean[] parameters = new boolean[values.length];
for (int i = 0; i < values.length; i++) {
parameters[i] = parseBoolean(name, values[i]);
}
return parameters;
}
}
private static class StringParser extends ParameterParser<String> {
@Override
protected String getType() {
return "string";
}
@Override
protected String doParse(String parameter) throws NumberFormatException {
return parameter;
}
public String validateRequiredString(String name, String value) throws ServletRequestBindingException {
validateRequiredParameter(name, value);
return value;
}
public String[] validateRequiredStrings(String name, String[] values) throws ServletRequestBindingException {
validateRequiredParameter(name, values);
for (String value : values) {
validateRequiredParameter(name, value);
}
return values;
}
}
}
