org.springframework.web.bind

Class ServletRequestUtils

java.lang.Object

org.springframework.web.bind.ServletRequestUtils

public abstract class ServletRequestUtils
extends Object

Parameter extraction methods, for an approach distinct from data binding, in which parameters of specific types are required.

This approach is very useful for simple submissions, where binding request parameters to a command object would be overkill.

Since:

2.0

Author:

Juergen Hoeller, Keith Donald

Constructor Summary

Constructors

Constructor and Description
ServletRequestUtils()

Method Summary

Modifier and Type	Method and Description
static Boolean	getBooleanParameter(ServletRequest request, String name) Get a Boolean parameter, or null if not present.
static boolean	getBooleanParameter(ServletRequest request, String name, boolean defaultVal) Get a boolean parameter, with a fallback value.
static boolean[]	getBooleanParameters(ServletRequest request, String name) Get an array of boolean parameters, return an empty array if not found.
static Double	getDoubleParameter(ServletRequest request, String name) Get a Double parameter, or null if not present.
static double	getDoubleParameter(ServletRequest request, String name, double defaultVal) Get a double parameter, with a fallback value.
static double[]	getDoubleParameters(ServletRequest request, String name) Get an array of double parameters, return an empty array if not found.
static Float	getFloatParameter(ServletRequest request, String name) Get a Float parameter, or null if not present.
static float	getFloatParameter(ServletRequest request, String name, float defaultVal) Get a float parameter, with a fallback value.
static float[]	getFloatParameters(ServletRequest request, String name) Get an array of float parameters, return an empty array if not found.
static Integer	getIntParameter(ServletRequest request, String name) Get an Integer parameter, or null if not present.
static int	getIntParameter(ServletRequest request, String name, int defaultVal) Get an int parameter, with a fallback value.
static int[]	getIntParameters(ServletRequest request, String name) Get an array of int parameters, return an empty array if not found.
static Long	getLongParameter(ServletRequest request, String name) Get a Long parameter, or null if not present.
static long	getLongParameter(ServletRequest request, String name, long defaultVal) Get a long parameter, with a fallback value.
static long[]	getLongParameters(ServletRequest request, String name) Get an array of long parameters, return an empty array if not found.
static boolean	getRequiredBooleanParameter(ServletRequest request, String name) Get a boolean parameter, throwing an exception if it isn't found or isn't a boolean.
static boolean[]	getRequiredBooleanParameters(ServletRequest request, String name) Get an array of boolean parameters, throwing an exception if not found or one isn't a boolean.
static double	getRequiredDoubleParameter(ServletRequest request, String name) Get a double parameter, throwing an exception if it isn't found or isn't a number.
static double[]	getRequiredDoubleParameters(ServletRequest request, String name) Get an array of double parameters, throwing an exception if not found or one is not a number.
static float	getRequiredFloatParameter(ServletRequest request, String name) Get a float parameter, throwing an exception if it isn't found or isn't a number.
static float[]	getRequiredFloatParameters(ServletRequest request, String name) Get an array of float parameters, throwing an exception if not found or one is not a number.
static int	getRequiredIntParameter(ServletRequest request, String name) Get an int parameter, throwing an exception if it isn't found or isn't a number.
static int[]	getRequiredIntParameters(ServletRequest request, String name) Get an array of int parameters, throwing an exception if not found or one is not a number..
static long	getRequiredLongParameter(ServletRequest request, String name) Get a long parameter, throwing an exception if it isn't found or isn't a number.
static long[]	getRequiredLongParameters(ServletRequest request, String name) Get an array of long parameters, throwing an exception if not found or one is not a number.
static String	getRequiredStringParameter(ServletRequest request, String name) Get a String parameter, throwing an exception if it isn't found.
static String[]	getRequiredStringParameters(ServletRequest request, String name) Get an array of String parameters, throwing an exception if not found.
static String	getStringParameter(ServletRequest request, String name) Get a String parameter, or null if not present.
static String	getStringParameter(ServletRequest request, String name, String defaultVal) Get a String parameter, with a fallback value.
static String[]	getStringParameters(ServletRequest request, String name) Get an array of String parameters, return an empty array if not found.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ServletRequestUtils

public ServletRequestUtils()

Method Detail

getIntParameter

@Nullable
public static Integer getIntParameter(ServletRequest request,
                                                String name)
                                         throws ServletRequestBindingException

Get an Integer parameter, or null if not present. Throws an exception if it the parameter value isn't a number.

Parameters:

request - current HTTP request

name - the name of the parameter

Returns:

the Integer value, or null if not present

Throws:

ServletRequestBindingException - a subclass of ServletException, so it doesn't need to be caught

getIntParameter

public static int getIntParameter(ServletRequest request,
                                  String name,
                                  int defaultVal)

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.

Parameters:

request - current HTTP request

name - the name of the parameter

defaultVal - the default value to use as fallback

getIntParameters

public static int[] getIntParameters(ServletRequest request,
                                     String name)

Get an array of int parameters, return an empty array if not found.

Parameters:

request - current HTTP request

name - the name of the parameter with multiple possible values

getRequiredIntParameter

public static int getRequiredIntParameter(ServletRequest request,
                                          String name)
                                   throws ServletRequestBindingException

Get an int parameter, throwing an exception if it isn't found or isn't a number.

Parameters:

request - current HTTP request

name - the name of the parameter

Throws:

ServletRequestBindingException - a subclass of ServletException, so it doesn't need to be caught

getRequiredIntParameters

public static int[] getRequiredIntParameters(ServletRequest request,
                                             String name)
                                      throws ServletRequestBindingException

Get an array of int parameters, throwing an exception if not found or one is not a number..

Parameters:

request - current HTTP request

name - the name of the parameter with multiple possible values

Throws:

ServletRequestBindingException - a subclass of ServletException, so it doesn't need to be caught

getLongParameter

@Nullable
public static Long getLongParameter(ServletRequest request,
                                              String name)
                                       throws ServletRequestBindingException

Get a Long parameter, or null if not present. Throws an exception if it the parameter value isn't a number.

Parameters:

request - current HTTP request

name - the name of the parameter

Returns:

the Long value, or null if not present

Throws:

ServletRequestBindingException - a subclass of ServletException, so it doesn't need to be caught

getLongParameter

public static long getLongParameter(ServletRequest request,
                                    String name,
                                    long defaultVal)

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.

Parameters:

request - current HTTP request

name - the name of the parameter

defaultVal - the default value to use as fallback

getLongParameters

public static long[] getLongParameters(ServletRequest request,
                                       String name)

Get an array of long parameters, return an empty array if not found.

Parameters:

request - current HTTP request

name - the name of the parameter with multiple possible values

getRequiredLongParameter

public static long getRequiredLongParameter(ServletRequest request,
                                            String name)
                                     throws ServletRequestBindingException

Get a long parameter, throwing an exception if it isn't found or isn't a number.

Parameters:

request - current HTTP request

name - the name of the parameter

Throws:

ServletRequestBindingException - a subclass of ServletException, so it doesn't need to be caught

getRequiredLongParameters

public static long[] getRequiredLongParameters(ServletRequest request,
                                               String name)
                                        throws ServletRequestBindingException

Get an array of long parameters, throwing an exception if not found or one is not a number.

Parameters:

request - current HTTP request

name - the name of the parameter with multiple possible values

Throws:

ServletRequestBindingException - a subclass of ServletException, so it doesn't need to be caught

getFloatParameter

@Nullable
public static Float getFloatParameter(ServletRequest request,
                                                String name)
                                         throws ServletRequestBindingException

Get a Float parameter, or null if not present. Throws an exception if it the parameter value isn't a number.

Parameters:

request - current HTTP request

name - the name of the parameter

Returns:

the Float value, or null if not present

Throws:

ServletRequestBindingException - a subclass of ServletException, so it doesn't need to be caught

getFloatParameter

public static float getFloatParameter(ServletRequest request,
                                      String name,
                                      float defaultVal)

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.

Parameters:

request - current HTTP request

name - the name of the parameter

defaultVal - the default value to use as fallback

getFloatParameters

public static float[] getFloatParameters(ServletRequest request,
                                         String name)

Get an array of float parameters, return an empty array if not found.

Parameters:

request - current HTTP request

name - the name of the parameter with multiple possible values

getRequiredFloatParameter

public static float getRequiredFloatParameter(ServletRequest request,
                                              String name)
                                       throws ServletRequestBindingException

Get a float parameter, throwing an exception if it isn't found or isn't a number.

Parameters:

request - current HTTP request

name - the name of the parameter

Throws:

ServletRequestBindingException - a subclass of ServletException, so it doesn't need to be caught

getRequiredFloatParameters

public static float[] getRequiredFloatParameters(ServletRequest request,
                                                 String name)
                                          throws ServletRequestBindingException

Get an array of float parameters, throwing an exception if not found or one is not a number.

Parameters:

request - current HTTP request

name - the name of the parameter with multiple possible values

Throws:

ServletRequestBindingException - a subclass of ServletException, so it doesn't need to be caught

getDoubleParameter

@Nullable
public static Double getDoubleParameter(ServletRequest request,
                                                  String name)
                                           throws ServletRequestBindingException

Get a Double parameter, or null if not present. Throws an exception if it the parameter value isn't a number.

Parameters:

request - current HTTP request

name - the name of the parameter

Returns:

the Double value, or null if not present

Throws:

ServletRequestBindingException - a subclass of ServletException, so it doesn't need to be caught

getDoubleParameter

public static double getDoubleParameter(ServletRequest request,
                                        String name,
                                        double defaultVal)

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.

Parameters:

request - current HTTP request

name - the name of the parameter

defaultVal - the default value to use as fallback

getDoubleParameters

public static double[] getDoubleParameters(ServletRequest request,
                                           String name)

Get an array of double parameters, return an empty array if not found.

Parameters:

request - current HTTP request

name - the name of the parameter with multiple possible values

getRequiredDoubleParameter

public static double getRequiredDoubleParameter(ServletRequest request,
                                                String name)
                                         throws ServletRequestBindingException

Get a double parameter, throwing an exception if it isn't found or isn't a number.

Parameters:

request - current HTTP request

name - the name of the parameter

Throws:

ServletRequestBindingException - a subclass of ServletException, so it doesn't need to be caught

getRequiredDoubleParameters

public static double[] getRequiredDoubleParameters(ServletRequest request,
                                                   String name)
                                            throws ServletRequestBindingException

Get an array of double parameters, throwing an exception if not found or one is not a number.

Parameters:

request - current HTTP request

name - the name of the parameter with multiple possible values

Throws:

ServletRequestBindingException - a subclass of ServletException, so it doesn't need to be caught

getBooleanParameter

@Nullable
public static Boolean getBooleanParameter(ServletRequest request,
                                                    String name)
                                             throws ServletRequestBindingException

Get a Boolean parameter, or null if not present. Throws an exception if it the parameter value isn't a boolean.

Accepts "true", "on", "yes" (any case) and "1" as values for true; treats every other non-empty value as false (i.e. parses leniently).

Parameters:

request - current HTTP request

name - the name of the parameter

Returns:

the Boolean value, or null if not present

Throws:

ServletRequestBindingException - a subclass of ServletException, so it doesn't need to be caught

getBooleanParameter

public static boolean getBooleanParameter(ServletRequest request,
                                          String name,
                                          boolean defaultVal)

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.

Accepts "true", "on", "yes" (any case) and "1" as values for true; treats every other non-empty value as false (i.e. parses leniently).

Parameters:

request - current HTTP request

name - the name of the parameter

defaultVal - the default value to use as fallback

getBooleanParameters

public static boolean[] getBooleanParameters(ServletRequest request,
                                             String name)

Get an array of boolean parameters, return an empty array if not found.

Accepts "true", "on", "yes" (any case) and "1" as values for true; treats every other non-empty value as false (i.e. parses leniently).

Parameters:

request - current HTTP request

name - the name of the parameter with multiple possible values

getRequiredBooleanParameter

public static boolean getRequiredBooleanParameter(ServletRequest request,
                                                  String name)
                                           throws ServletRequestBindingException

Get a boolean parameter, throwing an exception if it isn't found or isn't a boolean.

Accepts "true", "on", "yes" (any case) and "1" as values for true; treats every other non-empty value as false (i.e. parses leniently).

Parameters:

request - current HTTP request

name - the name of the parameter

Throws:

ServletRequestBindingException - a subclass of ServletException, so it doesn't need to be caught

getRequiredBooleanParameters

public static boolean[] getRequiredBooleanParameters(ServletRequest request,
                                                     String name)
                                              throws ServletRequestBindingException

Get an array of boolean parameters, throwing an exception if not found or one isn't a boolean.

Accepts "true", "on", "yes" (any case) and "1" as values for true; treats every other non-empty value as false (i.e. parses leniently).

Parameters:

request - current HTTP request

name - the name of the parameter

Throws:

ServletRequestBindingException - a subclass of ServletException, so it doesn't need to be caught

getStringParameter

@Nullable
public static String getStringParameter(ServletRequest request,
                                                  String name)
                                           throws ServletRequestBindingException

Get a String parameter, or null if not present.

Parameters:

request - current HTTP request

name - the name of the parameter

Returns:

the String value, or null if not present

Throws:

ServletRequestBindingException - a subclass of ServletException, so it doesn't need to be caught

getStringParameter

public static String getStringParameter(ServletRequest request,
                                        String name,
                                        String defaultVal)

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.

Parameters:

request - current HTTP request

name - the name of the parameter

defaultVal - the default value to use as fallback

getStringParameters

public static String[] getStringParameters(ServletRequest request,
                                           String name)

Get an array of String parameters, return an empty array if not found.

Parameters:

request - current HTTP request

name - the name of the parameter with multiple possible values

getRequiredStringParameter

public static String getRequiredStringParameter(ServletRequest request,
                                                String name)
                                         throws ServletRequestBindingException

Get a String parameter, throwing an exception if it isn't found.

Parameters:

request - current HTTP request

name - the name of the parameter

Throws:

ServletRequestBindingException - a subclass of ServletException, so it doesn't need to be caught

getRequiredStringParameters

public static String[] getRequiredStringParameters(ServletRequest request,
                                                   String name)
                                            throws ServletRequestBindingException

Get an array of String parameters, throwing an exception if not found.

Parameters:

request - current HTTP request

name - the name of the parameter

Throws:

ServletRequestBindingException - a subclass of ServletException, so it doesn't need to be caught