Package javax.servlet

Class ServletRequestWrapper

java.lang.Object
javax.servlet.ServletRequestWrapper
All Implemented Interfaces:
ServletRequest
Direct Known Subclasses:
HttpServletRequestWrapper
public class ServletRequestWrapper extends Object implements ServletRequest
Provides a convenient implementation of the ServletRequest interface that can be subclassed by developers wishing to adapt the request to a Servlet. This class implements the Wrapper or Decorator pattern. Methods default to calling through to the wrapped request object.
Since:
Servlet 2.3
See Also:

  • Constructor Details

    • ServletRequestWrapper

      public ServletRequestWrapper(ServletRequest request)
      Creates a ServletRequest adaptor wrapping the given request object.
      Throws:
      IllegalArgumentException - if the request is null

  • Method Details

    • getRequest

      public ServletRequest getRequest()
      Return the wrapped request object.

    • setRequest

      public void setRequest(ServletRequest request)
      Sets the request object being wrapped.
      Throws:
      IllegalArgumentException - if the request is null.

    • getAttribute

      public Object getAttribute(String name)
      The default behavior of this method is to call getAttribute(String name) on the wrapped request object.
      Specified by:
      getAttribute in interface ServletRequest
      Parameters:
      name - a String specifying the name of the attribute
      Returns:
      an Object containing the value of the attribute, or null if the attribute does not exist

    • getAttributeNames

      public Enumeration<String> getAttributeNames()
      The default behavior of this method is to return getAttributeNames() on the wrapped request object.
      Specified by:
      getAttributeNames in interface ServletRequest
      Returns:
      an Enumeration of strings containing the names of the request's attributes

    • getCharacterEncoding

      public String getCharacterEncoding()
      The default behavior of this method is to return getCharacterEncoding() on the wrapped request object.
      Specified by:
      getCharacterEncoding in interface ServletRequest
      Returns:
      a String containing the name of the character encoding, or null if the request does not specify a character encoding

    • setCharacterEncoding

      public void setCharacterEncoding(String enc) throws UnsupportedEncodingException
      The default behavior of this method is to set the character encoding on the wrapped request object.
      Specified by:
      setCharacterEncoding in interface ServletRequest
      Parameters:
      enc - String containing the name of the character encoding.
      Throws:
      UnsupportedEncodingException - if this ServletRequest is still in a state where a character encoding may be set, but the specified encoding is invalid

    • getContentLength

      public int getContentLength()
      The default behavior of this method is to return getContentLength() on the wrapped request object.
      Specified by:
      getContentLength in interface ServletRequest
      Returns:
      an integer containing the length of the request body or -1 if the length is not known or is greater than Integer.MAX_VALUE.

    • getContentLengthLong

      public long getContentLengthLong()
      The default behavior of this method is to return getContentLengthLong() on the wrapped request object.
      Specified by:
      getContentLengthLong in interface ServletRequest
      Returns:
      a long containing the length of the request body or -1L if the length is not known
      Since:
      Servlet 3.1

    • getContentType

      public String getContentType()
      The default behavior of this method is to return getContentType() on the wrapped request object.
      Specified by:
      getContentType in interface ServletRequest
      Returns:
      a String containing the name of the MIME type of the request, or null if the type is not known

    • getInputStream

      public ServletInputStream getInputStream() throws IOException
      The default behavior of this method is to return getInputStream() on the wrapped request object.
      Specified by:
      getInputStream in interface ServletRequest
      Returns:
      a ServletInputStream object containing the body of the request
      Throws:
      IOException - if an input or output exception occurred

    • getParameter

      public String getParameter(String name)
      The default behavior of this method is to return getParameter(String name) on the wrapped request object.
      Specified by:
      getParameter in interface ServletRequest
      Parameters:
      name - a String specifying the name of the parameter
      Returns:
      a String representing the single value of the parameter
      See Also:

    • getParameterMap

      public Map<String,String[]> getParameterMap()
      The default behavior of this method is to return getParameterMap() on the wrapped request object.
      Specified by:
      getParameterMap in interface ServletRequest
      Returns:
      an immutable java.util.Map containing parameter names as keys and parameter values as map values. The keys in the parameter map are of type String. The values in the parameter map are of type String array.

    • getParameterNames

      public Enumeration<String> getParameterNames()
      The default behavior of this method is to return getParameterNames() on the wrapped request object.
      Specified by:
      getParameterNames in interface ServletRequest
      Returns:
      an Enumeration of String objects, each String containing the name of a request parameter; or an empty Enumeration if the request has no parameters

    • getParameterValues

      public String[] getParameterValues(String name)
      The default behavior of this method is to return getParameterValues(String name) on the wrapped request object.
      Specified by:
      getParameterValues in interface ServletRequest
      Parameters:
      name - a String containing the name of the parameter whose value is requested
      Returns:
      an array of String objects containing the parameter's values
      See Also:

    • getProtocol

      public String getProtocol()
      The default behavior of this method is to return getProtocol() on the wrapped request object.
      Specified by:
      getProtocol in interface ServletRequest
      Returns:
      a String containing the protocol name and version number

    • getScheme

      public String getScheme()
      The default behavior of this method is to return getScheme() on the wrapped request object.
      Specified by:
      getScheme in interface ServletRequest
      Returns:
      a String containing the name of the scheme used to make this request

    • getServerName

      public String getServerName()
      The default behavior of this method is to return getServerName() on the wrapped request object.
      Specified by:
      getServerName in interface ServletRequest
      Returns:
      a String containing the name of the server

    • getServerPort

      public int getServerPort()
      The default behavior of this method is to return getServerPort() on the wrapped request object.
      Specified by:
      getServerPort in interface ServletRequest
      Returns:
      an integer specifying the port number

    • getReader

      public BufferedReader getReader() throws IOException
      The default behavior of this method is to return getReader() on the wrapped request object.
      Specified by:
      getReader in interface ServletRequest
      Returns:
      a BufferedReader containing the body of the request
      Throws:
      UnsupportedEncodingException - if the character set encoding used is not supported and the text cannot be decoded
      IOException - if an input or output exception occurred
      See Also:

    • getRemoteAddr

      public String getRemoteAddr()
      The default behavior of this method is to return getRemoteAddr() on the wrapped request object.
      Specified by:
      getRemoteAddr in interface ServletRequest
      Returns:
      a String containing the IP address of the client that sent the request

    • getRemoteHost

      public String getRemoteHost()
      The default behavior of this method is to return getRemoteHost() on the wrapped request object.
      Specified by:
      getRemoteHost in interface ServletRequest
      Returns:
      a String containing the fully qualified name of the client

    • setAttribute

      public void setAttribute(String name, Object o)
      The default behavior of this method is to return setAttribute(String name, Object o) on the wrapped request object.
      Specified by:
      setAttribute in interface ServletRequest
      Parameters:
      name - a String specifying the name of the attribute
      o - the Object to be stored

    • removeAttribute

      public void removeAttribute(String name)
      The default behavior of this method is to call removeAttribute(String name) on the wrapped request object.
      Specified by:
      removeAttribute in interface ServletRequest
      Parameters:
      name - a String specifying the name of the attribute to remove

    • getLocale

      public Locale getLocale()
      The default behavior of this method is to return getLocale() on the wrapped request object.
      Specified by:
      getLocale in interface ServletRequest
      Returns:
      the preferred Locale for the client

    • getLocales

      public Enumeration<Locale> getLocales()
      The default behavior of this method is to return getLocales() on the wrapped request object.
      Specified by:
      getLocales in interface ServletRequest
      Returns:
      an Enumeration of preferred Locale objects for the client

    • isSecure

      public boolean isSecure()
      The default behavior of this method is to return isSecure() on the wrapped request object.
      Specified by:
      isSecure in interface ServletRequest
      Returns:
      a boolean indicating if the request was made using a secure channel

    • getRequestDispatcher

      public RequestDispatcher getRequestDispatcher(String path)
      The default behavior of this method is to return getRequestDispatcher(String path) on the wrapped request object.
      Specified by:
      getRequestDispatcher in interface ServletRequest
      Parameters:
      path - a String specifying the pathname to the resource. If it is relative, it must be relative against the current servlet.
      Returns:
      a RequestDispatcher object that acts as a wrapper for the resource at the specified path, or null if the servlet container cannot return a RequestDispatcher
      See Also:

    • getRealPath

      public String getRealPath(String path)
      Deprecated.
      As of Version 2.1 of the Java Servlet API, use ServletContext.getRealPath(java.lang.String) instead
      The default behavior of this method is to return getRealPath(String path) on the wrapped request object.
      Specified by:
      getRealPath in interface ServletRequest

    • getRemotePort

      public int getRemotePort()
      The default behavior of this method is to return getRemotePort() on the wrapped request object.
      Specified by:
      getRemotePort in interface ServletRequest
      Returns:
      an integer specifying the port number
      Since:
      Servlet 2.4

    • getLocalName

      public String getLocalName()
      The default behavior of this method is to return getLocalName() on the wrapped request object.
      Specified by:
      getLocalName in interface ServletRequest
      Returns:
      a String containing the host name of the IP on which the request was received.
      Since:
      Servlet 2.4

    • getLocalAddr

      public String getLocalAddr()
      The default behavior of this method is to return getLocalAddr() on the wrapped request object.
      Specified by:
      getLocalAddr in interface ServletRequest
      Returns:
      a String containing the IP address on which the request was received.
      Since:
      Servlet 2.4

    • getLocalPort

      public int getLocalPort()
      The default behavior of this method is to return getLocalPort() on the wrapped request object.
      Specified by:
      getLocalPort in interface ServletRequest
      Returns:
      an integer specifying the port number
      Since:
      Servlet 2.4

    • getServletContext

      public ServletContext getServletContext()
      Gets the servlet context to which the wrapped servlet request was last dispatched.
      Specified by:
      getServletContext in interface ServletRequest
      Returns:
      the servlet context to which the wrapped servlet request was last dispatched
      Since:
      Servlet 3.0

    • startAsync

      public AsyncContext startAsync() throws IllegalStateException
      The default behavior of this method is to invoke ServletRequest.startAsync() on the wrapped request object.
      Specified by:
      startAsync in interface ServletRequest
      Returns:
      the (re)initialized AsyncContext
      Throws:
      IllegalStateException - if the request is within the scope of a filter or servlet that does not support asynchronous operations (that is, isAsyncSupported() returns false), or if this method is called again without any asynchronous dispatch (resulting from one of the AsyncContext.dispatch() methods), is called outside the scope of any such dispatch, or is called again within the scope of the same dispatch, or if the response has already been closed
      Since:
      Servlet 3.0
      See Also:

    • startAsync

      public AsyncContext startAsync(ServletRequest servletRequest, ServletResponse servletResponse) throws IllegalStateException
      The default behavior of this method is to invoke ServletRequest.startAsync(ServletRequest, ServletResponse) on the wrapped request object.
      Specified by:
      startAsync in interface ServletRequest
      Parameters:
      servletRequest - the ServletRequest used to initialize the AsyncContext
      servletResponse - the ServletResponse used to initialize the AsyncContext
      Returns:
      the (re)initialized AsyncContext
      Throws:
      IllegalStateException - if the request is within the scope of a filter or servlet that does not support asynchronous operations (that is, isAsyncSupported() returns false), or if this method is called again without any asynchronous dispatch (resulting from one of the AsyncContext.dispatch() methods), is called outside the scope of any such dispatch, or is called again within the scope of the same dispatch, or if the response has already been closed
      Since:
      Servlet 3.0
      See Also:

    • isAsyncStarted

      public boolean isAsyncStarted()
      Checks if the wrapped request has been put into asynchronous mode.
      Specified by:
      isAsyncStarted in interface ServletRequest
      Returns:
      true if this request has been put into asynchronous mode, false otherwise
      Since:
      Servlet 3.0
      See Also:

    • isAsyncSupported

      public boolean isAsyncSupported()
      Checks if the wrapped request supports asynchronous operation.
      Specified by:
      isAsyncSupported in interface ServletRequest
      Returns:
      true if this request supports asynchronous operation, false otherwise
      Since:
      Servlet 3.0
      See Also:

    • getAsyncContext

      public AsyncContext getAsyncContext()
      Gets the AsyncContext that was created or reinitialized by the most recent invocation of startAsync() or startAsync(ServletRequest,ServletResponse) on the wrapped request.
      Specified by:
      getAsyncContext in interface ServletRequest
      Returns:
      the AsyncContext that was created or reinitialized by the most recent invocation of startAsync() or startAsync(ServletRequest,ServletResponse) on the wrapped request
      Throws:
      IllegalStateException - if this request has not been put into asynchronous mode, i.e., if neither startAsync() nor startAsync(ServletRequest,ServletResponse) has been called
      Since:
      Servlet 3.0
      See Also:

    • isWrapperFor

      public boolean isWrapperFor(ServletRequest wrapped)
      Checks (recursively) if this ServletRequestWrapper wraps the given ServletRequest instance.
      Parameters:
      wrapped - the ServletRequest instance to search for
      Returns:
      true if this ServletRequestWrapper wraps the given ServletRequest instance, false otherwise
      Since:
      Servlet 3.0

    • isWrapperFor

      public boolean isWrapperFor(Class<?> wrappedType)
      Checks (recursively) if this ServletRequestWrapper wraps a ServletRequest of the given class type.
      Parameters:
      wrappedType - the ServletRequest class type to search for
      Returns:
      true if this ServletRequestWrapper wraps a ServletRequest of the given class type, false otherwise
      Throws:
      IllegalArgumentException - if the given class does not implement ServletRequest
      Since:
      Servlet 3.0

    • getDispatcherType

      public DispatcherType getDispatcherType()
      Gets the dispatcher type of the wrapped request.
      Specified by:
      getDispatcherType in interface ServletRequest
      Returns:
      the dispatcher type of the wrapped request
      Since:
      Servlet 3.0
      See Also: