jetty关于http状态码处理的一个很有用的类

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public class HttpStatus
{
public final static int CONTINUE_100 = 100;
public final static int SWITCHING_PROTOCOLS_101 = 101;
public final static int PROCESSING_102 = 102;
public final static int OK_200 = 200;
public final static int CREATED_201 = 201;
public final static int ACCEPTED_202 = 202;
public final static int NON_AUTHORITATIVE_INFORMATION_203 = 203;
public final static int NO_CONTENT_204 = 204;
public final static int RESET_CONTENT_205 = 205;
public final static int PARTIAL_CONTENT_206 = 206;
public final static int MULTI_STATUS_207 = 207;
public final static int MULTIPLE_CHOICES_300 = 300;
public final static int MOVED_PERMANENTLY_301 = 301;
public final static int MOVED_TEMPORARILY_302 = 302;
public final static int FOUND_302 = 302;
public final static int SEE_OTHER_303 = 303;
public final static int NOT_MODIFIED_304 = 304;
public final static int USE_PROXY_305 = 305;
public final static int TEMPORARY_REDIRECT_307 = 307;
public final static int BAD_REQUEST_400 = 400;
public final static int UNAUTHORIZED_401 = 401;
public final static int PAYMENT_REQUIRED_402 = 402;
public final static int FORBIDDEN_403 = 403;
public final static int NOT_FOUND_404 = 404;
public final static int METHOD_NOT_ALLOWED_405 = 405;
public final static int NOT_ACCEPTABLE_406 = 406;
public final static int PROXY_AUTHENTICATION_REQUIRED_407 = 407;
public final static int REQUEST_TIMEOUT_408 = 408;
public final static int CONFLICT_409 = 409;
public final static int GONE_410 = 410;
public final static int LENGTH_REQUIRED_411 = 411;
public final static int PRECONDITION_FAILED_412 = 412;
public final static int REQUEST_ENTITY_TOO_LARGE_413 = 413;
public final static int REQUEST_URI_TOO_LONG_414 = 414;
public final static int UNSUPPORTED_MEDIA_TYPE_415 = 415;
public final static int REQUESTED_RANGE_NOT_SATISFIABLE_416 = 416;
public final static int EXPECTATION_FAILED_417 = 417;
public final static int UNPROCESSABLE_ENTITY_422 = 422;
public final static int LOCKED_423 = 423;
public final static int FAILED_DEPENDENCY_424 = 424;
public final static int INTERNAL_SERVER_ERROR_500 = 500;
public final static int NOT_IMPLEMENTED_501 = 501;
public final static int BAD_GATEWAY_502 = 502;
public final static int SERVICE_UNAVAILABLE_503 = 503;
public final static int GATEWAY_TIMEOUT_504 = 504;
public final static int HTTP_VERSION_NOT_SUPPORTED_505 = 505;
public final static int INSUFFICIENT_STORAGE_507 = 507;
public static final int MAX_CODE = 507;

private static final Code[] codeMap = new Code[MAX_CODE+1];
static
{
for (Code code : Code.values())
{
codeMap[code._code] = code;
}
}

public enum Code
{
/*
* --------------------------------------------------------------------
* Informational messages in 1xx series. As defined by ... RFC 1945 -
* HTTP/1.0 RFC 2616 - HTTP/1.1 RFC 2518 - WebDAV
*/
/** <code>100 Continue</code> */
CONTINUE(CONTINUE_100, "Continue"),
/** <code>101 Switching Protocols</code> */
SWITCHING_PROTOCOLS(SWITCHING_PROTOCOLS_101, "Switching Protocols"),
/** <code>102 Processing</code> */
PROCESSING(PROCESSING_102, "Processing"),
/*
* --------------------------------------------------------------------
* Success messages in 2xx series. As defined by ... RFC 1945 - HTTP/1.0
* RFC 2616 - HTTP/1.1 RFC 2518 - WebDAV
*/
/** <code>200 OK</code> */
OK(OK_200, "OK"),
/** <code>201 Created</code> */
CREATED(CREATED_201, "Created"),
/** <code>202 Accepted</code> */
ACCEPTED(ACCEPTED_202, "Accepted"),
/** <code>203 Non Authoritative Information</code> */
NON_AUTHORITATIVE_INFORMATION(NON_AUTHORITATIVE_INFORMATION_203, "Non Authoritative Information"),
/** <code>204 No Content</code> */
NO_CONTENT(NO_CONTENT_204, "No Content"),
/** <code>205 Reset Content</code> */
RESET_CONTENT(RESET_CONTENT_205, "Reset Content"),
/** <code>206 Partial Content</code> */
PARTIAL_CONTENT(PARTIAL_CONTENT_206, "Partial Content"),
/** <code>207 Multi-Status</code> */
MULTI_STATUS(MULTI_STATUS_207, "Multi-Status"),
/*
* --------------------------------------------------------------------
* Redirection messages in 3xx series. As defined by ... RFC 1945 -
* HTTP/1.0 RFC 2616 - HTTP/1.1
*/
/** <code>300 Mutliple Choices</code> */
MULTIPLE_CHOICES(MULTIPLE_CHOICES_300, "Multiple Choices"),
/** <code>301 Moved Permanently</code> */
MOVED_PERMANENTLY(MOVED_PERMANENTLY_301, "Moved Permanently"),
/** <code>302 Moved Temporarily</code> */
MOVED_TEMPORARILY(MOVED_TEMPORARILY_302, "Moved Temporarily"),
/** <code>302 Found</code> */
FOUND(FOUND_302, "Found"),
/** <code>303 See Other</code> */
SEE_OTHER(SEE_OTHER_303, "See Other"),
/** <code>304 Not Modified</code> */
NOT_MODIFIED(NOT_MODIFIED_304, "Not Modified"),
/** <code>305 Use Proxy</code> */
USE_PROXY(USE_PROXY_305, "Use Proxy"),
/** <code>307 Temporary Redirect</code> */
TEMPORARY_REDIRECT(TEMPORARY_REDIRECT_307, "Temporary Redirect"),
/*
* --------------------------------------------------------------------
* Client Error messages in 4xx series. As defined by ... RFC 1945 -
* HTTP/1.0 RFC 2616 - HTTP/1.1 RFC 2518 - WebDAV
*/
/** <code>400 Bad Request</code> */
BAD_REQUEST(BAD_REQUEST_400, "Bad Request"),
/** <code>401 Unauthorized</code> */
UNAUTHORIZED(UNAUTHORIZED_401, "Unauthorized"),
/** <code>402 Payment Required</code> */
PAYMENT_REQUIRED(PAYMENT_REQUIRED_402, "Payment Required"),
/** <code>403 Forbidden</code> */
FORBIDDEN(FORBIDDEN_403, "Forbidden"),
/** <code>404 Not Found</code> */
NOT_FOUND(NOT_FOUND_404, "Not Found"),
/** <code>405 Method Not Allowed</code> */
METHOD_NOT_ALLOWED(METHOD_NOT_ALLOWED_405, "Method Not Allowed"),
/** <code>406 Not Acceptable</code> */
NOT_ACCEPTABLE(NOT_ACCEPTABLE_406, "Not Acceptable"),
/** <code>407 Proxy Authentication Required</code> */
PROXY_AUTHENTICATION_REQUIRED(PROXY_AUTHENTICATION_REQUIRED_407, "Proxy Authentication Required"),
/** <code>408 Request Timeout</code> */
REQUEST_TIMEOUT(REQUEST_TIMEOUT_408, "Request Timeout"),
/** <code>409 Conflict</code> */
CONFLICT(CONFLICT_409, "Conflict"),
/** <code>410 Gone</code> */
GONE(GONE_410, "Gone"),
/** <code>411 Length Required</code> */
LENGTH_REQUIRED(LENGTH_REQUIRED_411, "Length Required"),
/** <code>412 Precondition Failed</code> */
PRECONDITION_FAILED(PRECONDITION_FAILED_412, "Precondition Failed"),
/** <code>413 Request Entity Too Large</code> */
REQUEST_ENTITY_TOO_LARGE(REQUEST_ENTITY_TOO_LARGE_413, "Request Entity Too Large"),
/** <code>414 Request-URI Too Long</code> */
REQUEST_URI_TOO_LONG(REQUEST_URI_TOO_LONG_414, "Request-URI Too Long"),
/** <code>415 Unsupported Media Type</code> */
UNSUPPORTED_MEDIA_TYPE(UNSUPPORTED_MEDIA_TYPE_415, "Unsupported Media Type"),
/** <code>416 Requested Range Not Satisfiable</code> */
REQUESTED_RANGE_NOT_SATISFIABLE(REQUESTED_RANGE_NOT_SATISFIABLE_416, "Requested Range Not Satisfiable"),
/** <code>417 Expectation Failed</code> */
EXPECTATION_FAILED(EXPECTATION_FAILED_417, "Expectation Failed"),
/** <code>422 Unprocessable Entity</code> */
UNPROCESSABLE_ENTITY(UNPROCESSABLE_ENTITY_422, "Unprocessable Entity"),
/** <code>423 Locked</code> */
LOCKED(LOCKED_423, "Locked"),
/** <code>424 Failed Dependency</code> */
FAILED_DEPENDENCY(FAILED_DEPENDENCY_424, "Failed Dependency"),
/*
* --------------------------------------------------------------------
* Server Error messages in 5xx series. As defined by ... RFC 1945 -
* HTTP/1.0 RFC 2616 - HTTP/1.1 RFC 2518 - WebDAV
*/
/** <code>500 Server Error</code> */
INTERNAL_SERVER_ERROR(INTERNAL_SERVER_ERROR_500, "Server Error"),
/** <code>501 Not Implemented</code> */
NOT_IMPLEMENTED(NOT_IMPLEMENTED_501, "Not Implemented"),
/** <code>502 Bad Gateway</code> */
BAD_GATEWAY(BAD_GATEWAY_502, "Bad Gateway"),
/** <code>503 Service Unavailable</code> */
SERVICE_UNAVAILABLE(SERVICE_UNAVAILABLE_503, "Service Unavailable"),
/** <code>504 Gateway Timeout</code> */
GATEWAY_TIMEOUT(GATEWAY_TIMEOUT_504, "Gateway Timeout"),
/** <code>505 HTTP Version Not Supported</code> */
HTTP_VERSION_NOT_SUPPORTED(HTTP_VERSION_NOT_SUPPORTED_505, "HTTP Version Not Supported"),
/** <code>507 Insufficient Storage</code> */
INSUFFICIENT_STORAGE(INSUFFICIENT_STORAGE_507, "Insufficient Storage");
private final int _code;
private final String _message;
private Code(int code, String message)
{
this._code = code;
_message=message;
}
public int getCode()
{
return _code;
}
public String getMessage()
{
return _message;
}

public boolean equals(int code)
{
return (this._code == code);
}
@Override
public String toString()
{
return String.format("[%03d %s]",this._code,this.getMessage());
}
/**
* Simple test against an code to determine if it falls into the
* <code>Informational</code> message category as defined in the <a
* href="http://tools.ietf.org/html/rfc1945">RFC 1945 - HTTP/1.0</a>,
* and <a href="http://tools.ietf.org/html/rfc2616">RFC 2616 -
* HTTP/1.1</a>.
*
* @return true if within range of codes that belongs to
*         <code>Informational</code> messages.
*/
public boolean isInformational()
{
return HttpStatus.isInformational(this._code);
}
/**
* Simple test against an code to determine if it falls into the
* <code>Success</code> message category as defined in the <a
* href="http://tools.ietf.org/html/rfc1945">RFC 1945 - HTTP/1.0</a>,
* and <a href="http://tools.ietf.org/html/rfc2616">RFC 2616 -
* HTTP/1.1</a>.
*
* @return true if within range of codes that belongs to
*         <code>Success</code> messages.
*/
public boolean isSuccess()
{
return HttpStatus.isSuccess(this._code);
}
/**
* Simple test against an code to determine if it falls into the
* <code>Redirection</code> message category as defined in the <a
* href="http://tools.ietf.org/html/rfc1945">RFC 1945 - HTTP/1.0</a>,
* and <a href="http://tools.ietf.org/html/rfc2616">RFC 2616 -
* HTTP/1.1</a>.
*
* @return true if within range of codes that belongs to
*         <code>Redirection</code> messages.
*/
public boolean isRedirection()
{
return HttpStatus.isRedirection(this._code);
}
/**
* Simple test against an code to determine if it falls into the
* <code>Client Error</code> message category as defined in the <a
* href="http://tools.ietf.org/html/rfc1945">RFC 1945 - HTTP/1.0</a>,
* and <a href="http://tools.ietf.org/html/rfc2616">RFC 2616 -
* HTTP/1.1</a>.
*
* @return true if within range of codes that belongs to
*         <code>Client Error</code> messages.
*/
public boolean isClientError()
{
return HttpStatus.isClientError(this._code);
}
/**
* Simple test against an code to determine if it falls into the
* <code>Server Error</code> message category as defined in the <a
* href="http://tools.ietf.org/html/rfc1945">RFC 1945 - HTTP/1.0</a>,
* and <a href="http://tools.ietf.org/html/rfc2616">RFC 2616 -
* HTTP/1.1</a>.
*
* @return true if within range of codes that belongs to
*         <code>Server Error</code> messages.
*/
public boolean isServerError()
{
return HttpStatus.isServerError(this._code);
}
}

/**
* Get the HttpStatusCode for a specific code
*
* @param code
*            the code to lookup.
* @return the {@link HttpStatus} if found, or null if not found.
*/
public static Code getCode(int code)
{
if (code <= MAX_CODE)
{
return codeMap[code];
}
return null;
}
/**
* Get the status message for a specific code.
*
* @param code
*            the code to look up
* @return the specific message, or the code number itself if code
*         does not match known list.
*/
public static String getMessage(int code)
{
Code codeEnum = getCode(code);
if (codeEnum != null)
{
return codeEnum.getMessage();
}
else
{
return Integer.toString(code);
}
}
/**
* Simple test against an code to determine if it falls into the
* <code>Informational</code> message category as defined in the <a
* href="http://tools.ietf.org/html/rfc1945">RFC 1945 - HTTP/1.0</a>, and <a
* href="http://tools.ietf.org/html/rfc2616">RFC 2616 - HTTP/1.1</a>.
*
* @param code
*            the code to test.
* @return true if within range of codes that belongs to
*         <code>Informational</code> messages.
*/
public static boolean isInformational(int code)
{
return ((100 <= code) && (code <= 199));
}
/**
* Simple test against an code to determine if it falls into the
* <code>Success</code> message category as defined in the <a
* href="http://tools.ietf.org/html/rfc1945">RFC 1945 - HTTP/1.0</a>, and <a
* href="http://tools.ietf.org/html/rfc2616">RFC 2616 - HTTP/1.1</a>.
*
* @param code
*            the code to test.
* @return true if within range of codes that belongs to
*         <code>Success</code> messages.
*/
public static boolean isSuccess(int code)
{
return ((200 <= code) && (code <= 299));
}
/**
* Simple test against an code to determine if it falls into the
* <code>Redirection</code> message category as defined in the <a
* href="http://tools.ietf.org/html/rfc1945">RFC 1945 - HTTP/1.0</a>, and <a
* href="http://tools.ietf.org/html/rfc2616">RFC 2616 - HTTP/1.1</a>.
*
* @param code
*            the code to test.
* @return true if within range of codes that belongs to
*         <code>Redirection</code> messages.
*/
public static boolean isRedirection(int code)
{
return ((300 <= code) && (code <= 399));
}
/**
* Simple test against an code to determine if it falls into the
* <code>Client Error</code> message category as defined in the <a
* href="http://tools.ietf.org/html/rfc1945">RFC 1945 - HTTP/1.0</a>, and <a
* href="http://tools.ietf.org/html/rfc2616">RFC 2616 - HTTP/1.1</a>.
*
* @param code
*            the code to test.
* @return true if within range of codes that belongs to
*         <code>Client Error</code> messages.
*/
public static boolean isClientError(int code)
{
return ((400 <= code) && (code <= 499));
}
/**
* Simple test against an code to determine if it falls into the
* <code>Server Error</code> message category as defined in the <a
* href="http://tools.ietf.org/html/rfc1945">RFC 1945 - HTTP/1.0</a>, and <a
* href="http://tools.ietf.org/html/rfc2616">RFC 2616 - HTTP/1.1</a>.
*
* @param code
*            the code to test.
* @return true if within range of codes that belongs to
*         <code>Server Error</code> messages.
*/
public static boolean isServerError(int code)
{
return ((500 <= code) && (code <= 599));
}
}