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//获取code
OAuthAuthzRequest oauthRequest = new OAuthAuthzRequest(request);
//生成授权码
String authorizationCode = null;
//responseType目前公支持CODE,另外还有TOKEN
String responseType = oauthRequest.getResponseType();
if (responseType.equals(ResponseType.CODE.toString())) {
        //code生成
	OAuthIssuerImpl oauthIssuerImpl = new OAuthIssuerImpl(new MD5Generator());
	authorizationCode = oauthIssuerImpl.authorizationCode();
} else {
	throw OAuthUtils.handleOAuthProblemException(OAuthState.unsupported_response_type);
}

//获取token
OAuthTokenRequest oauthRequest = new OAuthTokenRequest(request);					
		
// 检查验证类型，此处只检查AUTHORIZATION_CODE类型，其他的还有PASSWORD或REFRESH_TOKEN
String authCode = oauthRequest.getParam(OAuth.OAUTH_CODE);
if (oauthRequest.getParam(OAuth.OAUTH_GRANT_TYPE).equals(GrantType.AUTHORIZATION_CODE.toString())) {
    if (!oAuthBPO.checkAuthCode(authCode)) {
       throw OAuthUtils.handleOAuthProblemException(OAuthState.invalid_grant);
    }
} else {
	throw OAuthUtils.handleOAuthProblemException(OAuthState.unsupported_grant_type);
}

try {
	OAuthSignatureMethod.newSigner(request).validate(request, credentials.getClientSecret());
} catch (URISyntaxException e) {
	e.printStackTrace();
} catch (IOException e) {
	e.printStackTrace();
}