Aktuelle Version vom 21. Mai 2019, 18:22 Uhr

Code Snippets

Authentication Methods

WAR-File generieren

Aus dem lokalen Verzeichnis. (web.xml in WEB-INF Ordner muss existieren)

jar cvf SecuritySuiteDemo.war .

Date Pattern

"yyyy-MM-dd'T'HH:mm:ss.SSSZ"	2001-07-04T12:08:56.235-0700

Regex

Pattern Matching

Named Matching

<syntaxhighlight lang="java">
private @Nullable String getToken(@Nonnull String responseURL) {</pre>
String patternString = "http://www.example.com/example#(token%3D(?<TOKEN>.+))%26otherstuff(.+%)";
Pattern pattern = Pattern.compile(patternString);
Matcher matcher = pattern.matcher(responseURL);
if(matcher.find()){
return matcher.group("TOKEN");
}
return null;
}
</syntaxhighlight>

Encoding

Base64 Encoding (Basic auth)

String base64encodedUsernameAndPassword = DatatypeConverter.printBase64Binary((username + ":" + password).getBytes());
webClient.addRequestHeader("Authorization", "Basic " + base64encodedUsernameAndPassword);

URL Parsing

List<NameValuePair> params = URLEncodedUtils.parse(new URI(url), "UTF-8");

HttpsUrlConnection

In Case of any ClassCast Exception:

java.lang.ClassCastException: com.sun.net.ssl.internal.www.protocol.https.HttpsURLConnectionOldImpl cannot be cast to javax.net.ssl.HttpsURLConnection

HttpsURLConnection con = (HttpsURLConnection) new URL(null,"http://httpbin.org/digest-auth/auth/user/passwd",
new sun.net.www.protocol.https.Handler()).openConnection();
con.connect();

InputStream Reader

       int c;
       StringBuilder responseJsonString = new StringBuilder();
       int len = connection.getContentLength();
       System.out.println("Content-Length: " + len);
       if (len > 0) {
           InputStream input = connection.getInputStream();
           int i = len;
           while (((c = input.read()) != -1) && (-i > 0)) {
               System.out.print((char) c);
               responseJsonString.append((char) c);
           }
           input.close();
       } else {
   }

Mapping Object to JSON

(with Jackson JSON Mapper)

objectMapper = new ObjectMapper();
objectMapper.enable(DeserializationFeature.ACCEPT_SINGLE_VALUE_AS_ARRAY);
objectMapper.enable(MapperFeature.REQUIRE_SETTERS_FOR_GETTERS);
objectMapper.disable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES);
objectMapper.setSerializationInclusion(Include.NON_NULL);
String jsonElement = null;
try {
 jsonElement = objectMapper.writeValueAsString(a);
} catch (JsonProcessingException e) {
e.printStackTrace();
}

Generic Method

private <T> T useIncomingIfPossible(T incoming, T existing) {
   return incoming != null ? incoming : existing;
 }

Not Null