java

问题 Our application used to have only one possibility to log in: username and password. Once a new user logged into the application, their session would appear in Spring Security's SessionRegistry . Now I'm implementing SAML support with the help of Spring SAML. I oriented the setup heavily towards the sample application's configuration. It all works fine. However I noticed that users that log in via SAML don't get their session added to the SessionRegistry . The usual context file for form based

问题 I need to extract all the words in a string before a specific character, in this example a colon (:). For example: String temp = "root/naming-will-look-like-this:1.0.0-SNAP"; From the string above I would like to return: "root" "naming" "will" "look" "like" "this" I'm not great at regular expressions, and I've come up with this so far. \w+(?=:) Which only returns me the one word directly preceding the colon ("this"). How can I retrieve all words before? Thanks in advance. 回答1: You can use a

问题 I need to be able to add this code ... I want to modify to this code to add/edit/remove headers and footers from the PDF. public void onEndPage(PdfWriter writer, Document document) { PdfContentByte cb = writer.getDirectContent(); if (document.getPageNumber() > 1) { ColumnText.showTextAligned(cb, Element.ALIGN_CENTER, header, (document.right() - document .left()) / 2 + document.leftMargin(), document.top() + 10, 0); } footer.writeSelectedRows(0, -1, (document.right() - document.left() - 300) /

问题 This question has been asked before but I still cannot figure whats wrong for some reason. I got a class named NewClass in package syntaxtest in file src. From src path I type : javac src/syntaxtest/NewClass.java and the class is compiled and I can see NewClass.class in syntaxtest folder. Now from that same path or even the same folder with NewClass.class, I can't figure out how to run the class from terminal. I have made many different attempts but ether I get ClassDefNotFound or

问题 I am trying to use LocalDate in my entities and this usage has plenty of documentation around the net. Which is why I am baffled it doesn't work. Here is my error: com.mysql.jdbc.MysqlDataTruncation: Data truncation: Incorrect date value: '\xAC\xED\x00\x05sr\x00\x0Djava.time.Ser\x95]\x84\xBA\x1B"H\xB2\x0C\x00\x00xpw\x07\x03\x00\x00\x07\xD7\x0C\x03x' So, it obviously needs a converter. I have tried the following links: This one says to add the spring converters to the scan path for the

问题 Just a simple class calls a class that prints an array. I get a syntax error in Eclipse. I also get an error that I don't have a method called Kremalation. public class AytiMain { public static void main(String[] args) { AytiMain.Kremalation(); } } public class Kremalation { String[] ena = { "PEINAW", "PEINOUSA", "PETHAINW" }; int i; // <= syntax error on token ";", { expected after this token for (i = 0; i <= ena.lenght; i++) System.out.println(ena[i]); } } 回答1: You have code (which is not

问题 So what my program does is that it reads user input and prints out a series of prime numbers that leads up to the input. So for example, if I input 20 the sequence should print out 2 5 7... etc. until it reaches 19 (since 20 is not a prime number) The only issue is when I run the program 1 keeps on printing out. Here is my method for figuring out whether a number is prime or not. public boolean isPrime(int number) { int prime; for(prime = 2; prime < number; prime++) { if (number % prime == 0)

问题 I am using Spring Boot and Spring Data JPA and Hibernate as the persistence provider. I have extended my Repository interface with JPARepository . I have a list of Entity Bean for a table. Some of them already exist and some of them not. I want to know what will happen when I call saveAll from my service layer and pass this List ? 回答1: If you look at the SimpleJpaRepository which is a common implementation of the CrudRepository you can see that it will simply invoke save for each of the

问题 I'm writing a simple app in Android to print through a ESC/POS thermal printer. I've just a problem. The app generate a QR Code (with zxing library), convert it in a bitmap and send it to the printer. The printer print it, but I'm not able to center it. Instead with text I have no positioning issue. This is the code to print the text and the QR. byte[] INIT = {27, 64}; byte[] FEED_LINE = {10}; byte[] SELECT_FONT_A = {27, 33, 0}; byte[] FONT_B = {0x1B, 0x4D, 0x01}; byte[] ALLINEA_SX = {0x1B,

问题 I'm writing a simple app in Android to print through a ESC/POS thermal printer. I've just a problem. The app generate a QR Code (with zxing library), convert it in a bitmap and send it to the printer. The printer print it, but I'm not able to center it. Instead with text I have no positioning issue. This is the code to print the text and the QR. byte[] INIT = {27, 64}; byte[] FEED_LINE = {10}; byte[] SELECT_FONT_A = {27, 33, 0}; byte[] FONT_B = {0x1B, 0x4D, 0x01}; byte[] ALLINEA_SX = {0x1B,