Update Log4j Appender at runtime
Categories: Java; Tagged with: Java • Log4j; @ April 17th, 2013 18:20
import java.io.IOException;
import org.apache.log4j.FileAppender;
import org.apache.log4j.Logger;
import org.apache.log4j.PatternLayout;
/**
* Test for adding appender to log4j at runtime.
* @author SGSCLGLD
*
*/
public class LogingTest {
static Logger log = Logger.getLogger(LogingTest.class);
public static void main(String[] args) throws IOException {
// setting up a FileAppender at runtime.
PatternLayout patternLayout = new PatternLayout();
patternLayout.setConversionPattern("[%d{d/M/yyyy HH:mm:ss}] %p [%t] %c{1}.%M(%L) | %m%n");
FileAppender appender = new FileAppender(patternLayout,"D:\\ME\\WS_Share\\test1\\log.txt",false);
log.addAppender(appender);
log.info("Hello world...");
}
}
Java RSA Key Generation/Encryption/Decryption RSA秘钥生成/加密/解密
Categories: Java; Tagged with: Java • Java Security • Security; @ April 3rd, 2013 0:17Requirement:
Generate RSA key pair using Java, and test encryption/decryption.
Source code:
package com.rsa;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.PrivateKey;
import java.security.PublicKey;
import javax.crypto.Cipher;
public class RSATest {
/**
* Generate key pair and encrypt/decrypt message.
* @param args
* @throws Throwable
*/
public static void main(String[] args) throws Throwable {
String str = "liguoliang.com";
// init private/public key
KeyPairGenerator keyGen = KeyPairGenerator.getInstance("RSA");
keyGen.initialize(512);
KeyPair keyPair = keyGen.generateKeyPair();
PrivateKey privateKey = keyPair.getPrivate();
PublicKey publicKey = keyPair.getPublic();
System.out.println("privateKey: " + privateKey);
System.out.println("PublicKey: " + publicKey);
System.out.println("Original message: [" + str + "]");
// init cipher
Cipher cipher;
cipher = Cipher.getInstance("RSA");
// Encrypt
cipher.init(Cipher.ENCRYPT_MODE, publicKey);
byte[] encryptedMsg = cipher.doFinal(str.getBytes());
System.out.println("Encrypted message: [" + new String(encryptedMsg) + "]");
// Decrypt
cipher.init(Cipher.DECRYPT_MODE, privateKey);
byte[] decryptedMsg = cipher.doFinal(encryptedMsg);
System.out.println("Decrypted message: [" + new String(decryptedMsg) + "]");
}
}
Output:
privateKey: Sun RSA private CRT key, 512 bits
modulus: 6722431852833652083740039
public exponent: 65537
private exponent: 171186757391917267536..695551529001
prime p: 9879891158983359366387147661330…7700131643
prime q: 680415577930859..89085598145526159671701009583973
prime exponent p: 320741816528876..9797652301875289
prime exponent q: 1025757344699..140192255455019921532401
crt coefficient: 60972956628933..8290909983925983303
PublicKey: Sun RSA public key, 512 bits
modulus: 672243185283365208374001..
public exponent: 65537
Original message: [liguoliang.com]
Encrypted message: ['ËŸò¬Œ÷Já°`ð«6L´aZ0Ž¶¹mçZaÐvCóG%P ƒtÂÌÖ9ØùýY,vÎ`¦Y»ù h]
Decrypted message: [liguoliang.com]
Reference
RSA Encryption in Java – http://tspycher.com/2012/10/rsa-encryption-in-java/
用实例给新手讲解RSA加密算法 – http://bank.hexun.com/2009-06-24/118958531.html
http://introcs.cs.princeton.edu/java/78crypto/RSA.java.html
Java Socket Example
Categories: Java; Tagged with: Java • Socket; @ April 2nd, 2013 0:43Requirement: Client send message to Server, Server get the message and return to Client.
Codes:
MesgServer:
package com.socket;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
import com.common.LogHelper;
/**
* ServerSide: receive message from Client and return it.
* @author Guoliang
*
*/
public class MesgServer implements Runnable{
public void run() {
LogHelper.log("ServerStarted");
try {
ServerSocket serverSocket = new ServerSocket(8888);
while (true) {
Socket socket = serverSocket.accept();
LogHelper.log("Request: " + socket.toString());
BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
PrintWriter out = new PrintWriter(socket.getOutputStream());
out.println("Connected!");
out.flush();
String lineInput;
while ((lineInput = in.readLine()) != null) {
LogHelper.log("GotMesgFromClient: " + lineInput);
out.println("ServerReturnMsg: " + lineInput);
out.flush();
if("exit".equals(lineInput)) {
break;
}
}
out.close();
in.close();
socket.close();
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
MesgClient
package com.socket;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;
import java.net.UnknownHostException;
import com.common.LogHelper;
public class MesgClient {
/**
* Send mesg to server side.
* @param args
* @throws IOException
* @throws UnknownHostException
*/
public static void main(String[] args) throws UnknownHostException, IOException {
// Start server.
new Thread(new MesgServer()).start();
Socket socket = new Socket("localhost", 8888);
LogHelper.log("Connecting...");
PrintWriter out = new PrintWriter(socket.getOutputStream(), true);
BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
LogHelper.log(in.readLine());
// Simplest testing
out.println("Hello!");
LogHelper.log(in.readLine());
// Read user input.
BufferedReader stdIn = new BufferedReader(new InputStreamReader(System.in));
String strInput = null;
while ((strInput = stdIn.readLine()) != null) {
out.println(strInput);
LogHelper.log("Send: " + strInput);
LogHelper.log(in.readLine());
}
}
}
Output:
[Thread-0]ServerStarted
[main]Connecting...
[Thread-0]Request: Socket[addr=/127.0.0.1,port=5569,localport=8888]
[main]Connected!
[Thread-0]GotMesgFromClient: Hello!
[main]ServerReturnMsg: Hello!
liguoliang.com // user input.
[Thread-0]GotMesgFromClient: liguoliang.com
[main]Send: liguoliang.com
[main]ServerReturnMsg: liguoliang.com
Axis2: IWAB0489E Error when deploying Web service to Axis runtime
Categories: Java; Tagged with: Apache • Axis • Java • WebService; @ February 27th, 2013 19:28I try to get started with Axis2, but when I try to create Web Service in Eclipse, I got the following Error:
IWAB0489E Error when deploying Web service to Axis runtime
After googling, I got the solution:
Make sure the config of web service Server and Runtime is correct:
正则表达式：根据逗号解析CSV并忽略引号内的逗号 splitting a comma-separated string but ignoring commas in quotes
Categories: Java; Tagged with: CSV • Java • RegEx; @ January 30th, 2013 16:04需求：解析CSV文件并忽略引号内的逗号
解决方案：
public static void main(String[] args) {
String s = "a,b,c,\"1,000\"";
String[] result = s.split(",(?=([^\"]*\"[^\"]*\")*[^\"]*$)");
for (String str : result) {
System.out.println(str);
}
}
输出：
a
b
c
“1,000”