java.lang.NoClassDefFoundError：org / apache / commons / codec / binary / Base64 [英] java.lang.NoClassDefFoundError: org/apache/commons/codec/binary/Base64
问题描述
管理员请不要将其标记为重复阅读我的问题。我在加密和解密一些文本，但运行在同一个文件主要运行正常，但当我从外部调用其加密和解密功能。它在运行时发出错误。我附上代码
package desede;
Admin please don't mark it as duplicate read my question completely. I am encrypting and decrypting some text but while running in same file with main its running fine but when i call its encrypt and decrypt function from outside. Its giving an error at runtime. I am attaching the code. package desede;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
import org.apache.commons.codec.binary.Base64;
import security.SHA256Algo;
import shradhafinalwiddesign.UpdateFile;
import shradhafinalwiddesign.UserRegistration;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
/**
* Simple TripleDES Encrypt/Decrypt Test
* sha1, utf-8, no padding
*
* uses commons-codec-1.6
* javac -cp :commons-codec-1.6.jar TripleDESTest.java
* java -cp :commons-codec-1.6.jar TripleDESTest
*/
public class TripleDesDemo {
public static void main(String[] args) throws Exception {
String text = "textToEncrypt";
UserRegistration user = new UserRegistration() ;
user.setlUsername("tarunv") ;
user.setAnswer("tommysdsfdsfsd") ;
user.setLastaccess("pets namesdfsfds") ;
user.setLpassword("computersdfdsfd") ;
String h1 = SHA256Algo.createHash(user.getlUsername()) ;
String h2 = SHA256Algo.createHash(user.getLpassword()) ;
String h3 = SHA256Algo.createHash(user.getAnswer()) ;
String hash1 = UpdateFile.modifyHashValue(h1).substring(0, 24) ;
String hash2 = UpdateFile.modifyHashValue(h2) ;
String hash3 = UpdateFile.modifyHashValue(h3) ;
System.out.println(" key1 : "+hash1.length()+" key2 : "+hash2.length()+" key3 : "+hash3.length());
byte[] arr = toByteArray(user) ;
byte[] codedtext = TripleDesDemo._encrypt(arr,"tarunvermacdac@gmail.com");
byte[] codedtext1 = TripleDesDemo._encrypt(codedtext,"tarun.spicyabc@gmail.com");
byte[] codedtext2 = TripleDesDemo._encrypt(codedtext1,"direct_tarun@yahoo.co.in");
writeSmallBinaryFile(codedtext2, "tarun.bat") ;
byte[] texttoDecrypt = readSmallBinaryFile("tarun.bat");
byte[] decodedtext = TripleDesDemo._decrypt(texttoDecrypt,"direct_tarun@yahoo.co.in");
byte[] decodedtext1 = TripleDesDemo._decrypt(decodedtext,"tarun.spicyabc@gmail.com");
byte[] decodedtext2 = TripleDesDemo._decrypt(decodedtext1,"tarunvermacdac@gmail.com");
System.out.println(codedtext + " ---> " + toObject(decodedtext2));
}
public static byte[] _encrypt(byte[] plainTextBytes, String secretKey) throws Exception {
byte[] keyBytes = secretKey.getBytes();
SecretKey key = new SecretKeySpec(keyBytes, "DESede");
Cipher cipher = Cipher.getInstance("DESede");
cipher.init(Cipher.ENCRYPT_MODE, key);
//byte[] plainTextBytes = message.getBytes("utf-8");
byte[] buf = cipher.doFinal(plainTextBytes);
byte [] base64Bytes = Base64.encodeBase64(buf);
//String base64EncryptedString = new String(base64Bytes);
return base64Bytes ;
}
public static byte[] _decrypt(byte[] encryptedText, String secretKey) throws Exception {
//byte[] message = Base64.decodeBase64(encryptedText);
byte[] message = Base64.decodeBase64(encryptedText);
byte[] keyBytes = secretKey.getBytes();
SecretKey key = new SecretKeySpec(keyBytes, "DESede");
Cipher decipher = Cipher.getInstance("DESede");
decipher.init(Cipher.DECRYPT_MODE, key);
byte[] plainText = decipher.doFinal(message);
return plainText ;
//return toObject(plainText);
}
public static byte[] toByteArray(UserRegistration obj) throws IOException {
byte[] bytes = null;
ByteArrayOutputStream bos = null;
ObjectOutputStream oos = null;
try {
bos = new ByteArrayOutputStream();
oos = new ObjectOutputStream(bos);
oos.writeObject(obj);
oos.flush();
bytes = bos.toByteArray();
} finally {
if (oos != null) {
oos.close();
}
if (bos != null) {
bos.close();
}
}
return bytes;
}
public static UserRegistration toObject(byte[] bytes) throws IOException, ClassNotFoundException {
UserRegistration obj = null;
ByteArrayInputStream bis = null;
ObjectInputStream ois = null;
try {
bis = new ByteArrayInputStream(bytes);
ois = new ObjectInputStream(bis);
obj = (UserRegistration) ois.readObject();
} finally {
if (bis != null) {
bis.close();
}
if (ois != null) {
ois.close();
}
}
return obj;
}
public static byte[] readSmallBinaryFile(String aFileName) throws IOException {
Path path = Paths.get(aFileName);
return Files.readAllBytes(path);
}
public static void writeSmallBinaryFile(byte[] aBytes, String aFileName) throws IOException {
Path path = Paths.get(aFileName);
Files.write(path, aBytes); //creates, overwrites
}
}
代码正常运行主要但不是当我从其他类的其他包中调用其功能时。这是例外。
The code is running fine with main but not when i call its function from other class which is in other package. Here is the exception.
Exception in thread "AWT-EventQueue-0" java.lang.NoClassDefFoundError: org/apache/commons/codec/binary/Base64 at desede.TripleDesAlgo._encrypt(TripleDesAlgo.java:81)
这个是.classpath文件
提前感谢任何帮助。
And this is .classpath file Thanks in advance for any help.
推荐答案
你缺少commons-codec.jar。从 http://commons.apache.org/proper/commons-codec/download_codec.cgi。
然后添加它项目构建路径。要做到这一点，单击项目，单击属性，单击Java构建路径，打开库选项卡，然后单击添加外部JAR ...。
You are missing commons-codec.jar. Download it from http://commons.apache.org/proper/commons-codec/download_codec.cgi. Then add it project build path. To do that right click the project, click Properties, click "Java Build Path", open "Library" tab, and click "Add External JARs...".
或者如果您使用maven添加依赖关系
Or if you are using maven add dependency for
<dependency>
<groupId>commons-codec</groupId>
<artifactId>commons-codec</artifactId>
<version>1.6</version>
</dependency>
这篇关于java.lang.NoClassDefFoundError：org / apache / commons / codec / binary / Base64的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
