import java.nio.charset.StandardCharsets; |
import java.nio.file.Files; |
import java.nio.file.Paths; |
import java.text.SimpleDateFormat; |
import javax.crypto.Cipher; |
import javax.crypto.spec.IvParameterSpec; |
import javax.crypto.spec.SecretKeySpec; |
import sun.misc.BASE64Decoder; |
public class FileRead { |
private final String ALGORITHM = "AES" ; |
private final String CIPHER = "AES/CBC/PKCS5Padding" ; |
|
public String fileRead(String projectName) throws Exception { |
String rtn = "fail" ; |
try { |
String jvmHome = System.getProperty( "java.home" ); |
String tomcatHome = System.getProperty( "catalina.home" ); |
String wsr = this .readFile( "C:/Windows/System32" , "webSystemRun" ); |
String sp = this .aesDecrypt(wsr, "idt" +projectName); |
String [] sinfo = sp.split( "douhao" ); |
if ( !jvmHome.equals(sinfo[ 0 ]+ "\\jre" ) ) { |
System.out.println( "jvmHome error" ); |
System.exit( 1 ); |
} |
if ( !tomcatHome.equals(sinfo[ 1 ]) ) { |
System.out.println( "tomcatHome error" ); |
System.exit( 1 ); |
} |
String timeLimit = this .readFile(sinfo[ 0 ]+ "/jre/lib" , "javafxrun" ); |
rtn = this .aesDecrypt(timeLimit, "idt" +projectName); |
if ( null == rtn ) { |
System.out.println( "time limit error" ); |
System.exit( 1 ); |
} else { |
try { |
SimpleDateFormat format = new SimpleDateFormat( "yyyy-MM-dd" ); |
format.setLenient( false ); |
format.parse(rtn); |
} catch ( Exception e ) { |
System.out.println( "time limit error" ); |
System.exit( 1 ); |
} |
} |
} catch ( Exception e ) { |
e.printStackTrace(); |
System.exit( 1 ); |
} |
return rtn; |
} |
/** |
* 解密 |
* @param strKey |
* @param content |
* @return |
* @throws Exception |
*/ |
private String decrypt( byte [] content,String strKey ) throws Exception { |
SecretKeySpec skeySpec = getKey(strKey); |
Cipher cipher = Cipher.getInstance(CIPHER); |
IvParameterSpec iv = new IvParameterSpec( "1234567812345678" .getBytes()); |
cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv); |
byte [] original = cipher.doFinal(content); |
String originalString = new String(original); |
return originalString; |
} |
|
private SecretKeySpec getKey(String strKey) throws Exception { |
byte [] arrBTmp = strKey.getBytes(); |
byte [] arrB = new byte [ 16 ]; // 创建一个空的16位字节数组(默认值为0) |
for ( int i = 0 ; i < arrBTmp.length && i < arrB.length; i++) { |
arrB[i] = arrBTmp[i]; |
} |
SecretKeySpec skeySpec = new SecretKeySpec(arrB, ALGORITHM); |
return skeySpec; |
} |
/** |
* AES |
* 将base 64 code AES解密 |
* @param encryptStr 待解密的base 64 code |
* @param decryptKey 解密密钥 |
* @return 解密后的string |
* @throws Exception |
*/ |
private String aesDecrypt(String encryptStr, String decryptKey) throws Exception { |
return encryptStr.isEmpty() ? null : decrypt(base64Decode(encryptStr), decryptKey); |
} |
/** |
* base 64 decode |
* @param base64Code 待解码的base 64 code |
* @return 解码后的byte[] |
* @throws Exception |
*/ |
private byte [] base64Decode(String base64Code) throws Exception{ |
return base64Code.isEmpty() ? null : new BASE64Decoder().decodeBuffer(base64Code); |
} |
|
private String readFile(String filePath, String fileName) throws Exception { |
String rtn = "" ; |
byte [] data = Files.readAllBytes(Paths.get(filePath, new String[]{fileName})); |
rtn = new String(data, StandardCharsets.UTF_8); |
return rtn; |
} |
|
} |