在执行报告时,如何在iReport中计算SHA1或MD5哈希?我需要将预先计算的哈希与数据库驱动的字段(字符串)进行比较.
How would one calculate an SHA1 or MD5 hash within iReport at report execution? I need to compare a pre-calculated hash against a database driven field (string).
使用iReport 2.0.5(旧版),并将Report Engine嵌入到商业应用程序中.
Using iReport 2.0.5 (Old) and Report Engine is embedded into a commercial application.
推荐答案几年前,我使用了iReport和Jasper Reports,但我不记得详细信息,但我记得您可以通过某种方式放置要评估的Java代码. .使用该功能,您可以在几行中计算MD5:
I used iReport and Jasper Reports some years ago and I don't remember the details, but I remember that you could put in some way Java code to be evaluated. Using that feature you could calculate the MD5 in few lines:
String encryptionAlgorithm = "MD5"; String valueToEncrypt = "StackOverflow"; MessageDigest msgDgst = MessageDigest.getInstance(encryptionAlgorithm); msgDgst.update(valueToEncrypt.getBytes(), 0, valueToEncrypt.length()); String md5 = new BigInteger(1, msgDgst.digest()).toString(16) ; System.out.println(md5);需要导入java.math.BigInteger,java.security.MessageDigest和java.security.NoSuchAlgorithmException;
Need to import java.math.BigInteger, java.security.MessageDigest and java.security.NoSuchAlgorithmException;
要计算SHA1哈希值几乎是相同的:
To calculate SHA1 hash is almost the same:
String encryptionAlgorithm = "SHA-1"; String valueToEncrypt = "StackOverflow"; MessageDigest msgDgst = MessageDigest.getInstance(encryptionAlgorithm); byte[] sha1hash = new byte[40]; msgDgst.update(valueToEncrypt.getBytes(), 0, valueToEncrypt.length()); sha1hash = md.digest();查看此博客文章,了解可以在报表运行时评估的变量 www.eakes/77/java-injection-in-jasper-reports/
Check this blog post about the creation of variables that can be evaluated at report run time www.eakes/77/java-injection-in-jasper-reports/
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在iReport中计算SHA1或MD5哈希
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