This question has been asked many times but I couldn't find the answer that fixes my issue. I'm trying to convert nested JSON format to CSV format like this : The JSON structure is arbitrary and could be anything , nested or not. I'm not suppose to know it, it's a database answer and I need to export this JSON answer into CSV file. Here is an example Input : { "_
这个问题已经被问了很多次,但我找不到解决我的问题的答案。 我试图将嵌套的JSON格式转换为CSV格式,如下所示: JSON结构是任意的 , 可以是嵌套或不嵌套的任何东西 。 我不知道它,这是一个数据库答案,我需要将这个JSON答案导出到CSV文件中。 这是一个例子 输入: { "_id": 1, "name": "Aurelia Menendez", "scores": [ { "type": "exam", "score":
I found a scenario where java program behaves differently after renaming a variable. I understand this isn't actually code that anyone would use but if someone knows whats going on it would be nice to have an explanation. I tried this with java 1.6 on Eclipse Kepler. package _test; public class TestClass{ public static void main(String...args){ Object testClazz$1 = new Object
我发现一个Java程序在重命名变量后行为不同的场景。 我知道这不是任何人都会使用的代码,但是如果有人知道发生了什么事情,那么有一个解释是很好的。 我在Eclipse Kepler上用java 1.6尝试了这一点。 package _test; public class TestClass{ public static void main(String...args){ Object testClazz$1 = new Object (){ public String toString() { return "hello";
I've been beating my head against the desk for about an hour now just trying to find some way of getting say... an array of bytes off the clipboard. Instead, all I can seem to find is information on how to get plain text from the clipboard... that's not helpful at all. I've tried following this: Java getting bytes of clipboard I've also tried following this: http://mrbool.com
我一直在桌子上敲打我的头大约一个小时,只是试图找到某种方式说出来......从剪贴板中取出一些字节。 相反,我所能找到的所有信息都是关于如何从剪贴板获取纯文本的信息......这根本没有帮助。 我试过以下这些:Java获取剪贴板的字节 我也试过以下这个:http://mrbool.com/manipulating-clipboard-content-with-java/24758 每次遇到“不受支持”的愚蠢DataFlavor时。 当然,这只是简单的,我错过了这里...我的意思是...它
My web applications security is handled by Spring Security 3.02 but I can't find any out of the box support for Brute Force Detection. I would like to implement some application level BFD protection. For example by storing failed login attempt per user in the database (JPA). The attacked user accounts could then get a lockout period or a forced account re-activation by e-mail. What'
我的Web应用程序安全性由Spring Security 3.02处理,但我找不到任何对Brute Force Detection的支持。 我想实现一些应用级别的BFD保护。 例如,通过将每个用户的失败登录尝试存储在数据库(JPA)中。 受攻击的用户帐户可能会因此通过电子邮件获取锁定期或重新激活帐户。 Spring Security实现这个最好的方法是什么? 任何机构是否都有示例代码或最佳实践? 推出自己的BFD并不难。 正如在Spring Security 3.0中,您可以简
I am working on a system that has been hashing user passwords with MD5 (no salt). I want to store the passwords more securely using SHA-512 and a salt. While this is easy enough to implement for future passwords, I'd like to also retrofit the existing MD5 hashed passwords, preferably without forcing all the users to change their passwords. My idea is to just use SHA-512 and and an appropr
我正在研究一个使用MD5(无盐)散列用户密码的系统。 我想使用SHA-512和盐更安全地存储密码。 虽然这很容易实现未来的密码,但我还想改进现有的MD5散列密码,最好不要强迫所有用户更改其密码。 我的想法是只使用SHA-512和适当的盐来散列现有的MD5散列。 然后,我可以在数据库中设置一些标志,指明哪些密码是从纯文本进行散列的,哪些是从MD5哈希散列的。 或者我可以在验证用户时尝试这两种方法。 甚至可以用MD5和SHA-512
有什么方法可以在Java中生成一个字符串的MD5哈希? java.security.MessageDigest is your friend. Call getInstance("MD5") to get an MD5 message digest you can use. The MessageDigest class can provide you with an instance of the MD5 digest. When working with strings and the crypto classes be sure to always specify the encoding you want the byte representation in. If you just use string.ge
有什么方法可以在Java中生成一个字符串的MD5哈希? java.security.MessageDigest是你的朋友。 调用getInstance("MD5")以获取您可以使用的MD5消息摘要。 MessageDigest类可以为您提供MD5摘要的一个实例。 当操作字符串和加密类一定要始终指定要在字节表示的编码。如果你只使用string.getBytes()将使用平台默认。 (并非所有平台都使用相同的默认值) import java.security.*; .. byte[] bytesOfMessage = yourS
I am using a LinkedBlockingQueue together with the producer/consumer pattern to buffer tasks. To add tasks to the queue I use the method for my producers: Queue.put(Object); To take a task form my queue I use for my consumers: Queue.take(Object); I found in the Java api that both these methods will block until they the queue becomes available. My problem is: I know for a fact that there are
我正在使用LinkedBlockingQueue和生产者/消费者模式一起来缓冲任务。 将任务添加到队列中我使用了我的生产者的方法:Queue.put(Object); 为我的消费者使用队列中的任务:Queue.take(Object); 我在Java API中发现,这两种方法都会阻塞,直到队列变为可用。 我的问题是:我知道有一个事实,即我的系统中有更多的生产者,然后是消费者。 我所有的任务都需要处理。 所以我需要我的消费者在被阻止时优先于生产者获得队列。
This question already has an answer here: Double vs double in java [duplicate] 7 answers Difference between decimal, float and double in .NET? 17 answers Double is an object and double is a primitive data type. See this answer for more details. The Double class wraps a value of the primitive type double in an object. An object of type Double contains a single field whose type is double
这个问题在这里已经有了答案: 在java中双vs双[复制] 7回答 .NET中decimal,float和double的区别? 17个答案 Double是一个对象, double是一个原始数据类型。 看到这个答案更多细节。 Double类在对象中包装基本类型double的值。 Double类型的对象包含一个类型为double的单个字段。 资料来源:http://docs.oracle.com/javase/7/docs/api/java/lang/Double.html
在创建二维数组时,如何记住是否首先指定行或列? Java is considered "row major", meaning that it does rows first. This is because a 2D array is an "array of arrays". For example: int[ ][ ] a = new int[2][4]; // Two rows and four columns. a[0][0] a[0][1] a[0][2] a[0][3] a[1][0] a[1][1] a[1][2] a[1][3] It can also be visualized more like this: a[0] -> [0] [1] [2] [3]
在创建二维数组时,如何记住是否首先指定行或列? Java被认为是“主要行”,这意味着它首先执行行。 这是因为二维数组是一个“数组数组”。 例如: int[ ][ ] a = new int[2][4]; // Two rows and four columns. a[0][0] a[0][1] a[0][2] a[0][3] a[1][0] a[1][1] a[1][2] a[1][3] 它也可以更形象化: a[0] -> [0] [1] [2] [3] a[1] -> [0] [1] [2] [3] 第二个插图显示了“阵列数组”方面。 第一个数组包含{a[0] an
I wonder is there a way to get all private fields of some class in java and their type. For example lets suppose I have a class class SomeClass { private String aaa; private SomeOtherClass bbb; private double ccc; } Now I would like to get all private fields ( aaa , bbb , ccc ) of class SomeClass (Without knowing name of all fields upfront) and check their type. It is possible t
我想知道是否有办法在java中获得某些类的所有私有字段及其类型。 例如让我们假设我有一个班级 class SomeClass { private String aaa; private SomeOtherClass bbb; private double ccc; } 现在我想获得SomeClass类的所有私有字段( aaa , bbb , ccc )(不知道所有字段的名称)并检查它们的类型。 可以使用Class getDeclaredFields()方法获取所有字段。 然后你必须检查每个字段的修饰符以找到私人的字段: