android nio ssl
Java nio非堵塞应用通常适用用在I/O读写等方面，我们知道，系统运行的性能瓶颈通常在I/O读写，包括对端口 和文件的操作上，过去，在打开一个I/O通道后，read()将一直等待在端口一边读取字节内容，如果没有内容进来，read()也是傻傻的等，这会影响 我们程序继续做其他事情，那么改进做法就是开设线程，让线程去等待，但是这样做也是相当耗费资源的。 Java nio非堵塞技术实际是采取Reactor模式，或者说是Observer...
来自两所德国大学的研究团队最近发布一项研究声称，在Google Play Store提供的最流行的免费app应用程序中，许多都可能带有导致man-in-the-middle(MITM)攻击的漏洞，这将严重威胁到用户隐私。 来自汉诺威和马尔堡大学的专家们对Play store 中13500个最流行的免费软件进行了ssl和TLS漏洞研究。他们发现，1074个app程序包含ssl特定代码，这些代码要么接受所有认证，要么接受所有认证主机名，由此成为潜在MITM攻击的漏洞...
Open Handset Alliance android ssl证书欺骗漏洞 发布日期：2011-07-29 更新日期：2011-07-29 受影响系统： Open Handset Alliance Open Handset Alliance android 2.1 Open Handset Alliance Open Handset Alliance android 2.0.1 Open Handset Alliance Open Handset Alliance android 1.5 Open Handset Alliance Open Handset Alliance android 1.0 不受影响系统： Open Handset Alliance Open Handset Alliance android 2.2...
A Java nio FileChannel is a channel that is connected to a file. Using a file channel you can read data from a file, and write data to a file. A FileChannel cannot be set into non-blocking mode. It always runs in blocking mode. Opening a FileChannel Before you can use a FileChannel you must open it. You cannot open a FileChannel directly. You need to obtain a FileChannel via an InputStream, Ou...
A Selector is a Java nio component which can examine one or more nio Channel's, and determine which channels are ready for e.g. reading or writing. This way a single thread can manage multiple channels, and thus multiple network connections. Here is a list of the topics covered in this text: Why Use a Selector? Creating a Selector Registering Channels with a Selector SelectionKey's Selecting Cha...
Java nio comes with built-in scatter / gather support. Scatter / gather are concepts used in reading from, and writing to channels. A scattering read from a channel is a read operation that reads data into more than one buffer. Thus, the channel "scatters" the data from the channel into multiple buffers. A gathering write to a channel is a write operation that writes data from more than one buff...
Java nio Buffers are used when interacting with nio Channels. As you know, data is read from channels into buffers, and written from buffers into channels. A buffer is essentially a block of memory into which you can write data, which you can then later read again. This memory block is wrapped in a nio Buffer object, which provides a set of methods that makes it easier to work with the memory blo...
Java nio Channels are similar to streams with a few differences: You can both read and write to a Channels. Streams are typically one-way (read or write). Channels can be read and written asynchronously. Channels always read to, or write from, a Buffer. As mentioned above, you read data from a channel into a buffer, and write data from a buffer into a channel. Here is an illustration of that: J...
Java nio consist of the following core components: Channels Buffers Selectors Java nio has more classes and components than these, but the Channel, Buffer and Selector forms the core of the API, in my opinion. The rest of the components, like Pipe and FileLock are merely utility classes to be used in conjunction with the three core components. Therefore, I'll focus on these three components in th...
nio学习总结 Java代码[code]1./** 2. * 使用传统的I/O读取文件内容 3. * @param filePath 文件路径 4. * @throws IOException 5.*/ 6. public static void ioRead(String filePath) throws IOException { 7. File file = new File(filePath); 8. FileInputStream fis = new FileInputStream(file); 9. byte[] b = new byte[1024]; 10. fis.read(b); 11. ...
