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使用多个线程在单个文件中写入

[英]Using Multiple Threads to write in single file

原文 2011-11-23 07:39:48 5 1 java/ io/ random-access

Can i use multiple threads to write in RandomAccessFile in Java ? 我可以使用多个线程在Java中的RandomAccessFile中编写吗？

I know RandomAccessFiles allows to read & write at any position. 我知道RandomAccessFiles允许在任何位置读写。

I want to create n portions of above File and let each thread to write contents in a particular portion. 我想创建上面文件的n部分，让每个线程在特定部分写入内容。

will it improve IO performance? 会改善IO性能吗？

Eager to hear soon...... 渴望尽快听到……

1 个解决方案

You can open the file twice with the proper sharing specified, having two RandomAccessFile objects pointing to the same file. 您可以使用指定的正确共享打开文件两次，使两个RandomAccessFile对象指向同一文件。 The OS will manage properly if you're careful not to write and read the same location twice (the OS will handle it then, too, but you'll get unexpected results). 如果小心不要重复读写同一位置两次，则操作系统将正常管理（操作系统也将处理该位置，但会得到意想不到的结果）。

However, it will not improve your I/O performance - CPU is almost never the bottleneck when it comes to I/O. 但是，它不会提高您的I / O性能-CPU几乎从来都不是I / O的瓶颈。 What is it you're trying to achieve? 你想要达到的目标是什么？

如何使多个线程使用预定义的部分（按行号）写入单个文件？ - How to make multiple threads write to a single file, with predefined sections(by line numbers)?

从多个线程以随机顺序写入文件 - Write to file in random order from multiple threads

如何从多个线程写入文件 - How to write in file from multiple threads

从Java中的多个线程写入Excel文件 - Write to an excel file from multiple threads in Java

Java用单线程和多线程读取文件 - Java Reading a file with single and multiple threads

为单个进程共同使用多个线程 - Using multiple threads for a single process collectively

使用多线程写入文件 - Writing a file using multiple threads

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使用多个线程将数据写入文本文件（同时，在不同的文件行中） - Write data into text file with multiple threads (simultaneously, in different lines of file)

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相关问题 如何使多个线程使用预定义的部分（按行号）写入单个文件？ - How to make multiple threads write to a single file, with predefined sections(by line numbers)? 从多个线程以随机顺序写入文件 - Write to file in random order from multiple threads 如何从多个线程写入文件 - How to write in file from multiple threads 从Java中的多个线程写入Excel文件 - Write to an excel file from multiple threads in Java Java用单线程和多线程读取文件 - Java Reading a file with single and multiple threads 为单个进程共同使用多个线程 - Using multiple threads for a single process collectively 使用多线程写入文件 - Writing a file using multiple threads 如果多个线程写入单个映射，则使用哪种映射实现 - Which map implementation to use if multiple threads write to a single map 使用多个线程将数据写入文本文件（同时，在不同的文件行中） - Write data into text file with multiple threads (simultaneously, in different lines of file) 用JAVA写多线程 - Write Multiple Threads in JAVA

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