Java - 多个输入文件
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Java - multiple input files
提问by Ali Ismayilov
How does one read multiple input files in Java? I need to read multiple inputs (several text documents) and create a Term Document Matrix.
I can read one file like this:
如何在 Java 中读取多个输入文件？我需要阅读多个输入（几个文本文档）并创建一个术语文档矩阵。
我可以像这样读取一个文件：
File file = new File("a.txt");
int ch;
StringBuffer strContent = new StringBuffer("");
FileInputStream stream = null;
try
{
stream = new FileInputStream(file);
while( (ch = stream.read()) != -1)
strContent.append((char)ch);
stream.close();
}
Is there any library to read multiple input files? Or I just need to loop and read all files? All files are txt.
是否有任何库可以读取多个输入文件？或者我只需要循环读取所有文件？所有文件都是txt.
回答by Stephen C
Is there any library to read multiple input files?
是否有任何库可以读取多个输入文件？
AFAIK, no.
AFAIK，没有。
Here is your code adapted to read multiple files into the strContentbuffer.
这是您的代码，适用于将多个文件读入strContent缓冲区。
String names = new String[]{"a.txt", "b.txt", "c.txt"};
StringBuffer strContent = new StringBuffer("");
for (String name : names) {
File file = new File(name);
int ch;
FileInputStream stream = null;
try {
stream = new FileInputStream(file);
while( (ch = stream.read()) != -1) {
strContent.append((char) ch);
}
} finally {
stream.close();
}
}
Note that I've moved the closecall into a finallyblock so that you don't leak file descriptors if there is a problem reading the stream. The main changes are to simply put your code into a loop, and tweak the order of a couple of the statements.
请注意，我已将close调用移动到一个finally块中，以便在读取流时出现问题时不会泄漏文件描述符。主要的变化是简单地将您的代码放入一个循环中，并调整几个语句的顺序。
回答by Yogendra Singh
You can use File Stream classes to read your files in loop for example, you can use FileReader/BufferredFileReader as below:
例如，您可以使用 File Stream 类在循环中读取您的文件，您可以使用 FileReader/BufferredFileReader 如下：
String[] fileNames = new String[]{ "fileNameWithPath1", "fileNameWithPath2"...};
for(String fileName: fileNames ) {
BufferredFileReader reader =
new BufferredFileReader(new FileReader(fileName));
System.ount.println("Start reading file : "+fileName);
String line = null;
while((line=reader.nextLine())!= null){
System.out.println(line);
}
reader.close();
System.ount.println("End reading file : "+fileName);
}
If you want to read all files in directory, you want to use:
如果要读取目录中的所有文件，则要使用：
File directory = new File("directoryName");
File[] filesInDir = directory.listFiles();//list all files in directory
for(File file: filesInDir) {
if(!file.isDirectory()){ //read the file if not directory
BufferredFileReader reader =
new BufferredFileReader(new FileReader(file));
System.ount.println("Start reading file : "+fileName);
String line = null;
while((line=reader.nextLine())!= null){
System.out.println(line);
}
reader.close();
System.ount.println("End reading file : "+fileName);
}
}
