java读取文本文件的方法有很多
这个例子主要介绍最简单
最常用的BufferedReader类
完整例子如下
package netchinaunixbloghzmtext;
import javaioBufferedReader;
import javaioFileReader;
import javaioIOException;
public class ReadFile {
private String path;
public ReadFile（String filePath）{
path = filePath;
}
public String[] openFile（） throws IOException{
FileReader fr = new FileReader（path）
BufferedReader textReader = new BufferedReader（fr）
String[] textData = new String[readLines（）];
int i;
for（i=; i < readLines（）i++）{
textData[i] = textReaderreadLine（）
}
textReaderclose（）
return textData;
}
int readLines（） throws IOException{
FileReader fileToRead = new FileReader（path）
BufferedReader bf = new BufferedReader（fileToRead）
int numberOfLines = ;
@SuppressWarnings（unused）
String oneLine;
while（（oneLine = bfreadLine（）） != null）{
numberOfLines++;
}
bfclose（）
return numberOfLines;
}
}
package netchinaunixbloghzmtext;
import javaioIOException;
public class FileData {
public static void main（String[] args） throws IOException{
String filePath = C:/texttxt;
try{
ReadFile reader = new ReadFile（filePath）
String[] content = readeropenFile（）
int i;
for（i=;i<contentlength;i++）{
Systemoutprintln（content[i]）
}
}catch（IOException e）{
Systemoutprintln（异常信息 + egetMessage（））
}
}
}
javaioBufferedReader
The buffer size may be specified or the default size may be used The default is large enough for most purposes
In general each read request made of a Reader causes a corresponding read request to be made of the underlying character or byte stream It is therefore advisable to wrap a BufferedReader around any Reader whose read（） operations may be costly such as FileReaders and InputStreamReaders For example
BufferedReader in = new BufferedReader（new FileReader（fooin）） will buffer the input from the specified file Without buffering each invocation of read（） or readLine（） could cause bytes to be read from the file converted into characters and then returned which can be very inefficient
Programs that use DataInputStreams for textual input can be localized by replacing each DataInputStream with an appropriate BufferedReader
javaioFileReader
FileReader is meant for reading streams of characters For reading streams of raw bytes consider using a FileInputStream
