使用Java8 提供的新API读取文件内容,代码简洁、方便。
1、测试代码
import java.io.IOException;
import java.nio.charset.Charset;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.Stream;
/** * Java8 新API读取文件内容 * * Created by wangyingjie1 on 2017/2/22. */
public class ReadFile {
public static void main(String[] args) {
try {
String fileName = "D:\\SrcCode\\Java8InAction\\src\\main\\resources\\lambdasinaction\\chap5\\data.txt";
//读取文件
Stream<String> stringStream = Files
.lines(Paths.get(fileName), Charset.defaultCharset())
.flatMap(line -> Arrays.stream(line.split(" ")));
List<String> words = stringStream.collect(Collectors.toList());
System.out.println("words===>" + words);
List<String> lineLists = Files
.lines(Paths.get(fileName), Charset.defaultCharset())
.flatMap(line -> Arrays.stream(line.split("\n")))
.collect(Collectors.toList());
//输出文件函数
System.out.println("lineLists====" + lineLists.size());
//输出每一行文件内容
lineLists.stream().forEach(System.out::println);
//统计单词的个数
long uniqueWords = Files.lines(Paths.get(fileName), Charset.defaultCharset())
.flatMap(line -> Arrays.stream(line.split(" ")))
.distinct()
.count();
System.out.println("There are " + uniqueWords + " unique words in data.txt");
} catch (IOException e) {
e.printStackTrace();
}
}
}
2、文件data.txt
The quick brown fox jumped over the lazy dog
The lazy dog jumped over the quick brown fox