java代码--如何从文件内容创建Java字符串呢?

文件内容创建字符串的实现思路

方式1:
    借助BufferedReadr读取file对象，
      然后将读取的字节信息转换为字符串
方式2:
    使用Files.readString方法读取指定路径下的文件内容
	    并转换为字符串输出返回
方式3:
    借助Files.readAllBytes
	   或
	  Files.readAllLine方法读取文件信息

private String readFile(String file) throws IOException {
    BufferedReader reader = new BufferedReader(new FileReader (file));
    String         line = null;
    StringBuilder  stringBuilder = new StringBuilder();
    String         ls = System.getProperty("line.separator");

    try {
        while((line = reader.readLine()) != null) {
            stringBuilder.append(line);
            stringBuilder.append(ls);
        }

        return stringBuilder.toString();
    } finally {
        reader.close();
    }
}

Java 11中readString()方法的示例

String content = Files.readString(path, encoding);

readAllLines或readAllBytes

list<String> lines = Files.readAllLines(Paths.get(path), encoding);

Files.lines()方法

try (Stream<String> lines = Files.lines(path, encoding)) {
  lines.forEach(System.out::println);
}