用途：FileUtil 文件工具类(读取文件)

使用场景

读取文件内容的各种骚操作

项目引用

此博文的依据：hutool-5.6.5版本源码

方法明细

方法名称:cn.hutool.core.io.FileUtil.readBytes(java.io.File)

方法描述

读取文件所有数据<br>

文件的长度不能超过Integer.MAX_VALUE

支持版本及以上

参数描述: 参考案例:

    String path = "C:\\Users\\Administrator\\Desktop\\xuzhu/copyTest1.txt";
    //从文件中读取每一行的UTF-8编码数据
    ArrayList<String> readUtf8Lines = FileUtil.readLines(new File(path),CharsetUtil.CHARSET_UTF_8, new ArrayList<>());
    for(String readUtf8Line :readUtf8Lines){
      System.out.println(readUtf8Line);
    }

public class FileUtilReaderHandler implements FileReader.ReaderHandler {
  @Override
  public Object handle(BufferedReader reader) throws IOException {
    System.out.println("FileUtilReaderHandler:start");
    String str = null;
    List<String> stringList = new ArrayList<>();
    //到达流末尾, 就返回null
    while((str = reader.readLine()) != null){
      System.out.println(str);
      stringList.add(str);
    }
    return stringList;
  }
}
//------------------------
    String path = "C:\\Users\\Administrator\\Desktop\\xuzhu/copyTest1.txt";
    List<String> list = (List<String>) FileUtil.load(path,CharsetUtil.CHARSET_UTF_8,new FileUtilReaderHandler());
    for(String str :list){
      System.out.println("loadUtf8Test:"+str);
    }

public class FileUtilReaderHandler implements FileReader.ReaderHandler {
  @Override
  public Object handle(BufferedReader reader) throws IOException {
    System.out.println("FileUtilReaderHandler:start");
    String str = null;
    List<String> stringList = new ArrayList<>();
    //到达流末尾, 就返回null
    while((str = reader.readLine()) != null){
      System.out.println(str);
      stringList.add(str);
    }
    return stringList;
  }
}
//------------------------
    String path = "C:\\Users\\Administrator\\Desktop\\xuzhu/copyTest1.txt";
    List<String> list = (List<String>) FileUtil.load(new File(path),CharsetUtil.CHARSET_UTF_8,new FileUtilReaderHandler());
    for(String str :list){
      System.out.println("loadUtf8Test:"+str);
    }