如何用java按行读取大文件

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通用做法：

try (BufferedReader br = new BufferedReader(new FileReader(file))) { String line; while ((line = br.readLine()) != null) { // process the line. } }

稍微通用一点做法：

try(BufferedReader br = new BufferedReader(new FileReader(file))) { for(String line; (line = br.readLine()) != null; ) { // process the line. } // line is not visible here. }

在java8 中你可以参考如下方式：

try (Stream 
  
    stream = Files.lines(Paths.get(fileName))) { stream.forEach(System.out::println); } 
  

指定编码规则方式如下：

try { BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(filePath), "Cp1252")); String line; while ((line = br.readLine()) != null) { // process the line. } br.close(); } catch (IOException e) { e.printStackTrace(); }