java中如何实现文件的读入与读出

一、文档读取

1、将文件读取为String

public static String TxtToString(File file) {     String result = "";     try {         BufferedReader br = new BufferedReader(new FileReader(file));         //构造一个BufferedReader类来读取文件         String s = null;         while ((s = br.readLine()) != null) {//使用readLine方法，一次读一行             result = result + "\n" + s;         }         br.close();     } catch (Exception e) {         e.printStackTrace();     }     return result; }

2、将文件读取为List集合（按行）（免费视频教程分享：java免费视频教程）

public static List<String> TxtToStringList(File file) {     List<String> result = new ArrayList<>();     try {         if (!file.exists()){             return null;         }         BufferedReader br = new BufferedReader(new FileReader(file));         //构造一个BufferedReader类来读取文件         String s = null;         while ((s = br.readLine()) != null) {//使用readLine方法，一次读一行             result.add(s);         }         br.close();     } catch (Exception e) {         e.printStackTrace();     }     return result; }

二、Java存储文件

1、将list按行写入到txt文件中

public static void writeFileContext(List<String> strings) throws Exception {     File file = new File("D:\\IntellijIDEAProject\\KeChenSheJi\\data\\WordLibrary_index");     //如果没有文件就创建     if (!file.isFile()) {         file.createNewFile();     }     BufferedWriter writer = new BufferedWriter(new FileWriter     ("D:\\IntellijIDEAProject\\KeChenSheJi\\data\\WordLibrary_index"));     for (String l:strings){         writer.write(l + "\r\n");     }     writer.close(); }

2、按照名字将string类型的集合存入文件

public static void writeFileContext_Find(List<String> strings,String name) throws Exception {     File file = new File("D:\\IntellijIDEAProject\\KeChenSheJi\\data\\wordIndex");     //如果没有文件就创建     if (!file.isFile()) {         file.createNewFile();     }     BufferedWriter writer = new BufferedWriter(new FileWriter     ("D:\\IntellijIDEAProject\\KeChenSheJi\\data\\wordIndex\\"+name));     for (String l:strings){         writer.write(l + "\r\n");     }     writer.close();

3、将Sting类型的list集合按文件地址存储

public static void writeFileContext_Found(List<String> strings,String filename) throws Exception {     File file = new File(filename);     //如果没有文件就创建     if (!file.isFile()) {         file.createNewFile();     }     BufferedWriter writer = new BufferedWriter(new FileWriter     ("D:\\IntellijIDEAProject\\KeChenSheJi\\data\\file_index\\"+file.getName()));     for (String l:strings){         writer.write(l + "\r\n");     }     writer.close(); }

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