How to implement reading and reading of files in java
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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