java中如何实现文件的读入与读出

Java  /  管理员 发布于 8年前   257

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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