作者:榴莲牛奶 | 来源:互联网 | 2022-04-22 07:08
本文由java快速入门栏目为大家推荐,文中通过实例为大家演示了如何实现文件的读入与读出,希望可以为大家做个参考。在java中可以通过构造一个BufferedReader类来读取文件。
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 TxtToStringList(File file) {
List 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 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 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 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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