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Files/Paths操作大文本数据的保存、修改、删除、获取

自己在做一个写小说的小系统,考虑到大文本不适合用数据库做持久化,所以写了这个工具来做文本文件形式的存储

util-articleFile.properties里的parent.path就是存储文本文件的目录的绝对路径

package net.add1s.util;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.PropertySource;
import org.springframework.stereotype.Component;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;

/**
 * @author pj.w@qq.com
 */
@Component
@PropertySource(value = "classpath:config/util-articleFile.properties")
public class ArticleFileUtil {

    @Value("${parent.path}")
    private String parentPath;

    public String save(Long id, String data) throws IOException {

        // 构造文件绝对路径
        Path path = Paths.get(parentPath, id + ".txt");
        // 创建文件
        Files.createFile(path);
        // 填充内容
        BufferedWriter bufferedWriter = Files.newBufferedWriter(path, StandardCharsets.UTF_8);
        bufferedWriter.write(data);
        bufferedWriter.flush();
        bufferedWriter.close();
        // 返回保存的绝对路径
        return path.toString();
    }

    public void update(Long id, String data) throws IOException {
        // 获取原存储绝对路径
        Path path = Paths.get(parentPath, id + ".txt");
        // 覆盖原内容
        BufferedWriter bufferedWriter = Files.newBufferedWriter(path, StandardCharsets.UTF_8);
        bufferedWriter.write(data);
        bufferedWriter.flush();
        bufferedWriter.close();
    }

    public boolean delete(Long id) throws IOException {
        // 获取原存储绝对路径
        Path path = Paths.get(parentPath, id + ".txt");
        // 若文件存在就执行删除操作
        return Files.deleteIfExists(path);
    }

    public String get(Long id) throws IOException {
        // 获取目标文件存储绝对路径
        Path path = Paths.get(parentPath, id + ".txt");
        // 读取数据并返回
        String line;
        StringBuilder data = new StringBuilder();
        BufferedReader bufferedReader = Files.newBufferedReader(path, StandardCharsets.UTF_8);
        while ((line = bufferedReader.readLine()) != null) {
            // 追加内容,处理换行
            data.append(line).append("\n");
        }
        return data.toString();
    }
}
posted @ 2020-03-12 22:04  mahoshojo  阅读(454)  评论(0编辑  收藏  举报