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| import com.alibaba.fastjson.JSON;
import org.apache.commons.lang3.Validate;
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;
import java.util.List;
/**
* @author youthred
*/
public class FileUtil {
private String parentPath;
public FileUtil(String parentPath) {
this.parentPath = parentPath;
}
/**
* 新增文件
*
* @param fileName 完整文件名称（包括后缀）
* @param data 存入数据
* @return 文件绝对路径
* @throws IOException e
*/
public String save(String fileName, String data) throws IOException {
Path path = Paths.get(parentPath, fileName);
Validate.isTrue(Files.notExists(path), "文件已存在");
Files.createFile(path);
BufferedWriter bufferedWriter = Files.newBufferedWriter(path, StandardCharsets.UTF_8);
bufferedWriter.write(data); // 写入自动缓存优化
bufferedWriter.flush();
bufferedWriter.close();
return path.toString();
}
/**
* 覆盖原文档
*
* @param fileName 完整文件名称（包括后缀）
* @param data 存入数据
* @throws IOException e
*/
public void update(String fileName, String data) throws IOException {
Path path = Paths.get(parentPath, fileName);
// 覆盖
if (!Files.exists(path)) {
Files.createFile(path);
}
BufferedWriter bufferedWriter = Files.newBufferedWriter(path, StandardCharsets.UTF_8);
bufferedWriter.write(data);
bufferedWriter.flush();
bufferedWriter.close();
}
/**
* 删除文档
*
* @param fileName 完整文件名称（包括后缀）
* @return 删除成功与否
* @throws IOException e
*/
public boolean delete(String fileName) throws IOException {
Path path = Paths.get(parentPath, fileName);
return Files.deleteIfExists(path);
}
/**
* 获取文档
*
* @param fileName 完整文件名称（包括后缀）
* @return 文档数据
* @throws IOException e
*/
public String get(String fileName) throws IOException {
Path path = Paths.get(parentPath, fileName);
String line;
StringBuilder data = new StringBuilder();
BufferedReader bufferedReader = Files.newBufferedReader(path, StandardCharsets.UTF_8);
while ((line = bufferedReader.readLine()) != null) {
data.append(line).append("\n");
}
return data.toString();
}
/**
* 获取文档
*
* @param fileName 完整文件名称（包括后缀）
* @return 文档数据
* @throws IOException e
*/
public <T> List<T> get2parseArray(String fileName, Class<T> clazz) throws IOException {
return JSON.parseArray(this.get(fileName), clazz);
}
/**
* 获取文档
*
* @param fileName 完整文件名称（包括后缀）
* @return 文档数据
* @throws IOException e
*/
public <T> T get2parseObject(String fileName, Class<T> clazz) throws IOException {
return JSON.parseObject(this.get(fileName), clazz);
}
}
|