android - 发现依赖默认编码：new java.io.FileWriter(File, boolean)

Question

我正在使用 FileWrite 类写入文件。它工作正常。但是 FindBugs 在我的代码片段中指出了一个小问题。

代码片段：

  SimpleDateFormat formatter = new SimpleDateFormat("yyyy_MM_dd");
        Date now = new Date();
        String fileName = formatter.format(now) + ".txt";
        FileWriter writer = null;
        try {
            File root = new File(Environment.getExternalStorageDirectory(), "Test");
            if (!root.exists()) {
                root.mkdirs();
            }
            File gpxfile = new File(root, fileName);

            writer = new FileWriter(gpxfile, true);
            writer.append(text + "\n\n");

        } catch (IOException e) {
            e.printStackTrace();

        } finally {
            if (writer != null) {
                try {
                    writer.flush();
                    writer.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }

查找错误报告：

依赖默认编码发现依赖默认编码：new java.io.FileWriter(File, boolean)

我在哪一行收到此错误？

  writer = new FileWriter(gpxfile, true);

有人可以简要介绍一下这到底是什么吗？我们如何解决这个问题？

Answer 1

通过替换解决了这个问题

FileWriter writer = new FileWriter(gpxfile, true);

和

  FileOutputStream fileStream = new FileOutputStream(gpxfile);
            writer = new OutputStreamWriter(fileStream, "UTF-8");

Answer 2

File file = new File(someFilePath);
Writer w = new OutputStreamWriter(new FileOutputStream(file), "UTF-8");
PrintWriter pw = new PrintWriter(w);
pw.println(someContent);
pw.close();

Answer 3

import java.io.BufferedWriter;
import java.io.File;
import java.nio.charset.Charset;
import java.nio.file.Files;

Charset charSet = Charset.forName("UTF-8");
File file = new File(someFilePath);
BufferedWriter bufferedWriter = Files.newBufferedWriter(file.toPath(), charSet);
bufferedWriter.write(header);
bufferedWriter.close();