java - 行尾，FileWriter\n

Question

我正在尝试将换行符 append 到已存在的文件中，但我尝试过的所有命令都导致仅 append 到第一行。我希望文件中的输出看起来像

行1

行2

 private void addToFavToFile(String site){
        BufferedWriter writer = null;
        File root = Environment.getExternalStorageDirectory();
        try{
            writer = new BufferedWriter(new FileWriter(Environment.getExternalStorageDirectory()+"/test2.txt",true));
            writer.write("ROW1");
            writer.newLine();
            writer.write("ROW2");
            writer.close();
        }catch(Exception e){

        }

如何解决这个问题？

Answer 1

我尝试了以下代码，它似乎产生了您想要的结果。

import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;

public class TestNewLines {

public static void main(String[] args) {
    TestNewLines testFiles = new TestNewLines();
    testFiles.addToFavToFile("");
}

private void addToFavToFile(String site){
    BufferedWriter writer = null;
    try{
        writer = new BufferedWriter(new FileWriter("test.txt",true));
        insertEmptyLine(writer);
        writer.write("ROW1: " + System.currentTimeMillis());
        insertEmptyLine(writer);
        writer.write("ROW2: " + System.currentTimeMillis());
        insertSeperator(writer);
        writer.close();
    } catch(Exception e){

    }
}

private void insertEmptyLine(BufferedWriter writer) throws IOException {
    writer.newLine();
    writer.newLine();
}

private void insertSeperator(BufferedWriter writer) throws IOException {
    writer.newLine();
    writer.write("********************");
}
}

为了测试它，我添加了“这是第一行”这一行。在我的测试文件的开头。运行几次后，输出如下所示:

This is the first line.

ROW1: 1335189657127

ROW2: 1335189657127

---

ROW1: 1335189658390

ROW2: 1335189658390

---

ROW1: 1335189665738

ROW2: 1335189665738

---

ROW1: 1335189679638

ROW2: 1335189679638

---

正如您从时间戳中看到的，我每次都会在文件末尾 append 新行。