java 行尾，FileWriter \n
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End of line, FileWriter \n
提问by Anticipating
I'm trying to append a newline to an already existing file, but all commands I've tried have resulted in just appending to the first line. I want the output in the file to look like
我正在尝试将换行符附加到已经存在的文件中，但我尝试过的所有命令都导致仅附加到第一行。我希望文件中的输出看起来像
ROW1
第1行
ROW2
第2行
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){
}
How do I solve this?
我该如何解决这个问题？
回答by tajhamille
I have tried the following code and it seems to produce what you are after.
我已经尝试了以下代码，它似乎产生了你想要的东西。
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("********************");
}
}
To test it I put the line "This is the first line." at the start of my test file. After running it a few times, the output looks like this:
为了测试它，我放了一行“这是第一行”。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
这是第一行。
第 1 行：1335189657127
第 2 行：1335189657127
第 1 行：1335189658390
第 2 行：1335189658390
第 1 行：1335189665738
第 2 行：1335189665738
第 1 行：1335189679638
第 2 行：1335189679638
As you can see from the timestamps, I am appending new lines to the end of the file each time.
从时间戳中可以看出，我每次都在文件末尾添加新行。
回答by TechSpellBound
Instead of adding one new line, try adding two newlines in a row.
不要添加一个新行，而是尝试在一行中添加两个换行符。
One for going to the line below ROW1 and the other for inserting one more blank line.
一个用于转到 ROW1 下方的行，另一个用于再插入一个空行。
回答by Rahul Borkar
Please use following code,
请使用以下代码，
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.newLine();
writer.close();
}catch(Exception e){
}
回答by Shaikh Farooque
Instead of using writer.newLine();
而不是使用 writer.newLine();
You should use writer.write("\\n\\r");
你应该使用 writer.write("\\n\\r");
回答by Gijs Overvliet
You can also try to use PrintWriter.println(String s)
您也可以尝试使用 PrintWriter.println(String s)
http://docs.oracle.com/javase/6/docs/api/java/io/PrintWriter.html
http://docs.oracle.com/javase/6/docs/api/java/io/PrintWriter.html
回答by Mike Adler
If you just want the final line break, append the writer.newLine()after writer.write("Row2").
If there is no newLine being written, writer.newLine()may write the wrong line end marker into the file. Write it by hand.
如果您只想要最后的换行符，请writer.newLine()在writer.write("Row2"). 如果没有写入 newLine，则writer.newLine()可能将错误的行结束标记写入文件。手写吧。
回答by wattostudios
Why don't you force it to write at the end of the file by including the offsetin the write commands...
为什么不通过offset在写入命令中包含 来强制它在文件末尾写入...
private void addToFavToFile(String site){
BufferedWriter writer = null;
File root = Environment.getExternalStorageDirectory();
try{
File fileToWrite = new File(Environment.getExternalStorageDirectory()+"/test2.txt");
int endOfFile = (int)file.length();
writer = new BufferedWriter(new FileWriter(fileToWrite,true));
String string1 = "ROW1";
writer.write(File.separator + string1,endOfFile,string1.length);
endOfFile += string1.length;
String string2 = "ROW2";
writer.write(File.separator + string2,endOfFile,string2.length);
endOfFile += string2.length;
writer.close();
}catch(Exception e){
}
