Java 运行程序时写入值
我想将一些数据写入.txt文件Java 运行程序时写入值,java,Java,我想将一些数据写入.txt文件 public void writeToFile(String filename) { try { //Construct the BufferedWriter object bufferedWriter = new BufferedWriter(new FileWriter(filename)); //Start writing to the output stream buf
public void writeToFile(String filename) {
try {
//Construct the BufferedWriter object
bufferedWriter = new BufferedWriter(new FileWriter(filename));
//Start writing to the output stream
bufferedWriter.write("first value : " + firstValue);
bufferedWriter.newLine();
} catch (FileNotFoundException ex) {
ex.printStackTrace();
} catch (IOException ex) {
ex.printStackTrace();
} finally {
//Close the BufferedWriter
try {
if (bufferedWriter != null) {
bufferedWriter.flush();
bufferedWriter.close();
}
} catch (IOException ex) {
ex.printStackTrace();
}
}
}
我使用这段代码,但问题是,它不断地覆盖第一行(我想)。
有人知道我如何解决这个问题吗?
我从串行端口读取了everey 50ms a值,不想写这个。(每个值都在单独的行中)
它应该写入值,直到我关闭程序
致以最诚挚的问候试着换一行:
bufferedWriter = new BufferedWriter(new FileWriter(filename));
致:
我将以追加模式打开文件写入,它将在文件中添加内容,而不是覆盖它。按如下方式打开写入程序:
bufferedWriter = new BufferedWriter(new FileWriter(filename, true));
这将打开要追加的文件。看
bufferedWriter = new BufferedWriter(new FileWriter(filename, true));