如何创建文件并将其他文件中的内容复制到java中创建的文件中？

How to create an file and copy the content from another file into the created file in java?

本问题已经有最佳答案，请猛点这里访问。

我正试图读取一个文件并将其写入另一个文件。它不起作用。我从主文件调用该方法

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public boolean copy(String inputPlayList, String outputPlayList, int numberOfMunites)
{
String start1 ="#EXTINF:";
String afterNum =";";

try
{

声明将用于传递方法的变量

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File fInput, fOutput;
String s;
String a;

将这些变量赋给方法

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fInput = new File(inputPlayList);
fOutput = new File(outputPlayList);

// Now I am using bufferedRead and BufferedWriter to read and write in a file

BufferedReader br = new BufferedReader(new FileReader(new File(inputPlayList)));
BufferedWriter out = new BufferedWriter(new BufferedWriter(new FileWriter(outputPlayList)));

// creating a while saying while the line is not finish contunue to read

while((s = br.readLine())!= null)
{
if(s.contains(start1)) {
String numberInString = s.substring(start1.length(), s.indexOf(afterNum));
numberOfMunites+= Integer.getInteger(numberInString);

}
// when it is finsh close the file.
out.write(s);

}
out.close();
System.out.println("donne");

}catch ( IOException e)
{
System.err.println("the is an erro that need to be fixed"+e);
}
return false;
}

}

相关讨论

这里是，但我不明白数字论据的含义，它的目的是什么？我改变了执行方式，从功能上计算了几分钟。

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import java.io.*;

public class Main {

public static void main(String[] args) {
System.out.println(copy("D:\\1.txt","D:\\2.txt", 0)); //returns the calculated number of minutes
}

public static int copy(String inputPlayList, String outputPlayList, int numberOfMinutes) {
String start1 ="#EXTINF:";
String afterNum =";";
try {
BufferedReader br = new BufferedReader(new FileReader(new File(inputPlayList)));
PrintWriter out = new PrintWriter(new FileWriter(outputPlayList));

String s;
while ((s = br.readLine()) != null) {
if (s.contains(start1)) {
String numberInString = s.substring(start1.length(), s.indexOf(afterNum));
numberOfMinutes += Integer.parseInt(numberInString);
}
out.println(s);
}
out.close();

} catch (IOException e) {
System.err.println("Exception" + e);
}
return numberOfMinutes;
}
}