我想读取.txt文件中的行(在本例中为input.txt),并将它们写入另外两个.txt文件中,具体取决于每行开头的整数是奇数还是偶数。我必须使用DataInputStream / DataOutputStream和BufferedInputStream / BufferedOutputStream。
输入文件如下所示。
1 String1 1.1
2 String2 2.2
3 String3 3.3
4 String4 4.4
5 String5 5.5
6 String6 6.6
7 String7 7.7
8 String8 8.8
9 String9 9.9
10 String10 10.1
当我运行程序时,我在readUTF部分得到一个EOFException。当我评论这些部分并尝试只写整数时,奇数文件中只有“1”,偶数文件中只有“2”。它不会复制所有整数。
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.EOFException;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
public class datastream {
public static void main(String[] args) throws IOException {
DataInputStream inputStream = null;
DataOutputStream outputStreamEven = null;
DataOutputStream outputStreamOdd = null;
try {
inputStream = new DataInputStream (new BufferedInputStream ( new FileInputStream("src/input.txt")));
outputStreamEven = new DataOutputStream (new BufferedOutputStream ( new FileOutputStream("src/even.txt")));
outputStreamOdd = new DataOutputStream (new BufferedOutputStream ( new FileOutputStream("src/odd.txt")));
int number;
String textinput;
double doublenumber;
number = inputStream.readInt();
textinput = inputStream.readUTF();
doublenumber = inputStream.readDouble();
while ((number = inputStream.read()) % 2 != 0) {
outputStreamOdd.writeInt(number);
outputStreamOdd.writeUTF(textinput);
outputStreamOdd.writeDouble(doublenumber);
}
while ((number = inputStream.read()) % 2 == 0) {
outputStreamEven.writeInt(number);
outputStreamEven.writeUTF(textinput);
outputStreamEven.writeDouble(doublenumber);
}
} finally {
if (inputStream != null) {
inputStream.close();
}
if (outputStreamEven != null) {
outputStreamEven.close();
}
if (outputStreamOdd != null) {
outputStreamOdd.close();
}
}
}
}
如何将所有行复制到相应的文本文件(以及每行包含其所有内容)?
答案 0 :(得分:2)
您正在操作文本文件,因此您应该使用字符流来处理此问题。
因此,使用BufferedReader和BufferedWriter可以帮助您以简单的方式解决此问题。这是一个代码。我已将示例数据复制到文本文件中,并将其称为sourceData.txt
public class OddEvenFileManager {
public static final String DATA_SOURCE_PATH = "sourceDatas.txt";
public static final String ODD_TARGET_PATH = "oddDatas.txt";
public static final String EVEN_TARGET_PATH = "evenDatas.txt";
public static void doOddEvenSplitting() throws IOException, NumberFormatException {
BufferedReader sourceReader = new BufferedReader(new FileReader(new File(DATA_SOURCE_PATH)));
BufferedWriter oddWriter = new BufferedWriter(new FileWriter(new File(ODD_TARGET_PATH)));
BufferedWriter evenWriter = new BufferedWriter(new FileWriter(new File(EVEN_TARGET_PATH)));
String sourceLine = null;
while ((sourceLine = sourceReader.readLine()) != null) {
int lineNumber = Integer.parseInt(sourceLine.split(" ")[0]);
if (lineNumber % 2 == 0) {
evenWriter.write(sourceLine);
evenWriter.newLine();
} else {
oddWriter.write(sourceLine);
oddWriter.newLine();
}
}
sourceReader.close();
oddWriter.close();
evenWriter.close();
}
public static void main(String[] args) throws IOException, NumberFormatException {
doOddEvenSplitting();
}
}