1.如果不更改代碼，則必須將該文件放置在項目的根文件夾中。 否則，其引用為src/frp/dichromatic.dat

2.做這樣的事情：

public static void main(String[] args) {

FileReader file = null;

try {

file = new FileReader(new File("dichromatic.dat"));

} catch (FileNotFoundException e1) {

System.err.println("File dichromatic.dat not found!");

e1.printStackTrace();

}

BufferedReader br = new BufferedReader(file);

String line;

try {

while ((line = br.readLine()) != null) {

System.out.println(line);

}

} catch (IOException e) {

System.err.println("Error when reading");

e.printStackTrace();

} finally {

if (br != null) {

try {

br.close();

} catch (IOException e) {

System.err.println("Unexpected error");

e.printStackTrace();

}

}

}

}

3。創建一個新的txt文件“格式化”。在這個例子中，格式化將把字符設置為大寫。

public static void main(String[] args) {

FileReader file = null;

BufferedWriter bw = null;

File outputFile = new File("output.formatted");

try {

file = new FileReader(new File("dichromatic.dat"));

} catch (FileNotFoundException e1) {

System.err.println("File dichromatic.dat not found!");

e1.printStackTrace();

}

try {

bw = new BufferedWriter(new FileWriter(outputFile));

} catch (IOException e1) {

System.err.println("File is not writtable or is not a file");

e1.printStackTrace();

}

BufferedReader br = new BufferedReader(file);

String line;

String lineformatted;

try {

while ((line = br.readLine()) != null) {

lineformatted = format(line);

bw.write(lineformatted);

// if you need it

bw.newLine();

}

} catch (IOException e) {

System.err.println("Error when processing the file!");

e.printStackTrace();

} finally {

if (br != null) {

try {

br.close();

} catch (IOException e) {

System.err.println("Unexpected error");

e.printStackTrace();

}

}

if (bw != null) {

try {

bw.close();

} catch (IOException e) {

System.err.println("Unexpected error");

e.printStackTrace();

}

}

}

}

public static String format(String line) {

// replace this with your needs

return line.toUpperCase();

}

總結

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