Question

我需要编写一个java代码，用于将大文件拆分为多个较小的文件。

我的文件看起来像

Begin for all values of X
1 abc 5:40
2 pqr 6:40
3 xyz 7:40
End

Begin for all values of Y
1 ccc 9:40
2 ddd 8:40
3 lll 6:40
End

输出将是：

X.txt(Filename)
1 abc 5:40
2 pqr 6:40
3 xyz 7:40

Y.txt(Filename)
1 ccc 9:40
2 ddd 8:40
3 lll 6:40

Answer 1

你的问题不明确，你可以通过一些表达式将一个字符串拆分成字符串数组......

<p>Input something in the input box:</p>
   <div id="ren">
     <p ng-if="showName">Name: <input type="text" ng-model="name"></p>
   </div>
   <p ng-bind="name"></p>
 </div>
<button type="button" ng-click="showName!=showName">click</button>

Answer 2

以下代码可以满足您的需求。要检查文件边界，我测试字符串是否以Begin for all values of开头，如果您有任何其他条件，则可以将其替换为该字符串。

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.Writer;

public class Test {

    public static void main(String[] args) {
        BufferedReader reader = null;
        try {
            reader = new BufferedReader(new FileReader("input.txt"));
            String line = null;
            BufferedWriter writer = null;
            while( (line = reader.readLine()) != null) {
                if(line.startsWith("Begin for all values of")) {
                    String fileName = line.substring(line.length() -1);
                    closeWriter(writer);

                    writer = new BufferedWriter(new FileWriter(fileName + ".txt"));
                }
                writer.write(line + "\n");
            }
            closeWriter(writer);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if(reader != null) {
                try {
                    reader.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }

    public static void closeWriter(Writer output) {
        try {
            if(output != null) {
                output.close();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

}

将输入文件拆分为多个文件

2 个答案: