Java文件操作

我在输入文件a.txt中有一些内容

Line 1 : "abcdefghijk001mnopqr hellohello"
Line 2 : "qwertyuiop002asdfgh welcometologic"
Line 3 : "iamworkingherefromnowhere002yes somethingsomething"
Line 4 : "thiswillbesolved001here ithink"

我必须读取a.txt文件并将其写入两个单独的文件。即，具有001的行应写入output1.txt，具有002的行应写入output2.txt

有人能帮我用Java编程中的逻辑吗

谢谢，

---

Naren

这里是一个很好的示例，检查条件可以执行以下操作

while ((line = reader.readLine()) != null) {
    //process each line in some way
    if(line.contains("001") {
     fileWriter1.write(line);  
    } else if (line.contains("002") ) {
     fileWriter2.write(line);    
    }
  } 

方法sendToFile001（）和sendToFile002（）编写参数行，如下所示：

ps001.println( line );

使用PrintStream类型的ps001和ps002，在之前打开（在构造函数中？

代码完成

 /*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package jfile;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.net.URL;

/**
 *
 * @author andy
 */
public class JFile {

    /**
     * @param args the command line arguments
     */

    static File master = null,
                m1     = null, // file output with "001"
                m2     = null; // file output with "002"

    static FileWriter fw1,
                      fw2;

    static FileReader fr = null;
    static BufferedReader br = null;

    public static void main(String[] args) throws FileNotFoundException, IOException
    {

         String root = System.getProperty("user.dir") + "/src/files/";

         master = new File ( root + "master.txt" );
         m1     = new File ( root + "m1.txt");
         m2     = new File ( root + "m2.txt");

         fw1     = new FileWriter(m1, true);
         fw2     = new FileWriter(m2, true);


         fr = new FileReader (master);
         br = new BufferedReader(fr);

         String line;
         while((line = br.readLine())!=null)
         {
             if(line.contains("001")) 
             {               
                 fw1.write(line + "\n");

             } else if (line.contains("002"))
             {
                 fw2.write(line + "\n");

             }
         }

         fw1.close();
         fw2.close();
         br.close();
    }

}

---

Project Netbeans:

欢迎来到Stackoverflow。你的问题很好。谷歌搜索并尝试一些东西，如果有任何错误或逻辑错误等，请在这里发布代码以获得解决。如果我这样做，我不会写所有的行，只有最后一个迭代的行会被写。如果一行包含001和002怎么办？（删除ifs之间的else）

 /*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package jfile;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.net.URL;

/**
 *
 * @author andy
 */
public class JFile {

    /**
     * @param args the command line arguments
     */

    static File master = null,
                m1     = null, // file output with "001"
                m2     = null; // file output with "002"

    static FileWriter fw1,
                      fw2;

    static FileReader fr = null;
    static BufferedReader br = null;

    public static void main(String[] args) throws FileNotFoundException, IOException
    {

         String root = System.getProperty("user.dir") + "/src/files/";

         master = new File ( root + "master.txt" );
         m1     = new File ( root + "m1.txt");
         m2     = new File ( root + "m2.txt");

         fw1     = new FileWriter(m1, true);
         fw2     = new FileWriter(m2, true);


         fr = new FileReader (master);
         br = new BufferedReader(fr);

         String line;
         while((line = br.readLine())!=null)
         {
             if(line.contains("001")) 
             {               
                 fw1.write(line + "\n");

             } else if (line.contains("002"))
             {
                 fw2.write(line + "\n");

             }
         }

         fw1.close();
         fw2.close();
         br.close();
    }

}