分割大文本文件的程序，不能正常输出，请各位大神指教

[webqxy]

最近要做一个文本分割，要求把一个txt文件分割成十个txt文件，我想按照每个文本文件50行来分，下面是我写的四段代码，由于小弟java不太成熟，大神不要见笑，现在问题是生成的每个新文件里面只有一行文本（应该有50行才对的）

public class inputFile {
/**
* @param the start of pre_process
* @throws IOException
*/
public static void main(String[] args) throws IOException {
fileCut in=new fileCut("E:/reviewsNew.txt");//创建一个fileCut对象 in
in.inputfile();
}
}


public class fileCut implements RandomAccess{
private String filetrack;
private String copyline;
private int count=1;

public fileCut(String string) {
// TODO 传入文件路径
this.filetrack=string;
}

void inputfile() throws IOException{
// TODO 创建RandomAccessFile类型对象， 并读取文件
File track=new File(filetrack);
RandomAccessFile sourcefile=new RandomAccessFile(track, "r");
System.out.println("I have read it");

setName newname=new setName();
int t=newname.setName();//得到一个int型的变量，用于命名新文件

for(int i=0;i<10;i++){ //十次循环，每次新建一个文件
count=1;
writeLine write=new writeLine();// 声明一个writeLine对象write
int countfile = t++;
write.writeNewfile(countfile);
while(count<=50){ // 循环将58行写入一个文件
copyline = sourcefile.readLine();
write.writeLine(copyline);
count++;
} }
}
}


public class writeLine {
public String newinline;
public int a;
public writeLine(){
}

public DataOutputStream writefile(int a) throws FileNotFoundException{
DataOutputStream d = new DataOutputStream(new FileOutputStream("E:/files/"+a+".txt"));
return d;
}

public void writeNewfile(int t) throws FileNotFoundException {
a=t;
writefile(a);
}

public void writeLine(String s) throws IOException{
this.newinline=s;
writefile(a).writeBytes(newinline);
System.out.println("now I am writing into the file :"+a);
}

}
接下来这个函数写的有点累赘
public class setName {
int txtnum=0;

int setName(){
return txtnum;
}
}

我自己感觉是红色字体部分的循环有问题，可是就是找不到解决方法。。。

[Looking_Glass]

个人认为：
public class writeLine {
public String newinline;
public int a;
private DataOutputStream d;
public writeLine(){
}

public void writefile(int a) throws FileNotFoundException{
this.d = new DataOutputStream(new FileOutputStream("E:/files/"+a+".txt"));
}

public void writeNewfile(int t) throws FileNotFoundException {
a=t;
writefile(a);
}

public void writeLine(String s) throws IOException{
this.d.writeByte((s + "\r\n").getBytes());
}

}

应该可以。最好能加上close()方法。作用就是关闭DataOutputStream.在使用每个文件使用完毕使用。

[weiguoxin]

public class InputFile {
		/**
		* @param the start of pre_process
		* @throws IOException  
		*/
		public static void main(String[] args) throws IOException {
			FileCut in=new FileCut("E:/temp/test.txt");//创建一个fileCut对象 in
			in.inputfile();
		}
}

public class FileCut implements RandomAccess {
	private String filetrack;
	private String copyline;

	public FileCut(String string) {
		// TODO 传入文件路径
		this.filetrack = string;
	}

	void inputfile() throws IOException {
		// TODO 创建RandomAccessFile类型对象， 并读取文件
		File track = new File(filetrack);
		RandomAccessFile sourcefile = new RandomAccessFile(track, "r");
		System.out.println("I have read it");

		int t = 1;

		for (int i = 0; i < 10; i++) { // 十次循环，每次新建一个文件
			int count = 0;
			DataOutputStream d = new DataOutputStream(new FileOutputStream(
					"E:/" + (t++) + ".txt"));
			while (count < 50) { // 循环将58行写入一个文件
				copyline = sourcefile.readLine();
				d.writeBytes(copyline);
				count++;
			}
			d.close();
		}
	}
}

不知道你写这么多类要干嘛...不晕吗..?

[weiguoxin]

补充一下,要分行的话在

d.writeBytes(copyline);//后面加一句 d.writeChars("\n");

[shenjiao080601]

这是以前学习时候自己写的文件切割和文件合并的例子，希望对你有用：
package com.xinzhanedu1;

import java.io.*;

public class Testdevide {
public static void main(String[] args) {
File file = new File("E:/初恋这件小事.rmvb");
File file1 = new File("E:/1.rmvb");
File file2 = new File("E:/2.rmvb");

int i ,j = 0;
try {
FileInputStream fis = new FileInputStream(file);
BufferedInputStream bis = new BufferedInputStream(fis);

FileOutputStream fos1 = new FileOutputStream(file1);
BufferedOutputStream bos1 = new BufferedOutputStream(fos1);

FileOutputStream fos2 = new FileOutputStream(file2);
BufferedOutputStream bos2 = new BufferedOutputStream(fos2);

while((i = bis.read()) != -1) {
j++;
if (j < 100000000) {
bos1.write(i);
} else {
bos2.write(i);
}

}
fos1.flush();
fos2.flush();
fos1.close();
fos2.close();
fis.close();
} catch (FileNotFoundException e) {
System.out.println("文件没有找到！");
} catch (IOException e) {
System.out.println("输入输出异常！");
}
System.out.println("文件切割完成");
}
}
//**************************************
package com.xinzhanedu2;

import java.io.*;

public class TestCombine {
public static void main(String[] args) {
File file1 = new File("E:/1.rmvb");
File file2 = new File("E:/2.rmvb");
File file = new File("E:/combine.rmvb");

int i=0;

try {
FileInputStream fis1 = new FileInputStream(file1);
BufferedInputStream bis1 = new BufferedInputStream(fis1);

FileInputStream fis2 = new FileInputStream(file2);
BufferedInputStream bis2 = new BufferedInputStream(fis2);

FileOutputStream fos = new FileOutputStream(file);
BufferedOutputStream bos = new BufferedOutputStream(fos);

while((i = bis1.read())!=-1){
bos.write(i);
}
while((i = bis2.read())!=-1){
bos.write(i);
}

bos.flush();
bis1.close();
bis2.close();
bos.close();

} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
System.out.println("文件合并完成！");
}

}