13518219792
如何用Java实现两个文件的拼接
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String类的方法：
①利用运算符"+"
②public String concat(String str)进行字符串的拼接操作
StringBuffer的方法：
①public StringBuffer append(String str)将str添加到当前字符串缓冲区的字符序列的末尾
②public StringBuffer insert(int offset,String str)在当前字符串缓冲区的字符序列的下标
索引offset插入str。如果offset等于旧长度，则str添加在字符串缓冲区的尾部
使用java编程语言，对文件进行操作，合并多个文件，代码如下：
import static java.lang.System.out;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.util.Arrays;
public class test {
public static final int BUFSIZE = 1024 * 8;
public static void mergeFiles(String outFile, String[] files) {
FileChannel outChannel = null;
out.println("Merge " + Arrays.toString(files) + " into " + outFile);
try {
outChannel = new FileOutputStream(outFile).getChannel();
for(String f : files){
FileChannel fc = new FileInputStream(f).getChannel();
ByteBuffer bb = ByteBuffer.allocate(BUFSIZE);
while(fc.read(bb) != -1){
bb.flip();
outChannel.write(bb);
bb.clear();
}
fc.close();
}
out.println("Merged!! ");
} catch (IOException ioe) {
ioe.printStackTrace();
} finally {
try {if (outChannel != null) {outChannel.close();}} catch (IOException ignore) {}
}
}
//下面代码是将D盘的1.txt 2.txt 3.txt文件合并成out.txt文件。
public static void main(String[] args) {
mergeFiles("D:/output.txt", new String[]{"D:/1.txt", "D:/2.txt", "D:/3.txt"});
}
}
//帮你写了一个，是两个mp3文件的合并
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
/**
* 把两个.mp3文件合并成一个.mp3文件
*
* @author wangran
*
*/
public class Merger {
public Merger() {
}
public static void main(String[] args) {
FileInputStream fis = null;
FileOutputStream fos = null;
BufferedInputStream bis = null;
BufferedOutputStream bos = null;
//源文件
File in1 = new File("D:/杂/娱乐/音乐/hero.mp3");
File in2 = new File("D:/杂/娱乐/音乐/careless whisper.mp3");
//目标文件
File out = new File("D:/music2.mp3");
//进行流操作
try {
fis = new FileInputStream(in1);
fos = new FileOutputStream(out, true);
bis = new BufferedInputStream(fis);
bos = new BufferedOutputStream(fos);
int len;
byte[] buf = new byte[1024];
while ((len = bis.read(buf))!=-1) {
bos.write(buf,0,len);
}
bos.flush();
fis = new FileInputStream(in2);
bis = new BufferedInputStream(fis);
while ((len = bis.read(buf)) != -1) {
bos.write(buf,0,len);
}
bos.flush();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
//关闭流
if (bis != null)
try {
bis.close();
} catch (IOException e) {
e.printStackTrace();
}
if (bos != null)
try {
bos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
import java.io.File;
import java.io.PrintStream;
import java.util.Scanner;
/**
* 2015年11月18日上午9:31:05
*
* @author cs2110 TODO 合并数组
*
*/
public class MergeFile {
private String afile = "D:/1.txt";
private String bfile = "D:/2.txt";
private String mergefile = "D:/3.txt";
/**
* 读取文件里面的整数
*
* @param input
* Scanner对象
* @return 返回整形数组
*/
public int[] readFile(Scanner input) {
try {
String temp = "";
while (input.hasNextInt()) {
temp += input.nextInt() + ",";
}
String[] nums = temp.split(",");
int[] arr = new int[nums.length];
for (int index = 0; index nums.length; index++) {
arr[index] = Integer.parseInt(nums[index]);
}
return arr;
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
/**
* 合并数组
*
* @param a
* 数组1
* @param b
* 数组2
* @return 整形数组
*/
public int[] merge(int[] a, int[] b) {
int len = a.length;
if (b.length len) {
len = b.length;
}
int[] all = new int[a.length + b.length];
int index = 0;
int aIndex = 0;
int bIndex = 0;
while (aIndex len || bIndex len) {
if (a[aIndex] b[bIndex]) {
all[index] = a[aIndex];
aIndex++;
} else {
all[index] = b[bIndex];
bIndex++;
}
index++;
}
if (aIndex a.length) {
while (aIndex a.length) {
all[index++] = a[aIndex++];
}
} else {
while (bIndex b.length) {
all[index++] = b[bIndex++];
}
}
return all;
}
/**
* 写入文件
*
* @param print
* PrintStream
* @param a
* 数组
*/
public void writeFile(PrintStream print, int[] a) {
for (int index = 0; null != a index a.length; index++) {
print.append(a[index] + "\r\n");
}
}
public static void main(String[] args) {
MergeFile merge = new MergeFile();
if (null != args args.length 2) {// 输入参数合法,则使用,否则按照默认
merge.afile = args[0];
merge.bfile = args[1];
merge.mergefile = args[2];
} else {
System.out.println("Using the default file");
}
Scanner input = null;
int[] a = null;
int[] b = null;
int[] all = null;
try {
input = new Scanner(new File(merge.afile));
a = merge.readFile(input);
input = new Scanner(new File(merge.bfile));
b = merge.readFile(input);
all = merge.merge(a, b);
PrintStream print = new PrintStream(new File(merge.mergefile));
merge.writeFile(print, all);
} catch (Exception e) {
e.printStackTrace();
}
}
}
