求大家帮忙解决个小问题 - 黑马程序员技术交流社区

import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintStream;
import java.io.SequenceInputStream;
import java.util.Enumeration;
import java.util.Vector;
/**
* 示例：用合并流将part1.txt,part2.txt,part3.txt三个文件
* 打印到total.txt文件中
* @author lt
*/
public class SequeceInputStreamDemo {
//获取Vector对象，传入的参数个数是可变长度的，Vector中可以添加任意多个元素
public static Vector<InputStream> getVector(String... values) throws FileNotFoundException{
Vector<InputStream> v = new Vector<InputStream>();
for(int i = 0;i < values.length;i++){
try {
v.add(new FileInputStream(values[i]));
} catch (FileNotFoundException e) {
throw e;
}
}
return v;
}
//打印三个文件中的内容到一个文件中去
public static void printToTotal(Vector<InputStream> v) throws IOException{
Enumeration<InputStream> e = v.elements();
//输入流是一个合并流
BufferedReader br = new BufferedReader(new InputStreamReader(new SequenceInputStream(e)));
PrintStream ps = new PrintStream(new FileOutputStream("total.txt"),true);
String line = null;
try {
while((line = br.readLine()) != null){
ps.println(line);
}
} catch (IOException e1) {
throw e1;
}
}
public static void main(String[] args) {
String path1 = "part1.txt";
String path2 = "part2.txt";
String path3 = "part3.txt";
Vector<InputStream> v = null;
try {
v = getVector(path1,path2,path3);
printToTotal(v);
} catch (FileNotFoundException e) {
System.out.println("文件路径有误!");
} catch (IOException e) {
System.out.println("目标文件无法创建！");
}
}
}

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