Question

java 字节流 多个文件写入一个文件 为什么前面写入的内容会被覆盖了

Answer 1

FileOutputStream fos = new FileOutputStream(file,true);
你创建输出流的时候将第二个参数设为true就好了。

Answer 2

package javaTest;

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.PrintWriter;
import java.util.StringTokenizer;

public class Test
{
public static void main(String[] args) throws Exception
{
BufferedReader br = new BufferedReader(new FileReader("D:\\test.txt"));
StringBuffer sb = new StringBuffer();
String lineContent = null ;
while( (lineContent = br.readLine()) != null)
{
StringTokenizer st = new StringTokenizer( lineContent," " );

for( int t=0; st.hasMoreElements() ; t++){
String word = (String) st.nextElement();
sb.append( word );
if( t== 0){
sb.append(" ");
}
if( t==1){
sb.append(" ");
}
}
sb.append("\n");
}
PrintWriter pw = new PrintWriter("D:\\test1.txt");
pw.write(sb.toString());
br.close();
pw.close();
}

}

具体的自己改改吧。

Answer 3

实现封装

追问

能有代码不