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//类似于此
public static void main(String[] args) throws Exception {
BufferedReader reader = new BufferedReader(new FileReader("D:\\workspace\\test\\src\\test.txt"));
boolean start = false;
StringBuilder sb = new StringBuilder();
while(true){
String line = reader.readLine();
if(line == null) break;
if(!start){
if(line.indexOf("AAA") != -1){
line = line.substring(line.indexOf("AAA"));
sb.append(line).append("\n");
start = true;
continue;
}
}else{
if(line.indexOf("BBB") != -1){
line = line.substring(0, line.indexOf("BBB") + "BBB".length());
sb.append(line).append("\n");
start = false;
break;
}else{
sb.append(line).append("\n");
}
}
}
System.out.println(sb.toString());
}