InputStreamReader是把InputStream转换为Reader的,你应该这么写
BufferedReader in = new BufferedReader(new FileReader("hehe.txt"));
像这样才用InputStreamReader,因为System.in是个InputStream
BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
BufferedReader in = new BufferedReader(new FileReader("hehe.txt"));
像这样才用InputStreamReader,因为System.in是个InputStream
BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
那还想问问怎么把一个STRING 或BYTES[]写入一个文件呢?
谢谢
123
456
789
再把读出的String内容写入一个新的文件就成了123456789(其实读出的String就是123456789了)
请问怎样控制才能让它写入新文件时还是原来的3行格式。
FileInputStream fis = new FileInputStream("in.txt");
BufferedReader read = new BufferedReader(new InputStreamReader(fis));
String msg,oldbb;
while((msg=read.readLine()) != null){
buf.append(msg);
oldbb=buf.toString();
写入是这样的:
BufferedWriter bw = new BufferedWriter( new FileWriter( new File( "out.txt" ) ) );
bw.write( oldbb );
bw.close();怎样才能不改变原来文件的格式呢?很着急!请帮帮我。
BufferedReader read = new BufferedReader(new InputStreamReader(fis));
String msg,oldbb;
while((msg=read.readLine()) != null){
buf.append(msg);
oldbb=buf.toString();
这样过后:
PrintWriter out = new PrintWriter(new BufferedWriter(new FileWriter( new File( "out.txt" ) ) );
out.println(oldbb);
out.close();
但是就没有分行,也可以一边读,一边写,格式是一样的
要是想一边读,一边写,怎样才能写入文件时是追加前面的,不是覆盖呢?
再次感谢!
怎样一边读一边写,也就是追加文件内容啊?怎么做呢?
帮忙写一下,谢谢。