Java IO文件操作

//读文件 BufferedReaderBufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(new File("fileUrl"))));String tempStr = "";while((tempStr = br.readLine())!=null){System.out.println(tempStr);}//写文件 PrintWriterPrintWriter pw = new PrintWriter(new File("fileUrl"));pw.println("每一次输出一行到文件");//写文件 BufferedWriterBufferedWriter bw = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(new File("fileUrl"))));bw.write("");//一次读取文件所有内容File file = new File("filePath");Long l = file.length();byte[] fc = new byte[l.intValue()];FileInputStream fis = new FileInputStream(file);fis.read(fc);fis.close();String str = new String(fc,"UTF-8");