一、读txt文件
public static String readFile(File file, String charset){ //设置默认编码 if(charset == null){ charset = "UTF-8"; } if(file.isFile() && file.exists()){ try { FileInputStream fileInputStream = new FileInputStream(file); InputStreamReader inputStreamReader = new InputStreamReader(fileInputStream, charset); BufferedReader bufferedReader = new BufferedReader(inputStreamReader); StringBuffer sb = new StringBuffer(); String text = null; while((text = bufferedReader.readLine()) != null){ sb.append(text); } return sb.toString(); } catch (Exception e) { // TODO: handle exception } } return null; }
二、写txt文件
/** * 以FileWriter方式写入txt文件。 * @param File file:要写入的文件 * @param String content: 要写入的内容 * @param String charset:要写入内容的编码方式 */ public static void writeToFile1(){ try { String content = "测试使用字符串"; File file = new File("./File/test1.txt"); if(file.exists()){ FileWriter fw = new FileWriter(file,false); BufferedWriter bw = new BufferedWriter(fw); bw.write(content); bw.close(); fw.close(); System.out.println("test1 done!"); } } catch (Exception e) { // TODO: handle exception } }
三、文件不存在时候,主动创建文件
public static void writeToFile2(){ try { String content = "测试使用字符串"; File file = new File("./File/test2.txt"); //文件不存在时候,主动穿件文件。 if(!file.exists()){ file.createNewFile(); } FileWriter fw = new FileWriter(file,false); BufferedWriter bw = new BufferedWriter(fw); bw.write(content); bw.close(); fw.close(); System.out.println("test2 done!"); } catch (Exception e) { // TODO: handle exception } }
四、使用FileOutputStream来写入txt文件
public static void writeToFile3(){ String content = "测试使用字符串"; FileOutputStream fileOutputStream = null; File file = new File("./File/test3.txt"); try { if(file.exists()){ file.createNewFile(); } fileOutputStream = new FileOutputStream(file); fileOutputStream.write(content.getBytes()); fileOutputStream.flush(); fileOutputStream.close(); } catch (Exception e) { // TODO: handle exception } System.out.println("test3 done"); }