Java读取文件内容的六种方法（详细教程）
第一种FileInputStream 文件读取
FileInputStream inputStream = null; try {
File file = new File("file.txt"); inputStream = new FileInputStream(file); int content; while ((content = inputStream.read()) != -1) {
// 处理读取到的字节 } } catch (IOException e) {
e.printStackTrace(); } finally {
if (inputStream != null) {
try {
inputStream.close(); } catch (IOException e) {
e.printStackTrace(); } } } 讯享网
BufferedReader：文件读取
讯享网BufferedReader reader = null; try {
File file = new File("file.txt"); FileReader fileReader = new FileReader(file); reader = new BufferedReader(fileReader); String content; while ((content = reader.readLine()) != null) {
// 处理读取到的一行字符串 } } catch (IOException e) {
e.printStackTrace(); } finally {
if (reader != null) {
try {
reader.close(); } catch (IOException e) {
e.printStackTrace(); } } }
文件写入FileOutputStream：
FileOutputStream outputStream = null; try {
File file = new File("file.txt"); outputStream = new FileOutputStream(file); String content = "Hello, world!"; byte[] bytes = content.getBytes(); outputStream.write(bytes); } catch (IOException e) {
e.printStackTrace(); } finally {
if (outputStream != null) {
try {
outputStream.close(); } catch (IOException e) {
e.printStackTrace(); } } } PrintWriter：文件写入
讯享网PrintWriter writer = null; try {
File file = new File("file.txt"); FileWriter fileWriter = new FileWriter(file); writer = new PrintWriter(fileWriter); String content = "Hello, world!"; writer.println(content); } catch (IOException e) {
e.printStackTrace(); }
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