我就废话不多说了，大家还是直接看代码吧~
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import java.io.BufferedReader;import java.io.BufferedWriter;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.FileWriter;import java.io.IOException;import java.io.InputStreamReader;import java.io.ObjectInputStream;import java.io.ObjectOutputStream;import java.io.OutputStreamWriter;import java.io.StreamCorruptedException;import java.io.UnsupportedEncodingException;import java.util.List; import android.graphics.Bitmap; public class FileUtils { /** * 字符流写入字符串到txt */ @SuppressWarnings("resource") public static void FileString(String path, String data) { try { FileWriter writer = new FileWriter(path);// 字符流 writer.write(data); writer.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } /** * 字节输出到txt * * @param path * @param data */ @SuppressWarnings("resource") public static void FileString2(String path, String data) { try { FileOutputStream outputStream = new FileOutputStream(path);// 字节流 outputStream.write(data.getBytes()); outputStream.close(); } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } /** * 设置编码格式写出到txt * * @param path * @param data */ public static void FileString3(String path, String data) { try { OutputStreamWriter writer = new OutputStreamWriter(new FileOutputStream(path), "UTF-8");// 设置编码格式 writer.write(data); writer.close(); } catch (UnsupportedEncodingException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } /** * 追加写入到txt * * @param path * @param data */ @SuppressWarnings("resource") public static void FileString4(String path, String data) { try { FileOutputStream outputStream = new FileOutputStream(path, true);// 追加写入 outputStream.write(("\r\n" + data).getBytes()); outputStream.close(); } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } /** * 存储list到文件 * * @param path * @param list */ @SuppressWarnings("resource") public static <T> void FileWriteList1(String path, List<T> list) { try { FileOutputStream outputStream = new FileOutputStream(path); ObjectOutputStream stream = new ObjectOutputStream(outputStream); stream.writeObject(list); stream.close(); outputStream.close(); } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } /** * 设置编码格式存储list到txt * * @param path * @param list */ @SuppressWarnings("resource") public static <T> void FileWriteList(String path, List<T> list) { try { BufferedWriter bufferedWriter = new BufferedWriter( new OutputStreamWriter(new FileOutputStream(path), "UTF-8")); for (T s : list) { bufferedWriter.write(s.toString()); bufferedWriter.newLine(); bufferedWriter.flush(); } bufferedWriter.close(); } catch (UnsupportedEncodingException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } /** * bitmap 写入到本地 * * @param path * @param bitmap */ @SuppressWarnings("resource") public static void FileBitmap(String path, Bitmap bitmap) { try { FileOutputStream outputStream = new FileOutputStream(path); bitmap.compress(Bitmap.CompressFormat.PNG, 100, outputStream); outputStream.flush(); outputStream.close(); } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } /** * 读取本地文件数据设置指定编码 * * @param path */ @SuppressWarnings("resource") public static String FileInputString(String path) { StringBuffer buffer = new StringBuffer(); try { BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream(path), "UTF-8")); String data = null; while ((data = reader.readLine()) != null) { buffer.append(data + "\r\n"); } reader.close(); } catch (UnsupportedEncodingException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } return buffer.toString(); } /** * 根据字节读取文件 * * @param path * @return */ @SuppressWarnings("resource") public static String FileInputString2(String path) { StringBuffer buffer = new StringBuffer(); try { FileInputStream inputStream = new FileInputStream(path); byte[] bytes = new byte[1024]; int bytead = 0; while ((bytead = inputStream.read(bytes)) != -1) { buffer.append(new String(bytes, 0, bytead)); } inputStream.close(); } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } return buffer.toString(); } /** * 获取本地文件中的list * * @param path */ @SuppressWarnings("resource") public static <T> void FileInputList(String path) { try { FileInputStream inputStream = new FileInputStream(path); ObjectInputStream stream = new ObjectInputStream(inputStream); List<T> list = (List<T>) stream.readObject(); inputStream.close(); stream.close(); } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (StreamCorruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (ClassNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } } /** * 高效读取指定编码格式的文件 * @param path * @return */ @SuppressWarnings("resource") public static String FileInput3(String path) { StringBuffer buffer = new StringBuffer(); try { BufferedReader bufferedReader = new BufferedReader( new InputStreamReader(new FileInputStream(path), "UTF-8")); String data = null; while ((data = bufferedReader.readLine()) != null) { buffer.append(data+"\r\n"); } bufferedReader.close(); } catch (UnsupportedEncodingException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } return buffer.toString(); }} |
补充知识：java读取txt文件为List
文件在桌面放着名字为hello.txt,先看一下要读取的内容
这是为了方便展示demo随便写的，格式是一行一个英文单词，一共五个。
读取代码，这个代码也是网上找的，忘了哪个博客了。
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import java.io.*;import java.util.ArrayList;import java.util.List; /** * @author : * @date : 2018/8/30 * @description: */public class ReaderFileLine { /** * @author: * @date:2018/8/30 * @description:从txt文件读取List<String> */ public static List<String> getFileContent(String path) { List<String> strList = new ArrayList<String>(); File file = new File(path); InputStreamReader read = null; BufferedReader reader = null; try { read = new InputStreamReader(new FileInputStream(file),"utf-8"); reader = new BufferedReader(read); String line; while ((line = reader.readLine()) != null) { strList.add(line); } } catch (UnsupportedEncodingException e) { e.printStackTrace(); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } finally { if (read != null) { try { read.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } if (reader != null) { try { reader.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } return strList; } public static void main(String[] args) { List<String> fileContent = ReaderFileLine.getFileContent("C:\\Users\\Lenovo\\Desktop\\hello.txt"); for (String s : fileContent) { System.out.println(s); } } } |
输出：
first
second
Third
Fourth
Fifth
注意：
1.这里File这个类导入的包是Io的，不是Nio的
2. ReaderFileLine.getFileContent("C:\\Users\\Lenovo\\Desktop\\hello.txt"); 这个路径是绝对路径
3.路径是一个 反斜杠 \ 但是在代码里面反斜杠是转义的意思，所以需要再加一个\,如果你是用的IDEA恭喜你，它会自动给你加上
以上这篇java 将字符串、list 写入到文件,并读取内容的案例就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持服务器之家。
原文链接：https://blog.csdn.net/m0_37143081/article/details/88947035
