【转】java读写文件
//=============================写文件package fier;import java.io.*;public class write {public static void main(String[] args) { write("E:\\123.txt", "hello");}public static void write(String path, String content) { String s = new String(); String s1 = new String(); try { File f = new File(path); if (f.exists()) { System.out.println("文件存在"); } else { System.out.println("文件不存在，正在创建..."); if (f.createNewFile()) { System.out.println("文件创建成功！"); } else { System.out.println("文件创建失败！"); } } BufferedReader input = new BufferedReader(new FileReader(f)); while ((s = input.readLine()) != null) { s1 += s + "\n"; } System.out.println("文件内容：" + s1); input.close(); s1 += content; BufferedWriter output = new BufferedWriter(new FileWriter(f)); output.write(s1); output.close(); } catch (Exception e) { e.printStackTrace(); }}}//=============================读文件package fier;import java.io.BufferedReader;import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.InputStreamReader;public class sdsd {/** * @param args */public static void main(String[] args) { read("E:\\123.txt");}public static void read(String file) { String s = null; StringBuffer sb = new StringBuffer(); File f = new File(file); if (f.exists()) { System.out.println("文件存在"); try { BufferedReader br = new BufferedReader(new InputStreamReader( new FileInputStream(f))); while ((s = br.readLine()) != null) { sb.append(s); } System.out.println(sb); } catch (Exception e) { e.printStackTrace(); } }else{ System.out.println("文件不存在!"); }}}?