java开发之读写txt文件操作的实现
项目结构：
运行效果：
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下面是代码部分：
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/Text/src/com/b510/txt/MyFile.java
以上是 java开发之读写txt文件操作的实现 的全部内容， 来源链接： utcz.com/p/208008.html
代码如下:
package com.b510.txt; import java.io.BufferedReader; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.FileReader; import java.io.IOException; import java.io.InputStreamReader; import java.io.PrintWriter; /** * @author Hongten * * @time 2011-12-12 2011 */ public class MyFile { @SuppressWarnings("static-access") public static void main(String[] args) { MyFile myFile = new MyFile(); try { for (int i = 0; i < 5; i++) { myFile.creatTxtFile("test"); myFile.writeTxtFile("显示的是追加的信息" + i); String str = myFile.readDate(); System.out.println("*********\n" + str); } } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } private static String path = "txt/"; private static String filenameTemp; /** * 创建文件 * * @throws IOException */ public static boolean creatTxtFile(String name) throws IOException { boolean flag = false; filenameTemp = path + name + ".txt"; File filename = new File(filenameTemp); if (!filename.exists()) { filename.createNewFile(); flag = true; } return flag; } /** * 写文件 * * @param newStr * 新内容 * @throws IOException */ public static boolean writeTxtFile(String newStr) throws IOException { // 先读取原有文件内容，然后进行写入操作 boolean flag = false; String filein = newStr + "\r\n"; String temp = ""; FileInputStream fis = null; InputStreamReader isr = null; BufferedReader br = null; FileOutputStream fos = null; PrintWriter pw = null; try { // 文件路径 File file = new File(filenameTemp); // 将文件读入输入流 fis = new FileInputStream(file); isr = new InputStreamReader(fis); br = new BufferedReader(isr); StringBuffer buf = new StringBuffer(); // 保存该文件原有的内容 for (int j = 1; (temp = br.readLine()) != null; j++) { buf = buf.append(temp); // System.getProperty("line.separator") // 行与行之间的分隔符 相当于“\n” buf = buf.append(System.getProperty("line.separator")); } buf.append(filein); fos = new FileOutputStream(file); pw = new PrintWriter(fos); pw.write(buf.toString().toCharArray()); pw.flush(); flag = true; } catch (IOException e1) { // TODO 自动生成 catch 块 throw e1; } finally { if (pw != null) { pw.close(); } if (fos != null) { fos.close(); } if (br != null) { br.close(); } if (isr != null) { isr.close(); } if (fis != null) { fis.close(); } } return flag; } /** * 读取数据 */ public void readData1() { try { FileReader read = new FileReader(filenameTemp); BufferedReader br = new BufferedReader(read); String row; while ((row = br.readLine()) != null) { System.out.println(row); } } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } public String readDate() { // 定义一个待返回的空字符串 String strs = ""; try { FileReader read = new FileReader(new File(filenameTemp)); StringBuffer sb = new StringBuffer(); char ch[] = new char[1024]; int d = read.read(ch); while (d != -1) { String str = new String(ch, 0, d); sb.append(str); d = read.read(ch); } System.out.print(sb.toString()); String a = sb.toString().replaceAll("@@@@@", ","); strs = a.substring(0, a.length() - 1); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } return strs; } }
