java开发之读写txt文件操作的实现

      2020-03-18 01:32      JAVA编程
本篇文章介绍了,java开发之读写txt文件操作的实现。需要的朋友参考下

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
复制代码 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;
}
}


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