java如何实现写入并保存txt文件？

实例代码如下：

package TEST;

import java.io.BufferedWriter;

import java.io.FileWriter;

import java.io.IOException;

public class BufferedWriterDemo {

public static void main(String[] args) throws IOException {

write("E:\\1.txt"); //运行主方法

}

public static void write(String path)

throws IOException {

//将写入转化为流的形式

BufferedWriter bw = new BufferedWriter(new FileWriter(path));

//一次写一行

String ss = "测试数据";

bw.write(ss);

bw.newLine(); //换行用

//关闭流

bw.close();

System.out.println("写入成功");

}

}

java创建txt文件并存入内容

import java.io.BufferedReader;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStreamReader;

import java.io.PrintWriter;

public class txtExport {

private static String path = "D:/";

private static String filenameTemp;

public static void main(String[] args) throws IOException {

txtExport.creatTxtFile("你好");

txtExport.writeTxtFile("你好");

}

/**

* 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;

}

}

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