java实现写入并保存txt文件的代码详解
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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