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;
}
}
以上是 java实现写入并保存txt文件的代码详解 的全部内容, 来源链接: utcz.com/z/318122.html