本文实例总结了java中关于文本文件的读写方法。分享给大家供大家参考,具体如下:
写文本数据
方法 一:
import java.io.*;
public class A {
public static void main(String args[]) {
FileOutputStream out;
PrintStream ps;
try {
out = new FileOutputStream(\"a.txt\");
ps = new PrintStream(out);
ps.println(\"qun qun.\");
ps.println(\"fei fei\");
ps.close();
} catch (Exception e) {
System.out.println(e.toString());
}
}
}
方法 二:
import java.io.*;
public class B {
public static void main(String args[]) {
FileWriter fw;
PrintWriter pw;
try {
fw = new FileWriter(\"b.txt\");
pw = new PrintWriter(fw);
pw.print(\"qunqu n \");
pw.println(\"feiefi ss\");
pw.print(\"qunqu n \");
pw.close();
fw.close();
} catch (IOException e) {
System.out.println(e.toString());
}
}
}
方法三:
import java.io.*;
public class C {
public static void main(String args[]) {
String str_written = \"This is a simple example\";
try {
FileWriter fwriter = new FileWriter(\"c.txt\");
BufferedWriter bfwriter = new BufferedWriter(fwriter);
bfwriter.write(str_written, 0, str_written.length());
bfwriter.flush();
bfwriter.close();
} catch (IOException e) {
System.out.println(e.toString());
}
}
}
附注:方法一和方法二,方法三都是在操作文本文件不存在的时候将创建,否则,当覆盖之!
另;方法三
BufferedWriter将文本写入字符输出流,缓冲各个字符,从而提供单个字符、数组和字符串的高效写入。
附:追加写入:
import java.io.*;
public class C {
public static void main(String args[]) {
String str_written = \"This is a simple example\";
try {
FileWriter fwriter = new FileWriter(\"c.txt\", true);
BufferedWriter bfwriter = new BufferedWriter(fwriter);
bfwriter.newLine();
bfwriter.write(str_written, 0, str_written.length());
bfwriter.flush();
bfwriter.close();
} catch (IOException e) {
System.out.println(e.toString());
}
}
}
读文本数据
方法一:
import java.io.*;
public class A {
public static void main(String args[]) {
try {
FileInputStream fstream = new FileInputStream(\"a.txt\");
DataInputStream in = new DataInputStream(fstream);
while (in.available() != 0) {
String a = in.readLine();
System.out.println(a);
System.out.println(a.length());
}
in.close();
} catch (Exception e) {
System.out.println(e.toString());
}
}
}
方法二:
import java.io.*;
public class B {
public static void main(String args[]) {
try {
FileReader fr = new FileReader(\"a.txt\");
BufferedReader br = new BufferedReader(fr);
String str;
int count = 0;
while ((str = br.readLine()) != null) {
count++;
System.out.println(count + \" : \" + str);
}
br.close();
fr.close();
} catch (Exception e) {
System.out.println(e.toString());
}
}
}
附:方法二的能够高效的实现文本数据的读出
希望本文所述对大家Java程序设计有所帮助。
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