java读写txt文件请问用什么
import java。io。BufferedReader;
import java。io。File;
import java。io。FileReader;
import java。io。 FileWriter;
public class TxtFile {
public void read() {
FileReader fr = null;
BufferedReader br = null;
try {
fr = new FileReader("F://a。 txt");
br = new BufferedReader(fr);
String line = br。readLine()...全部
import java。io。BufferedReader;
import java。io。File;
import java。io。FileReader;
import java。io。
FileWriter;
public class TxtFile {
public void read() {
FileReader fr = null;
BufferedReader br = null;
try {
fr = new FileReader("F://a。
txt");
br = new BufferedReader(fr);
String line = br。readLine();
while (line != null) {
System。
out。println(line);
line = br。readLine();
}
} catch (Exception e) {
System。out。println(e);
} finally {
try {
if (br != null)
br。
close();
if (fr != null)
fr。close();// 关闭文件
} catch (Exception e) {
System。out。
println(e);
}
}
}
public void write() {
File file = null;
FileWriter fw = null;
try {
file = new File("F://a。
txt");
fw = new FileWriter(file);
for (int i = 0; i < 20; i++) {
fw。append("第" + i + 1 + "次");
}
} catch (Exception e) {
System。
out。println(e);
} finally {
try {
if (fw != null)
fw。close();// 关闭文件
} catch (Exception e) {
System。
out。println(e);
}
}
}
}
。收起
