//=============================写文件package fier;import java.io.*;public class write {public static void main(String[] args) {
write("E:\\123.txt", "hello");
}public static void write(String path, String content) {
String s = new String();
String s1 = new String();
try {
File f = new File(path);
if (f.exists()) {
System.out.println("文件存在");
} else {
System.out.println("文件不存在,正在创建...");
if (f.createNewFile()) {
System.out.println("文件创建成功!");
} else {
System.out.println("文件创建失败!");
} }
BufferedReader input = new BufferedReader(new FileReader(f)); while ((s = input.readLine()) != null) {
s1 += s + "\n";
}
System.out.println("文件内容:" + s1);
input.close();
s1 += content; BufferedWriter output = new BufferedWriter(new FileWriter(f));
output.write(s1);
output.close();
} catch (Exception e) {
e.printStackTrace();
}
}}
//=============================读文件package fier;import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStreamReader;public class sdsd {/**
* @param args
*/
public static void main(String[] args) {
read("E:\\123.txt");
}public static void read(String file) {
String s = null;
StringBuffer sb = new StringBuffer();
File f = new File(file);
if (f.exists()) {
System.out.println("文件存在"); try {
BufferedReader br = new BufferedReader(new InputStreamReader(
new FileInputStream(f))); while ((s = br.readLine()) != null) {
sb.append(s);
}
System.out.println(sb);
} catch (Exception e) {
e.printStackTrace();
}
}else{
System.out.println("文件不存在!");
}
}
}
write("E:\\123.txt", "hello");
}public static void write(String path, String content) {
String s = new String();
String s1 = new String();
try {
File f = new File(path);
if (f.exists()) {
System.out.println("文件存在");
} else {
System.out.println("文件不存在,正在创建...");
if (f.createNewFile()) {
System.out.println("文件创建成功!");
} else {
System.out.println("文件创建失败!");
} }
BufferedReader input = new BufferedReader(new FileReader(f)); while ((s = input.readLine()) != null) {
s1 += s + "\n";
}
System.out.println("文件内容:" + s1);
input.close();
s1 += content; BufferedWriter output = new BufferedWriter(new FileWriter(f));
output.write(s1);
output.close();
} catch (Exception e) {
e.printStackTrace();
}
}}
//=============================读文件package fier;import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStreamReader;public class sdsd {/**
* @param args
*/
public static void main(String[] args) {
read("E:\\123.txt");
}public static void read(String file) {
String s = null;
StringBuffer sb = new StringBuffer();
File f = new File(file);
if (f.exists()) {
System.out.println("文件存在"); try {
BufferedReader br = new BufferedReader(new InputStreamReader(
new FileInputStream(f))); while ((s = br.readLine()) != null) {
sb.append(s);
}
System.out.println(sb);
} catch (Exception e) {
e.printStackTrace();
}
}else{
System.out.println("文件不存在!");
}
}
}
F:\JavaDemo>javac Write.java
Write.java:51: 需要为 class、interface 或 enum
package fier;
^
Write.java:53: 需要为 class、interface 或 enum
import java.io.BufferedReader;
^
Write.java:54: 需要为 class、interface 或 enum
import java.io.File;
^
Write.java:55: 需要为 class、interface 或 enum
import java.io.FileInputStream;
^
Write.java:56: 需要为 class、interface 或 enum
import java.io.FileNotFoundException;
^
Write.java:57: 需要为 class、interface 或 enum
import java.io.InputStreamReader;
^
6 错误F:\JavaDemo>Write.java:57: 需要为 class、interface 或 enum
import java.io.InputStreamReader;
^
6 错误F:\JavaDemo