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import java.io.BufferedReader;
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import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
public class IOTest {
public static void main(String[] args) {
String str = "123\r\n456";
writeFile(str);//写
String str1 = readFile();//读
System.out.println(str1);
}
/**
* 传递写的内容
* @param str
*/
static void writeFile(String str) {
try {
File file = new File("d:\\file.txt");
if(file.exists()){//存在
file.delete();//删除再建
file.createNewFile();
}else{
file.createNewFile();//不存在直接创建
}
FileWriter fw = new FileWriter(file);//文件写IO
fw.write(str);
fw.flush();
fw.close();
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* 返回读取的内容
* @return
*/
static String readFile() {
String str = "", temp = null;
try {
File file = new File("d:\\file.txt");
FileReader fr = new FileReader(file);
BufferedReader br = new BufferedReader(fr);//文件读IO
while((temp = br.readLine())!=null){//读到结束为止
str += (temp+"\n");
}
br.close();
fr.close();
} catch (IOException e) {
e.printStackTrace();
}
return str;
}
}
刚写的,够朋友好好学习一下啦,呵呵
多多看API,多多练习
java文件追加内容的三种方法:
方法一:
public static void writeToTxtByRandomAccessFile(File file, String str){
RandomAccessFile randomAccessFile = null;
try {
randomAccessFile = new RandomAccessFile(file,"rw");
long len = randomAccessFile.length();
randomAccessFile.seek(len);
randomAccessFile.writeBytes(new String(str.getBytes(),"iso8859-1")+"\r\n");
} catch (FileNotFoundException e) {
e.printStackTrace();
}catch (IOException e) {
e.printStackTrace();
}finally{
try {
randomAccessFile.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
方法二:
public static void writeToTxtByFileWriter(File file, String content){
BufferedWriter bw = null;
try {
FileWriter fw = new FileWriter(file, true);
bw = new BufferedWriter(fw);
bw.write(content);
} catch (IOException e) {
e.printStackTrace();
}finally{
try {
bw.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
方法三:
public static void writeToTxtByOutputStream(File file, String content){
BufferedOutputStream bufferedOutputStream = null;
try {
bufferedOutputStream = new BufferedOutputStream(new FileOutputStream(file, true));
bufferedOutputStream.write(content.getBytes());
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch(IOException e ){
e.printStackTrace();
}finally{
try {
bufferedOutputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
java追加写入txt文件代码及注释参考如下:
public void m() {
FileWriter ff= null;
try {
//查看C盘是否有a.txt文件来判定是否创建
File f=new File("c:\\a.txt");
ff = new FileWriter(f, true);//将字节写入文件末尾处,相当于追加信息。
} catch (IOException e) {
e.printStackTrace();
}
PrintWriter p = new PrintWriter(ff);
p.println("这里就可以写入要追加的内容了");//此处为追加内容
p.flush();
ff.try {
f.flush();
p.close();
ff.close();
} catch (IOException e) {
e.printStackTrace();
}
}
向txt文件写入内容基本思路就是获得一个file对象,新建一个txt文件,打开I/O操作流,使用写入方法进行读写内容,示例如下:
package common;
import java.io.*;
import java.util.ArrayList;
public class IOTest {
public static void main (String args[]) {
ReadDate();
WriteDate();
}
/**
* 读取数据
*/
public static void ReadDate() {
String url = “e:/2.txt”;
try {
FileReader read = new FileReader(new File(url));
StringBuffer sb = new StringBuffer();
char ch[] = new char[1024];
int d = read.read(ch);
while(d!=-1){
String str = new String(ch,0,d);
sb.append(str);
d = read.read(ch);
}
System.out.print(sb.toString());
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* 写入数据
*/
public static void WriteDate() {
try{
File file = new File(“D:/abc.txt”);
if (file.exists()) {
file.delete();
}
file.createNewFile();
BufferedWriter output = new BufferedWriter(new FileWriter(file));
ArrayList ResolveList = new ArrayList();
for (int i = 0; i 10; i++) {
ResolveList.add(Math.random()* 100);
}
for (int i=0 ;i
output.write(String.valueOf(ResolveList.get(i)) + “\n”);
}
output.close();
} catch (Exception ex) {
System.out.println(ex);
}
}
}
原文出自【比特网】,转载请保留原文链接:
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintStream;
// 在当前路径(默认)创建3个非空.doc(当然也可以是.txt,.java…)文件
public class FileTest
{
//遇到异常抛给Java虚拟机处理
public static void main(String[] args)throws IOException
{
//i-1,恒为true,创建无限文件,就成病毒了
for (int i = 0; i 3; i++)
{
//指定要要输入内容的文件名name
String name = "a" + i + ".doc";
//定义一个节点输出流FilOutputStream
//通俗点:定义一个水管,水管通向name文件
FileOutputStream out = new FileOutputStream(name);
//使用PrintStream包装该节点流,使用PrintStream来输出字符串
//通俗点:给水管加个水龙头(PrintStream),这个水龙头具有放水功能(ps.print())
PrintStream ps = new PrintStream(out);
ps.print("我我我窝窝窝窝窝窝窝窝哦我");
ps.append("你");
}
}
}
一切尽在代码里!
如下代码,向D盘temp文件夹下的 test.txt 文件中写入 Hello World!
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
public class App {
public static void main(String[] args) throws IOException {
File file = new File("d:\\temp\\test.txt");
try ( FileOutputStream outputStream = new FileOutputStream(file);
OutputStreamWriter streamWriter = new OutputStreamWriter(outputStream) ) {
streamWriter.write("Hello World!");
streamWriter.flush();
}
}
}