内江建网站,南京建设监理协会网站,网络设备互联课设建设企业网站,中国兰州文章目录 Buffered流拷贝二进制文件创建文件写入文本读取文本文件存读Properties文件 Buffered流拷贝二进制文件
package com.hspedu.chapter19.outputStream;import java.io.*;public class BufferedCopy02 {public static void main(String[] args) {String srcFilePath import java.io.*;public class BufferedCopy02 {public static void main(String[] args) {String srcFilePath c:\\bh.jpg;String destFilePath c:\\hsp.jpg;BufferedInputStream bis null;BufferedOutputStream bos null;try {bis new BufferedInputStream(new FileInputStream(srcFilePath));bos new BufferedOutputStream(new FileOutputStream(destFilePath));byte[] buff new byte[1024];int readLen 0;while ((readLen bis.read(buff)) ! -1) {bos.write(buff, 0, readLen);}System.out.println(Copied successfully..);} catch (IOException e) {throw new RuntimeException(e);} finally {try {bis.close();bos.close();} catch (IOException e) {throw new RuntimeException(e);}}}
}
创建文件写入文本 import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;public class Homework01 {public static void main(String[] args) throws IOException {String filePath c:\\mydir;File file new File(filePath);if (!file.exists()) {if (file.mkdirs())System.out.println(filePath has been created successfully..);elseSystem.out.println(filePath was fail to be created..);} else {System.out.println(filePath has already existed..);}String destfile filePath \\hello.txt;File file1 new File(destfile);if (!file1.exists()) {if (file1.createNewFile()) {BufferedWriter bufferedWriter new BufferedWriter(new FileWriter(file1));bufferedWriter.write(hello, world~~ 韩顺平教育);bufferedWriter.close();System.out.println(destfile has been created successfully..);} else {System.out.println(destfile has already existed..);}} else {System.out.println(destfile has already existed..);}}
}
读取文本文件 public class Homework02 {public static void main(String[] args) throws IOException {String filePath c:\\hello.txt;String line ;int lineNum 0;BufferedReader bufferedReader new BufferedReader(new FileReader(filePath));while ((line bufferedReader.readLine()) ! null) {System.out.println(lineNum line);}if (bufferedReader ! null)bufferedReader.close();}
}public class Homework02 {public static void main(String[] args) throws IOException {String filePath c:\\hello.txt;// InputStreamReader指定编码方式InputStreamReader isr new InputStreamReader(new FileInputStream(filePath), gbk);String line ;int lineNum 0;BufferedReader bufferedReader new BufferedReader(isr);while ((line bufferedReader.readLine()) ! null) {System.out.println(lineNum line);}if (bufferedReader ! null)bufferedReader.close();}
}存读Properties文件 public class Homework03 {public static void main(String[] args) throws IOException {String filePath src\\dog.properties;Properties properties new Properties();properties.load(new FileReader(filePath));String name properties.get(name) ; //Object - Stringint age Integer.parseInt(properties.get(age) );// Object - intString color properties.get(color) ;//Object - StringDog dog new Dog(name, age, color);System.out.println(dog对象信息);System.out.println(dog);//将创建的Dog 对象 序列化到 文件 dog.dat 文件String serFilePath c:\\dog.dat;ObjectOutputStream oos new ObjectOutputStream(new FileOutputStream(serFilePath));oos.writeObject(dog);//关闭流oos.close();System.out.println(dog对象序列化完成...);}//在编写一个方法反序列化dogTestpublic void m1() throws IOException, ClassNotFoundException {String serFilePath e:\\dog.dat;ObjectInputStream ois new ObjectInputStream(new FileInputStream(serFilePath));Dog dog (Dog)ois.readObject();System.out.println(反序列化后 dog);System.out.println(dog);ois.close();}
}class Dog implements Serializable{private String name;private int age;private String color;public Dog(String name, int age, String color) {this.name name;this.age age;this.color color;}Overridepublic String toString() {return Dog{ name name \ , age age , color color \ };}
}
