Java IO & Serialization

專為開卷考試準(zhǔn)備，內(nèi)容包括基本的文本文件和二進(jìn)制文件的讀寫以及序列化反序列化操作

IO demo

package helloworld;import java.io.BufferedReader; import java.io.BufferedWriter; import java.io.DataInputStream; import java.io.DataOutputStream; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.FileReader; import java.io.FileWriter; import java.io.IOException;public class TestIO {public static void main(String[] args) {String fileName = "test.txt";try {FileWriter fWriter = new FileWriter(fileName);fWriter.write("你好\n");fWriter.write("Hello World");fWriter.close();// 帶緩沖的寫法，寫入大量內(nèi)容的時候可以更加高效一些BufferedWriter fWriter2 = new BufferedWriter(new FileWriter("test2.txt")); // 裝飾器模式fWriter2.write("加入buffer\n");fWriter2.write("Hi World");fWriter2.close();// 讀取文件BufferedReader fReader = new BufferedReader (new FileReader(fileName));StringBuffer content = new StringBuffer();String line;while ((line = fReader.readLine())!=null) {content.append(line);}System.out.println(content);// 你好\nHello WorldfReader.close();} catch (IOException e) {e.printStackTrace();}// 二進(jìn)制文件try {// 打開流DataOutputStream dataOutputStream = new DataOutputStream(new FileOutputStream("test.bin"));dataOutputStream.writeInt(123);dataOutputStream.writeUTF("方浩 the great");dataOutputStream.writeDouble(1234.56);dataOutputStream.close(); // 關(guān)閉流// 讀取二進(jìn)制文件DataInputStream dataInputStream = new DataInputStream(new FileInputStream("test.bin"));System.out.println(dataInputStream.readInt());System.out.println(dataInputStream.readUTF());System.out.println(dataInputStream.readDouble());dataInputStream.close();} catch (FileNotFoundException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}} }

Serialization demo

package helloworld;import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.ObjectInputStream; import java.io.ObjectOutputStream; import java.io.Serializable;// 要序列化的的對象需要實現(xiàn)序列化接口 class Employee implements Serializable {/*** */private static final long serialVersionUID = 1L;String name;String address;void mailCheck() {System.out.println("Mailing a check to " + name + " " + address);}}public class TestSerialization {public static void main(String[] args) {Employee employee = new Employee();employee.name = "Tim";employee.address = "Phokka Kuan, Ambehta Peer";// 序列化try {ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream("test.ser"));// 把對象存入文件out.writeObject(employee);out.close();} catch (FileNotFoundException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}// 反序列化try {ObjectInputStream in = new ObjectInputStream(new FileInputStream("test.ser"));Employee e = (Employee)in.readObject();in.close();e.mailCheck();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (ClassNotFoundException e) {// TODO Auto-generated catch blocke.printStackTrace();}} }

轉(zhuǎn)載于:https://www.cnblogs.com/fanghao/p/10883720.html

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