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‎JavaIO.iml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<module org.jetbrains.idea.maven.project.MavenProjectsManager.isMavenModule="true" type="JAVA_MODULE" version="4">
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<component name="NewModuleRootManager" LANGUAGE_LEVEL="JDK_1_5">
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<output url="file://$MODULE_DIR$/target/classes" />
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<output-test url="file://$MODULE_DIR$/target/test-classes" />
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<content url="file://$MODULE_DIR$">
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<sourceFolder url="file://$MODULE_DIR$/src/main/java" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/src/main/resources" type="java-resource" />
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<sourceFolder url="file://$MODULE_DIR$/src/test/java" isTestSource="true" />
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<excludeFolder url="file://$MODULE_DIR$/target" />
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</content>
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<orderEntry type="inheritedJdk" />
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<orderEntry type="sourceFolder" forTests="false" />
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<orderEntry type="library" name="Maven: junit:junit:4.12" level="project" />
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<orderEntry type="library" name="Maven: org.hamcrest:hamcrest-core:1.3" level="project" />
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</component>
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</module>

‎pom.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>website.dengta</groupId>
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<artifactId>java-io</artifactId>
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<version>1.0-SNAPSHOT</version>
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<dependencies>
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<dependency>
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<groupId>junit</groupId>
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<artifactId>junit</artifactId>
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<version>RELEASE</version>
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</dependency>
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</dependencies>
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</project>

‎src/main/java/website/dengta/javaio/ExternalizableDemo.java‎

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package website.dengta.javaio;
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import java.io.*;
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/**
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* Created by Administrator on 2017/9/28.
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* <p>
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* 被Serializable接口声明的类的对象的属性都将被序列化，但是如果想自定义序列化的内容的时候，就需要实现Externalizable接口。
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* <p>
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* 当一个类要使用Externalizable这个接口的时候，这个类中必须要有一个无参的构造函数，如果没有的话，在构造的时候会产生异常，这是因为在反序列话的时候会默认调用无参的构造函数。
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*/
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public class ExternalizableDemo {
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public static void main(String[] args) throws Exception {
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ser(); // 序列化
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dser(); // 反序列话
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}
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public static void ser() throws Exception{
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File file = new File("d:" + File.separator + "hello.txt");
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ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream(
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file));
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out.writeObject(new PersonE("rollen", 20));
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out.close();
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}
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public static void dser() throws Exception{
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File file = new File("d:" + File.separator + "hello.txt");
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ObjectInputStream input = new ObjectInputStream(new FileInputStream(
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file));
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Object obj = input.readObject();
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input.close();
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System.out.println(obj);
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}
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/**
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* 当我们使用Serializable接口实现序列化操作的时候，如果一个对象的某一个属性不想被序列化保存下来，那么我们可以使用transient关键字进行说明：
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*/
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}

‎src/main/java/website/dengta/javaio/ObjectInputStreamDemo.java‎

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package website.dengta.javaio;
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import java.io.*;
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/**
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* Created by Administrator on 2017/9/28.
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*/
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public class ObjectInputStreamDemo {
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public static void main(String[] args) throws IOException, ClassNotFoundException {
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File file = new File("d:" + File.separator + "hello.txt");
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ObjectInputStream ois = new ObjectInputStream(new FileInputStream(file));
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Object obj = ois.readObject();
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ois.close();
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System.out.println(obj);
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}
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//对象序列化的反序列化
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/**
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* 打印代码如下：Person{name='dengta', age=1}
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*/
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}
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‎src/main/java/website/dengta/javaio/ObjectOutputStreamDemo.java‎

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package website.dengta.javaio;
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import java.io.*;
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/**
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* Created by Administrator on 2017/9/28.
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*/
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public class ObjectOutputStreamDemo {
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public static void main(String[] args) throws IOException{
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File file = new File("d:"+File.separator+"hello.txt");
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ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream(file));
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oos.writeObject(new Person("dengta",1));
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oos.close();
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}
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/**
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* 二进制文件不能查看，可使用ObjectInputStream类来查看
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*/
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}
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‎src/main/java/website/dengta/javaio/Person.java‎

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package website.dengta.javaio;
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import java.io.Serializable;
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/**
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* Created by Administrator on 2017/9/28.
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*/
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public class Person implements Serializable{
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private transient String name ;
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private int age;
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public Person() {
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}
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public Person(String name, int age) {
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this.name = name;
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this.age = age;
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}
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@Override
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public String toString() {
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return "Person{" +
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"name='" + name + '\'' +
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", age=" + age +
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'}';
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}
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}

‎src/main/java/website/dengta/javaio/PersonE.java‎

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package website.dengta.javaio;
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import java.io.Externalizable;
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import java.io.IOException;
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import java.io.ObjectInput;
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import java.io.ObjectOutput;
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/**
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* Created by Administrator on 2017/9/28.
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*/
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public class PersonE implements Externalizable{
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private String name ;
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private int age;
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public PersonE() {
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}
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public PersonE(String name, int age) {
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this.name = name;
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this.age = age;
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}
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@Override
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public String toString() {
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return "PersonE{" +
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"name='" + name + '\'' +
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", age=" + age +
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'}';
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}
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// 复写这个方法，根据需要可以保存的属性或者具体内容，在序列化的时候使用
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public void writeExternal(ObjectOutput out) throws IOException{
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out.writeObject(this.name);
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out.writeInt(age);
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}
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// 复写这个方法，根据需要读取内容 反序列话的时候需要
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public void readExternal(ObjectInput in) throws IOException,
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ClassNotFoundException{
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this.name = (String) in.readObject();
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this.age = in.readInt();
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}
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}

‎src/main/java/website/dengta/javaio/SerObjectDemo.java‎

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package website.dengta.javaio;
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import java.io.*;
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/**
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* Created by Administrator on 2017/9/28.
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*/
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public class SerObjectDemo {
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public static void main(String[] args) throws Exception{
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Student[] stu = { new Student("hello", 20), new Student("world", 30),
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new Student("rollen", 40) };
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ser(stu);
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Object[] obj = dser();
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for(int i = 0; i < obj.length; ++i){
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Student s = (Student) obj[i];
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System.out.println(s);
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}
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}
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// 序列化
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public static void ser(Object[] obj) throws Exception{
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File file = new File("d:" + File.separator + "hello.txt");
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ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream(
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file));
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out.writeObject(obj);
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out.close();
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}
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// 反序列化
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public static Object[] dser() throws Exception{
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File file = new File("d:" + File.separator + "hello.txt");
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ObjectInputStream input = new ObjectInputStream(new FileInputStream(
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file));
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Object[] obj = (Object[]) input.readObject();
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input.close();
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return obj;
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}
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}
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class Student implements Serializable{
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public Student(){
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}
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public Student(String name, int age){
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this.name = name;
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this.age = age;
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}
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@Override
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public String toString(){
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return "姓名： " + name + " 年龄：" + age;
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}
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private String name;
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private int age;
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}
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