Java内置的实现序列化、反序列化、案例

﹏ヽ暗。殇╰゛Y 2024-02-18 23:13 35阅读 0赞

**摘要**：Java内置的实现序列化、反序列化、案例

#### 一：创建Maven工程，编写Java内置的序列化，反序列化方法 ####

package cn.micai.base.io;
    
    import java.io.*;
    
    /**
     * @Auther: zhaoxinguo
     * @Date: 2018/8/23 10:48
     * @Description: Java内置的实现序列化、反序列化
     */
    public class JavaSerializeDeserializeMain {
    
        /**
         * Java内置的实现序列化
         * @param employee
         * @return
         * @throws IOException
         */
        public static byte[] serialize(Employee employee){
            // 定义一个字节数组输出流
            ByteArrayOutputStream byteArrayOutputStream = null;
            // 对象输出流
            ObjectOutputStream objectOutputStream = null;
            try {
                byteArrayOutputStream = new ByteArrayOutputStream();
                objectOutputStream = new ObjectOutputStream(byteArrayOutputStream);
                // 将对象写入到字节数组输出，进行序列化
                objectOutputStream.writeObject(employee);
                return byteArrayOutputStream.toByteArray();
            } catch (IOException e) {
                e.printStackTrace();
            } finally {
                try {
                    byteArrayOutputStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
                try {
                    objectOutputStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return null;
        }
    
        /**
         * Java内置的实现反序列化
         * @param employeeArray
         * @return
         */
        public static Employee deserialize(byte[] employeeArray) {
            // 定义字节数组输入流
            ByteArrayInputStream byteArrayInputStream = null;
            // 执行反序列化，从流中读取对象
            ObjectInputStream objectInputStream = null;
            try {
                byteArrayInputStream = new ByteArrayInputStream(employeeArray);
                objectInputStream = new ObjectInputStream(byteArrayInputStream);
                return (Employee) objectInputStream.readObject();
            } catch (IOException e) {
                e.printStackTrace();
            } catch (ClassNotFoundException e) {
                e.printStackTrace();
            } finally {
                try {
                    byteArrayInputStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
                try {
                    objectInputStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return null;
        }
    
        public static void main(String [] args) {
    
            Employee employee = new Employee();
            employee.setEmployeeId(1);
            employee.setEmployeeName("赵新国");
            employee.setDepartment("软件工程师");
            // 序列化
            byte[] serialize = serialize(employee);
            System.out.println(serialize);
            // 反序列化
            Employee deserialize = deserialize(serialize);
            System.out.println(deserialize.toString());
    
        }
    
    }

#### 二：编写Employee对象 ####

package cn.micai.base.io;
    
    import java.io.Serializable;
    
    /**
     * 描述：
     * <p>
     *
     *     transient使用小结
     *     1.一旦变量被transient修饰，变量将不再是对象持久化的一部分，该变量内容在序列化后无法获得访问。
     *     2.transient关键字只能修饰变量，而不能修饰方法和类。注意，本地变量是不能被transient关键字修饰的。变量如果是用户自定义类变量，则该类需要实现Serializable接口。
     *     3.被transient关键字修饰的变量不再能被序列化，一个静态变量不管是否被transient修饰，均不能被序列化。
     *
     * @author: 赵新国
     * @date: 2018/6/7 12:10
     */
    public class Employee implements Serializable {
    
        private static final long serialVersionUID = 1L;
        private int employeeId;
        private String employeeName;
        /**
         * 使用transient关键字，表示该字段不序列化
         */
        private transient String department;
    
        public int getEmployeeId() {
            return employeeId;
        }
        public void setEmployeeId(int employeeId) {
            this.employeeId = employeeId;
        }
        public String getEmployeeName() {
            return employeeName;
        }
        public void setEmployeeName(String employeeName) {
            this.employeeName = employeeName;
        }
        public String getDepartment() {
            return department;
        }
        public void setDepartment(String department) {
            this.department = department;
        }
    
        @Override
        public String toString() {
            return "Employee{" +
                    "employeeId=" + employeeId +
                    ", employeeName='" + employeeName + '\'' +
                    ", department='" + department + '\'' +
                    '}';
        }
    }

#### 三：测试结果 ####

![70][]

**温馨提示**：这里反序列化以后，department字段为空，是因为在Employee对象里面对这个字段加了transient修饰符，该修饰符的作用就是该字段不序列化，所以反序列化后，该字段为空是正常的。

[70]: https://image.dandelioncloud.cn/pgy_files/images/2024/01/29/264df9875c7249a0a999b1a4570e5411.png