将Java对象序列化成XML格式，将XML反序列化还原为Java对象

傷城~ 2024-02-18 23:13 61阅读 0赞

**摘要**：将Java对象序列化成XML格式，将XML反序列化还原为Java对象。

#### 一：创建Maven工程，引入xstream依赖： ####

<dependency>
          <groupId>com.thoughtworks.xstream</groupId>
          <artifactId>xstream</artifactId>
          <version>1.4.4</version>
        </dependency>

#### 二：创建Java序列化为XML格式、XML反序列化为Java对象的类： ####

package cn.micai.base.io;
    
    import com.thoughtworks.xstream.XStream;
    import com.thoughtworks.xstream.io.xml.DomDriver;
    
    import java.io.IOException;
    
    /**
     * @Auther: zhaoxinguo
     * @Date: 2018/8/23 10:48
     * @Description: 将Java对象序列化成XML格式，将XML反序列化还原为Java对象
     */
    public class XmlSerializeDeserializeMain {
    
        /**
         * 将Java对象序列化成XML格式
         * @param employee
         * @return
         * @throws IOException
         */
        public static String serialize(Employee employee){
            // 将employee对象序列化为XML
            XStream xStream = new XStream(new DomDriver());
            // 设置employee类的别名
            xStream.alias("employee", Employee.class);
            String personXml = xStream.toXML(employee);
            return personXml;
        }
    
        /**
         * 将XML反序列化还原为Java对象
         * @param personXml
         * @return
         */
        public static Employee deserialize(String personXml) {
            // 将employee对象序列化为XML
            XStream xStream = new XStream(new DomDriver());
            Employee employee = (Employee) xStream.fromXML(personXml);
            return employee;
        }
    
        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
            String serialize = serialize(employee);
            System.out.println(serialize);
            // 反序列化
            Employee deserialize = deserialize(serialize);
            System.out.println(deserialize.toString());
    
        }
    
    }

#### 三：创建Employee实体对象 ####

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 + '\'' +
                    '}';
        }
    }

#### 四：运行测试： ####

![70][]

#### 五：异常提醒： ####

上面的异常信息说明了，在解析XML的时候，找不到对应的实体对象，所以会报上面的错误，那我们就在解析的时候，告诉xStream，是解析那个对象，修改解析XML代码如下：

/**
         * 将XML反序列化还原为Java对象
         * @param personXml
         * @return
         */
        public static Employee deserialize(String personXml) {
            // 将employee对象序列化为XML
            XStream xStream = new XStream(new DomDriver());
            xStream.alias("employee", Employee.class);
            Employee employee = (Employee) xStream.fromXML(personXml);
            return employee;
        }

#### 六：最终运行结果： ####

![70 1][]

[70]: https://image.dandelioncloud.cn/pgy_files/images/2024/01/29/7df2e860dbfc415e97f0b3bad85f1e17.png
[70 1]: https://image.dandelioncloud.cn/pgy_files/images/2024/01/29/17f5f851981c49668e9bb8b3bc43bad7.png