XStream学习手册
2020-06-04 16:03:04来源:博客园 阅读 ()
XStream学习手册
来XStream了解一下!?
一、前言
1、XStream官网
http://x-stream.github.io
2、XStream是什么
XStream是一个简单的基于Java的类库,用来将Java对象序列化成XML(JSON)或反序列化为对象(即:可以轻易的将Java对象和XML文档相互转换)
3、XSteam能干什么
XStream在运行时使用Java反射机制对要进行序列化的对象树的结构进行探索,并不需要对对象作出修改。XStream可以序列化内部字段,包括私private和final字段,并且支持非公开类以及内部类。
在缺省情况下,XStream不需要配置映射关系,对象和字段将映射为同名XML元素。但是当对象和字段名与XML中的元素名不同时,XStream支持指定别名。XStream支持以方法调用的方式,或是Java 标注的方式指定别名。
XStream在进行数据类型转换时,使用系统缺省的类型转换器。同时,也支持用户自定义的类型转换器。
4、XStream特点
-
使用方便 - XStream的API提供了一个高层次外观,以简化常用的用例
-
无需创建映射 - XStream的API提供了默认的映射大部分对象序列化
-
性能 - XStream快速和低内存占用,适合于大对象图或系统
-
干净的XML - XStream创建一个干净和紧凑XML结果,这很容易阅读
-
不需要修改对象 - XStream可序列化的内部字段,如private和final字段,支持非公开类和内部类。默认构造函数不是强制性的要求
-
完整对象图支持 - XStream允许保持在对象模型中遇到的重复引用,并支持循环引用
-
可自定义的转换策略 - 定制策略可以允许特定类型的定制被表示为XML的注册
-
安全框架 - XStream提供了一个公平控制有关解组的类型,以防止操纵输入安全问题
-
错误消息 - 出现异常是由于格式不正确的XML时,XStream抛出一个统一的例外,提供了详细的诊断,以解决这个问题
-
另一种输出格式 - XStream支持其它的输出格式,如JSON
5、XStream常见的用途
传输、持久化、配置、单元测试
二、XStream入门
1、添加XSteam依赖
<dependency>
<groupId>com.thoughtworks.xstream</groupId>
<artifactId>xstream</artifactId>
<version>1.4.12</version>
</dependency>
<dependency>
<groupId>org.codehaus.jettison</groupId>
<artifactId>jettison</artifactId>
<version>1.4.1</version>
</dependency>
2、XStream基本使用
package io.github.xstream.test01;
?
import com.thoughtworks.xstream.XStream;
import com.thoughtworks.xstream.io.json.JettisonMappedXmlDriver;
import lombok.AllArgsConstructor;
import lombok.ToString;
?
public class XStreamTest01 {
public static void main(String[] args) {
Student student = new Student("张三", 20);
XStream xStream = new XStream();//需要XPP3库
//XStream xStream = new XStream(new DomDriver());//不需要XPP3库
//XStream xStream = new XStream(new StaxDriver());//不需要XPP3库开始使用Java 6
//XML序列化
String xml = xStream.toXML(student);
System.out.println(xml);
//XML反序列化
student = (Student) xStream.fromXML(xml);
System.out.println(student);
?
xStream = new XStream(new JettisonMappedXmlDriver());
xStream.setMode(XStream.NO_REFERENCES);
//Json序列化
String json = xStream.toXML(student);
System.out.println(json);
//Json反序列
student = (Student) xStream.fromXML(json);
System.out.println(student);
}
}
?
@AllArgsConstructor
@ToString
class Student {
private String name;
private int age;
}
3、程序运行结果
<io.github.xstream.test01.Student>
<name>张三</name>
<age>20</age>
</io.github.xstream.test01.Student>
Security framework of XStream not initialized, XStream is probably vulnerable.
Student(name=张三, age=20)
{"io.github.xstream.test01.Student":{"name":"张三","age":20}}
Student(name=张三, age=20)
Security framework of XStream not initialized, XStream is probably vulnerable.
注意:文中使用到的Lombok注解,Lombok依赖自行添加;XStream序列化XML时需要引用的jar包:xstream-[version].jar、xpp3-[version].jar、xmlpull-[version].jar,当引入xstream依赖后会自动依赖xpp3、xmlpull依赖。XStream序列化JSON需要引用的jar包:jettison-[version].jar。
使用XStream序列化时,对JavaBean没有任何限制。JavaBean的字段可以是私有的,也可以没有getter或setter方法,还可以没有默认的构造函数。
XStream序列化XML时可以允许用户使用不同的XML解析器,用户可以使用一个标准的JAXP DOM解析器或自Java 6集成STAX解析器。这样用户就不需要依赖xpp3-[version].jar。
三、XStream混叠
1、混叠是一种技术来定制生成XML或者使用XStream特定的格式化XML。假设,一个下面的XML格式是用于序列化/反序列化Student对象。
<student name="张三">
<phone>
<brand>小米</brand>
<description>小米手机的描述</description>
</phone>
<phone>
<brand>苹果</brand>
<description>苹果手机的描述</description>
</phone>
</student>
2、根椐上面的XML格式,我们创建实体类
@AllArgsConstructor
@ToString
class Student {
private String studentName;
private List<Phone> phones;
}
?
@AllArgsConstructor
@ToString
class Phone {
private String brand;
private String description;
}
3、执行代码
package io.github.xstream.test02;
?
import com.thoughtworks.xstream.XStream;
import lombok.AllArgsConstructor;
import lombok.ToString;
?
import java.util.ArrayList;
import java.util.List;
?
public class XStreamTest02 {
public static void main(String[] args) {
List<Phone> phones = new ArrayList<>();
phones.add(new Phone("小米手机", "小米手机的描述"));
phones.add(new Phone("苹果手机", "苹果手机的描述"));
Student student = new Student("张三", phones);
?
XStream xStream = new XStream();//需要XPP3库
//XML序列化
String xml = xStream.toXML(student);
System.out.println(xml);
}
}
?
@AllArgsConstructor
@ToString
class Student {
private String studentName;
private List<Phone> phones;
}
?
@AllArgsConstructor
@ToString
class Phone {
private String brand;
private String description;
}
4、验证输出
<io.github.xstream.test02.Student>
<studentName>张三</studentName>
<phones>
<io.github.xstream.test02.Phone>
<brand>小米手机</brand>
<description>小米手机的描述</description>
</io.github.xstream.test02.Phone>
<io.github.xstream.test02.Phone>
<brand>苹果手机</brand>
<description>苹果手机的描述</description>
</io.github.xstream.test02.Phone>
</phones>
</io.github.xstream.test02.Student>
在上面的结果,我们已经看到了Student对象名称是完全合格的。要替换它作为学生的标签,按照四、XStream类混叠的步骤
另外,在上述结果中可以看出,所需studentName要重命名来命名。要替换它,按照五、XStream字段混叠的步骤
在上面的结果,我们可以看到手机标记被添加成为手机列表。替换它,按照六、XStream隐式集合混叠的步骤
在上面的结果,我们可以看到这个名字来作为一个子节点,需要将它作为根节点的属性。替换它,按照七、XStream属性混叠的步骤
四、XStream类混叠
1、类混叠是用来创建一个类的XML完全限定名称的别名。让我们修改XStreamTest02例子,将下面的代码添加到XStreamTest02例子里面
xStream.alias("student", Person02.class);
xStream.alias("phone", Phone.class);
2、执行代码
package io.github.xstream.test02;
?
import com.thoughtworks.xstream.XStream;
import lombok.AllArgsConstructor;
import lombok.ToString;
?
import java.util.ArrayList;
import java.util.List;
?
public class XStreamTest02 {
public static void main(String[] args) {
List<Phone> phones = new ArrayList<>();
phones.add(new Phone("小米手机", "小米手机的描述"));
phones.add(new Phone("苹果手机", "苹果手机的描述"));
Student student = new Student("张三", phones);
?
XStream xStream = new XStream();//需要XPP3库
xStream.alias("student", Student.class);
xStream.alias("phone", Phone.class);
?
//XML序列化
String xml = xStream.toXML(student);
System.out.println(xml);
}
}
?
@AllArgsConstructor
@ToString
class Student {
private String studentName;
private List<Phone> phones;
}
?
@AllArgsConstructor
@ToString
class Phone {
private String brand;
private String description;
}
3、执行结果
<student>
<studentName>张三</studentName>
<phones>
<phone>
<brand>小米手机</brand>
<description>小米手机的描述</description>
</phone>
<phone>
<brand>苹果手机</brand>
<description>苹果手机的描述</description>
</phone>
</phones>
</student>
可以看到<io.github.xstream.test02.Student>和<io.github.xstream.test02.Phone>分别被修改为了<student>和<phone>
五、XStream字段混叠
1、字段混叠用于创建以XML字段的别名。让我们再次修改原来的XStreamTest02例子,将下面的代码添加到XStreamTest02例子里面
xStream.aliasField("name", Student.class, "studentName");
2、执行代码
package io.github.xstream.test02;
?
import com.thoughtworks.xstream.XStream;
import lombok.AllArgsConstructor;
import lombok.ToString;
?
import java.util.ArrayList;
import java.util.List;
?
public class XStreamTest02 {
public static void main(String[] args) {
List<Phone> phones = new ArrayList<>();
phones.add(new Phone("小米手机", "小米手机的描述"));
phones.add(new Phone("苹果手机", "苹果手机的描述"));
Student student = new Student("张三", phones);
?
XStream xStream = new XStream();//需要XPP3库
xStream.alias("student", Student.class);
xStream.alias("phone", Phone.class);
xStream.aliasField("name", Student.class, "studentName");
?
//XML序列化
String xml = xStream.toXML(student);
System.out.println(xml);
}
}
?
@AllArgsConstructor
@ToString
class Student {
private String studentName;
private List<Phone> phones;
}
?
@AllArgsConstructor
@ToString
class Phone {
private String brand;
private String description;
}
3、执行结果
<student>
<name>张三</name>
<phones>
<phone>
<brand>小米手机</brand>
<description>小米手机的描述</description>
</phone>
<phone>
<brand>苹果手机</brand>
<description>苹果手机的描述</description>
</phone>
</phones>
</student>
可以看到<studentName>被修改为了<name>
六、XStream隐式集合混叠
1、隐式集合混叠时使用的集合是表示在XML无需显示根。例如,在我们的例子中,我们需要一个接一个,但不是在根节点来显示每一个节点。让我们再次修改原来的XStreamTest02例子,将下面的代码添加到XStreamTest02例子里面
xStream.addImplicitCollection(Student.class, "phones");
2、执行代码
package io.github.xstream.test02;
?
import com.thoughtworks.xstream.XStream;
import lombok.AllArgsConstructor;
import lombok.ToString;
?
import java.util.ArrayList;
import java.util.List;
?
public class XStreamTest02 {
public static void main(String[] args) {
List<Phone> phones = new ArrayList<>();
phones.add(new Phone("小米手机", "小米手机的描述"));
phones.add(new Phone("苹果手机", "苹果手机的描述"));
Student student = new Student("张三", phones);
?
XStream xStream = new XStream();//需要XPP3库
xStream.alias("student", Student.class);
xStream.alias("phone", Phone.class);
xStream.aliasField("name", Student.class, "studentName");
xStream.addImplicitCollection(Student.class, "phones");
?
//XML序列化
String xml = xStream.toXML(student);
System.out.println(xml);
}
}
?
@AllArgsConstructor
@ToString
class Student {
private String studentName;
private List<Phone> phones;
}
?
@AllArgsConstructor
@ToString
class Phone {
private String brand;
private String description;
}
3、执行结果
<student>
<name>张三</name>
<phone>
<brand>小米手机</brand>
<description>小米手机的描述</description>
</phone>
<phone>
<brand>苹果手机</brand>
<description>苹果手机的描述</description>
</phone>
</student>
可以看到<phones>被隐藏了
七、XStream属性混叠
1、属性混叠用于创建一个成员变量作为XML属性序列化。让我们再次修改原来的XStreamTest02例子,将下面的代码添加到XStreamTest02例子里面
xStream.useAttributeFor(Student.class, "studentName");
2、执行代码
package io.github.xstream.test02;
?
import com.thoughtworks.xstream.XStream;
import lombok.AllArgsConstructor;
import lombok.ToString;
?
import java.util.ArrayList;
import java.util.List;
?
public class XStreamTest02 {
public static void main(String[] args) {
List<Phone> phones = new ArrayList<>();
phones.add(new Phone("小米手机", "小米手机的描述"));
phones.add(new Phone("苹果手机", "苹果手机的描述"));
Student student = new Student("张三", phones);
?
XStream xStream = new XStream();//需要XPP3库
xStream.alias("student", Student.class);
xStream.alias("phone", Phone.class);
xStream.aliasField("name", Student.class, "studentName");
xStream.addImplicitCollection(Student.class, "phones");
xStream.useAttributeFor(Student.class, "studentName");
?
//XML序列化
String xml = xStream.toXML(student);
System.out.println(xml);
}
}
?
@AllArgsConstructor
@ToString
class Student {
private String studentName;
private List<Phone> phones;
}
?
@AllArgsConstructor
@ToString
class Phone {
private String brand;
private String description;
}
3、执行结果
<student name="张三">
<phone>
<brand>小米手机</brand>
<description>小米手机的描述</description>
</phone>
<phone>
<brand>苹果手机</brand>
<description>苹果手机的描述</description>
</phone>
</student>
可以看到<name>被作为了<student>的属性
八、XStream包混叠
1、包混叠用于创建一个类XML的完全限定名称的别名到一个新的限定名称。让我们再次修改原来的XStreamTest02例子,将下面代码
xStream.alias("student", Student.class);
xStream.alias("phone", Phone.class);
修改为
xStream.aliasPackage("xx.xx.xx.xx", "io.github.xstream.test02");
2、执行代码
package io.github.xstream.test02;
?
import com.thoughtworks.xstream.XStream;
import lombok.AllArgsConstructor;
import lombok.ToString;
?
import java.util.ArrayList;
import java.util.List;
?
public class XStreamTest02 {
public static void main(String[] args) {
List<Phone> phones = new ArrayList<>();
phones.add(new Phone("小米手机", "小米手机的描述"));
phones.add(new Phone("苹果手机", "苹果手机的描述"));
Student student = new Student("张三", phones);
?
XStream xStream = new XStream();//需要XPP3库
// xStream.alias("student", Student.class);
// xStream.alias("phone", Phone.class);
xStream.aliasPackage("xx.xx.xx.xx", "io.github.xstream.test02");
xStream.aliasField("name", Student.class, "studentName");
xStream.addImplicitCollection(Student.class, "phones");
xStream.useAttributeFor(Student.class, "studentName");
?
//XML序列化
String xml = xStream.toXML(student);
System.out.println(xml);
}
}
?
@AllArgsConstructor
@ToString
class Student {
private String studentName;
private List<Phone> phones;
}
?
@AllArgsConstructor
@ToString
class Phone {
private String brand;
private String description;
}
3、执行结果
<xx.xx.xx.xx.Student name="张三">
<xx.xx.xx.xx.Phone>
<brand>小米手机</brand>
<description>小米手机的描述</description>
</xx.xx.xx.xx.Phone>
<xx.xx.xx.xx.Phone>
<brand>苹果手机</brand>
<description>苹果手机的描述</description>
</xx.xx.xx.xx.Phone>
</xx.xx.xx.xx.Student>
可以看到包名由io.github.xstream.test02替换为了xx.xx.xx.xx
九、XStream注解
1、前面的四、五、六、七、八步骤都是通过代码操作的
//xStream.alias("student", Student.class);
//xStream.alias("phone", Phone.class);
xStream.aliasPackage("xx.xx.xx.xx", "io.github.xstream.test02");
xStream.aliasField("name", Student.class, "studentName");
xStream.addImplicitCollection(Student.class, "phones");
xStream.useAttributeFor(Student.class, "studentName");
2、XStream同时也支持注解,使用注解会变得简单也会达到相同的效果
package io.github.xstream.test03;
?
import com.thoughtworks.xstream.XStream;
import com.thoughtworks.xstream.annotations.*;
import com.thoughtworks.xstream.converters.basic.BooleanConverter;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.ToString;
?
import java.util.ArrayList;
import java.util.List;
?
public class XStreamTest03 {
public static void main(String[] args) {
List<Phone> phones = new ArrayList<>();
phones.add(new Phone("小米手机", "小米手机的描述"));
phones.add(new Phone("苹果手机", "苹果手机的描述"));
Student student = new Student("张三", phones, 20, true);
XStream xStream = new XStream();//需要XPP3库
//xStream.processAnnotations(new Class[]{Student.class});
xStream.autodetectAnnotations(true);
//XML序列化
String xml = xStream.toXML(student);
System.out.println(xml);
}
}
?
@AllArgsConstructor
@ToString
//别名注解
@XStreamAlias("student")
class Student {
@XStreamAlias("name")
//把字段节点设置成属性
@XStreamAsAttribute
private String studentName;
//省略集合根节点
@XStreamImplicit
private List<Phone> phones;
//隐藏字段
@XStreamOmitField
private int age;
//设置转换器
@XStreamConverter(value = BooleanConverter.class, booleans = {false}, strings = {"男", "女"})
private boolean sex;
}
?
@AllArgsConstructor
@ToString
@XStreamAlias("phone")
class Phone {
private String brand;
private String description;
}
3、使用注解的话,需要XML序列化之前添加如下代码
xStream.autodetectAnnotations(true);
或者
xStream.processAnnotations(new Class[]{Student.class});
4、执行结果
<student name="张三">
<phone>
<brand>小米手机</brand>
<description>小米手机的描述</description>
</phone>
<phone>
<brand>苹果手机</brand>
<description>苹果手机的描述</description>
</phone>
<sex>男</sex>
</student>
使用注解我们也可以看到也能达到相同的效果
注意:当使用XStream对象处理一个被注解的类型时,XStream对象也会处理所有与其相关的类型的注解信息,即该类型的父类、父接口、所有子类的注解。
十、XStream自定义转换器
1、XStream自带的转换器
XStream内部有许多转换器,用于JavaBean对象到XML或JSON之间的转换。这些转换器的详细信息网址:http://x-stream.github.io/converters.html
2、使用自定义转换器
package io.github.xstream.test04;
?
import com.thoughtworks.xstream.XStream;
import com.thoughtworks.xstream.annotations.XStreamAlias;
import lombok.AllArgsConstructor;
import lombok.Getter;
import lombok.Setter;
import lombok.ToString;
?
public class XStreamTest04 {
public static void main(String[] args) {
Student student =new Student("张三",19);
XStream xStream = new XStream();
//注册转换器
xStream.registerConverter(new StudentConverter());
//序列化
String xml = xStream.toXML(student);
System.out.println(xml);
//反序列化
student=(Student)xStream.fromXML(xml);
System.out.println(student);
}
}
?
@Getter
@Setter
@ToString
@AllArgsConstructor
class Student {
private String name;
private int age;
}
自定义转换器
package io.github.xstream.test04;
?
import com.thoughtworks.xstream.converters.Converter;
import com.thoughtworks.xstream.converters.MarshallingContext;
import com.thoughtworks.xstream.converters.UnmarshallingContext;
import com.thoughtworks.xstream.io.HierarchicalStreamReader;
import com.thoughtworks.xstream.io.HierarchicalStreamWriter;
?
public class StudentConverter implements Converter {
//定义转换器能转换的JavaBean类型
@Override
public boolean canConvert(Class type) {
return type.equals(Student.class);
}
?
//把对象序列化成XML或JSON
@Override
public void marshal(Object value, HierarchicalStreamWriter writer,
MarshallingContext context) {
Student student = (Student) value;
writer.startNode("姓名");
writer.setValue(student.getName());
writer.endNode();
writer.startNode("年龄");
writer.setValue(student.getAge() + "");
writer.endNode();
writer.startNode("转换器");
writer.setValue("自定义的转换器");
writer.endNode();
}
?
//把XML或JSON反序列化成对象
@Override
public Object unmarshal(HierarchicalStreamReader reader,
UnmarshallingContext context) {
Student student = new Student("", -1);
reader.moveDown();
student.setName(reader.getValue());
reader.moveUp();
reader.moveDown();
student.setAge(Integer.parseInt(reader.getValue()));
reader.moveUp();
return student;
}
}
3、执行结果
<student>
<姓名>张三</姓名>
<年龄>19</年龄>
<转换器>自定义的转换器</转换器>
</student>
Security framework of XStream not initialized, XStream is probably vulnerable.
Student(name=张三, age=19)
4、常用的转换器接口与抽象类
SingleValueConverter:单值转换接口
AbstractSingleValueConverter:单值转换抽象类
Converter:常规转换器接口
十一、XStream对象流
1、对象输出流
package io.github.xstream.test05;
?
import com.thoughtworks.xstream.XStream;
import com.thoughtworks.xstream.annotations.XStreamAlias;
import com.thoughtworks.xstream.annotations.XStreamAsAttribute;
import lombok.AllArgsConstructor;
import lombok.ToString;
?
import java.io.*;
?
public class XStreamTest05 {
public static void main(String[] args) throws IOException, ClassNotFoundException {
XStreamTest05 xStreamTest04 = new XStreamTest05();
String path = "F:\\test.txt";
XStream xStream = new XStream();//需要XPP3库
xStream.processAnnotations(Student.class);
xStream.autodetectAnnotations(true);
xStreamTest04.writeObject(xStream, path);
}
?
//对象输出流方法
public void writeObject(XStream xStream, String path) throws IOException {
Student zs = new Student("张三", 20);
Student ls = new Student("李四", 21);
Student ww = new Student("王五", 22);
ObjectOutputStream objectOutputStream = xStream.createObjectOutputStream(new FileOutputStream(path));
objectOutputStream.writeObject(zs);
objectOutputStream.writeObject(ls);
objectOutputStream.writeObject(ww);
objectOutputStream.writeObject("totalStudent");
objectOutputStream.writeInt(3);
objectOutputStream.close();
}
}
?
@AllArgsConstructor
@ToString
//别名注解
@XStreamAlias("student")
class Student {
@XStreamAlias("name")
//把字段节点设置成属性
@XStreamAsAttribute
private String studentName;
private int age;
}
2、在指定路径中打开test.txt文件,查看执行结果
<object-stream>
<student name="张三">
<age>20</age>
</student>
<student name="李四">
<age>21</age>
</student>
<student name="王五">
<age>22</age>
</student>
<string>totalStudent</string>
<int>3</int>
</object-stream>
注意:XStream对象流是通过标准java.io.ObjectOutputStream和java.io.ObjectInputStream对象。因为XML文档只能有一个根节点,必须包装在一个序列化的所有元素额外的根节点。这个根节点默认为<object-stream>上面的例子所示。
3、对象输入流
package io.github.xstream.test05;
?
import com.thoughtworks.xstream.XStream;
import com.thoughtworks.xstream.annotations.XStreamAlias;
import com.thoughtworks.xstream.annotations.XStreamAsAttribute;
import lombok.AllArgsConstructor;
import lombok.ToString;
?
import java.io.*;
?
public class XStreamTest05 {
public static void main(String[] args) throws IOException, ClassNotFoundException {
XStreamTest05 xStreamTest04 = new XStreamTest05();
String path = "F:\\test.txt";
XStream xStream = new XStream();//需要XPP3库
xStream.processAnnotations(Student.class);
xStream.autodetectAnnotations(true);
xStreamTest04.readObject(xStream, path);
}
?
//对象输入流方法
public void readObject(XStream xStream, String path) throws IOException, ClassNotFoundException {
ObjectInputStream objectInputStream = xStream.createObjectInputStream(new FileInputStream(path));
System.out.println((Student) objectInputStream.readObject());
System.out.println((Student) objectInputStream.readObject());
System.out.println((Student) objectInputStream.readObject());
System.out.println(objectInputStream.readObject());
System.out.println(objectInputStream.readInt());
}
}
?
@AllArgsConstructor
@ToString
//别名注解
@XStreamAlias("student")
class Student {
@XStreamAlias("name")
//把字段节点设置成属性
@XStreamAsAttribute
private String studentName;
private int age;
}
4、执行结果
Student(studentName=张三, age=20)
Student(studentName=李四, age=21)
Student(studentName=王五, age=22)
totalStudent
3
十二、XStream持久化API
1、保存Java对象
?package io.github.xstream.test06;
?
import com.thoughtworks.xstream.persistence.FilePersistenceStrategy;
import com.thoughtworks.xstream.persistence.PersistenceStrategy;
import com.thoughtworks.xstream.persistence.XmlArrayList;
import lombok.AllArgsConstructor;
import lombok.ToString;
?
import java.io.File;
import java.util.List;
?
public class XStreamTest06 {
public static void main(String[] args) {
XStreamTest06 xStreamTest06=new XStreamTest06();
xStreamTest06.saveObject();
}
?
//保存Java对象
public void saveObject(){
PersistenceStrategy strategy = new FilePersistenceStrategy(new File("F:\\"));
List list = new XmlArrayList(strategy);
list.add(new Student("张三",13));
list.add(new Student("李四",21));
list.add(new Student("王五",17));
}
}
?
@ToString
@AllArgsConstructor
class Student {
private String name;
private int age;
}
2、运行程序结果,在F磁盘的根路径可以看到有三个文件:int@0.xml、int@1.xml、int@2.xml,每个对象都被序列化到XML文件里
3、读取并删除JavaBean对象
package io.github.xstream.test06;
?
import com.thoughtworks.xstream.persistence.FilePersistenceStrategy;
import com.thoughtworks.xstream.persistence.PersistenceStrategy;
import com.thoughtworks.xstream.persistence.XmlArrayList;
import lombok.AllArgsConstructor;
import lombok.ToString;
?
import java.io.File;
import java.util.Iterator;
import java.util.List;
?
public class XStreamTest06 {
public static void main(String[] args) {
XStreamTest06 xStreamTest06 = new XStreamTest06();
xStreamTest06.deleteObject();
}
//读取并删除Java对象
public void deleteObject() {
PersistenceStrategy strategy = new FilePersistenceStrategy(new File("F:\\"));
List list = new XmlArrayList(strategy);
for (Iterator it = list.iterator(); it.hasNext(); ) {
System.out.println((Student) it.next());
//删除对象序列化文件
it.remove();
}
}
}
?
@ToString
@AllArgsConstructor
class Student {
private String name;
private int age;
}
4、运行程序结果,可以看到把F磁盘的根路径int@0.xml、int@1.xml、int@2.xml文件删除了
Security framework of XStream not initialized, XStream is probably vulnerable.
Student(name=张三, age=13)
Student(name=李四, age=21)
Student(name=王五, age=17)
十三、XStream操作JSON
1、XStream序列化JSON的重命名
package io.github.xstream.test07;
?
import com.thoughtworks.xstream.XStream;
import com.thoughtworks.xstream.annotations.XStreamAlias;
import com.thoughtworks.xstream.io.json.JettisonMappedXmlDriver;
import io.github.xstream.test04.StudentConverter;
import lombok.AllArgsConstructor;
import lombok.Getter;
import lombok.Setter;
import lombok.ToString;
?
public class XStreamTest07 {
public static void main(String[] args) {
XStreamTest07 xStreamTest07 = new XStreamTest07();
xStreamTest07.serializeJson();
}
?
public void serializeJson() {
Student student = new Student("张三", 19);
XStream xStream = new XStream(new JettisonMappedXmlDriver());//设置Json解析器
xStream.autodetectAnnotations(true);
//JSON序列化
String xml = xStream.toXML(student);
System.out.println(xml);
//JSON反序列化
student = (Student) xStream.fromXML(xml);
System.out.println(student);
}
}
?
@ToString
@AllArgsConstructor
@XStreamAlias("人")
class Student {
@XStreamAlias("姓名")
private String name;
@XStreamAlias("年龄")
private int age;
}
2、运行结果
{"人":{"姓名":"张三","年龄":19}}
Student(name=张三, age=19)
Security framework of XStream not initialized, XStream is probably vulnerable.
注意:XStream序列化JSON的重命名的方式与其序列化成XML的方式一样!
3、去掉序列化JSON的根节点
?package io.github.xstream.test07;
?
import com.thoughtworks.xstream.XStream;
import com.thoughtworks.xstream.annotations.XStreamAlias;
import com.thoughtworks.xstream.io.HierarchicalStreamWriter;
import com.thoughtworks.xstream.io.json.JettisonMappedXmlDriver;
import com.thoughtworks.xstream.io.json.JsonHierarchicalStreamDriver;
import com.thoughtworks.xstream.io.json.JsonWriter;
import io.github.xstream.test04.StudentConverter;
import lombok.AllArgsConstructor;
import lombok.Getter;
import lombok.Setter;
import lombok.ToString;
?
import java.io.Writer;
?
public class XStreamTest07 {
public static void main(String[] args) {
XStreamTest07 xStreamTest07 = new XStreamTest07();
xStreamTest07.removeRootNode();
}
?
public void removeRootNode() {
Student student = new Student("张三", 19);
XStream xStream = new XStream(new JsonHierarchicalStreamDriver() {
public HierarchicalStreamWriter createWriter(Writer writer) {
return new JsonWriter(writer, JsonWriter.DROP_ROOT_MODE);
}
});
//Json序列化
String xml = xStream.toXML(student);
System.out.println(xml);
}
}
?
@ToString
@AllArgsConstructor
@XStreamAlias("人")
class Student {
@XStreamAlias("姓名")
private String name;
@XStreamAlias("年龄")
private int age;
}
4、运行结果
{
"name": "张三",
"age": 19
}
注意:去掉根节点后的JSON串是不能反序列化的,因为XStream不知道它的类型。
5、JSON的解析器区别
前面两个例子使用了不同的JSON解析器,这里说明他们的不同之处:
-
JettisonMappedXmlDriver:是支持序列化和反序列化Json的。
-
JsonHierarchicalStreamDriver:只支持序列化,不支持反序列化。
参考:
http://x-stream.github.io
https://www.yiibai.com/xstream
https://www.cnblogs.com/LiZhiW/p/4313493.html
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原文链接:https://www.cnblogs.com/coding-farmer/p/13042646.html
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