XStream学习手册
- 工作小总结
- 时间：2021-12-22 11:51
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简介
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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>
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;
}<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>
@AllArgsConstructor
@ToString
class Student {
private String studentName;
private List<Phone> phones;
}
@AllArgsConstructor
@ToString
class Phone {
private String brand;
private String description;
}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;
}<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);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;
}<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");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;
}<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");
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;
}<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>
七、XStream属性混叠
xStream.useAttributeFor(Student.class, "studentName");
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;
}<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>
八、XStream包混叠
xStream.alias("student", Student.class);
xStream.alias("phone", Phone.class);xStream.aliasPackage("xx.xx.xx.xx", "io.github.xstream.test02");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;
}<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>
九、XStream注解
//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");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;
}xStream.autodetectAnnotations(true);
xStream.processAnnotations(new Class[]{Student.class});<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;
}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;
}
}<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)
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
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;
}<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;
}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
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;
}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;
}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
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;
}{"人":{"姓名":"张三","年龄":19}}
Student(name=张三, age=19)
Security framework of XStream not initialized, XStream is probably vulnerable.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;
}{
"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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版权声明：本文为CSDN博主「生出来，我养！」的原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接及本声明。
原文链接：https://blog.csdn.net/qq_39669058/article/details/106462745