对象流(Object Streams)
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2023-12-01
XStream提供了java.io.ObjectInputStream和java.io.ObjectOutputStream的替代实现,以便可以从XML序列化或反序列化对象流。 当要处理大型对象集时,这一点特别有用,一次将一个对象保留在内存中。
Syntax: createObjectOutputStream()
ObjectOutputStream objectOutputStream = xstream.createObjectOutputStream(
new FileOutputStream("test.txt"));
Syntax: createObjectInputStream()
ObjectInputStream objectInputStream = xstream.createObjectInputStream(
new FileInputStream("test.txt"));
现在让我们在XStream中使用对象流测试代码。
在C:\> XStream_WORKSPACE\com\xnip\xstream中创建名为XStreamTester的java类文件。
File: XStreamTester.java
package cn.xnip.xstream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import com.thoughtworks.xstream.XStream;
import com.thoughtworks.xstream.annotations.XStreamAlias;
import com.thoughtworks.xstream.io.xml.StaxDriver;
public class XStreamTester {
public static void main(String args[]) {
XStreamTester tester = new XStreamTester();
XStream xstream = new XStream(new StaxDriver());
xstream.autodetectAnnotations(true);
Student student1 = new Student("Mahesh","Parashar");
Student student2 = new Student("Suresh","Kalra");
Student student3 = new Student("Ramesh","Kumar");
Student student4 = new Student("Naresh","Sharma");
try {
ObjectOutputStream objectOutputStream = xstream.createObjectOutputStream(
new FileOutputStream("test.txt"));
objectOutputStream.writeObject(student1);
objectOutputStream.writeObject(student2);
objectOutputStream.writeObject(student3);
objectOutputStream.writeObject(student4);
objectOutputStream.writeObject("Hello World");
objectOutputStream.close();
ObjectInputStream objectInputStream = xstream.createObjectInputStream(
new FileInputStream("test.txt"));
Student student5 = (Student)objectInputStream.readObject();
Student student6 = (Student)objectInputStream.readObject();
Student student7 = (Student)objectInputStream.readObject();
Student student8 = (Student)objectInputStream.readObject();
String text = (String)objectInputStream.readObject();
System.out.println(student5);
System.out.println(student6);
System.out.println(student7);
System.out.println(student8);
System.out.println(text);
} catch (IOException e) {
e.printStackTrace();
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
}
}
@XStreamAlias("student")
class Student {
private String firstName;
private String lastName;
public Student(String firstName, String lastName) {
this.firstName = firstName;
this.lastName = lastName;
}
public String getFirstName() {
return firstName;
}
public String getLastName() {
return lastName;
}
public String toString() {
return "Student [ firstName: "+firstName+", lastName: "+ lastName+ " ]";
}
}
验证结果 (Verify the Result)
使用javac编译器编译类如下 -
C:\XStream_WORKSPACE\com\xnip\xstream>javac XStreamTester.java
现在运行XStreamTester来查看结果 -
C:\XStream_WORKSPACE\com\xnip\xstream>java XStreamTester
验证输出如下 -
Student [ firstName: Mahesh, lastName: Parashar ]
Student [ firstName: Suresh, lastName: Kalra ]
Student [ firstName: Ramesh, lastName: Kumar ]
Student [ firstName: Naresh, lastName: Sharma ]
Hello World
查看C:\》XStream_WORKSPACE\com\xnip\xstream文件夹中的test.txt的内容。
<?xml version = "1.0" ?>
<object-stream>
<student>
<firstName>Mahesh</firstName>
<lastName>Parashar</lastName>
</student>
<student>
<firstName>Suresh</firstName>
<lastName>Kalra</lastName>
</student>
<student>
<firstName>Ramesh</firstName>
<lastName>Kumar</lastName>
</student>
<student>
<firstName>Naresh</firstName>
<lastName>Sharma</lastName>
</student>
<string>Hello World</string>
</object-stream>