使用XStream是實現XML與Java對象的轉換(5)--Object Stream

八，Object Stream

 之前的例子我們都是直接輸出Xml成爲String類型或者從String中獲得並解析Xml，現在我們要處理輸入流和輸出流！

1,輸出流(ObjectOutputStream)

輸出流測試程序如下：

package cn.tjpu.zhw.xml.xstream5;
 
import java.io.IOException;
import java.io.ObjectOutputStream;
 
import com.thoughtworks.xstream.XStream;
 
public class OutMain {
 
   public static void main(String[] args) throws IOException {
      //創建XStream對象
      XStream xstream = new XStream();
     
      /*******1，序列化單個對象*******/
      System.out.println("*******1，序列化單個對象*******");
      xstream.toXML(new Person("張三"), System.out);
     
      System.out.println();
      System.out.println();
     
      /*******2，序列化一組對象*******/
      System.out.println("*******2，序列化一組對象*******");
      //將格式化後的xml輸出到System.out中，root是根節點
      ObjectOutputStream oos = xstream.createObjectOutputStream(System.out,"root");
      oos.writeObject(new Person("張三"));
      oos.writeObject(new Person("李四"));
      oos.writeObject(new Integer(1));
      oos.writeObject(2);
      oos.writeObject(new Double(3));
      oos.writeObject(4d);
      oos.writeObject('c');
      oos.writeObject("這是一堆字符串！");
      //一定要關閉流
      oos.close();
   }
}
 
class Person {
   public Person(String name){
      this.name = name;
   }
   private String name;
 
   public String getName() {
      return name;
   }
 
   public void setName(String name) {
      this.name = name;
   }
 
   public String toString() {
      return "Person對象的name="+getName();
   }
}

 

 

運行結果：

*******1，序列化單個對象*******
<cn.tjpu.zhw.xml.xstream5.Person>
  <name>張三</name>
</cn.tjpu.zhw.xml.xstream5.Person>
 
*******2，序列化一組對象*******
<root>
  <cn.tjpu.zhw.xml.xstream5.Person>
    <name>張三</name>
  </cn.tjpu.zhw.xml.xstream5.Person>
  <cn.tjpu.zhw.xml.xstream5.Person>
    <name>李四</name>
  </cn.tjpu.zhw.xml.xstream5.Person>
  <int>1</int>
  <int>2</int>
  <double>3.0</double>
  <double>4.0</double>
  <char>c</char>
  <string>這是一堆字符串！</string>
</root>

 

 上面兩個例子都是直接使用System.out，將XML輸出到控制檯。其實我們可以將其替換成我們喜歡的任何輸出流，比如FileWriter等。

2,輸入流(ObjectInputStream)

將如下內容寫入D:/temp1.xml文件：

<cn.tjpu.zhw.xml.xstream5.Person>
  <name>張三</name>
</cn.tjpu.zhw.xml.xstream5.Person>

 

 

將如下內容寫入D:/temp2.xml文件：

<root>
  <cn.tjpu.zhw.xml.xstream5.Person>
    <name>張三</name>
  </cn.tjpu.zhw.xml.xstream5.Person>
  <cn.tjpu.zhw.xml.xstream5.Person>
    <name>李四</name>
  </cn.tjpu.zhw.xml.xstream5.Person>
  <int>1</int>
  <int>2</int>
  <double>3.0</double>
  <double>4.0</double>
  <char>c</char>
  <string>這是一堆字符串！</string>
</root>

 

 

輸入流測試程序如下：

package cn.tjpu.zhw.xml.xstream5;
 
import java.io.EOFException;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.io.ObjectInputStream;
 
import com.thoughtworks.xstream.XStream;
 
public class InMain {
 
   public static void main(String[] args) throws IOException, ClassNotFoundException {
     
      //創建XStream對象
      XStream xstream = new XStream();
     
      /*******1，反序列化一個對象*******/
      FileReader reader1 = new FileReader(new File("D:/temp1.xml"));
      Person pp = (Person)xstream.fromXML(reader1);
      System.out.println("*******1，反序列化一個對象*******");
      System.out.println("pp="+pp);
     
     
      System.out.println();
      System.out.println();
     
      /*******1，反序列化一組對象*******/
      FileReader reader2 = new FileReader(new File("D:/temp2.xml"));
      ObjectInputStream ois = xstream.createObjectInputStream(reader2);
     
      Person p1 = (Person)ois.readObject();
      System.out.println("p1="+p1);
     
      Person p2 = (Person)ois.readObject();
      System.out.println("p2="+p2);
     
      int i1 = (Integer)ois.readObject();
      System.out.println("i1="+i1);
     
      int i2 = (Integer)ois.readObject();
      System.out.println("i2="+i2);
     
      double d1 = (Double)ois.readObject();
      System.out.println("d1="+d1);
     
      double d2 = (Double)ois.readObject();
      System.out.println("d2="+d2);
     
      char ch = (Character)ois.readObject();
      System.out.println("ch="+ch);
     
      String str = (String)ois.readObject();
      System.out.println("str="+str);
     
      System.out.println("******異常捕獲******");
      //發生異常
      try {
        ois.readObject();
      } catch (EOFException e) {
        System.out.println("因爲已經沒有數據了，再次讀取時，就會發生EOFException異常");
      }
   }
 
}

 

運行結果：

 

*******1，反序列化一個對象*******
pp=Person對象的name=張三
 
 
p1=Person對象的name=張三
p2=Person對象的name=李四
i1=1
i2=2
d1=3.0
d2=4.0
ch=c
str=這是一堆字符串！
******異常捕獲******
因爲已經沒有數據了，再次讀取時，就會發生EOFException異常