Deserializing xml with duplicate entries using xstream

问题

I am trying to read in an xml file and store its contents as an object for later use. I can reproduce a similar object using the toXML() method and providing sample data however when I call fromXML() on the same object I get an error. The problem is I have multiple instances of fiels. The xml looks something like this...

<House>   
  <Address>
    <Number>1234</Number>
    <Street>Sample St.</Street>
    <City>Sample City</City>
  </Address>
  <Resident>
    <Name>Joe</Name>
    <Age>38</Age>
    <Profession>
      <Title>Engineer</Title>
      <Title>Developer</Title>
    </Profession>
  </Resident>
  <Resident>
    <Name>Cathy</Name>
    <Age>35</Age>
    <Profession>
      <Title>Engineer</Title>
      <Title>Developer</Title>
    </Profession>
  </Resident>
</House>

So in this example there are two residents and they each have two job titles. I tried defining these tags as arraylists in the constructors' for their respective classes but that didn't seem to work. This works fine if I only have one instance of Resident or Title etc.

Here is the Java code (copied from comment below):

XStream xstream = new XStream(new DomDriver()); 
FileReader fin = new FileReader("path_to_file.xml"); 
BufferedReader br = new BufferedReader(fin); 

while(br.ready())
{ 
  str += br.readLine() + "\n"; 
} 

House house = (House)xstream.fromXML(str);


import java.util.ArrayList;


public class House {

private Address Address;
private ArrayList<Resident> Resident;

public House(Address address, ArrayList<Resident> resident) {

    Address = address;
    Resident = resident;
}

public Address getAddress() {
    return Address;
}

public void setAddress(Address address) {
    Address = address;
}

public ArrayList<Resident> getResident() {
    return Resident;
}

public void setResident(ArrayList<Resident> resident) {
    Resident = resident;
}

}

回答1:

Here is how to do it using annotations.

@XStreamAlias("house")
public class House{

@XStreamAlias("Address")
private String address;

@XStreamImplicit
protected List<Resident> residents;

    ...

}

And at the Resident class you do:

@XStreamAlias("resident")
public class Resident{

@XStreamAlias("name")
private String name;

@XStreamAlias("age")
private int age;

@XStreamAlias("profession")
private String profession;


@XStreamImplicit
protected List<String> titles

    ...

}

Remember to process the annotations.

来源：https://stackoverflow.com/questions/7491195/deserializing-xml-with-duplicate-entries-using-xstream

标签

java

xstream