Java 如何使用XStream将对象列表转换为XML文档
如何使用XStream将对象列表转换为XML文档 如何反序列化它 这是我的xmlJava 如何使用XStream将对象列表转换为XML文档,java,xml,xstream,Java,Xml,Xstream,如何使用XStream将对象列表转换为XML文档 如何反序列化它 这是我的xml <?xml version="1.0" encoding="UTF-8"?> <persons> <person> <fullname>Guilherme</fullname> <age>10</age> <address>address,address,address,address,</addr
<?xml version="1.0" encoding="UTF-8"?>
<persons>
<person>
<fullname>Guilherme</fullname>
<age>10</age>
<address>address,address,address,address,</address>
</person>
<person>
<fullname>Guilherme</fullname>
<age>10</age>
<address>address,address,address,address,</address>
</person>
</persons>
吉列尔梅
10
地址,地址,地址,地址,
吉列尔梅
10
地址,地址,地址,地址,
Person bean包含3个字段,如何使用自定义转换器将其转换回bean列表?只需使用std-toXml和fromXml方法,请参阅示例。另请参见有关默认转换如何工作的信息 好的,所以默认的转换器在您的情况下不太起作用。您需要遵循:
您不一定需要自定义转换器 您需要一个类来保存您的列表:
public class PersonList {
private List<Person> list;
public PersonList(){
list = new ArrayList<Person>();
}
public void add(Person p){
list.add(p);
}
}
将xml反序列化到person对象列表:
XStream xstream = new XStream();
xstream.alias("person", Person.class);
xstream.alias("persons", PersonList.class);
xstream.addImplicitCollection(PersonList.class, "list");
PersonList list = new PersonList();
list.add(new Person("ABC",12,"address"));
list.add(new Person("XYZ",20,"address2"));
String xml = xstream.toXML(list);
String xml = "<persons><person>...</person></persons>";
PersonList pList = (PersonList)xstream.fromXML(xml);
stringxml=“…”;
PersonList pList=(PersonList)xstream.fromXML(xml);
加载XML
public static Object Load(String xmlPath) throws Exception
{
File FileIn = new File(xmlPath);
if(FileIn.exists()) {
//Initialise Doc
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
Document Doc = builder.parse(FileIn);
//Initialise XPath
XPathFactory xPathFactory = XPathFactory.newInstance();
XPath xpath = xPathFactory.newXPath();
String objectClassLocation = xpath.evaluate("/object/@class",Doc);
Object ObjType;
//Create List of attributes for the Student
XPathExpression xpathExpression = xpath.compile("/object/*");
NodeList ObjTypeAttributes = (NodeList)xpathExpression.evaluate(Doc, XPathConstants.NODESET);
ObjType = CreateObject(ObjTypeAttributes, objectClassLocation);
return ObjType;
}
return null;
}
创建对象
public static Object CreateObject(NodeList ObjectAttributes, String Location) throws Exception
{
Class ClassName = Class.forName(Location);
Object object = ClassName.newInstance();
Field[] fields = ClassName.getFields();
for(int x = 0; x < fields.length;x++)
{
for(int y = 0; y<ObjectAttributes.getLength(); y++)
{
if(!(ObjectAttributes.item(y) instanceof Text)) {
String check = ObjectAttributes.item(y).getAttributes().item(0).getNodeValue();
if(fields[x].getName().equals(check))
{
Field curField = ClassName.getField(fields[x].getName());
if(ObjectAttributes.item(y).getAttributes().getLength() < 2) {
curField.set(object,CreateList(ObjectAttributes.item(y).getChildNodes()));
}
else {
curField.set(object,ObjectAttributes.item(y).getAttributes().item(1).getNodeValue());
}
}
}
}
}
return object;
}
public静态对象CreateObject(节点列表ObjectAttributes,字符串位置)引发异常
{
Class ClassName=Class.forName(位置);
Object=ClassName.newInstance();
Field[]fields=ClassName.getFields();
for(int x=0;x 对于(int y=0;yThanks,我已经更新了问题谢谢,但在这里我只是反序列化,我需要编写自己的转换器,我对列表转换感到困惑在您的示例中,我得到了一个错误:“@Marci man”隐式收集的“无字段”列表请注意xstream.addImplicitCollection中的List
(PersonList.class,“list”);
必须是PersonList
的集合名,即list
。Dobane,xstream.alias
调用的目的是什么?是否可以用作通用对象序列化程序(类似于接受对象并将其保存为XML等的服务)?
public static ArrayList CreateList(NodeList ArrayNodeList) throws Exception
{
ArrayList List = new ArrayList();
for(int x = 0; x < ArrayNodeList.getLength();x++)
{
if(!(ArrayNodeList.item(x) instanceof Text)) {
Node curNode = ArrayNodeList.item(x);
NodeList att = curNode.getChildNodes();
String Location = ArrayNodeList.item(x).getAttributes().item(0).getNodeValue();
Object newOne = CreateObject(att, Location);
List.add(newOne);
}
}
return List;
}
<?xml version="1.0" encoding="UTF-8"?>
<object class="Example.Rps">
<field name="Representatives">
<object class="Example.Rep">
<field name="RepID" value="888225462"/>
<field name="Surname" value="Johnson"/>
<field name="Name" value="Dave"/>
<field name="Clients">
<object class="Example.Client">
<field name="ClientName" value="Cipla"/>
<field name="State" value="New York"/>
<field name="grade" value="A"/>
</object>
<object class="Example.Client">
<field name="ClientName" value="Pharmco"/>
<field name="State" value="Iowa"/>
<field name="grade" value="B"/>
</object>
</field>
</object>
<object class="Example.Rep">
<field name="RepID" value="888225462"/>
<field name="Surname" value="Dickson"/>
<field name="Name" value="Ben"/>
<field name="Clients">
<object class="Example.Client">
<field name="ClientName" value="XYZ"/>
<field name="State" value="New Mexico"/>
<field name="grade" value="A"/>
</object>
<object class="Example.Client">
<field name="ClientName" value="Pharmco"/>
<field name="State" value="Ohio"/>
<field name="grade" value="c"/>
</object>
</field>
</object>
</field>
</object>