[英]Using JAXB to create XML from MAP
我想從Java.util.Map創建XML我在該映射中放置值並嘗試創建XML,其中根元素將是可配置的,並且將從該映射創建子元素。
Map mp = new HashMap();
mp.put("key","shaon"):
mp.put("newKey","newValue");
而XML將如下:
<shaonsXML>
<key>shaon</key>
<newKey> newValue </newKey>
</shaonsXML>
我見過使用JAXB的示例,但是這些示例並沒有像我想要生成的那樣創建XML標記。
任何人都可以給我一些鏈接或建議嗎? 提前致謝!
但它生成這個XML:
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<root>
<mapProperty>
<item>
<key>KEY1</key>
<value>SHAON</value>
</item>
<item>
<key>newKEY</key>
<value>newValue</value>
</item>
</mapProperty>
</root>
我做的! 使用了這個例子
從上面的帖子:創建這個類:
public class MapAdapter extends XmlAdapter<MapWrapper, Map<String, String>>{
@Override
public Map<String, String> unmarshal(MapWrapper v) throws Exception {
Map<String, String> map = new HashMap<String,String>();//v.toMap();
return map;
}
@Override
public MapWrapper marshal(Map<String, String> m) throws Exception {
MapWrapper wrapper = new MapWrapper();
for(Map.Entry<String, String> entry : m.entrySet()){
wrapper.addEntry(new JAXBElement<String>(new QName(entry.getKey()), String.class, entry.getValue()));
}
return wrapper;
}
}
MapWrapper類:
@XmlType
public class MapWrapper{
private List<JAXBElement<String>> properties = new ArrayList<>();
public MapWrapper(){
}
@XmlAnyElement
public List<JAXBElement<String>> getProperties() {
return properties;
}
public void setProperties(List<JAXBElement<String>> properties) {
this.properties = properties;
}
public void addEntry(JAXBElement<String> prop){
properties.add(prop);
}
public void addEntry(String key, String value){
JAXBElement<String> prop = new JAXBElement<String>(new QName(key), String.class, value);
addEntry(prop);
}
}
創建此CustomMap
@XmlRootElement(name="RootTag")
public class CustomMap extends MapWrapper{
public CustomMap(){
}
}
通過創建XML測試代碼:
private static void writeAsXml(Object o, Writer writer) throws Exception
{
JAXBContext jaxb = JAXBContext.newInstance(o.getClass());
Marshaller xmlConverter = jaxb.createMarshaller();
xmlConverter.setProperty("jaxb.formatted.output", true);
xmlConverter.marshal(o, writer);
}
CustomMap map = new CustomMap();
map.addEntry("Key1","Value1");
map.addEntry("Key2","Value2");
map.addEntry("Key3","Value3");
map.addEntry("Key4","Value4");
writeAsXml(map, new PrintWriter(System.out));
並制作了XML:
<RootTag>
<Key1>Value1</Key1>
<Key2>Value2</Key2>
<Key3>Value3</Key3>
<Key4>Value4</Key4>
</RootTag>
我只需要Marshaling所以沒有實現Unmarshal部分。
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