Jackson轉換XML

##Jackson轉換XML##

###依賴的jar包###

jackson-annotations-2.6.0.jar

jackson-core-2.6.3.jar

jackson-databind-2.6.3.jar

jackson-dataformat-xml-2.6.4.jar

jackson-module-jaxb-annotations-2.6.4.jar

stax2-api-3.1.4.jar

###XmlMapper和ToXmlGenerator###

XmlMapper

XmlMapper xmlMapper = new XmlMapper();

ToXmlGenerator

輸出前須要flush()，使用後須要close

ToXmlGenerator xmlGenerator = xmlMapper.getFactory().createGenerator(System.out, JsonEncoding.UTF8);

if (xmlGenerator != null) {
        xmlGenerator.flush();
}
if (!xmlGenerator.isClosed()) {
    xmlGenerator.close();
}

POJO

AccountBean bean = new AccountBean();
bean.setAddress("china-Guangzhou");
bean.setEmail("hoojo_@126.com");
bean.setId(1);
bean.setName("hoojo");

---

###POJO轉換成xml###

XmlMapper

String xml = xmlMapper.writeValueAsString(bean);
 //或
 xmlMapper.writeValue(System.out, bean);

ToXmlGenerator

xmlGenerator.writeObject(bean);

輸出：<AccountBean xmlns=""><id>1</id><name>hoojo</name><email>hoojo_@126.com</email><address>china-Guangzhou</address><birthday/></AccountBean>

###xml轉換成POJO###

String xml = "<AccountBean xmlns=\"\"><id>1</id><name>hoojo</name><email>hoojo_@126.com</email><address>china-Guangzhou</address><birthday/></AccountBean>";

 AccountBean accountBean = xmlMapper.readValue(xml, AccountBean.class);

---

###List轉換成xml###

XmlMapper

String xmlList = xmlMapper.writeValueAsString(list);
//或
xmlMapper.writeValue(System.out, list);

ToXmlGenerator

xmlGenerator.writeObject(list);

<ArrayList xmlns=""><item><id>1</id><name>hoojo</name><email>hoojo_@126.com</email><address>china-Guangzhou</address><birthday/></item><item><id>1</id><name>hoojo</name><email>hoojo_@126.com</email><address>china-Guangzhou</address><birthday/></item></ArrayList>

###xml轉換成數組###

String xmlList = "<ArrayList xmlns=""><item><id>1</id><name>hoojo</name><email>hoojo_@126.com</email><address>china-Guangzhou</address><birthday/></item><item><id>1</id><name>hoojo</name><email>hoojo_@126.com</email><address>china-Guangzhou</address><birthday/></item></ArrayList>";

AccountBean[] beans = xmlMapper.readValue(xmlList,AccountBean[].class);

###xml轉換成List###

String xmlList = "<ArrayList xmlns=\"\"><item><id>1</id><name>hoojo</name><email>hoojo_@126.com</email><address>china-Guangzhou</address><birthday/></item><item><id>1</id><name>hoojo</name><email>hoojo_@126.com</email><address>china-Guangzhou</address><birthday/></item></ArrayList>";

JavaType listType = xmlMapper.getTypeFactory().constructParametrizedType(ArrayList.class, List.class, AccountBean.class);

ArrayList<AccountBean> list1 = xmlMapper.readValue(xmlList, listType);
for(int i=0; i<list1.size(); i++){
    System.out.println(list1.get(i));
}

###xml轉換成List<Map>###

（全部的xml對象都會直接解析成LinkedHashMap）

String xmlList = "<ArrayList xmlns=\"\"><item><id>1</id><name>hoojo</name><email>hoojo_@126.com</email><address>china-Guangzhou</address><birthday/></item><item><id>1</id><name>hoojo</name><email>hoojo_@126.com</email><address>china-Guangzhou</address><birthday/></item></ArrayList>";

  List<LinkedHashMap<String,Object>> list2 = xmlMapper.readValue(xmlList, List.class);

  for(int i=0; i<list2.size(); i++){
    LinkedHashMap<String,Object> map = list2.get(i);
    Iterator<Map.Entry<String,Object>> entryIter = map.entrySet().iterator();
    while(entryIter.hasNext()){
        Map.Entry<String,Object> entry = entryIter.next();
        System.out.println(entry.getKey() + "=" + entry.getValue());
    }
        System.out.println(list2.get(i));
    }

---

###Map轉換成xml###

XmlMapper

String mapStrrin = xmlMapper.writeValueAsString(map);
//或
xmlMapper.writeValue(System.out, map);

ToXmlGenerator

xmlGenerator.writeObject(map);

<HashMap xmlns=""><A><id>1</id><name>hoojo</name><email>hoojo_@126.com</email><address>china-Guangzhou</address><birthday/></A><B><id>1</id><name>hoojo</name><email>hoojo_@126.com</email><address>china-Guangzhou</address><birthday/></B></HashMap>

###xml轉換成Map###

String xmlMap = "<HashMap xmlns=\"\"><A><id>1</id><name>hoojo</name><email>hoojo_@126.com</email><address>china-Guangzhou</address><birthday/></A><B><id>1</id><name>hoojo</name><email>hoojo_@126.com</email><address>china-Guangzhou</address><birthday/></B></HashMap>";

第一種：解析成String-POJO

JavaType javaType = xmlMapper.getTypeFactory().constructMapType(Map.class, String.class, AccountBean.class);
Map<String, AccountBean> maps = xmlMapper.readValue(xmlMap, javaType);

Iterator<Map.Entry<String,AccountBean>> entryIter = maps.entrySet().iterator();
while(entryIter.hasNext()){
    Map.Entry<String,AccountBean> entry = entryIter.next();
    System.out.println(entry.getKey() + "==" + entry.getValue());
}

第二種：解析成String-LinkedHashMap<String,String>

Map<String, LinkedHashMap<String,String>> map = xmlMapper.readValue(xmlMap, Map.class);

System.out.println(map);

Iterator<Map.Entry<String,LinkedHashMap<String,String>>> entryIterator = map.entrySet().iterator();
while(entryIter.hasNext()){
    Map.Entry<String,LinkedHashMap<String,String>> entrys = entryIterator.next();
    System.out.println(entrys.getKey() + "=");

    LinkedHashMap<String,String> entryMap = entrys.getValue();
    Iterator<Map.Entry<String,String>> iter = entryMap.entrySet().iterator();
    while(iter.hasNext()){
        Map.Entry<String,String> entry = iter.next();
        System.out.println(entry.getKey() + "=" + entry.getValue());
    }
}

---

###複雜的xml輸出###

XmlMapper xmlMapper = new XmlMapper();
    ToXmlGenerator xmlGenerator = xmlMapper.getFactory().createGenerator(System.out, JsonEncoding.UTF8);

    QName root = new QName("catalog");
    xmlGenerator.setNextName(root);//<catalog>

    xmlGenerator.writeStartObject();

    QName book = new QName("book");

    xmlGenerator.startWrappedValue(book, root);//<book>

    xmlGenerator.setNextIsAttribute(true);
    xmlGenerator.writeFieldName("id");
    xmlGenerator.writeString("bk101");

    xmlGenerator.setNextIsAttribute(false);
    xmlGenerator.writeFieldName("title");
    xmlGenerator.writeString("the title");

    xmlGenerator.setNextIsAttribute(false);
    xmlGenerator.writeFieldName("price");
    xmlGenerator.writeNumber(44.95);;

    xmlGenerator.finishWrappedValue(book, root);//</book>

    xmlGenerator.startWrappedValue(book, root);//<book>

    xmlGenerator.setNextIsAttribute(true);
    xmlGenerator.writeFieldName("id");
    xmlGenerator.writeString("bk102");

    xmlGenerator.setNextIsAttribute(false);
    xmlGenerator.writeFieldName("title2");
    xmlGenerator.writeString("the title2");

    xmlGenerator.setNextIsAttribute(false);
    xmlGenerator.writeFieldName("price2");
    xmlGenerator.writeNumber(22.95);;

    xmlGenerator.finishWrappedValue(book, root);//</book>

    xmlGenerator.writeEndObject();//</catalog>
    xmlGenerator.flush();
    xmlGenerator.close();

    輸出：（id前的zdef-863096486:暫時不知道怎麼解決）
    <catalog xmlns="">
        <book zdef-863096486:id="bk101">
            <title>the title</title>
            <price>44.95</price>
        </book>
        <book zdef737113102:id="bk102">
            <title2>the title2</title2>
            <price2>22.95</price2>
        </book>
    </catalog>

###其餘###

參考：http://blog.csdn.net/laixiaonian/article/details/8144920