前言
例如：在使用Java对接WebService接口的过程中，我最常见的就是XML格式的出入参了，以往个人认为使用JSON来说是最方便的，但是奈何对方的接口文档都是XML格式。所以这篇文章记录下，本人使用的map转XML格式的工具类
一、Map转XML工具类
public static String mapToXml(Map<String, Object> data) {
String output = null;
try {
DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder documentBuilder = documentBuilderFactory.newDocumentBuilder();
org.w3c.dom.Document document = documentBuilder.newDocument();
org.w3c.dom.Element root = document.createElement("xml");
document.appendChild(root);
for (String key : data.keySet()) {
String value = String.valueOf(data.get(key));
if (value == null) {
value = "";
}
value = value.trim();
org.w3c.dom.Element filed = document.createElement(key);
filed.appendChild(document.createTextNode(value));
root.appendChild(filed);
}
TransformerFactory tf = TransformerFactory.newInstance();
Transformer transformer = tf.newTransformer();
DOMSource source = new DOMSource(document);
transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
transformer.setOutputProperty(OutputKeys.INDENT, "yes");
StringWriter writer = new StringWriter();
StreamResult result = new StreamResult(writer);
transformer.transform(source, result);
output = writer.getBuffer().toString(); //.replaceAll("\n|\r", "");
writer.close();
} catch (Exception ex) {
ex.printStackTrace();
log.error("XML转换异常 == {}",ex.getMessage());
}
return output;
}
二、XML转Map工具类
/**
* XML格式字符串转换为Map
*
* @param strXML XML字符串
* @return XML数据转换后的Map
* @throws Exception
*/
public static Map<String, String> xmlToMap(String strXML) throws Exception {
Map<String, String> data = new HashMap<String, String>();
DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder documentBuilder = documentBuilderFactory.newDocumentBuilder();
InputStream stream = new ByteArrayInputStream(strXML.getBytes("UTF-8"));
org.w3c.dom.Document doc = documentBuilder.parse(stream);
doc.getDocumentElement().normalize();
NodeList nodeList = doc.getDocumentElement().getChildNodes();
for (int idx = 0; idx < nodeList.getLength(); ++idx) {
Node node = nodeList.item(idx);
if (node.getNodeType() == Node.ELEMENT_NODE) {
org.w3c.dom.Element element = (org.w3c.dom.Element) node;
data.put(element.getNodeName(), element.getTextContent());
}
}
try {
stream.close();
} catch (Exception ex) {
}
return data;
}
三、使用到的包
import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;
import lombok.extern.slf4j.Slf4j;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import java.util.List;
import org.dom4j.Document;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.io.StringWriter;
import java.util.HashMap;
import java.util.Map;
四、XML转JSON
代码如下（示例）：
public static JSONObject xmltoJson(String xml) throws Exception {
// SAXReader reader = new SAXReader();
// Document document = reader.read(new File("XXXXXX.xml"));
JSONObject jsonObject = new JSONObject();
Document document = DocumentHelper.parseText(xml);
// 获取根节点元素对象
Element root = document.getRootElement();
iterateNodes(root, jsonObject);
return jsonObject;
}
public static void iterateNodes(Element node, JSONObject json) {
// 获取当前元素的名称
String nodeName = node.getName();
// 判断已遍历的JSON中是否已经有了该元素的名称
if (json.containsKey(nodeName)) {
// 该元素在同级下有多个
Object Object = json.get(nodeName);
JSONArray array = null;
if (Object instanceof JSONArray) {
array = (JSONArray) Object;
}
else {
array = new JSONArray();
array.add(Object);
}
// 获取该元素下所有子元素
List<Element> listElement = node.elements();
if (listElement.isEmpty()) {
// 该元素无子元素，获取元素的值
String nodeValue = node.getTextTrim();
array.add(nodeValue);
json.put(nodeName, array);
return;
}
// 有子元素
JSONObject newJson = new JSONObject();
// 遍历所有子元素
for (Element e : listElement) {
// 递归
iterateNodes(e, newJson);
}
array.add(newJson);
json.put(nodeName, array);
return;
}
// 该元素同级下第一次遍历
// 获取该元素下所有子元素
List<Element> listElement = node.elements();
if (listElement.isEmpty()) {
// 该元素无子元素，获取元素的值
String nodeValue = node.getTextTrim();
json.put(nodeName, nodeValue);
return;
}
// 有子节点，新建一个JSONObject来存储该节点下子节点的值
JSONObject object = new JSONObject();
// 遍历所有一级子节点
for (Element e : listElement) {
// 递归
iterateNodes(e, object);
}
json.put(nodeName, object);
return;
}
五、pom文件，大致用到的包
<!--Lombok-->
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
</dependency>
<dependency>
<groupId>org.lucee</groupId>
<artifactId>axis-ant</artifactId>
<version>1.4.0.L0001</version>
</dependency>
<dependency>
<groupId>axis</groupId>
<artifactId>axis</artifactId>
<version>1.4</version>
</dependency>
<dependency>
<groupId>commons-logging</groupId>
<artifactId>commons-logging-api</artifactId>
<version>1.1</version>
</dependency>
<dependency>
<groupId>javax.xml</groupId>
<artifactId>jaxrpc</artifactId>
<version>1.1</version>
</dependency>
<dependency>
<groupId>wsdl4j</groupId>
<artifactId>wsdl4j</artifactId>
<version>1.6.3</version>
</dependency>
总结
代码已经贴的很全了，建个工具类，需要用到的copy进去就可以了；