使用Java从复杂的XML读取值

Question

I am trying to read a XML file using JAVA . XML file:-<

<?xml version="1.0" encoding="UTF-8"?>


<document>
 <testCaseDataName>
  <id>1</id >
  <testCaseName>EditTest</testCaseName >
  <expectedResult>true</expectedResult >

 </testCaseDataName>
 <testCaseDataName>
  <id>2</id >
  <testCaseName>AddTest</testCaseName >
  <expectedResult>true</expectedResult>
  <parameter>
    <key>featues</key >
    <value>new</value>
    </parameter>
 </testCaseDataName>

  <testCaseDataName>
  <id>3</id >
  <testCaseName>AddTest</testCaseName >
  <expectedResult>true</expectedResult>
  <parameter>
    <key>projectType</key >
    <value>old</value>
    </parameter>
    <parameter>
    <key>Name</key >
    <value>Marvel</value>
    </parameter>
    <parameter>
    <key>status</key >
    <value>ACTIVE</value>
    </parameter>
    <parameter>
    <key>canOrder</key >
    <value>Yes</value>
    </parameter>
 </testCaseDataName>
 <testCaseDataName>
  <id>4</id >
  <testCaseName>AddTest</testCaseName >
  <expectedResult>empty</expectedResult>
  <parameter>
    <key>projectType</key >
    <value>GEN</value>
    </parameter>
    <parameter>
    <key>Name</key >
    <value>HPM</value>
    </parameter>
    <key>no status</key >
    <value>ACTIVE</value>
    <parameter>
    <key>canOrder</key >
    <value>Yes</value>
    </parameter>
 </testCaseDataName>

 </document>

I am trying to read the key and value from parameters to a hashmap .here is my code:-

public class JDOM {

    public static void main(String[] args) throws JDOMException, IOException {
        // TODO Auto-generated method stub
        File xsdfile = new File("file.xsd");
        XMLReaderJDOMFactory schemafac = new XMLReaderXSDFactory(xsdfile);
        SAXBuilder builder = new SAXBuilder(schemafac);
        //Document doc = new SAXBuilder().build(new File("testdbcsv/ACL.xml"));
        Document doc = builder.build(new File("file.xml"));
        Element root = doc.getRootElement();
        for (Element testcase : root.getChildren()) {
            String id = testcase.getChildText("id");
            String testCaseName = testcase.getChildText("testCaseName");
            String expectedResult = testcase.getChildText("expectedResult");
            System.out.println(expectedResult);
            HashMap<String,String> parameters = new LinkedHashMap<String,String>();
            Element params = testcase.getChild("parameter");
            System.out.println(params);
            if (params != null ) {
                Iterator<Element> it = params.getChildren().iterator();
                while (it.hasNext()) {
                    Element key = it.next();
                    Element val = it.next();
                    parameters.put(key.getValue(), val.getValue());
                }
            }
            parameters.put("expectedResult", expectedResult);
            ObjectMapper obj = new ObjectMapper();
            String jsonString = obj.writeValueAsString(parameters);
            System.out.println(jsonString);

         }
        }
    }

My code is only reading the first set of key and value and not reading the other keys and values. The output is :-

{"expectedResult":"true"}
{"featues":"w,f","expectedResult":"true"}
{"projectType":"MEMOGEN","expectedResult":"true"}
{"projectType":"MEMOGEN","expectedResult":"empty"} 

I want the other key value also to be in the string. Can anyone please help and fix my code

Answer 1

You're using

testcase.getChild("parameter")

getChild() returns the first child element with the given name. You want all the children named "parameter". So you need to call

testcase.getChildren("parameter")

and iterate through all the returned elements.

Answer 2

Use Xpath This will help you to read many complex expressions from a xml.

Write a xslt which will take your xml as input and render your json. Xslt supports for, if loops as well. This is time efficient as well. I have parsed an xml of size 3 MB in 100 ms (I performed hundreds of operations inside xslt)

Answer 3

List<Element> params = testcase.getChildren("parameter");
            for(Element ele : params){
                String key = ele.getChildText("key");
                String value = ele.getChildText("value");
                parameters.put(key, value);
            }

I think this will solve my problem .