该代码适用于仅具有单个操作的 wsdl，但对于具有多个操作标签的 wsdl，它会给出空指针异常。
Exception in thread "main" java.lang.NullPointerException
at project.Project.listInputs(Project.java:78)
at project.Project.main(Project.java:198)
编码：
package project;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashSet;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import org.w3c.dom.Document;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;
/**
*
* @author karthikbv
*/
public class Project {
/**
* @param args the command line arguments
*/
public String[] listOperations(String filename) throws FileNotFoundException, SAXException,IOException, ParserConfigurationException
{
Document d = (Document) DocumentBuilderFactory.newInstance().newDocumentBuilder().parse(new FileInputStream(filename));
NodeList elements = d.getElementsByTagName("wsdl:operation");
ArrayList<String> operations = new ArrayList<>();
for (int i = 0; i < elements.getLength(); i++) {
operations.add(elements.item(i).getAttributes().getNamedItem("name").getNodeValue());
}
return operations.toArray(new String[operations.size()]);
}
public String[] listOperationsUnique(String filename) throws FileNotFoundException,SAXException, IOException, ParserConfigurationException
{
String[] nonUnique = listOperations(filename);
HashSet<String> unique = new HashSet<>(Arrays.asList(nonUnique));
return unique.toArray(new String[unique.size()]);
}
public String[] listInputs(String filename) throws FileNotFoundException, SAXException,IOException, ParserConfigurationException, NullPointerException
{
Document d1 = (Document) DocumentBuilderFactory.newInstance().newDocumentBuilder().parse(new FileInputStream(filename));
NodeList elements1 = d1.getElementsByTagName("wsdl:input");
NodeList elements ;
NodeList ele = d1.getElementsByTagName("wsdl:message");
//ArrayList<String> tinput = new ArrayList<>();
ArrayList<String> tput = new ArrayList<>();
ArrayList<String> input = new ArrayList<>();
for(int k=0; k < elements1.getLength(); k++)
{
if(elements1.item(k).getAttributes().getNamedItem("message") != null)
{
input.add(elements1.item(k).getAttributes().getNamedItem("message").getNodeValue());
}
}
String[] s,s1,s2;
s1 = input.toArray(new String[input.size()]);
s= this.listMessages(filename);
for(int i=0;i<s1.length;i++)
{
for(int j=0;j<s.length;j++)
{
if((s1[i].substring(4)).equals(s[j]))
{
for (int k = 0; k < ele.getLength(); k++)
{
if(ele.item(k).getAttributes().getNamedItem("name").getNodeValue().equals(s[j]))
{
elements = ele.item(k).getChildNodes();
for(int l=0; l < elements.getLength(); l++)
{
if(elements.item(l).getAttributes() != null)
{
tput.add(elements.item(l).getAttributes().getNamedItem("type").getNodeValue());
}
}
}
}
}
}
}
s2 = tput.toArray(new String[tput.size()]);
return s2;
//return input.toArray(new String[input.size()]);
}
public String[] listMessages(String filename) throws FileNotFoundException, SAXException,IOException, ParserConfigurationException
{
Document d = (Document) DocumentBuilderFactory.newInstance().newDocumentBuilder().parse(new FileInputStream(filename));
NodeList elements = d.getElementsByTagName("wsdl:message");
ArrayList<String> messages = new ArrayList<>();
for (int i = 0; i < elements.getLength(); i++)
{
if(elements.item(i).getAttributes().getNamedItem("name") != null)
{
messages.add(elements.item(i).getAttributes().getNamedItem("name").getNodeValue());
}
}
return messages.toArray(new String[messages.size()]);
}
public String[] listMinputs(String filename) throws FileNotFoundException, SAXException,IOException, ParserConfigurationException, NullPointerException
{
Document d1 = (Document) DocumentBuilderFactory.newInstance().newDocumentBuilder().parse(new FileInputStream(filename));
NodeList melements1 = d1.getElementsByTagName("wsdl:part");
ArrayList<String> minput = new ArrayList<>();
int l,i;
l = melements1.getLength();
for(int k=0; k < l; k++)
{
if(melements1.item(k).getAttributes().getNamedItem("element") != null)
{
minput.add(melements1.item(k).getAttributes().getNamedItem("element").getNodeValue());
}
}
return minput.toArray(new String[minput.size()]);
}
/**
*
* @param args
* @throws FileNotFoundException
* @throws SAXException
* @throws IOException
* @throws ParserConfigurationException
*/
public static void main(String[] args) throws FileNotFoundException, SAXException, IOException, ParserConfigurationException, NullPointerException
{
// TODO code application logic here
Project p;
p = new Project();
System.out.println("Hi");
String uri;
uri = "C:/Users/karthikbv/Desktop/sample.wsdl";
String[] s, s1;
s = p.listOperationsUnique(uri);
s1 = p.listInputs(uri);
int len = s.length;
int len1 = s1.length;
System.out.println("Operations:");
for(int i=0; i<len; i++)
{
System.out.println(s[i]);
}
System.out.println("Input Params:");
for(int i=0; i<len1; i++)
{
System.out.println(s1[i]);
}
}
}