JAVA新手提问：JAVA客户端通过SOAP与.NET的WebServices进行通信

Question

小生今日刚从.NET转入JAVA的一个项目，该项目要求用JAVA编写的客户端可以使用SOAP1.1，SOAP1.2与.NET的WebServices进行数据通信。为了测试，写了一个已有的WebServices，其请求的SOAP1.1示例为：POST /SoapSetup/Service.asmx HTTP/1.1
Host: 192.168.0.95
Content-Type: text/xml; charset=utf-8
Content-Length: length
SOAPAction: "http://tempuri.org/Operation"<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
  <soap:Body>
    <Operation xmlns="http://tempuri.org/">
      <indata>
        <strOperator>string</strOperator>
        <dOperand1>double</dOperand1>
        <dOperand2>double</dOperand2>
      </indata>
    </Operation>
  </soap:Body>
</soap:Envelope>现用JAVA编写的类如下：
package clientServices.soap;import java.io.*;
import java.net.*;
import javax.xml.parsers.*;
import org.w3c.dom.*;public class Soap {

private static String getSoapRequest(String strOperator,String dOperand1,String dOperand2)
{
try
{
    InputStream is=new FileInputStream("./clientServices/soap/OperationSoap.xml");
            InputStreamReader isr=new InputStreamReader(is);
            BufferedReader reader=new BufferedReader(isr);
            String soap="";
            String tmp;
            while((tmp=reader.readLine())!=null)
            {
                soap+=tmp;
            }            
            reader.close();
            isr.close();
        
            soap=soap.replace("${strOperator}$", strOperator);
            soap=soap.replace("${dOperand1}$", dOperand1);
            soap=soap.replace("${dOperand2}$", dOperand2);
            soap=soap.replace("${length}$", Integer.toString(soap.length()));
        
            return soap;
}
catch(Exception e)
{
    e.printStackTrace();
    return null;
}
}

/*
 * 返回InputStream是因为w3c DOM中Document的parse方法可
 * 以接受InputStream类型的参数，方面在下一步对XML的解释
 */
    private static InputStream getSoapInputStream(String strOperator,String dOperand1,String dOperand2)throws Exception
    {
        try
        {
            String soap=getSoapRequest(strOperator,dOperand1,dOperand2);
            if(soap==null)
            {
                return null;
            }
            URL url=new URL("http://192.168.0.95/SoapSetup/Service.asmx");
            URLConnection conn=url.openConnection();
            conn.setUseCaches(false);
            conn.setDoInput(true);
            conn.setDoOutput(true);            conn.setRequestProperty("Content-Length", Integer.toString(soap.length()));
            conn.setRequestProperty("Content-Type", "text/xml; charset=utf-8");
            conn.setRequestProperty("SOAPAction","http://tempuri.org/Operation");
            
            
            OutputStream os=conn.getOutputStream();
            OutputStreamWriter osw=new OutputStreamWriter(os,"utf-8");
            osw.write(soap);
            osw.flush();
            osw.close();            InputStream is=conn.getInputStream();
            return is;   
        }
        catch(Exception e)
        {
            e.printStackTrace();
            return null;
        }
    }
    
    /*
     * 用W3C DOM对返回的XML进行解释
     */
    public static String getValue(String strOperator,String dOperand1,String dOperand2)
    {
        try
        {
            Document doc;
            DocumentBuilderFactory dbf=DocumentBuilderFactory.newInstance();
            dbf.setNamespaceAware(true);
            DocumentBuilder db=dbf.newDocumentBuilder();
            InputStream is=getSoapInputStream(strOperator,dOperand1,dOperand2);
            doc=db.parse(is);
            NodeList nl=doc.getElementsByTagName("retValue");
            Node n=nl.item(0);
            String weather=n.getFirstChild().getNodeValue();
            is.close();
            return weather;
        }
        catch(Exception e)
        {
            e.printStackTrace();
            return null;
        }
    } /**
 * @param args
 */
public static void main(String[] args) {
// TODO 自动生成方法存根
System.out.println(Soap.getValue("+","45","56"));
}
}当程序执行到getSoapInputStream()函数中的InputStream is=conn.getInputStream();时就会返回一个为null的InputStream，导致程序出错。请问大家，为什么会发生这种问题，是不是还少写了部分功能代码呢？

Answer 1

                        OutputStream   os=conn.getOutputStream(); 
                        OutputStreamWriter   osw=new   OutputStreamWriter(os,"utf-8"); 
                        osw.write(soap); 
                        osw.flush(); 
                        osw.close(); // 去掉这一句                        InputStream   is=conn.getInputStream(); 

Answer 2

谢谢楼上的前辈指导，但是注释掉osw.close(); 后，异常依旧java.io.IOException: Server returned HTTP response code: 400 for URL: http://192.168.0.95/SoapSetup/Service.asmx
null
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1241)
at clientServices.soap.Soap.getSoapInputStream(Soap.java:70)
at clientServices.soap.Soap.getValue(Soap.java:93)
at clientServices.soap.Soap.main(Soap.java:113)
java.lang.IllegalArgumentException: InputStream cannot be null
at javax.xml.parsers.DocumentBuilder.parse(DocumentBuilder.java:120)
at clientServices.soap.Soap.getValue(Soap.java:94)
at clientServices.soap.Soap.main(Soap.java:113)在IE中，http://192.168.0.95/SoapSetup/Service.asmx是可以访问的。

Answer 3

有没有可能是因为WebServices上的类没有进行序列化的原因呢？

Answer 4

conn.setDoInput(true); 
conn.setDoOutput(true); 
con.setRequestMethod("POST"); // 你为何少了这个呢？400 错误就是请求无效

Answer 5

楼上的前辈：
URLConnection类并没有setRequestMethod()方法，因此使用HttpURLConnection conn=(HttpURLConnection)url.openConnection();进行强制转换URL url=new URL("http://192.168.0.95/SoapSetup/Service.asmx");
HttpURLConnection conn=(HttpURLConnection)url.openConnection();
conn.setUseCaches(false);
conn.setDoInput(true);
conn.setDoOutput(true);
conn.setRequestMethod("POST");
……
//osw.close();但是错误依旧……

Answer 6

.NET的WebServices上有方法如下：
[WebMethod]
public string Hello(string name)
{
   return "Hello! " + name;
}这次使用了另一种方法：package clientServices1.soap1;import org.apache.axis.client.Service;
import org.apache.axis.client.Call;
import javax.xml.namespace.QName;
import javax.xml.rpc.ParameterMode;public class Soap1 {
public static void main(String[] args) { String result = "";
try {
String name="Arieslns";
String endpoint = "http://192.168.0.95/SoapSetup/Service.asmx";
Service service = new Service();
Call call = (Call) service.createCall();
call.setTargetEndpointAddress(new java.net.URL(endpoint));
call.setOperationName(new QName("http://tempuri.org/", "Hello")); 
call.addParameter("name", org.apache.axis.Constants.XSD_STRING,ParameterMode.IN);
call.setReturnType(org.apache.axis.encoding.XMLType.XSD_STRING);
call.setUseSOAPAction(true);
call.setSOAPActionURI("http://tempuri.org/Hello");
result = (String)call.invoke(new Object[]{name});
} 
catch (Exception e) {
System.err.println(e.toString());
e.printStackTrace();
}
System.out.println(result);

}
}但是返回值的仅仅是在控制台输出的：Hello!
然后在WebServices方法中添加了：Flie.AppendAllText(@"C:\result.txt",name);
结果生成的文件没有任何内容，参数并没有传递到name变量中……

Answer 7

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在那里看看有无能回答你的,谢谢,LZ,甭忘了给俺分哦,谢谢LZ

Answer 8

第二种方法的问题解决了，原因出在这一句：
call.addParameter("name",   org.apache.axis.Constants.XSD_STRING,ParameterMode.IN);
因为addParameter()的第一个参数没有指定命名空间，所以找不到名为“name”的参数。
这样稍微修改下就可以了：
call.addParameter(new QName("http://tempuri.org/", "name"), org.apache.axis.encoding.XMLType.XSD_STRING,ParameterMode.IN);成功运行……激动啊……接下来研究传递复杂的数据类型去……