如何从Web服务返回XML [英] How to return XML from web service

问题描述

这可能是疯狂/愚蠢/愚蠢/冗长的问题之一，因为我是网络服务的新手。

我想写一个Web服务，它将以XML格式返回答案（我正在使用我的YUI自动完成服务）。我正在使用Eclipse和Axis2并遵循 http://www.softwareagility.gr/index .php？q = node / 21
我希望以下列格式回复

This may be one of the insane / stupid / dumb / lengthy questions as I am newbie to web services.
I want to write a web service which will return answer in XML format (I am using my service for YUI autocomplete). I am using Eclipse and Axis2 and following http://www.softwareagility.gr/index.php?q=node/21 I want response in following format

<codes>
<code value="Pegfilgrastim"/>
<code value="Peggs"/>
<code value="Peggy"/>
<code value="Peginterferon alfa-2 b"/>
<code value="Pegram"/>
</codes>

代码元素的数量可能会有所不同，具体取决于响应。
直到现在我尝试了以下方法：
1）使用String buffer创建XML并返回字符串。（我提供部分代码以避免混淆）

Number of code elements may vary depending on response. Till now I tried following ways
1) Create XML using String buffer and return the string.(I am providing partial code to avoid confusion)

public String myService ()
{    
    // Some other stuff
    StringBuffer outputXML = new StringBuffer();
    outputXML.append("<?xml version='1.0' standalone='yes'?>");
    outputXML.append("<codes>");
    while(SOME_CONDITION)
    {
       // Some business logic
       outputXML.append("<code value=\""+tempStr+"\">"+"</code>");    
    }
    outputXML.append("</codes>");
    return (outputXML.toString());  
}

它提供以下不需要的< ns的响应： myServiceResponse> 和< ns：return> 元素。

It gives following response with unwanted <ns:myServiceResponse> and <ns:return> element.

<ns:myServiceResponse>
<ns:return>
<?xml version='1.0' standalone='yes'?><codes><code value="Peg-shaped teeth"></code><code value="Pegaspargase"></code><code value="Pegfilgrastim"></code><code value="Peggs"></code><code value="Peggy"></code><code value="Peginterferon alfa-2 b"></code><code value="Pegram"></code></codes>
</ns:return>
</ns:findTermsResponse>    

但它与YUI自动完成功能无关（可能是因为它需要上述格式的响应）

2）使用DocumentBuilderFactory ：

赞

But it didnt work with YUI autocomplete (May be because it required response in format mentioned above)
2) Using DocumentBuilderFactory :
Like

public Element myService ()
{
    DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
    DocumentBuilder docBuilder = factory.newDocumentBuilder();
    Document doc = docBuilder.newDocument();
    Element codes = doc.createElement("codes");
    while(SOME_CONDITION)
    {
      // Some business logic
      Element code = doc.createElement("code");
      code.setAttribute("value", tempStr);
      codes.appendChild(code);
    }
    return(codes);
}  

出现以下错误

org.apache.axis2.AxisFault: Mapping qname not fond for the package: com.sun.org.apache.xerces.internal.dom  

3）使用servlet：我尝试使用简单的servlet获得相同的响应并且它有效。这是我的servlet

3) Using servlet : I tried to get same response using simple servlet and it worked. Here is my servlet

protected void doGet(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException
  {
    StringBuffer outputXML = new StringBuffer();
    response.setContentType("text/xml");
    PrintWriter out = response.getWriter();
    outputXML.append("<?xml version='1.0' standalone='yes'?>");
    outputXML.append("<codes>"); 
    while(SOME_CONDITION)
    {
        // Some business logic
        outputXML.append("<code value=\"" + tempStr + "\">" + "</code>");    
    }
    outputXML.append("</codes>");
    out.println(outputXML.toString());
}

它给出了与上面提到的相同的响应，它与YUI自动完成无关标签。

It gave response same as mentioned above and it worked with YUI autocomplete without any extra tag.

请问您能告诉我如何在没有任何不需要的元素的情况下获得XML响应？

Please can you tell how can I get XML response without any unwanted elements ?

谢谢。

推荐答案

最后让它工作，虽然我不是能够删除不需要的元素。 （在所有事情都到位之前我都不打扰）。我使用AXIOM来生成响应。

Finally got it work though I am not able to remove unwanted element. (I don't bother till all things are in place). I used AXIOM to generate response.

public OMElement myService ()
{
    OMFactory fac = OMAbstractFactory.getOMFactory();
    OMNamespace omNs = fac.createOMNamespace("", "");
    OMElement codes = fac.createOMElement("codes", omNs);
    while(SOME_CONDITION)
    {
       OMElement code = fac.createOMElement("code", null, codes);
       OMAttribute value = fac.createOMAttribute("value", null, tempStr);
       code.addAttribute(value);
    }
    return(codes); 
}

链接：1） http://songcuulong.com/public/html/webservice/create_ws.html

2） http://sv.tomicom.ac.jp /~koba/axis2-1.3/docs/xdocs/1_3/rest-ws.html

这篇关于如何从Web服务返回XML的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！