解决视图-Spring REST服务

如何解决解决视图-Spring REST服务

我想使用Spring从REST服务生成原始xml。解决视图时有些失落。我得到以下信息：

javax.servlet.ServletException: Circular view path [RemedyXml]: would dispatch back to the current handler URL [/audiClave/REST/remedies/RemedyXml] again. Check your ViewResolver setup! (Hint: This may be the result of an unspecified view,due to default view name generation.)

这是web.xml（缩写）：

<servlet>
    <servlet-name>rest</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>/WEB-INF/restServlet-context.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
</servlet>

<servlet-mapping>
    <servlet-name>rest</servlet-name>
    <url-pattern>/REST/</url-pattern>
</servlet-mapping>

restServlet-context.xml如下（缩写）：

<context:component-scan base-package=\"com.audiClave.controllers\" />
<bean id=\"beanNameResolver\" 
    class=\"org.springframework.web.servlet.view.BeanNameViewResolver\"/>
<bean id = \"RemedyXml\" class = \"com.audiClave.views.RemedyXmlView\"/>

现在为控制器：

@Controller
public class RestController{
private static final String REMEDIES = \"remedies\";

    @RequestMapping(value = \"/REST/remedies/{language}\",method = RequestMethod.GET)
    protected ModelAndView getAllRemedies(HttpServletResponse response,@PathVariable(\"language\") String language) throws IOException {
        Map<String,List<Remedy>> myModel = new HashMap<String,List<Remedy>>();
        RemediesBean remediesBean = Factory.getRemediesBean();
        myModel.put(\"remedies\",remediesBean.loadRemedies(language));
        return new ModelAndView(\"RemedyXml\",\"model\",myModel);

最后是视图：

public class RemedyXmlView implements View
{

  /** XML document */
  private Document doc = null;

  public RemedyXmlView()
  {
  }

  public String getContentType()
  {
    return \"text/xml\";
  }

@Override
  public void render(Map<String,?> model,HttpServletRequest request,HttpServletResponse response) 
    throws Exception {

    /** Generate the XML */
    // Start document with \"root\" tag
    this.doc = new Document(new Element(\"model\"));
    // Get the root tag
    Element rootEl = this.doc.getRootElement();

    // Add other tags
    Map<String,List<Remedy>> myModel = (Map<String,List<Remedy>>)model.get(\"model\");
    List<Remedy> messages = (List<Remedy>)myModel.get(\"remedies\");
    Iterator<Remedy> iter = messages.iterator();
    while(iter.hasNext()){
      Remedy remedy = iter.next();

      // Add new xml element
      Element messageEl = new Element(\"remedy\");
      messageEl.setText(remedy.getName());
      rootEl.addContent(messageEl);
    }

    // printXMLDocument(this.doc);

    /** Set response type and write XML */
    XMLOutputter outp = new XMLOutputter();
    outp.setFormat(Format.getPrettyFormat());
    String xmlAsString = outp.outputString(doc);

    response.setContentType(\"text/xml\");
    response.setContentLength(xmlAsString.length());

    PrintWriter out = new PrintWriter(response.getOutputStream());
    out.print(xmlAsString);
    out.flush();
    out.close();    
  }

} 任何输入将不胜感激，谢谢。     

解决方法

        我将视图移至.JSP实现，并用更少的代码解决了该问题。