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The render() method of the View interface returns void. The buck stops here as far as Spring MVC is concerned; it is the responsibility of the view not just to generate the content but to actually return it to the client too, if appropriate. We could, therefore, successfully implement a view with the example in Listing 7-2. Listing 7-2. Example View Implementation public class ModelIteratorView implements View { public void render(Map model, HttpServletRequest request, HttpServletResponse response) throws Exception { PrintWriter out = new PrintWriter(response.getOutputStream()); for (Object key : model.keySet()) { out.print(key.toString()); out.print(" = "); out.println(model.get(key)); } out.flush(); out.close(); } } OK, so it won t win your website any design awards, but you re fulfilling the very basic requirement of a View. Spring provides many implementations of View that act as hooks for the supported view technologies for example, InternalResourceView (JSP), VelocityView, AbstractXsltView, and others. We ll cover the specifics of these and others in 8 as we examine the major view technologies in more detail.
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CHAPTER 7 THE VIEW LAYER
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AbstractJasperReportsView
RedirectView
InternalResourceView
AbstractTemplateView
JasperReportsMultiFormatView AbstractJasperReportsSIngleFormatView
JstlView
TilesView
FreeMarkerView
VelocityView
JasperReportsCsvView
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VelocityToolboxView
JasperReportsPdfView
JasperReportsHtmlView VelocityLayoutView
For now, we ll have a quick tour of some of the common supporting functionality that Spring implements and how it applies to the diverse range of subclasses. Figure 7-1 shows the hierarchy of Views that Spring implements for you.
Figure 7-1. View hierarchy
CHAPTER 7 THE VIEW LAYER
The preceding diagram shows that all of the Spring View implementations extend AbstractView and that the majority also descend from AbstractUrlBasedView. Figure 7-2 shows more detail for these classes.
interface View + render(model : Map, request : HttpServletRequest, response : HttpServletResponse)
interface BeanNameAware + setBeanName(name : String)
interface InitializingBean + afterPropertiesSet()
AbstractView +DEFAULT CONTENT TYPE : String - beanName : String - contentType : String - requestContextAttitude : String - staticAttributes : HashMap + setBeanName(beanName : String) + getBeanName() : String + setContentType(contentType : String) + getContentType() : String + setRequestContextAttribute(requestContextAttitude : String) + getRequestContextAttribute() : String + setAttributesCSV(propString : String) + setAttributes(props : Properties) + setAttributesMap(attributes : Map) + getAttributesMap() : Map + addStaticAttribute(name : String, value : Object) + getStaticAttributes() : Map + render(model : Map, request : HttpServletRequest, response : HttpServletResponse) # createRequestContext(request : HttpServletRequest, model : Map) : support.RequestContext # renderMergedOutputModel(model : Map, request : HttpServletRequest, response : HttpServletResponse) + toString() : String
AbstractUrlBasedView - url : String + setUrl(url : String) + getUrl() : String + afterPropertiesSet() + toString() : String
Figure 7-2. Abstract superclass detail in the View hierarchy Spring views don t necessarily need to be HTML-based. In many cases, entirely different content types, including binary, can be rendered to the client. All Spring views support the ability to determine their own content type through AbstractView.setContentType().
CHAPTER 7 THE VIEW LAYER
By default, this will have the value text/html; charset=ISO-8859-1, and this is appropriate for any view rendering HTML with a Latin character set. The value of the contentType attribute will be used to set the appropriate HTTP headers in the response stream. This indicates to the client device how it should respond. Setting the contentType to a binary MIME type, for example, is likely to cause your browser to pop up a dialog box asking if you want to save the file (or possibly launch it if your machine has an application registered to handle that particular MIME type). Figure 7-3 shows just such an example of a content type that was set in the HTTP response of x-application/pdf.
Figure 7-3. Browser response to a different content type header value AbstractView offers the ability to set static attributes on your View instance too. These attributes are independent of the dynamic model generated by the Controllers, and you can set them programmatically or as part of the view configuration. They are useful for including additional data in the view that you don t want to hard-code into, for example, your JSPs or Velocity templates. AbstractView s second contribution to the implementation of your views is the option of declaring a requestContextAttribute name. Setting a value for this will expose the Spring RequestContext object to your view under the name you specified. The RequestContext holds request-specific information such as the theme, locale, binding errors, and localized messages. Support for command and error binding in Velocity and FreeMarker views is based upon exposure of the RequestContext. Listings 7-3 and 7-4 show how you can use static attributes. Listing 7-3. Setting Static Attributes View view = new InternalResourceView("path"); view.addAttribute("companyName", getThisYearsCompanyName()); view.addAttribute("season", "Summer"); Listing 7-4. Using Attributes in a JSTL View <p>The name of our company (this year at least) is: ${companyName}</p> <p>Welcome to our ${season} season of products</p>
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