与 SyntheticResource 一起前行
Sling Forward with SyntheticResource
我正在尝试构建一个 Sling servlet,它 return 是来自 JCR 的资源的修改值。我不想更改原始资源,因此我创建了一个 SyntheticResource 并进行了操作。然后我 return 使用 RequestDispatcher 返回它。
以下代码没有 return 预期的修改内容,我也没有在日志中看到任何错误。你能告诉我我做错了什么吗
@SlingServlet(methods = "GET", resourceTypes = "sling/components/test", selectors = "test")
public class TestServlet extends SlingSafeMethodsServlet {
/**
*
*/
private static final long serialVersionUID = 4078524820231933974L;
private final Logger log = LoggerFactory.getLogger(getClass());
@Reference
ResourceResolverFactory resolverFactory;
protected void doGet(SlingHttpServletRequest request, SlingHttpServletResponse response) throws IOException {
Map<String, Object> param = new HashMap<String, Object>();
ResourceResolver resolver = null;
response.setContentType("text/html");
StringWriterResponse writerResponse = new StringWriterResponse(response);
PrintWriter writer = response.getWriter();
try {
param.put(ResourceResolverFactory.SUBSERVICE, "testService");
final String path = request.getRequestPathInfo().getResourcePath();
resolver = resolverFactory.getServiceResourceResolver(param);
final Resource resource = resolver.getResource(path);
String resourceType = resource.getResourceType();
Resource testResource = new SyntheticResource(resolver,
path, resourceType) {
public <T> T adaptTo(Class<T> type) {
if (type == ValueMap.class) {
ModifiableValueMap map = resource
.adaptTo(ModifiableValueMap.class);
map.put("jcr:title", "Modified Title");
return (T)map;
}
return super.adaptTo(type);
}
};
RequestDispatcherOptions requestDispatcherOptions = new RequestDispatcherOptions();
requestDispatcherOptions.setReplaceSelectors("");
final RequestDispatcher requestDispatcher = request.getRequestDispatcher(testResource, requestDispatcherOptions);
requestDispatcher.forward(request, writerResponse);
// log.debug( writerResponse.getString() );
writer.println(writerResponse.getString());
response.setStatus(HttpServletResponse.SC_OK );
} catch (Exception e) {
log.error("Exception: ", e);
} finally {
if( resolver != null) {
resolver.close();
}
if( writer != null ){
writer.close();
}
if (writerResponse != null) {
writerResponse.clearWriter();
}
}
}
}
使用 ResourceDecorator 会更简单,它可以 return 实现所需更改的 ResourceWrapper
。当调用它不想装饰的 Resource
时,请注意保持装饰器的 decorate
方法高效,因为它将为所有 Resources
.[=15= 调用]
我正在尝试构建一个 Sling servlet,它 return 是来自 JCR 的资源的修改值。我不想更改原始资源,因此我创建了一个 SyntheticResource 并进行了操作。然后我 return 使用 RequestDispatcher 返回它。
以下代码没有 return 预期的修改内容,我也没有在日志中看到任何错误。你能告诉我我做错了什么吗
@SlingServlet(methods = "GET", resourceTypes = "sling/components/test", selectors = "test")
public class TestServlet extends SlingSafeMethodsServlet {
/**
*
*/
private static final long serialVersionUID = 4078524820231933974L;
private final Logger log = LoggerFactory.getLogger(getClass());
@Reference
ResourceResolverFactory resolverFactory;
protected void doGet(SlingHttpServletRequest request, SlingHttpServletResponse response) throws IOException {
Map<String, Object> param = new HashMap<String, Object>();
ResourceResolver resolver = null;
response.setContentType("text/html");
StringWriterResponse writerResponse = new StringWriterResponse(response);
PrintWriter writer = response.getWriter();
try {
param.put(ResourceResolverFactory.SUBSERVICE, "testService");
final String path = request.getRequestPathInfo().getResourcePath();
resolver = resolverFactory.getServiceResourceResolver(param);
final Resource resource = resolver.getResource(path);
String resourceType = resource.getResourceType();
Resource testResource = new SyntheticResource(resolver,
path, resourceType) {
public <T> T adaptTo(Class<T> type) {
if (type == ValueMap.class) {
ModifiableValueMap map = resource
.adaptTo(ModifiableValueMap.class);
map.put("jcr:title", "Modified Title");
return (T)map;
}
return super.adaptTo(type);
}
};
RequestDispatcherOptions requestDispatcherOptions = new RequestDispatcherOptions();
requestDispatcherOptions.setReplaceSelectors("");
final RequestDispatcher requestDispatcher = request.getRequestDispatcher(testResource, requestDispatcherOptions);
requestDispatcher.forward(request, writerResponse);
// log.debug( writerResponse.getString() );
writer.println(writerResponse.getString());
response.setStatus(HttpServletResponse.SC_OK );
} catch (Exception e) {
log.error("Exception: ", e);
} finally {
if( resolver != null) {
resolver.close();
}
if( writer != null ){
writer.close();
}
if (writerResponse != null) {
writerResponse.clearWriter();
}
}
}
}
使用 ResourceDecorator 会更简单,它可以 return 实现所需更改的 ResourceWrapper
。当调用它不想装饰的 Resource
时,请注意保持装饰器的 decorate
方法高效,因为它将为所有 Resources
.[=15= 调用]