在 AEM 的 Servlet 中获取 JSP 输出

Question

在 CQ 中，我们需要在 servlet 中处理 jsp 然后将结果与我们从服务器获得的其他结果组合起来，然后再写回浏览器。

下面的代码几乎就是我们所需要的，只是它在处理完jsp.

后将结果写回浏览器

RequestDispatcher dispatcher = request.getRequestDispatcher(resource);
dispatcher.forward(request, response);

我们尝试使用如下模拟响应：

RequestData requestData = new RequestData(slingRequestProcessor, request, mockResponse);
SlingHttpServletRequest slingRequest = requestData.getSlingRequest();
SlingHttpServletResponse slingResponse = requestData.getSlingResponse();
RequestDispatcher dispatcher = request.getRequestDispatcher(resource);
dispatcher.forward(slingRequest, slingResponse);

但我们遇到了问题。

Answer 1

首先 - 根据您的描述，您似乎想使用 requestDispatcher.include 而不是 requestDispatcher.forward。

关于响应内容的包含，您传递给 requestDispatcher.include 调用的响应可以是您自己创建的对象，它将其输出写入字符串而不是将其返回给浏览器。以下内容可能是合适的：

final ServletOutputStream outputStream = new ServletOutputStream() {
    public void write(int b) throws IOException {
        outputBuffer.append((char) b);
    }
};

SlingHttpServletResponseWrapper responseWrapper = new SlingHttpServletResponseWrapper(response) {
    public ServletOutputStream getOutputStream() {
        return outputStream;
    }

    public PrintWriter getWriter() throws IOException {
        return new PrintWriter(outputBuffer);
    }

    public SlingHttpServletResponse getSlingResponse() {
        return super.getSlingResponse();
    }
};

包含后outputStream.toString()应该提供资源请求的执行结果。

Answer 2

综合所有反馈，我们得出以下结论：

    //Map<String, Object> jstlValues, final Map<String, Object> propertyValues, String resourceType, SlingHttpServletRequest request, SlingHttpServletResponse response

    final StringWriter outputBuffer = new StringWriter();
    SlingHttpServletResponseWrapper responseWrapper = new SlingHttpServletResponseWrapper(response) {
        public PrintWriter getWriter() throws IOException {
            return new PrintWriter(outputBuffer);
        }

        public SlingHttpServletResponse getSlingResponse() {
            return super.getSlingResponse();
        }
    };

    ResourceMetadata resourceMetaData = new ResourceMetadata();
    resourceMetaData.setResolutionPath("/dummy");
    for (Map.Entry<String, Object> entry: jstlValues.entrySet()) {
        request.setAttribute(entry.getKey(), entry.getValue());
    }

    SyntheticResource resource = new SyntheticResource(request.getResourceResolver(), resourceMetaData, resourceType) {
        public <T> T adaptTo(Class<T> type) { 
             if (type == ValueMap.class) { 
                 ValueMap m = new ValueMapDecorator(propertyValues); 
                 return (T) m; 
             } 
             return super.adaptTo(type); 
         } 
    };
    RequestDispatcher dispatcher = request.getRequestDispatcher(resource);
    dispatcher.include(request, responseWrapper);

    return outputBuffer.toString();

在 AEM 的 Servlet 中获取 JSP 输出

Get JSP output within Servlet in AEM

java

jsp

servlets

aem