一尘不染

如何手动将Spring MVC视图呈现为html?

spring-mvc

是否可以在我的控制器映射方法中将视图呈现为html,以便我可以将呈现的html作为json对象的一部分返回?

我通常的控制器方法示例:

@RequestMapping(value={"/accounts/{accountId}"}, method=RequestMethod.GET)
public String viewAcc(final HttpServletRequest req, 
        final HttpServletResponse resp, final Model model,
        @PathVariable("accountId") final String docId) {

    // do usual processing ...

    // return only a STRING value, 
    //   which will be used by spring MVC to resolve into myview.jsp or myview.ftl
    //   and populate the model to the template to result in html
    return "myview";
}

我期望什么:

@RequestMapping(value={"/accounts/{accountId}"}, method=RequestMethod.GET)
public String viewAcc(final HttpServletRequest req, 
        final HttpServletResponse resp, final Model model,
        @PathVariable("accountId") final String docId) {

    // do usual processing ...

    // manually create the view
    ModelAndView view = ... ? (how)

    // translate the view to the html
    //   and get the rendered html from the view
    String renderedHtml = view.render .. ? (how)

    // create a json containing the html
    String jsonString = "{ 'html' : " + escapeForJson(renderedHtml) + "}"

    try {
        out = response.getWriter();
        out.write(jsonString);
    } catch (IOException e) {
        // handle the exception somehow
    }

    return null;
}

我不知道什么是在控制器方法内创建视图并将视图手动呈现为html的正确方法。

更新资料

这是公认的答案指导下的工作示例:

View resolvedView = thiz.viewResolver.resolveViewName("myViewName", Locale.US);
MockHttpServletResponse mockResp = new MockHttpServletResponse();
resolvedView.render(model.asMap(), req, mockResp);
System.out.println("rendered html : " + mockResp.getContentAsString());

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2020-06-01

共1个答案

一尘不染

尝试自动装配ViewResolver,然后调用resolveViewName("myview", Locale.US)获取视图。

然后render()在视图上调用,并向其传递一个“模拟”
HTTP响应,该响应具有用于输出的ByteArrayOutputStream,并从ByteArrayOutputStream获取HTML。

更新资料

这是从问题复制而来的工作示例。(所以代码实际上就是答案)

View resolvedView = thiz.viewResolver.resolveViewName("myViewName", Locale.US);
MockHttpServletResponse mockResp = new MockHttpServletResponse();
resolvedView.render(model.asMap(), req, mockResp);
System.out.println("rendered html : " + mockResp.getContentAsString());
2020-06-01