如何从 JSF 生成 JSON 响应? [英] How to generate JSON response from JSF?
问题描述
我创建了一个页面，我想在其中从 JSF 页面获取 JSON 响应，但是当我尝试获取页面时，它显示了整个 html 页面.
I have created a page where I want to get the JSON response from a JSF page, but when i try to get page it shows me whole html page.
<html xmlns="http://www.w3.org/1999/xhtml"><head>
<title>Facelet Title</title></head><body>
[{"value": "21", "name": "Mick Jagger"},{"value": "43", "name": "Johnny Storm"},{"value": "46", "name": "Richard Hatch"},{"value": "54", "name": "Kelly Slater"},{"value": "55", "name": "Rudy Hamilton"},{"value": "79", "name": "Michael Jordan"}]
</body></html>
推荐答案
JSF 是一个生成 HTML 的 MVC 框架，而不是某种 REST Web 服务框架.您实际上是在滥用 JSF 作为 Web 服务.您的具体问题只是由在视图文件 yourself 中放置 标签等引起的.
JSF is a MVC framework generating HTML, not some kind of a REST web service framework. You're essentially abusing JSF as a web service. Your concrete problem is simply caused by placing <html> tags and so on in the view file yourself.
如果你真的坚持，那么你总是可以通过使用 来实现这一点.您还需要确保使用了正确的 application/json 内容类型，这在 JSF 中默认为 text/html.
If you really insist, then you can always achieve this by using <ui:composition> instead of <html>. You also need to make sure that the right content type of application/json is been used, this defaults in JSF namely to text/html.
<ui:composition
xmlns:f="http://java.sun.com/jsf/core"
xmlns:ui="http://java.sun.com/jsf/facelets">
<f:event type="preRenderView" listener="#{bean.renderJson}" />
</ui:composition>
与
public void renderJson() throws IOException {
FacesContext facesContext = FacesContext.getCurrentInstance();
ExternalContext externalContext = facesContext.getExternalContext();
externalContext.setResponseContentType("application/json");
externalContext.setResponseCharacterEncoding("UTF-8");
externalContext.getResponseOutputWriter().write(someJsonString);
facesContext.responseComplete();
}
但我强烈建议您查看 JAX-RS 或 JAX-WS，而不是将 JSF 滥用为 JSON Web 服务.使用适合工作的工具.
But I strongly recommend to look at JAX-RS or JAX-WS instead of abusing JSF as a JSON web service. Use the right tool for the job.
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