How to get JSON response from JSF?_H5之家 - 中国HTML5教程资源分享第一站

Many JavaScript widgets expect data and options in JSON format. Nowadays, it is really easy to choose a cool widget and wrap it in a composite component. But the first question is how to send an AJAX request and to recieve a

response in a proper JSON format. This question is often raised by JSF users. All that you need is a XHTML facelet like this one:

1 <f:view encoding="UTF-8" contentType="text/html"

2 xmlns=""

3 xmlns:h=""

4 xmlns:f="">

5 <h:outputText value="#{stationView.getClosestStations(param.longitude, param.latitude)}" escape="false"/>

6 </f:view>

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Please consider the contentType=”text/html” (application/json will not work here) and escape=”false” in the hutputText. The method getClosestStations() in the bean StationView produces an JSON output for a list of special Java

objects. I advise to use the Gson library in order to serialize any Java object to JSON. Short example:

1 String[] strings = {"abc", "def", "ghi"};

2 Gson gson = new Gson();

3 gson.toJson(strings); ==> prints ["abc", "def", "ghi"]

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