我正在尝试使用 javax.json API 漂亮地打印 json
我当前使用的代码如下:
private String prettyPrint(String json) {
StringWriter sw = new StringWriter();
try {
JsonReader jr = Json.createReader(new StringReader(json));
JsonObject jobj = jr.readObject();
Map<String, Object> properties = new HashMap<>(1);
properties.put(JsonGenerator.PRETTY_PRINTING, true);
JsonGeneratorFactory jf = Json.createGeneratorFactory(properties);
JsonGenerator jg = jf.createGenerator(sw);
jg.write(jobj).close();
} catch (Exception e) {
}
String prettyPrinted = sw.toString();
return prettyPrinted;
}
我收到以下异常:
11:47:08,830 ERROR [stderr] (EJB default - 1) javax.json.stream.JsonGenerationException: write(JsonValue) can only be called in array context
11:47:08,835 ERROR [stderr] (EJB default - 1) at org.glassfish.json.JsonGeneratorImpl.write(JsonGeneratorImpl.java:301)
11:47:08,838 ERROR [stderr] (EJB default - 1) at org.glassfish.json.JsonPrettyGeneratorImpl.write(JsonPrettyGeneratorImpl.java:55)
11:47:08,841 ERROR [stderr] (EJB default - 1) at org.proactive.rest.VideoFeedService.prettyPrint(VideoFeedService.java:247)
11:47:08,843 ERROR [stderr] (EJB default - 1) at org.proactive.rest.VideoFeedService.requestVideoFeedData(VideoFeedService.java:124)
11:47:08,845 ERROR [stderr] (EJB default - 1) at org.proactive.rest.VideoFeedService.run(VideoFeedService.java:86)
11:47:08,848 ERROR [stderr] (EJB default - 1) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
11:47:08,850 ERROR [stderr] (EJB default - 1) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
11:47:08,852 ERROR [stderr] (EJB default - 1) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
11:47:08,854 ERROR [stderr] (EJB default - 1) at java.lang.reflect.Method.invoke(Method.java:483)
您应该使用 JsonWriter 而不是 JsonGenerator。
替换这些行:
JsonGeneratorFactory jf = Json.createGeneratorFactory(properties);
JsonGenerator jg = jf.createGenerator(sw);
jg.write(jobj).close();
用这些:
JsonWriterFactory writerFactory = Json.createWriterFactory(properties);
JsonWriter jsonWriter = writerFactory.createWriter(sw);
jsonWriter.writeObject(jobj);
jsonWriter.close();
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