Java Json漂亮打印javax.json

  • Z时代
  • 2024-01-10
  • 分类：问答

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)

回答：

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();

以上是 Java Json漂亮打印javax.json 的全部内容， 来源链接： utcz.com/qa/401339.html

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