Java Json漂亮打印javax.Json

我正试图用javax.json API漂亮地打印json

我目前使用的代码如下：

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;
    }

---

您应该使用JsonWriter而不是JsonGenerator

更换这些线路：

JsonGeneratorFactory jf = Json.createGeneratorFactory(properties);
JsonGenerator jg = jf.createGenerator(sw);

jg.write(jobj).close();

有了这些：

JsonWriterFactory writerFactory = Json.createWriterFactory(properties);
JsonWriter jsonWriter = writerFactory.createWriter(sw);

jsonWriter.writeObject(jobj);
jsonWriter.close();

---

下面是一个使用Jersey使用

javax.JSON

和

javax.ws.rs

漂亮打印（缩进）JSON的解决方案：

@GET
@Path("stuff")
public Response getStuff(@QueryParam("pretty") boolean pretty) {
    JsonArrayBuilder stuff = Json.createArrayBuilder().add("foo").add("bar");
    JsonObject jsonObject = Json.createObjectBuilder()
            .add("status", "OK")
            .add("data", stuff).build();
    if (pretty) {
        Map<String, Boolean> config = new HashMap<>();
        config.put(JsonGenerator.PRETTY_PRINTING, true);
        JsonWriterFactory jwf = Json.createWriterFactory(config);
        StringWriter sw = new StringWriter();
        try (JsonWriter jsonWriter = jwf.createWriter(sw)) {
            jsonWriter.writeObject(jsonObject);
        }
        // return "Content-Type: application/json", not "text/plain"
        MediaType mediaType = MediaType.APPLICATION_JSON_TYPE;
        return Response.ok(sw.toString(), mediaType).build();
    } else {
        return Response.ok(jsonObject).build();
    }

}

另见：

• JSR 353:JSON处理的Java API：
• 用于JSON处理的Java API（JSON-P）：
• 泽西岛：

---

您可以通过使用

JsonWriterFactory

实现漂亮的打印效果。这需要属性的配置映射

使用

JsonWriter

写入

StringWriter

我添加了一个方便的方法，它已经为您传递了

PRETTY\u PRINTING

标志

public static String prettyPrint(JsonStructure json) {
    return jsonFormat(json, JsonGenerator.PRETTY_PRINTING);
}

public static String jsonFormat(JsonStructure json, String... options) {
    StringWriter stringWriter = new StringWriter();
    Map<String, Boolean> config = buildConfig(options);
    JsonWriterFactory writerFactory = Json.createWriterFactory(config);
    JsonWriter jsonWriter = writerFactory.createWriter(stringWriter);

    jsonWriter.write(json);
    jsonWriter.close();

    return stringWriter.toString();
}

private static Map<String, Boolean> buildConfig(String... options) {
    Map<String, Boolean> config = new HashMap<String, Boolean>();

    if (options != null) {
        for (String option : options) {
            config.put(option, true);
        }
    }

    return config;
}

公共静态字符串预打印（JsonStructure json）{
返回jsonFormat（json，JsonGenerator.PRETTY_PRINTING）；
}
公共静态字符串jsonFormat（JsonStructure json、字符串…选项）{
StringWriter StringWriter=新StringWriter（）；
Map config=buildConfig（选项）；
JsonWriterFactory writerFactory=Json.createWriterFactory（config）；
JsonWriter=writerFactory.createWriter（stringWriter）；
jsonWriter.write（json）；
jsonWriter.close（）；
返回stringWriter.toString（）；
}
私有静态映射buildConfig（字符串…选项）{
Map config=newhashmap（）；
如果（选项！=null）{
用于（字符串选项：选项）{
config.put（选项，true）；
}
}
返回配置；
}

永远不要清空捕获物。永远不会。原谅我的懒惰，你是对的。我已经更新了帖子。似乎jg.write（jobj.close（）；这是一个可以用来快速检查JSON的问题。

$ curl -i http://localhost:8080/api/stuff?pretty=true
HTTP/1.1 200 OK
Content-Type: application/json
Date: Fri, 08 Aug 2014 14:32:40 GMT
Content-Length: 71


{
    "status":"OK",
    "data":[
        "foo",
        "bar"
    ]
} 
$ curl http://localhost:8080/api/stuff
{"status":"OK","data":["foo","bar"]}

public static String prettyPrint(JsonStructure json) {
    return jsonFormat(json, JsonGenerator.PRETTY_PRINTING);
}

public static String jsonFormat(JsonStructure json, String... options) {
    StringWriter stringWriter = new StringWriter();
    Map<String, Boolean> config = buildConfig(options);
    JsonWriterFactory writerFactory = Json.createWriterFactory(config);
    JsonWriter jsonWriter = writerFactory.createWriter(stringWriter);

    jsonWriter.write(json);
    jsonWriter.close();

    return stringWriter.toString();
}

private static Map<String, Boolean> buildConfig(String... options) {
    Map<String, Boolean> config = new HashMap<String, Boolean>();

    if (options != null) {
        for (String option : options) {
            config.put(option, true);
        }
    }

    return config;
}