json - 我想用一个整数数组作为 Java 中的值向 JSON 对象添加一个属性

Question

我想创建一个 JSON 对象，其中一个属性的值是一个数组，它应该如下所示:

{
  "id": 1,
  "name": "Whatever",
  "indices": [1, 2, 3, 4]
}

运行以下代码:

private void createJsonWithArrayAsPropertyValue() throws IOException {
    JsonObjectBuilder job = Json.createObjectBuilder();
    job.add("id", 1);
    job.add("name", "no-name");
    job.add("indices", Json.createArrayBuilder()
            .add(1)
            .add(2)
            .add(3)
            .build());
    System.out.println(new StringBuffer("\tJSON String = ").append(job.toString()).append("\n"));

    JsonObject jsonObject = job.build();
    Writer writer = new StringWriter();

    //  region Print the JSON object into a String
    Json.createWriter(writer).write(jsonObject);
    StringBuffer jsonString = new StringBuffer(writer.toString());
    System.out.println(new StringBuffer("\tjsonString = ").append(jsonString).append("\n"));
    //  endregion

    //  region Print the JSON using PRETTY_PRINTING format
    Map<String, Boolean> config = new HashMap<>();
    config.put(JsonGenerator.PRETTY_PRINTING, true);
    JsonWriterFactory writerFactory = Json.createWriterFactory(config);
    writer = new StringWriter();
    writerFactory.createWriter(writer).write(jsonObject);
    jsonString = new StringBuffer(writer.toString());
    System.out.println(new StringBuffer("\tjsonString (PRETTY_PRINTING) = ").append(jsonString).append("\n"));
    //  endregion Print the JSON using PRETTY_PRINTING format
    System.out.println("-------------------------------------------------");

}

使用 com.json.JSONObject 创建 JSON 对象索引属性作为字符串输入:

{
  "id": 1,
  "name": "Whatever",
  "indices": "[1, 2, 3]"
}

我正在寻找一种不会将元素值作为字符串输入的解决方案，而且我不限于使用任何特定的包。

更新 使用 javax.json.Json像这样:

    jo.put("indices", Json.createArrayBuilder()
            .add(1)
            .add(2)
            .add(3)
            .build());

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.0.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.beniregev</groupId>
    <artifactId>demos_and_tutorials</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>demos_and_tutorials</name>
    <description>Java 8 + Spring Boot project for demos and tutorials</description>

    <properties>
        <java.version>1.8</java.version>
        <spring-cloud.version>Hoxton.RC1</spring-cloud.version>
        <javafaker.version>0.17.2</javafaker.version>
        <mapdb.version>3.0.7</mapdb.version>
        <android-json.version>0.0.20131108.vaadin1</android-json.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-amqp</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jdbc</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-rest</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-oauth2-client</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-oauth2-resource-server</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-security</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-websocket</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.session</groupId>
            <artifactId>spring-session-jdbc</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <!-- https://mvnrepository.com/artifact/javax.json/javax.json-api -->
        <dependency>
            <groupId>javax.json</groupId>
            <artifactId>javax.json-api</artifactId>
            <version>1.1.4</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.glassfish/javax.json -->
        <dependency>
            <groupId>org.glassfish</groupId>
            <artifactId>javax.json</artifactId>
            <version>1.1.4</version>
        </dependency>
        <dependency>
            <groupId>org.postgresql</groupId>
            <artifactId>postgresql</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>com.github.javafaker</groupId>
            <artifactId>javafaker</artifactId>
            <version>${javafaker.version}</version>
        </dependency>
        <dependency>
            <groupId>io.projectreactor</groupId>
            <artifactId>reactor-test</artifactId>
            <scope>test</scope>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.mapdb/mapdb -->
        <dependency>
            <groupId>org.mapdb</groupId>
            <artifactId>mapdb</artifactId>
            <version>${mapdb.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.amqp</groupId>
            <artifactId>spring-rabbit-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.security</groupId>
            <artifactId>spring-security-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>com.vaadin.external.google</groupId>
            <artifactId>android-json</artifactId>
            <version>${android-json.version}</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

    <repositories>
        <repository>
            <id>spring-milestones</id>
            <name>Spring Milestones</name>
            <url>https://repo.spring.io/milestone</url>
        </repository>
    </repositories>

</project>

更新 2:我为 org.glassfish 添加了依赖，所以 javax.json可以运行，正如它在 Java JSON Tutorial - JSON Java 上所说的那样以及 Java API for JSON Processing - Getting Started .
更新 3 由于我的 pom.xml 中的依赖项之间的冲突而得到的异常，我将我的代码移动到一个单独的项目和 它有效 .

我收到一个异常(我在 pom.xml 中遗漏了什么？):

javax.json.JsonException: Provider org.glassfish.json.JsonProviderImpl not found
    at javax.json.spi.JsonProvider.provider(JsonProvider.java:99)
    at javax.json.Json.createArrayBuilder(Json.java:262)
    at com.beniregev.demos_and_tutorials.demos.JsonDemo.simpleJsonObjectWithArrayAsValue(JsonDemo.java:41)
    at com.beniregev.demos_and_tutorials.demos.JsonDemo.main(JsonDemo.java:57)
Caused by: java.lang.ClassNotFoundException: org.glassfish.json.JsonProviderImpl
    at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:581)
    at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
    at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
    at java.base/java.lang.Class.forName0(Native Method)
    at java.base/java.lang.Class.forName(Class.java:315)
    at javax.json.spi.JsonProvider.provider(JsonProvider.java:96)
    ... 3 more

我将不胜感激任何帮助。

Answer 1

每 docs在 JSONObject您需要使用 Json.createArrayBuilder() :

private void simpleJsonObjectWithArrayAsValue() throws JSONException {
    JSONObject jo = new JsonObject();
    jo.put("id", Json.createValue(1));
    jo.put("name", Json.createValue("Whatever"));
    jo.put("indices", Json.createArrayBuilder()
        .add(1)
        .add(2)
        .add(3)
        .build());

    System.out.println("JSON String = " + new StringBuffer().append(jo.toString() + "\n");
}

如果你有一个现有的数组，你需要遍历它并调用 .add()对于每个元素。