在javax.json.spi.JsonProvider.provider找不到提供者org.glassfish.json.JsonProviderImpl(JsonProvider.java:97)

Question

如何在eclipse中运行Java API for JSON Processing(JSR 374)？

我试图将JSON字符串解析为JsonParser(javax.json.stream.JsonParser).还在构建路径中添加了javax.json-api-1.0.jar.在运行时,有一个例外.我的代码是

import java.io.StringReader;
import javax.json.Json;
import javax.json.JsonReader;
import javax.json.JsonStructure;
import javax.json.stream.JsonParser;
import javax.json.stream.JsonParser.Event;
import javax.json.JsonReader;
import javax.json.JsonStructure;
import javax.json.stream.JsonParser;
import javax.json.stream.JsonParser.Event;
public class jsonnn {
public class jsonnn {
public static void main(String[] args) {
        // Parse back
        final String result = "{\"name\":\"Falco\",\"age\":3,\"bitable\":false}";
        final JsonParser parser = Json.createParser(new StringReader(result));
        String key = null;
        String value = null;
        while (parser.hasNext()) {
            final Event event = parser.next();
            switch (event) {
            case KEY_NAME:
                key = parser.getString();
                System.out.println(key);
                break;
            case VALUE_STRING:
                value = parser.getString();
                System.out.println(value);
                break;
            }
        }
        parser.close();
    }
}

例外是

Exception in thread "main" javax.json.JsonException: Provider org.glassfish.json.JsonProviderImpl not found
at javax.json.spi.JsonProvider.provider(JsonProvider.java:97)
at javax.json.Json.createParser(Json.java:90)
at jsonnn.main(jsonnn.java:14)
Caused by: java.lang.ClassNotFoundException: org.glassfish.json.JsonProviderImpl
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at javax.json.spi.JsonProvider.provider(JsonProvider.java:94)
... 2 more

Answer 1

您正在针对API进行开发,并且没有针对该API的实现.您需要确保实现JSON-P规范才能实际运行您尝试使用的代码.

在JSR 374官方网站入门指南中,它显示您需要两个 Maven依赖项 - 一个用于API,一个用于参考实现 - 然后才能使用JSON-P 1.1:

<dependency>
    <groupId>javax.json</groupId>
    <artifactId>javax.json-api</artifactId>
    <version>1.1</version>
</dependency>

<dependency>
    <groupId>org.glassfish</groupId>
    <artifactId>javax.json</artifactId>
    <version>1.1</version>
</dependency>

由于您似乎没有使用Maven,因此您需要手动从Maven Central下载实现JAR:http: //repo1.maven.org/maven2/org/glassfish/javax.json/1.1/

或者只需单击此直接链接即可下载JAR:javax.json-1.1.jar