java - IBM Watson Visual Recognition 参数方法不会隐式接受字符串

Question

我使用 Windows 构建器创建了一个程序，以使用 IBM Watson 服务创建自定义分类器，一切正常，但我在使用文本文件中的分类器 ID 进行图像分类时遇到问题。

当我将自定义分类器 ID 放入代码中时，它工作正常，但当我尝试从 TextField 获取该 ID 时，它无法工作。

这是按钮操作事件中的代码。变量 String id 准确输出 parameters 方法中的内容，但它用 TextField 中的 id 替换 id (cats_599303326)，但是当我将 id 作为参数放入 parameters 方法中时，程序将无法成功运行。

另一方面，如果我注释所有内容并仅输出 id 字符串，将其复制并粘贴到 parameters 方法中，则效果很好。

为什么我传递变量id时不起作用？

VisualRecognition service = new VisualRecognition(
        VisualRecognition.VERSION_DATE_2016_05_20
);
service.setEndPoint("https://gateway-a.watsonplatform.net/visual-recognition/api");
service.setApiKey("{api-key}");
File imagesStream = new File(textField.getText());
ClassifyOptions classifyOptions = null;
String id = String.format("\"{\\\"classifier_ids\\\": [\\\"%s\\\"]}\"", textField_1.getText());
System.out.println(id);

try {
    classifyOptions = new ClassifyOptions.Builder()
            .imagesFile(imagesStream)
            .imagesFilename("Image ")
            .parameters("{\"classifier_ids\": [\"cats_599303326\"]}") //inside the parameters method, the goal is to replace cats_599303326 with an id given from a textfield
            .build();
} catch (FileNotFoundException e1) {

    e1.printStackTrace();
}
ClassifiedImages result = service.classify(classifyOptions).execute();
System.out.println(result);

将变量id作为参数放入parameters方法中时出现错误日志，正如我之前所说，如果我只是打印id字符串，将其复制并粘贴到parameters方法中作为参数，程序将成功运行，但如果将其作为变量，则不会运行:

Jan 10, 2018 6:07:55 AM okhttp3.internal.platform.Platform log
INFO: --> POST https://gateway-a.watsonplatform.net/visual-recognition/api/v3/classify?version=2016-05-20&api_key=aca4433597018de62edafdeebceb2bdc1482496a http/1.1 (-1-byte body)
Jan 10, 2018 6:08:06 AM okhttp3.internal.platform.Platform log
INFO: <-- 400 Bad Request https://gateway-a.watsonplatform.net/visual-recognition/api/v3/classify?version=2016-05-20&api_key=aca4433597018de62edafdeebceb2bdc1482496a (10214ms, 167-byte body)
Jan 10, 2018 6:08:06 AM com.ibm.watson.developer_cloud.service.WatsonService processServiceCall
SEVERE: POST https://gateway-a.watsonplatform.net/visual-recognition/api/v3/classify?version=2016-05-20&api_key=aca4433597018de62edafdeebceb2bdc1482496a, status: 400, error: {
    "images_processed": 0,
    "error": {
        "code": 400,
        "description": "Invalid form data 'parameters'",
        "error_id": "parameter_error"
    }
}
Exception in thread "AWT-EventQueue-0" com.ibm.watson.developer_cloud.service.exception.BadRequestException: {
    "images_processed": 0,
    "error": {
        "code": 400,
        "description": "Invalid form data 'parameters'",
        "error_id": "parameter_error"
    }
}
    at com.ibm.watson.developer_cloud.service.WatsonService.processServiceCall(WatsonService.java:408)
    at com.ibm.watson.developer_cloud.service.WatsonService$1.execute(WatsonService.java:174)
    at visualRecognitionSecondTry.ClassifyInterface$3.actionPerformed(ClassifyInterface.java:129)
    at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
    at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
    at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
    at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
    at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
    at java.awt.Component.processMouseEvent(Unknown Source)
    at javax.swing.JComponent.processMouseEvent(Unknown Source)
    at java.awt.Component.processEvent(Unknown Source)
    at java.awt.Container.processEvent(Unknown Source)
    at java.awt.Component.dispatchEventImpl(Unknown Source)
    at java.awt.Container.dispatchEventImpl(Unknown Source)
    at java.awt.Component.dispatchEvent(Unknown Source)
    at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
    at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
    at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
    at java.awt.Container.dispatchEventImpl(Unknown Source)
    at java.awt.Window.dispatchEventImpl(Unknown Source)
    at java.awt.Component.dispatchEvent(Unknown Source)
    at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
    at java.awt.EventQueue.access$500(Unknown Source)
    at java.awt.EventQueue$3.run(Unknown Source)
    at java.awt.EventQueue$3.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
    at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
    at java.awt.EventQueue$4.run(Unknown Source)
    at java.awt.EventQueue$4.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
    at java.awt.EventQueue.dispatchEvent(Unknown Source)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
    at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
    at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
    at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
    at java.awt.EventDispatchThread.run(Unknown Source)

Answer 1

此错误表示服务无法解析您的 JSON 参数对象。我怀疑您在从文本字段获取值时缺少引号或未将 classifier_ids 作为数组提交，但如果没有更多代码就无法判断如何执行此操作。