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，使用 IBM Watson 服务制作自定义分类器，一切正常，但我在使用来自文本文件的分类器 ID 对图像进行分类时遇到问题。

当我将自定义分类器 ID 放入代码中时，它工作正常，但是当我尝试从 TextField 中获取该 ID 时，它不起作用。

这是按钮动作事件中的代码。变量 String id 准确输出 parameters 方法中的内容，但它将 id (cats_599303326) 替换为 TextField 中的 id 但是当我将 id 作为parameters 方法中的参数，程序将不会运行成功。

另一方面，如果我注释所有内容并只输出 id 字符串，将其复制并粘贴到 parameters 方法中，它工作正常。

为什么我把变量id传过去就不行了？

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 方法时的错误日志，正如我之前所说，如果我只打印 id 字符串，请复制并粘贴它作为 parameters 方法程序中的参数将运行成功，但如果我将其作为变量，它不会运行:

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.execute(WatsonService.java:174)
    at visualRecognitionSecondTry.ClassifyInterface.actionPerformed(ClassifyInterface.java:129)
    at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
    at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
    at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
    at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
    at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
    at java.awt.Component.processMouseEvent(Unknown Source)
    at javax.swing.JComponent.processMouseEvent(Unknown Source)
    at java.awt.Component.processEvent(Unknown Source)
    at java.awt.Container.processEvent(Unknown Source)
    at java.awt.Component.dispatchEventImpl(Unknown Source)
    at java.awt.Container.dispatchEventImpl(Unknown Source)
    at java.awt.Component.dispatchEvent(Unknown Source)
    at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
    at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
    at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
    at java.awt.Container.dispatchEventImpl(Unknown Source)
    at java.awt.Window.dispatchEventImpl(Unknown Source)
    at java.awt.Component.dispatchEvent(Unknown Source)
    at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
    at java.awt.EventQueue.access0(Unknown Source)
    at java.awt.EventQueue.run(Unknown Source)
    at java.awt.EventQueue.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
    at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
    at java.awt.EventQueue.run(Unknown Source)
    at java.awt.EventQueue.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$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中获取值时缺少引号或没有将 classifier_ids 作为数组提交，但是如果没有更多代码就无法判断您是如何做到这一点的。

Answer 2

如果 Whosebug 的人终生禁止我，然后到我家杀我，我完全理解！！解决方案是如此简单，令人尴尬，我没有想到。基本上我创建的字符串有额外的引号。解决方案是：

String id = String.format("{\"classifier_ids\": [\"%s\"]}", textField_1.getText());

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

IBM Watson Visual Recognition parameters method won't accept String implicitly

java

eclipse

api

ibm-watson

visual-recognition