Question

我试图使用GSON从JSON文件加载图像，并且在StackOverflow上读取多个线程后，我发现最好的解决方案是将URL存储到JSON文件中，然后将其加载到图像中。问题是，我的应用程序无法将这些URL加载到图像中，我也不知道为什么。例如，当我进入调试模式时：Debug Mode Image

它显示图像为空。

这是我的JSON文件：

std::optional

ReadJSON.java是用于读取JSON文件的类。

ReadJSON.java

{
    "shoes": [
        {
            "shoeName": "Shoe",
            "shoePrice": "120",
            "brand": "Shoe",
            "typeOfShoes": "Running",
            "style": "Cool",
            "colors": [
                "Blue",
                "Green",
                "Pink"
            ],
            "sizes": [
                "W5/M3.5",
                "W5.5/M4"
            ],
            "description": "The Shoe SE features sleek lines and a sheer upper that combine classic Air Max elements into a lightweight, comfortable and versatile icon. Together with its smart toe-down profile and extra lift, the shoe offers an ever-bigger expression..",
            "shipping": "0",
            "tax": "0",
            "subtotal": "0",
            "review": "4.5",
            "totalRaffles": "80",
            "imageURLs": ["https://www.nike.com/t/vaporfly-4-flyknit-running-shoe-v7G3FB"],
            "isSold": "false"
        },
        {
            "shoeName": "Empty Shoe",
            "shoePrice": "0",
            "brand": "null",
            "typeOfShoes": "null",
            "style": "null",
            "colors": ["null"
            ],
            "sizes": ["null"
            ],
            "description": "null",
            "shipping": "0",
            "tax": "0",
            "subtotal": "0",
            "review": "0",
            "totalRaffles": "0",
            "imageURLs": ["https://www.nike.com/t/vaporfly-4-flyknit-running-shoe-v7G3FB"],
            "isSold": "false"
        },
        {
            "shoeName": "Empty Shoe1",
            "shoePrice": "0",
            "brand": "null",
            "typeOfShoes": "null",
            "style": "null",
            "colors": ["null"
            ],
            "sizes": ["null"
            ],
            "description": "null",
            "shipping": "0",
            "tax": "0",
            "subtotal": "0",
            "review": "0",
            "totalRaffles": "0",
            "imageURLs": ["https://www.nike.com/t/vaporfly-4-flyknit-running-shoe-v7G3FB"],
            "isSold": "false"
        }
    ]

    }

这是用于定义鞋子对象的Shoe类：

Shoe.java

import java.io.File;
import java.io.IOException;
import java.lang.reflect.Type;
import java.nio.file.Files;
import java.util.List;

import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;
import com.pulsebeat02.main.gui.Shoe;
import com.pulsebeat02.main.gui.windows.StartingWindow;

public class ReadJSON {

    public static void main(String[] args) {
        // TODO Auto-generated method stub

        parseJSON();

    }

    public static void parseJSON() {

        String cwd = System.getProperty("user.dir");

        File f = new File(cwd + "/shoes.json");

        String str = null;
        try {
            str = readFile(f);
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        Gson gson = new Gson();

        Type dataType = (new TypeToken<Shoes>() {
        }).getType();

        Shoes shoeList = gson.fromJson(str, dataType);

        List<Shoe> shoes = shoeList.getShoes();

        Shoe [] shoesFinal = new Shoe[shoes.size()];

        for (int i = 0; i < shoesFinal.length; i++) {

            shoesFinal[i] = shoes.get(i);

        }

        StartingWindow.shoesInGui = shoesFinal;

        System.out.println(shoeList);
        System.out.println("Ran");

    }

    public static String readFile(File file) throws IOException {
        return new String(Files.readAllBytes(file.toPath()));
    }

}

Answer 1

样本中的URL不是图像URL，而是通用Web URL。这是具有正确和绝对图像URL（在浏览器上执行此URL）的工作代码示例：

Image image = null;
try {
    image = ImageIO.read(new URL("https://c.static-nike.com/a/images/t_PDP_864_v1/f_auto,b_rgb:f5f5f5/ds8ojj70wtpthbzadaft/air-max-dia-se-shoe-WCG8t5.jpg"));
    System.out.println("Image read");
}
catch (Exception e) {
}

为什么我的图像没有从JSON文件加载？

1 个答案: