使用GSON將JSON字符串轉換為POJO，需要澄清

Question

我有一個JSON文件，如String ：

    String compString = "{\n" +
            "      \"Component\": {\n" +
            "        \"name\": \"Application\",\n" +
            "        \"environment\": \"QA\",\n" +
            "        \"hosts\": [\n" +
            "          \"box1\",\n" +
            "          \"box2\"\n" +
            "        ],\n" +
            "        \"directories\": [\n" +
            "          \"/path/to/dir1/\",\n" +
            "          \"/path/to/dir2/\",\n" +
            "          \"/path/to/dir1/subdir/\",\n" +
            "        ]\n" +
            "      }\n" +
            "    }";

我有一個代表它的bean（如果不正確，則正確）

public class Component {

    String name;
    String environment;

    List<String> hosts = new ArrayList<String>();
    List<String> directories = new ArrayList<String>();

    // standard getters and setters
}

我試圖通過以下方式將此String饋給此類：

    Gson gson = new Gson();
    Component component = gson.fromJson(compString, Component.class);

    System.out.println(component.getName());

以上不起作用。 （我得到的返回null ，好像從未設置組件的名稱值一樣）

我想念什么？

Answer 1

實際上，您必須從Json中刪除封閉的類。

實際上，JSON是從封閉類的內容開始的。

因此，您的JSON將是：

 String compString = "{\n" +
                    "        \"name\": \"Application\",\n" +
                    "        \"environment\": \"QA\",\n" +
                    "        \"hosts\": [\n" +
                    "          \"box1\",\n" +
                    "          \"box2\"\n" +
                    "        ],\n" +
                    "        \"directories\": [\n" +
                    "          \"/path/to/dir1/\",\n" +
                    "          \"/path/to/dir2/\",\n" +
                    "          \"/path/to/dir1/subdir/\",\n" +
                    "        ]\n" +
                    "      }\n";

Answer 2

String compString = 
                "       {\n" +
                "        \"name\": \"Application\",\n" +
                "        \"environment\": \"QA\",\n" +
                "        \"hosts\": [\n" +
                "          \"box1\",\n" +
                "          \"box2\"\n" +
                "        ],\n" +
                "        \"directories\": [\n" +
                "          \"/path/to/dir1/\",\n" +
                "          \"/path/to/dir2/\",\n" +
                "          \"/path/to/dir1/subdir/\",\n" +
                "        ]}" ;

我認為您應該閱讀有關json的更多信息，我已經刪除了json字符串中的某些內容，然后成功了。