JSON字符串POJO，使用GSON，澄清需要

Question

我有一個JSON文件，爲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" + 
      " }"; 

我代表它的一個bean（正確的，如果不正確地）

public class Component { 

    String name; 
    String environment; 

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

    // standard getters and setters 
} 

我想通過以下方式將此字符串提供給此類：

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

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

上述操作不起作用。 （我得到null回來，好像組件的名字值從未設置）

我在想什麼？

Answer 1

事實上，你必須從Json中刪除封閉的類。

的確，JSON從封閉類的內容開始。

所以，你的JSON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" + 
       "  ]}" ; 

我想你應該閱讀更多關於json的信息，我已經刪除了json字符串中的某些內容，然後成功了。