用ObjectMapper读取嵌套的json文件

Question

我试图在ObjectMapper的帮助下读取一个json文件（schools.json）。json的文件结构如下所示：

[
  {
    "schoolid": "X",
    "schoolname": "ABC",
    "schoolbranch": "DEF",
  },
 {
    "schoolid": "Y",
    "schoolname": "GDF",
    "schoolbranch": "HJG",
  },
]

这个json文件是从java读取的，如下所示：

static final String fileName = "schools.json";

     InputStream iStream = getClass().getClassLoader().getResourceAsStream(fileName);
          schools = objectMapper.readValue(iStream,
                  objectMapper.getTypeFactory().constructCollectionType(List.class, School.class));

 [
      {
        "schoolid": "X",
        "schoolname": [{"original": "dfs"},{"translated":  "sfds"}],
        "schoolbranch":  [{"sub": "fdsf5"},{"major": "908fds"}],
      },
     {
        "schoolid": "Y",
        "schoolname": [{"original": "wera"},{"translated":  "sfds"}],
        "schoolbranch":  [{"sub": "mohk"},{"major": "908fds"}],
      },
 ]

public class School {
private int schoolid;
private SchoolName schoolname;
private SchoolBranch schoolbranch;
... 
// getters and setters here
}

public class SchoolName {
private String original;
private String translated;
// etc.
}

现在，上面的java代码块不工作了。schools对象返回NULL。

我不能让这个工作。我发现了一些json字段包含数组的例子，但我不能将类似的逻辑应用到我的例子中。感谢你的帮助。

Answer 1

正如Smutje和Smile所说，您的json对象是列表，而不是单个对象。将java School对象更改为：

public class School {
private int schoolid;
private List<SchoolName> schoolname;
private List<SchoolBranch> schoolbranch;
... 
// getters and setters here
}