我将以下json写入要通过Gson读取的文件中：

{
  "identifier": "CONFIG",
  "data": [
    {
      "identifier": "HOTKEY",
      "data": {
        "hotKey": "testKey1",
        "type": "APPLICATION",
        "runnableContext": "testContext1"
      }
    },
    {
      "identifier": "HOTKEY",
      "data": {
        "hotKey": "testKey2",
        "type": "APPLICATION",
        "runnableContext": "testContext2"
      }
    }
  ]
}

在上面的Json中,您可以看到Identifier&递归地重复数据构造.因此,表示这种重复模式的基本类是通用类,如下所示：

{
  "identifier": "CONFIG",
  "data": {

  }
}

该模式由JsonData类表示,如下所示：

import java.util.Set;

....
import com.google.common.collect.ImmutableSet;

/**
 * Class representing a simple {@link JsonData#identifier}, 
 * {@link JsonData#data}  format. This class can be used to 
 * persist application data for example in a Configuration file.
 * 
 * @author SW029693
 * @since v1.0
 */
public class JsonData <T>{
    /**
     * Represents a unique identifier 
     */
    private String identifier;
    /**
     * Represents the data pertaining to this {@link JsonData#identifier} 
     */
    private T data;

    private static final Set<String> VALID_JSON_ID_TYPES = ImmutableSet.of("CONFIG","HOTKEYS","HOTKEY","RECOMMENDATIONS");

    public JsonData(String identifier, T data) {
        super();
        this.identifier = identifier;
        this.data = data;
    }

    /**
     * Getter for {@link JsonData#identifier} 
     * @return
     */
    public String getIdentifier() {
        return identifier;
    }

    /**
     * Sets the {@link JsonData#identifier} to the given value
     * @param  identifier
     *         Represents a unique {@link JsonData#identifier}  
     * @throws VerifyException
     *         If the argument is {@code null} or {@code empty}
     */
    public void setIdentifier(String identifier) throws VerifyException{
        Verifier.verifyNotNull(identifier, "identifier : null");
        Verifier.verifyNotEmpty(identifier,"identifier : empty");
        this.identifier = identifier;
    }

    /**
     * Getter for {@link JsonData} 
     * @return
     */
    public T getData() {
        return data;
    }

    /**
     * Sets the {@link JsonData#data} to the given value
     * @param  identifier
     *         Represents a unique {@link JsonData#data}  
     * @throws VerifyException
     *         If the argument is {@code null} 
     */
    public void setData(T data) {
        Verifier.verifyNotNull(data, "data : null");
        this.data = data;
    }

    @Override
    public String toString() {
        return "JsonData [identifier=" + identifier + ", data=" + data + "]";
    }
}

另外,在上面的Json中,您可以看到每个热键中的数据.通过gson读取json后,此数据将保存在ConfigurationProperty类中：

public class ConfigurationProperty implements Comparable<ConfigurationProperty>, Serializable{
....    
private final String hotKey;
private final String type;
private final String runnableContext;
....

现在的问题.我正在尝试读取文件并解析Json以便使用GSON将其存储到各个对象中而没有运气.

我有一些工作代码可以读取写入文件的单个JsonData对象：

    {
      "identifier": "HOTKEY",
      "data": {
        "hotKey": "testKey1",
        "type": "APPLICATION",
        "runnableContext": "testContext1"
      }
    }

成功读取：

private static JsonData<ConfigurationProperty> readconfigFile() {
    Reader reader = null;
    JsonData<ConfigurationProperty> data = null;
    Gson gson  = null;
    Type confType;
    try {
        reader = new FileReader("./config.json");
        gson = new GsonBuilder().create();
        confType = new TypeToken<JsonData<ConfigurationProperty>>() {}.getType();

        data = gson.fromJson(reader,confType);
    } catch (FileNotFoundException e) {
        e.printStackTrace();
        fail("Test failed while reading the config.json file: "+e.getMessage());        }
    finally {
        try {
            reader.close();
        } catch (IOException e) {
            e.printStackTrace();
            fail("Test failed while reading the config.json file: "+e.getMessage());
        }
    }
    return data;
}

但是,如果您看第一个json,那么这现在是JsonData的递归结构.同样在解析时,我需要告诉Gson,第一个数据对象是JsonData对象的数组.而且我还需要告诉gson,该数组中的每个JSONData对象的类型均为ConfigurationProperty.

我不确定该怎么做.

解决方法:

我想到了.这就是我做的

    private static JsonData<List<ConfigurationProperty>> readconfigFileList() {
    Reader reader = null;
    JsonData<List<ConfigurationProperty>> dataArray = null;
    Gson gson  = null;
    Type confType;
    Type confTypeArray;
    try {
        reader = new FileReader("./config.json");
        gson = new GsonBuilder().create();
        confType = new TypeToken<JsonData<List<ConfigurationProperty>>>() {}.getType();

        dataArray = gson.fromJson(reader,confType);
        System.out.println(dataArray.toString());

    } catch (FileNotFoundException e) {
        e.printStackTrace();
        fail("Test failed while reading the config.json file: "+e.getMessage());        }
    finally {
        try {
            reader.close();
        } catch (IOException e) {
            e.printStackTrace();
            fail("Test failed while reading the config.json file: "+e.getMessage());
        }
    }
    return dataArray;
}