Java 解析字符串数组并拾取特定节点值

这是字符串，我必须使用最小行从中提取“消息”

已尝试GSON，对象映射器

{
  "errors": [
    {
      "timestamp": "2019-10-17T10:45:26.276+0000",
      "message": "This is an error",
      "debugMessage": "not working"
    }
  ]
}

这是我迄今为止尝试过的代码

JsonParser parser = new JsonParser(); 
JsonElement element = parser.parse(response); 
JsonObject jsonObj = element.getAsJsonObject(); 
String errCode = jsonObj.get("errors").getAsString(); 

---

在上面的

JSON

示例中

errors

是一个

JsonArray

JsonArray errCode = jsonObj.get("errors").getAsJsonArray();

即：

"errors": [
  {
  "timestamp": "2019-10-17T10:45:26.276+0000",
  "message": "This is an error",
  "debugMessage": "not working"
  }
]

{
  "timestamp": "2019-10-17T10:45:26.276+0000",
  "message": "This is an error",
  "debugMessage": "not working"
}

"message": "This is an error"

然后从

JsonArray

获取第一个

JsonObject

，它位于索引

0

JsonObject innerObj = errCode.get(0).getAsJsonObject();

即：

"errors": [
  {
  "timestamp": "2019-10-17T10:45:26.276+0000",
  "message": "This is an error",
  "debugMessage": "not working"
  }
]

{
  "timestamp": "2019-10-17T10:45:26.276+0000",
  "message": "This is an error",
  "debugMessage": "not working"
}

"message": "This is an error"

现在从

JsonObject

String msg = innerObj.get("message").getAsString();

即：

"errors": [
  {
  "timestamp": "2019-10-17T10:45:26.276+0000",
  "message": "This is an error",
  "debugMessage": "not working"
  }
]

{
  "timestamp": "2019-10-17T10:45:26.276+0000",
  "message": "This is an error",
  "debugMessage": "not working"
}

"message": "This is an error"

---

在上面的

JSON

示例中

errors

是一个

JsonArray

JsonArray errCode = jsonObj.get("errors").getAsJsonArray();

即：

"errors": [
  {
  "timestamp": "2019-10-17T10:45:26.276+0000",
  "message": "This is an error",
  "debugMessage": "not working"
  }
]

{
  "timestamp": "2019-10-17T10:45:26.276+0000",
  "message": "This is an error",
  "debugMessage": "not working"
}

"message": "This is an error"

然后从

JsonArray

获取第一个

JsonObject

，它位于索引

0

JsonObject innerObj = errCode.get(0).getAsJsonObject();

即：

"errors": [
  {
  "timestamp": "2019-10-17T10:45:26.276+0000",
  "message": "This is an error",
  "debugMessage": "not working"
  }
]

{
  "timestamp": "2019-10-17T10:45:26.276+0000",
  "message": "This is an error",
  "debugMessage": "not working"
}

"message": "This is an error"

现在从

JsonObject

String msg = innerObj.get("message").getAsString();

即：

"errors": [
  {
  "timestamp": "2019-10-17T10:45:26.276+0000",
  "message": "This is an error",
  "debugMessage": "not working"
  }
]

{
  "timestamp": "2019-10-17T10:45:26.276+0000",
  "message": "This is an error",
  "debugMessage": "not working"
}

"message": "This is an error"

---

显示您尝试的代码djsonparser parser=new JsonParser（）；JsonElement元素=parser.parse（响应）；JsonObject jsonObj=element.getAsJsonObject（）；字符串errCode=jsonObj.get（“errors”）.getAsString（）；显示您尝试的代码djsonparser parser=new JsonParser（）；JsonElement元素=parser.parse（响应）；JsonObject jsonObj=element.getAsJsonObject（）；字符串errCode=jsonObj.get（“errors”）.getAsString（）；使用小的技术：JsonElement msg=innerObj.get（“消息”）；使用小的技术：JsonElement msg=innerObj.get（“消息”）；