我正在尝试将jenkins API中的json文档映射到我自己的java对象。 json文档如下所示:
{
"assignedLabels": [
{}
],
"mode": "EXCLUSIVE",
"nodeDescription": "Jenkins Master-Knoten",
"nodeName": "",
"numExecutors": 2,
"description": null,
"jobs": [
{
"name": "Job 1",
"url": "https://build.example.com/jenkins/job/Job1/",
"color": "disabled"
},
{
"name": "Job 2",
"url": "https://build.example.com/jenkins/job/Job2/",
"color": "blue"
}
],
"overallLoad": {},
"primaryView": {
"name": "Alle",
"url": "https://build.example.com/jenkins/"
},
"quietingDown": false,
"slaveAgentPort": 0,
"unlabeledLoad": {},
"useCrumbs": false,
"useSecurity": true,
"views": [
{
"name": "Selection",
"url": "https://build.example.com/jenkins/view/-All%Selection/"
},
{
"name": "All",
"url": "https://build.example.com/jenkins/"
}
]
}
我的java模型如下所示:
public class JenkinsServer {
private List<String> assignedLabels;
private String url;
private String mode;
private String nodeName;
private String nodeDescription;
private String description;
private boolean useSecurity;
private boolean quietingDown;
private JenkinsServerView primaryView;
private List<JenkinsServerView> views;
private List<JenkinsJob> jobs;
// getters & setters
}
我现在正在做的是打电话
Gson gson = new Gson();
JenkinsServer server = gson.fromJson( reader, JenkinsServer.class );
但是我收到了这个例外
Caused by: java.lang.IllegalStateException: Expected BEGIN_OBJECT but was STRING at line 6 column 5
at com.google.gson.stream.JsonReader.beginObject(JsonReader.java:374)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:165)
我一直在网上寻找解决方案,但无法弄清楚我做错了什么。也许你们知道: - )
答案 0 :(得分:1)
正如@Gimby在评论中提到的,问题出在你的json数据中。
<强>解决方法1:强>
由于assignedLabels
是一个具有空值的字符串数组,因此一个选项是更改没有花括号的json数据,如下所示:
"assignedLabels": []
<强>溶液2:强>
将transient
关键字添加到java类
private transient List<String> assignedLabels;
<强> Solution3:强>
最后一个笨拙的方法是将@Expose
注释添加到要在java类中解析的所有变量
public class JenkinsServer {
private List<String> assignedLabels;
@Expose
private String url;
@Expose
private String mode;
@Expose
private String nodeName;
@Expose
private String nodeDescription;
@Expose
private String description;
@Expose
private boolean useSecurity;
@Expose
private boolean quietingDown;
@Expose
private JenkinsServerView primaryView;
@Expose
private List<JenkinsServerView> views;
@Expose
private List<JenkinsJob> jobs;
// getters & setters methods
}
然后添加解析逻辑以将json字符串解析为相应的java对象,如下所示:
Gson gson = new GsonBuilder().excludeFieldsWithoutExposeAnnotation().create();
JenkinsServer server = gson.fromJson(reader, JenkinsServer.class);