在 Java 中将 bean 转换为 Json
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/11692303/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Turning a bean to Json in java
提问by user1558274
I have a class that I want to turn into JSON, but the constructor does not allow me. The class is called CourseKeyInfo:
我有一个我想变成 JSON 的类，但构造函数不允许我这样做。该类称为 CourseKeyInfo：
public class CourseKeyInfo
{
private String courseKey;
private String institutionID;
public CourseKeyInfo(String courseKey, String institutionId)
{
this.courseKey = courseKey;
this.institutionID = institutionId;
}
public String getCourseKey()
{
return courseKey;
}
public void setCourseKey(String courseKey)
{
this.courseKey = courseKey;
}
public String getInstitutionID()
{
return institutionID;
}
public void setInstitutionID(String institutionID)
{
this.institutionID = institutionID;
}
}
I use JSONObject body = new JSONObject(responseEntity);to turn it into json but it give me "The constructor JSONObject(CourseKeyInfo) is undefined" error. Any idea how I can turn my class into json?
我曾经JSONObject body = new JSONObject(responseEntity);把它变成 json 但它给了我“构造函数 JSONObject(CourseKeyInfo) 未定义”错误。知道如何将我的课程变成 json 吗？
回答by Reimeus
The constructor JSONObject(Object)does actually exist.
构造函数JSONObject(Object)确实存在。
CourseKeyInfo courseKeyInfo = new CourseKeyInfo("This Works!", "101");
JSONObject jsonObject = new JSONObject(courseKeyInfo);
回答by sunil
If you use GSON, you can do this is one line as:
如果您使用GSON，则可以在一行中执行以下操作：
CourseKeyInfo courseKeyInfo = new CourseKeyInfo("This Works!", "101");
String json = new Gson().toJson(courseKeyInfo);
System.out.println(json);
for this to work
为了这个工作
- download GSON JAR
- Add to your project build path
- That's all
- 下载GSON JAR
- 添加到您的项目构建路径
- 就这样
and the result is:
结果是：
{"courseKey":"This Works!","institutionID":"101"}
回答by Andrey Borisov
for http request here is example of using json array+ json beans
对于 http 请求，这里是使用 json 数组 + json bean 的示例
JSONArray jsonArray = new JSONArray();
for (Credentials credentials : ((PropertiesManager) propertiesManager.get()).getJsonPropertiesManager().getAllCredentials()) {
JSONObject jsonObject = new JSONObject();
jsonObject.put("credentialsName", credentials.getName());
jsonArray.add(jsonObject);
}
req.setAttribute(JSON_RESULT_OBJ_ATTR, jsonArray.toString());
