java 如何在JAVA的action类中创建一个JSON对象
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how to create a JSON object in action class of JAVA
提问by Jugal
I want to create a JSON object. I have tried the following
我想创建一个 JSON 对象。我已经尝试了以下
myString=new JSONObject().put("JSON", sampleClass).toString();
but mystring gives me {"SampleClass@170f98"}.
但 mystring 给了我 {"SampleClass@170f98"}。
I also tried the following
我也尝试了以下
XStream xsStream=new XStream(new JsonHierarchicalStreamDriver());
SampleClass sampleClass=new SampleClass(userset.getId(),userset.getUsername());
myString=xsStream.toXML(sampleClass);
It works but when i use getJSON in javascript to get myString it does not work.
它有效，但是当我在 javascript 中使用 getJSON 来获取 myString 时它不起作用。
回答by Mauli
try
尝试
String myString = new JSONObject().put("JSON", new JSONObject(sampleClass)).toString();
in my instance it looks like this:
在我的例子中它看起来像这样：
import org.json.JSONObject;
import org.junit.Test;
public class JsonTest
{
public static class SampleClass
{
private String id;
private String userName;
public SampleClass ( String id, String name )
{
this.id = id;
this.userName = name;
}
public String getUserName ()
{
return userName;
}
public void setUserName ( String userName )
{
this.userName = userName;
}
public String getId ()
{
return id;
}
public void setId ( String id )
{
this.id = id;
}
}
@Test
public void testSampleClass () throws Exception
{
SampleClass sampleClass = new SampleClass ( "myId", "MyName" );
System.out.println ( new JSONObject ( sampleClass ).toString () );
}
}
the result looks like this:
结果如下所示：
{"userName":"MyName","id":"myId"}
回答by JohnK
Look into GSON, a Java Library for converting Objects to JSON by Google. [GSON Library][1]
查看 GSON，这是一个由 Google 将对象转换为 JSON 的 Java 库。[GSON 库][1]
From the Google Code site:
从谷歌代码站点：
- Provide simple toJson() and fromJson() methods to convert Java objects to JSON and vice-versa
- Allow pre-existing unmodifiable objects to be converted to and from JSON
- 提供简单的 toJson() 和 fromJson() 方法将 Java 对象转换为 JSON，反之亦然
- 允许预先存在的不可修改对象与 JSON 相互转换
回答by Kees de Kooter
You should try:
你应该试试：
XStream xsStream=new XStream(new JettisonMappedXmlDriver());
