Java servlets how to create a session and how to store a session ID
时间: 2023-07-02 08:06:44 浏览: 69
To create a session in a Java servlet, you can use the `HttpSession` interface. Here is an example code snippet:
```java
// Get the session object
HttpSession session = request.getSession(true);
// Set session attributes
session.setAttribute("username", "John");
session.setAttribute("userid", 123);
// Get session ID
String sessionId = session.getId();
```
In this example, we first retrieve the `HttpSession` object from the `HttpServletRequest` object using the `getSession()` method. The `true` parameter indicates that a new session should be created if one does not already exist.
We then set some session attributes using the `setAttribute()` method. These attributes can be retrieved later in the session by their keys.
Finally, we obtain the session ID using the `getId()` method.
To store the session ID, you can simply pass it as a parameter in URLs or hidden form fields. For example:
```html
<form action="someAction" method="post">
<input type="hidden" name="sessionId" value="<%=sessionId%>">
...
</form>
```
Or:
```html
<a href="somePage?sessionId=<%=sessionId%>">Click here</a>
```
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