blocks|key|503173|text|尝尝这个。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|503174|<%25@page+language="java"+session="true"+%25>|code-block|syntax|javascript|503175|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

<p>Try this.</p>

<pre><code>&lt;%@page language="java" session="true" %&gt;
</code></pre>


blocks|key|503307|text|通过Java+class，我假设您指的是Servlet类，因为在任意Java类中设置会话属性不会使sense.You在servlet的doGet/doPost方法中执行类似的操作|type|unstyled|depth|inlineStyleRanges|entityRanges|data|503308|public+void+doGet(HttpServletRequest+request,+HttpServletResponse+response)+{

++++HttpSession+session+=+request.getSession();
++++String+username+=+(String)request.getAttribute("un");
++++session.setAttribute("UserName",+username);
}|code-block|syntax|javascript|503309|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

<p>By Java class, I am assuming you mean a Servlet class as setting session attribute in arbitrary Java class does not make sense.You can do something like this in your servlet's doGet/doPost methods</p>

<pre><code>public void doGet(HttpServletRequest request, HttpServletResponse response) {

    HttpSession session = request.getSession();
    String username = (String)request.getAttribute("un");
    session.setAttribute("UserName", username);
}
</code></pre>


blocks|key|503351|text|Java文件:+Jclass.java|type|unstyled|depth|inlineStyleRanges|entityRanges|data|503352|package+Jclasspackage

public+class+Jclass+{

++++public+String+uname+;
++++/**
+++++*+@return+the+uname
+++++*/
++++public+String+getUname()+{
++++++++return+uname;
++++}

++++/**
+++++*+@param+uname+the+uname+to+set
+++++*/
++++public+void+setUname(String+uname)+{
++++++++this.uname+=+uname;
++++}

++++public+Jclass()+{
++++++++this.uname+=+null;
++++}

++++public+static+void+main(String[]+args)+{

++++}
}|code-block|syntax|javascript|503353|JSP文件:+sample.jsp|503354|++++<%25@+page+language="java"
++++import="java.util.*,java.io.*"
++++pageEncoding="ISO-8859-1"%25>

<jsp:directive.page+import="Jclasspackage.Jclass.java"+/>+++
<%25+Jclass+jc+=+new+Jclass();
String+username+=+(String)request.getAttribute("un")
jc.setUname(username);
%25>|503355|503356|这样，您就可以在类中使用"this.username“来访问java文件中的用户名|503357|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|Q|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|R|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|S|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|T|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|U|8|@]|9|@]|A|$]]|$1|N|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|O|$]]

<h2>Java file : Jclass.java</h2>

<pre><code>package Jclasspackage

public class Jclass {

    public String uname ;
    /**
     * @return the uname
     */
    public String getUname() {
        return uname;
    }

    /**
     * @param uname the uname to set
     */
    public void setUname(String uname) {
        this.uname = uname;
    }

    public Jclass() {
        this.uname = null;
    }

    public static void main(String[] args) {

    }
}
</code></pre>

<h2>JSP file: sample.jsp</h2>

<pre><code>    &lt;%@ page language="java"
    import="java.util.*,java.io.*"
    pageEncoding="ISO-8859-1"%&gt;

&lt;jsp:directive.page import="Jclasspackage.Jclass.java" /&gt;   
&lt;% Jclass jc = new Jclass();
String username = (String)request.getAttribute("un")
jc.setUname(username);
%&gt;
</code></pre>

<h2>-----------------</h2>

<p>In this way you can access the username in the java file using 
"this.username" in the class</p>


blocks|key|719467|text|默认情况下，会话对象在jsp页面上可用(隐式对象)。它在普通的POJO+java类中是不可用的。您可以使用HttpServletRequest获取Servelt上的HttpSession对象的引用|type|unstyled|depth|inlineStyleRanges|entityRanges|data|719468|HttpSession+s=request.getSession()
s.setAttribute("name","value");|code-block|syntax|javascript|719469|您可以在基于ActionSupport的Action+POJO类上获取会话，如下所示|719470|+ActionContext+ctx=+ActionContext.getContext();
+++Map+m=ctx.getSession();
+++m.put("name",+value);|719471|查看：http://ohmjavaclasses.blogspot.com/2011/12/access-session-in-action-class-struts2.html|offset|length|719472|entityMap|0|LINK|mutability|MUTABLE|url|http://ohmjavaclasses.blogspot.com/2011/12/access-session-in-action-class-struts2.html^0|0|0|0|0|3|2E|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Y|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|Z|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|10|8|@]|9|@$M|11|N|12|1|13]]|A|$]]|$1|O|3|-4|5|6|7|14|8|@]|9|@]|A|$]]]|P|$Q|$5|R|S|T|A|$U|V]]]]

<p>By default session object is available on jsp page(implicit object). It will not available in normal POJO java class.
You can get the reference of HttpSession object on Servelt by using HttpServletRequest </p>

<pre><code>HttpSession s=request.getSession()
s.setAttribute("name","value");
</code></pre>

<p>You can get session on an ActionSupport based Action POJO class as follows</p>

<pre><code> ActionContext ctx= ActionContext.getContext();
   Map m=ctx.getSession();
   m.put("name", value);
</code></pre>

<p>look at:
<a href="http://ohmjavaclasses.blogspot.com/2011/12/access-session-in-action-class-struts2.html" rel="nofollow">http://ohmjavaclasses.blogspot.com/2011/12/access-session-in-action-class-struts2.html</a></p>


blocks|key|719521|text|我正在试着理解你的意思，希望它能对你有所帮助。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|719522|if+(session.isNew()){
+++++title+=+"Welcome+to+my+website";
+++++session.setAttribute(userIDKey,+userID);|code-block|syntax|javascript|719523|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

<p>I am try to catch your point.I hope it is helpful.....</p>

<pre><code>if (session.isNew()){
     title = "Welcome to my website";
     session.setAttribute(userIDKey, userID);
</code></pre>


<p>I am able to set session attribute in scriptlet  but when I am trying to set session attribute inside java class it shows error like "session cannot be resolved".
So how to set session in java?</p>

<pre><code>&lt;%String username = (String)request.getAttribute("un");
session.setAttribute("UserName", username);%&gt;
</code></pre>


How to set session attribute in java?

Java

我可以在scriptlet中设置会话属性，但当我试图在java类中设置会话属性时，它显示错误，如“会话无法被解析”。那么如何在java中设置会话呢？<%String username = (String)request.getAttribute("un");session.setAttribute("UserName"...

问如何在java中设置会话属性？
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