Struts2获取request三种方法

http://blog.sina.com.cn/s/blog_61feef0c0100qdzu.html

Struts2获取request三种方法

struts2里面有三种方法可以获取request,最好使用ServletRequestAware接口通过IOC机制注入Request对象。

在Action中获取request方法一：

<wbr></wbr>

在Action中的代码：

Map request = (Map)ActionContext.getContext().get("request");

List<Task> tasks = taskManager.findAll();

request.put("tasks", tasks);

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在JSP页面中获取其中的值：

<s:iterator id="task" value="#request.tasks">

<wbr><wbr><span></span><wbr><span></span><wbr><span></span>&lt;tr class="table_header"&gt;</wbr></wbr></wbr></wbr>

<wbr><wbr><span></span><wbr><span></span><wbr><span></span><wbr>&lt;td&gt;&lt;s:property value="#task.tname"/&gt;&lt;/td&gt;</wbr></wbr></wbr></wbr></wbr>

<wbr><wbr><span></span><wbr><span></span><wbr><span></span><wbr>&lt;td&gt;&lt;s:property value="#task.tuid"/&gt;&lt;/td&gt;</wbr></wbr></wbr></wbr></wbr>

<wbr><wbr><span></span><wbr><span></span><wbr><span></span><wbr>&lt;td&gt;&lt;s:property value="#task.tstartTime"/&gt;&lt;/td&gt;</wbr></wbr></wbr></wbr></wbr>

<wbr><wbr><span></span><wbr><span></span><wbr><span></span><wbr>&lt;td&gt;&lt;s:property value="#task.tendTime"/&gt;&lt;/td&gt;</wbr></wbr></wbr></wbr></wbr>

<wbr><wbr><span></span><wbr><span></span><wbr><span></span><wbr>&lt;td&gt;&lt;s:property value="#task.tstate"/&gt;&lt;/td&gt;</wbr></wbr></wbr></wbr></wbr>

<wbr><wbr><span></span><wbr><span></span><wbr><span></span><wbr>&lt;td&gt;&lt;input type="radio" id="choose" name="choose" onclick="getId(this.value)" value="&lt;s:property value='#task.tid'/&gt;"/&gt;&lt;/td&gt;<wbr></wbr></wbr></wbr></wbr></wbr></wbr>

<wbr><wbr><span></span><wbr><span></span><wbr><span></span>&lt;/tr&gt;</wbr></wbr></wbr></wbr>

</s:iterator>

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方法二：通过ServletActionContext类来获取，使用struts2经验如果处理get传参是中文，只能使用该方法进行处理乱码问题

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Action中代码：

HttpServletRequest request = ServletActionContext.getRequest();

request.setAttribute("username", "zhangsan");

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在jsp中获取其中的值

<wbr><wbr><span></span><wbr><span></span>&lt;s:property value="#request.username"&gt;或者${requestScope.req}</wbr></wbr></wbr>

--------------------------------------------------------------------------------------------<wbr></wbr>

方法三：通过ServletRequestAware接口通过IOC机制注入Request对象

Action中的代码：

Action实现ServletRequestAware接口，实现接口中的方法

<wbr><wbr><span></span><wbr><span></span>private HttpServletRequest request;</wbr></wbr></wbr>

<wbr><wbr><span></span><wbr><span></span>//实现接口中的方法</wbr></wbr></wbr>

<wbr><wbr><span></span><wbr><span></span>public void setServletRequest(HttpServletRequest request){</wbr></wbr></wbr>

<wbr><wbr><span></span><wbr><span></span><wbr>this.request = request;</wbr></wbr></wbr></wbr>

<wbr><wbr><span></span><wbr><span></span>}</wbr></wbr></wbr>

<wbr><wbr><span></span><wbr><span></span>//然后在execute()方法中就可以使用了</wbr></wbr></wbr>

<wbr><wbr><span></span><wbr><span></span>public String execute(){</wbr></wbr></wbr>

<wbr><wbr><span></span><wbr><span></span><wbr>request.setAttribute("username", "zhangsan");</wbr></wbr></wbr></wbr>

<wbr><wbr><span></span><wbr><span></span><wbr>request.getSession().getServletContext().getApplication(); //得到Application</wbr></wbr></wbr></wbr>

<wbr><wbr><span></span><wbr><span></span>}</wbr></wbr></wbr>

<wbr><wbr><span></span><wbr><span></span>该方法必须要实现，而且该方法是自动被调用</wbr></wbr></wbr>

<wbr><wbr><span></span><wbr><span></span>这个方法在被调用的过程中，会将创建好的request对象通过参数的方式传递给你，你可以用来赋给你本类中的变量，然后request就可以使用了</wbr></wbr></wbr>

<wbr><wbr><span></span><wbr><span></span>注意：setServletRequest()方法一定会再execute()方法被调用前执行</wbr></wbr></wbr>

<wbr></wbr>

在jsp页面中获取其中的值

<s:property value="#request.task.tname"/>