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Struts2学习笔记（访问Web元素和Result_Type）

2016-03-16 17:12 435 查看

Struts2简单数据校验。

INPUT为例：

重写ActionSupport的validate方法

页面错误提示：

<%@taglib prefix="s" uri="/struts-tags" %>

<s:fielderror name="use"></s:fielderror>

可以通过：

<s:fielderror fieldName="name" theme="simple"></s:fielderror>

<s:property value="errors.name"/>

<s:debug></s:debug>

访问Web元素：

1.通过ActionContext

private Map <String,Object>request;

private Map <String,Object>session;

private Map <String,Object>application;

@SuppressWarnings("unchecked")
@Override
public String execute() throws Exception {
System.out.println("通过ActionContext来访问request,session,application对象");
request = (Map<String, Object>) ActionContext.getContext().get("request");
session = ActionContext.getContext().getSession();
application = ActionContext.getContext().getApplication();

request.put("R1", "request");
session.put("S1", "session");
application.put("Q1", "application");
return SUCCESS;

}

2.通过实现接口 RequestAware,SessionAware,ApplicationAware

private Map <String,Object>request;

private Map <String,Object>session;

private Map <String,Object>application;

@Override
public String execute() throws Exception {
request.put("R1", "request");
session.put("S1", "session");
application.put("Q1", "application");
System.out.println("通过实现RequestAware、SessionAware、ApplicationAware接口来访问request,session,application对象");
return SUCCESS;
}

@Override
public void setApplication(Map<String, Object> application) {
this.application=application;
}

@Override
public void setSession(Map<String, Object> session) {
this.session=session;
}

@Override
public void setRequest(Map<String, Object> request) {
this.request=request;
}

3.通过实现接口 ServletRequestAware

private HttpServletRequest request;

private HttpSession session;

private ServletContext application;
@Override
public String execute() throws Exception {
request.setAttribute("R1", "request");
session.setAttribute("S1", "session");
application.setAttribute("Q1", "application");
System.out.println("通过实现ServletRequestAware接口来访问request,session,application对象");
return SUCCESS;
}
@Override
public void setServletRequest(HttpServletRequest Request) {
this.request = Request;
this.session = Request.getSession();
this.application = Request.getServletContext();
// TODO Auto-generated method stub

}

共用jsp

<body>
<h1>通过ActionContext来访问request,session,application对象</h1>
<s:property  value="#request.R1"/>|<%=request.getAttribute("R1") %>
<s:property  value="#session.S1"/>|<%=session.getAttribute("S1") %>
<s:property  value="#application.Q1"/>|<%=application.getAttribute("Q1") %>
<br/>
<s:property value="#attr.Q1"/><br/>
<s:property value="#attr.R1"/><br/>
<s:property value="#attr.S1"/><br/>

Struts2 Result----Type

dispacher:运用服务器跳转 jsp forward

不可跳转action,只可以跳转视图

redirect:

客户端重定向

chain 跳转action(访问时不用添加“/”)

forward action

redirectAction

重定向action

全局结果集（Globle Result）

当用多个action使用同一个结果时

<global-results>
<result name="main">/common_warrn.jsp</result>
</global-results>

动态结果集（${}）

private int d;
private String r;

public int getD() {
return d;
}

public void setD(int d) {
this.d = d;
}

public String getR() {
return r;
}

public void setR(String r) {
this.r = r;
}

@Override
public String execute() throws Exception {
if(d==1)
r="/dynamic_type_result.jsp";
else if(d==2)
r="/update.jsp";
return SUCCESS;
}

带参数结果集：

<s:property value="d"/><br/>
<s:property value="#parameters.d"/>
<s:debug></s:debug>

<action name="DynamicTypeResult" class="com.zxj.action.DynamicTypeResult">
<result type="redirect">/dynamic_type_result.jsp?r=${d}</result>
</action>

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标签： struts struts2.0

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