Struts2簡單數據校驗。
INPUT爲例：
重寫ActionSupport的validate方法
頁面錯誤提示：
<%@taglib prefix="s" uri="/struts-tags" %>
<s:fielderror name="use"></s:fielderror>
可以通過：
<s:fielderror fieldName="name" theme="simple"></s:fielderror>
<s:property value="errors.name"/>
<s:debug></s:debug>
訪問Web元素：
1.通過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("通過ActionContext來訪問request,session,application對象");
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.通過實現接口 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("通過實現RequestAware、SessionAware、ApplicationAware接口來訪問request,session,application對象");
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.通過實現接口 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("通過實現ServletRequestAware接口來訪問request,session,application對象");
return SUCCESS;
}
@Override
public void setServletRequest(HttpServletRequest Request) {
this.request = Request;
this.session = Request.getSession();
this.application = Request.getServletContext();
// TODO Auto-generated method stub
}<body>
<h1>通過ActionContext來訪問request,session,application對象</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:運用服務器跳轉 jsp forward
不可跳轉action,只可以跳轉視圖
redirect:
客戶端重定向
chain 跳轉action(訪問時不用添加“/”)
forward action
redirectAction
重定向action
全局結果集（Globle Result）
當用多個action使用同一個結果時
<global-results>
<result name="main">/common_warrn.jsp</result>
</global-results>動態結果集（${}）
private int d;
private String r;
public int getD() {
return d;
}
public void setD(int d) {
this.d = d;
}
public String getR() {
return r;
}
public void setR(String r) {
this.r = r;
}
@Override
public String execute() throws Exception {
if(d==1)
r="/dynamic_type_result.jsp";
else if(d==2)
r="/update.jsp";
return SUCCESS;
}帶參數結果集：
<s:property value="d"/><br/>
<s:property value="#parameters.d"/>
<s:debug></s:debug><action name="DynamicTypeResult" class="com.zxj.action.DynamicTypeResult">
<result type="redirect">/dynamic_type_result.jsp?r=${d}</result>
</action>