1.
public String add() {
if(name == null || !name.equals("admin")) {
this.addFieldError("name", "name is error");
this.addFieldError("name", "name is too long");
return ERROR;
}
return SUCCESS;
}
<s:fielderror fieldName="name" theme="simple"/>
<br />
<s:property value="errors.name[0]"/>
<br/>
<s:property value="errors.name[1]"/>
<s:debug></s:debug>
2.
public class LoginAction2 extends ActionSupport implements RequestAware,SessionAware, ApplicationAware {
private Map<String, Object> request;
private Map<String, Object> session;
private Map<String, Object> application;
//DI dependency injection
//IoC inverse of control
public String execute() {
request.put("r1", "r1");
session.put("s1", "s1");
application.put("a1", "a1");
return SUCCESS;
}
@Override
public void setRequest(Map<String, Object> request) {
this.request = request;
}
@Override
public void setSession(Map<String, Object> session) {
this.session = session;
}
@Override
public void setApplication(Map<String, Object> application) {
this.application = application;
}
}
<s:property value="#request.r1"/> | <%=request.getAttribute("r1") %>
<s:property value="#session.s1"/> | <%=session.getAttribute("s1") %>
<s:property value="#application.a1"/>|<%=application.getAttribute("a1")%>
3.
<struts>
<constant name="struts.devMode" value="true" />
<include file="login.xml" />
</struts>
4.
<default-action-ref name="index"></default-action-ref>
5.
<package name="user" namespace="/user" extends="struts-default">
<global-results>
<result name="mainpage">/main.jsp</result>
</global-results>
<action name="index">
<result>/index.jsp</result>
</action>
<action name="user" class="com.bjsxt.struts2.user.action.UserAction">
<result>/user_success.jsp</result>
<result name="error">/user_error.jsp</result>
</action>
</package>
<package name="admin" namespace="/admin" extends="user">
<action name="admin class="com.bjsxt.struts2.user.action.AdminAction">
<result>/admin.jsp</result>
</action>
</package>
6.
<action name="user" class="com.bjsxt.struts2.user.action.UserAction">
<result>${r}</result>
</action>
private String r;
public String getR() {
return r;
}
public void setR(String r) {
this.r = r;
}
public String execute() throws Exception {
if(type == 1) r="/user_success.jsp";
else if (type == 2) r="/user_error.jsp";
return "success";
}
7.
<action name="user" class="com.bjsxt.struts2.user.action.UserAction">
<result type="redirect">/user_success.jsp?t=${type}</result>
</action>
from valuestack: <s:property value="t"/><br/>
from actioncontext: <s:property value="#parameters.t"/>
