struts2 從一個action 跳轉到另一個action的兩種方法

從action1直接跳轉到action2,有兩種方法：

1. 需要保存前一個action的屬性信息時使用，保存住action1的request對象:
     <result type= "chain " name="a2">action2</result>
2. 不保存前一個action的參數可以用這種方法:
      <result  type= "redirectAction "> action2</result>

Struts.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN""http://struts.apache.org/dtds/struts-2.1.dtd">
<struts>

<!--一個action跳轉到另一個action 跳轉方式爲chain 會保留request對象 redirectAction 則不能保留-->
<package name="limin"extends="struts-default">
<action name="sa1_*" class="com.Action.StrAction1" method="{1}">
<!--<result type="chain" name="sa2">sa2_sa2</result>  -->
<result type="redirectAction" name="sa2">sa2_sa2</result>
</action>

<action name="sa2_*" class="com.Action.StrAction2" method="{1}">
<result>/index.jsp</result>
</action>
</package>

</struts>

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd">
<struts>

<!--一個action跳轉到另一個action 跳轉方式爲chain 會保留request對象 redirectAction 則不能保留-->
<package name="limin" extends="struts-default">
<action name="sa1_*" class="com.Action.StrAction1" method="{1}">
<!--<result type="chain" name="sa2">sa2_sa2</result>  -->
<result type="redirectAction" name="sa2">sa2_sa2</result>
</action>

<action name="sa2_*" class="com.Action.StrAction2" method="{1}">
<result>/index.jsp</result>
</action>
</package>

</struts>

action1

public class StrAction1 {
    String a ="liminhappygirl";
    public String getA() {
        return a;
    }
    public void setA(String a) {
        this.a = a;
    }
    public String sa1() {
        HttpServletRequest request = (HttpServletRequest) ActionContext.getContext().get(ServletActionContext.HTTP_REQUEST);
        request.setAttribute("limin","happygirl");
        System.out.println("sal已經執行");
        return "sa2";
    }

}

public class StrAction1 {
    String a ="liminhappygirl";
    public String getA() {
        return a;
    }
    public void setA(String a) {
        this.a = a;
    }
    public String sa1() {
        HttpServletRequest request = (HttpServletRequest) ActionContext.getContext().get(ServletActionContext.HTTP_REQUEST);
        request.setAttribute("limin", "happygirl");
        System.out.println("sal已經執行");
        return "sa2";
    }

}

action2

public class StrAction2 {
    public String sa2() {
        HttpServletRequest request = (HttpServletRequest) ActionContext.getContext().get(ServletActionContext.HTTP_REQUEST);
        //當type="chain" 時能保存住request對象
        System.out.println(request.getAttribute("limin"));
        return Action.SUCCESS;
    }
}

public class StrAction2 {
    public String sa2() {
        HttpServletRequest request = (HttpServletRequest) ActionContext.getContext().get(ServletActionContext.HTTP_REQUEST);
        //當type="chain" 時能保存住request對象
        System.out.println(request.getAttribute("limin"));
        return Action.SUCCESS;
    }
}