Question

我有一个使用spring web flow的Java Web应用程序。

如何将值从一个流传递到另一个流？

<?xml version="1.0" encoding="UTF-8"?>
<flow xmlns="http://www.springframework.org/schema/webflow"
    xmlns:c="http://java.sun.com/jsp/jstl/core" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.springframework.org/schema/webflow
                          http://www.springframework.org/schema/webflow/spring-webflow-2.0.xsd">

    <persistence-context />

    <var name="editBean" class="jp.co.anicom.domain.User" />
    <var name="deleteBean" class="jp.co.anicom.domain.User" />
    <var name="authorityBean" class="jp.co.anicom.domain.Authority" />


    <on-start>
        <set name="flowScope.username" value="requestParameters.username" />
    </on-start>

    <action-state id="queryAll">
        <evaluate expression="employeeAction.GetAuthority(flowScope.username)"
            result="authorityBean" />
        <transition to="editForm" />
    </action-state>

    <view-state id="editForm" model="editBean" view="../xhtml/framework/edit">
        <transition on="editButton" to="validateAccount" />
        <transition on="delete" to="getId" />
        <transition on="back" to="editSuccessful" />
    </view-state>

    <action-state id="validateAccount">
        <evaluate expression="employeeAction.GetEmployee(flowScope.username, oldPassword)"
            result="editBean" />
        <transition to="checkUserAccount" />
    </action-state>

    <action-state id="getId">
        <evaluate expression="employeeAction.GetEmployee(flowScope.username)"
            result="deleteBean" />
        <transition to="deleteUser" />
    </action-state>

    <decision-state id="checkUserAccount">
        <if test="editBean == null" then="queryAll"
            else="confirmPassword" />
    </decision-state>

    <decision-state id="confirmPassword">
        <if test="newPassword.equals(confirmPassword)" then="editUser1"
            else="queryAll" />
    </decision-state>

    <action-state id="editUser1">
        <set name="editBean.password" value="newPassword" />
        <transition to="editUser2" />
    </action-state>

    <action-state id="editUser2">
        <evaluate
            expression="employeeAction.editEmployee(editBean, authorityBean.authority)" />
        <transition to="editSuccessful" />
    </action-state>

    <action-state id="deleteUser">
        <evaluate expression="employeeAction.deleteEmployee(deleteBean)" />
        <transition to="editSuccessful" />
    </action-state>

    <end-state id="editSuccessful"
        view="externalRedirect:contextRelative:/admin_main.do" commit="true" />
    <end-state id="displayError" view="../xhtml/framework/displayError" />
    <end-state id="dummy1" view="../xhtml/framework/dummy" />

    <global-transitions>
        <transition on-exception="java.lang.Exception" to="displayError" />
    </global-transitions>

</flow>

我在这里遇到编辑功能问题。在我的编辑页面中，我有用户名，oldpassword，newpassword和确认密码字段。

首先在validateAccount状态中检查数据库中是否存在用户名和oldpassword，如果它不存在，我将其转发到queryall状态。

如果存在，我检查新密码和确认密码值是否相同，如果它们相同，我继续编辑。

如果没有，我会再次回到queryAll。

QueryAll状态获得用户在重新显示页面时在表单中填充它的权限。当我将密码字段留空时，第一次单击编辑按钮它会抛出java.lang.NullPointerException。

Answer 1

创建两个流作为子流，然后每个流中的数据应该在父流和其他子流中可用。

将数据映射到子流在子流程会话开始之前。将子流中的数据映射回当父流程完成时子流完成和父流程会议恢复。

Spring Web Flow：如何将值从一个流传递到另一个流

1 个答案: