我有一个使用 Spring Web 流的 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>
我在这里的编辑功能有问题。在我的编辑页面中,我有用户名、旧密码、新密码和确认密码字段。
首先在 validateAccount 状态下,我检查数据库中是否存在用户名和旧密码,如果不存在,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,我会再次返回 queryAll。
QueryAll 状态获得用户在重新显示页面时将其填充到表单中的权限。当我将密码字段留空并且第一次单击编辑按钮时,它会引发 java.lang.NullPointerException。