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我有一个表格，其中预先填充数据库的值， 用户可以在其中更改和保存值。用Spring web flow取消
1）我有一个地址文本从数据库预先填充，并有一个选项来修改英国纽约按钮，并点击这里按钮它需要到下一页的地址将填充，如果用户想改变他可以更改并保存，否则他可以取消它...但是如果地址是空白的并且取消它，那么它将以空白值更新。
<view-state id="selectUKAddress" model="address" view="../updateDetails/selectUKAddress.jsp">
<transition on="populate" to="ukAddressSelectionAction" />
<transition on="continue" to="updateDetails">
<set name="viewScope.addressPayload" value="new onlinereg.action.payload.AddressActionPayload(address, studentData, addressType)" />
<evaluate expression="addressAction.execute(addressPayload)" />
</transition>
<transition on="cancel" to="updateDetails" validate="false" >
</transition>
</view-state>
<view-state id="updateDetails" model="studentData" view="../updateDetails/updateDetails.jsp">
<on-entry>
<evaluate expression="navigationVO.personalDetails=true" />
<evaluate expression="navigationVO.activeTab='personalDetails'" />
<set name="viewScope.disabilityCodes" value="registrationService.getDisabilityCodes()" />
<set name="viewScope.legacyDisabilityCodes" value="registrationService.getLegacyDisabilityCodes()" />
<set name="viewScope.ethnicityCodes" value="registrationService.getEthnicityList()" />
<set name="viewScope.countries" value="registrationService.getCountries()" />
<set name="viewScope.nationality" value="registrationService.getNationality()" />
<set name="viewScope.qualification" value="registrationService.getQualification()" />
<set name="viewScope.university" value="registrationService.getUniversity()" />
</on-entry>
<transition on="updateUKHomeAddress" to="selectUKAddress" validate="false">
<evaluate expression="studentData.homeAddress = addressService.generateUKAddress(studentData.homeAddress)" />
<set name="flowScope.address" value="studentData.homeAddress" />
<set name="flowScope.addressType" value="@[email protected]_ADDRESS" />
</transition>
<transition on="updateNonUKHomeAddress" to="selectNonUKAddress" validate="false">
<evaluate expression="studentData.homeAddress = addressService.generateNonUKAddress(studentData.homeAddress)" />
<set name="flowScope.address" value="studentData.homeAddress" />
<set name="flowScope.addressType" value="@[email protected]_ADDRESS" />
</transition>
<transition on="updateUKTermAddress" to="selectUKAddress" validate="false">
<evaluate expression="studentData.termAddress = addressService.generateUKAddress(studentData.termAddress)" />
<set name="flowScope.address" value="studentData.termAddress" />
<set name="flowScope.addressType" value="@[email protected]_ADDRESS" />
</transition>
<transition on="updateHallsTermAddress" to="selectHallsAddress" validate="false">
<evaluate expression="studentData.termAddress = addressService.generateHallsAddress(studentData.termAddress)" />
<set name="flowScope.address" value="studentData.termAddress" />
<set name="flowScope.addressType" value="@[email protected]_ADDRESS" />
</transition>
<transition on="updateNonUKTermAddress" to="selectNonUKAddress" validate="false">
<evaluate expression="studentData.termAddress = addressService.generateNonUKAddress(studentData.termAddress)" />
<set name="flowScope.address" value="studentData.termAddress" />
<set name="flowScope.addressType" value="@[email protected]_ADDRESS" />
</transition>
<transition on="continue" to="finish" />
</view-state>