Spring Webflow 数组列表

Question

我的网站上有一个表单，它询问用户信息（如姓名、地址等），主要是字符串、一个 int 和一个 ArrayList。我使用 Spring webflow 主要是为了允许查看视图状态，以便用户可以返回并编辑字段，并且因为我也使用了一些其他表单，所以我试图保持我的代码一致。

我遇到的问题是我的 Arraylist。我希望用户最多可以添加 10 位医生（姓名、保单编号、专业），但我不断收到 BeanException 和错误消息，表明我的列表为空。当我点击评论按钮进入下一个视图时，页面将重新加载并抛出我在底部发布的错误。

这是我的 spring webflow 的一部分： 在视图 PracticeReviewRequest 我用一个新的 Arraylist 实例化我的 arrayList

    <set name="flowScope.pageDescription" value="'Please complete the form below to submit your request for a practice review.'"/>
</on-start>

<view-state id="practiceReviewRequest" view="/components/risk/practiceReview" model="practiceReviewForm">
    <on-entry>
        <set name="flowScope.practiceReviewForm.physicians" value="new java.util.ArrayList()"/>
    </on-entry>
    <transition on="review" to="practiceReviewRequestReview"/>
    <transition on-exception="org.tmlt.data.dao.DataAccessException" to="practiceReviewRequest">
        <set name="flowScope.exception" value="rootCauseException"/>
    </transition>
</view-state>

<view-state id="practiceReviewRequestReview" view="/components/risk/email">
    <transition on="submit" to="practiceReviewRequestSubmit"/>
    <transition on-exception="org.tmlt.data.dao.DataAccessException" to="practiceReviewRequest">
        <set name="flowScope.exception" value="rootCauseException"/>
    </transition>
</view-state>

这是我的 Object practiceReviewRequest 的艺术

@XmlAccessorType(XmlAccessType.FIELD) 公共类 PracticeReviewRequestImpl 实现 IPracticeReviewRequest, Serializable {

private static final long serialVersionUID = 1L;

private String submitName;
private String policyType;
private String groupName;
private String policyNumber;
private int physNum;
private List<IPracticeReviewRequest> physicians = new ArrayList<>(15);

@Override
public List<IPracticeReviewRequest> getPhysicians() {
    return physicians;
}

@Override
public void setPhysicians(List<IPracticeReviewRequest> physicians) {
    this.physicians = physicians;
}

@Override
public int getPhysNum() {
    return physNum;
}

...

这是我的医师对象： 公共类 PracticeReviewRequestPhysicianImpl 实现 IPracticeReviewRequestPhysician, Serializable {

private static final long serialVersionUID = 1L;

private String name;
private String policyNumber;
private String specialty;

@Override
public String getName() {
    return name;
}

@Override
public String getPolicyNumber() {
    return policyNumber;
}

@Override
public String getSpecialty() {
    return specialty;
}

@Override
public void setName(String name) {
    this.name = name;
}

@Override
public void setPolicyNumber(String policyNumber) {
    this.policyNumber = policyNumber;
}

@Override
public void setSpecialty(String specialty) {
    this.specialty = specialty;
}

...

这是我的 .ftl 的一部分（为了解决这个问题，我只硬编码一个外业医师 [0].name 而不是使用我的 JS 函数循环医师 [i].name 等...）（这都在一个表单标签中，包含隐藏的输入类型 flowExecutionKey）

这是我在我的 tomcat 中看到的错误消息。

2018-04-12 11:00:15,916 调试 springframework.binding.mapping.impl.DefaultMapper：源 [org.springframework.webflow.core.collection.LocalParameterMap] 和目标 [org.tmlt.data. model.impl.PracticeReviewRequestImpl] 2018-04-12 11:00:15,923 调试pringframework.binding.mapping.impl.DefaultMapping：添加映射结果[TargetAccessError@c60ad7映射=参数：'执行'->执行，代码='propertyNotFound'，错误=真，错误原因= org.springframework.binding.expression.PropertyNotFoundException：找不到属性，originalValue = 'e7s1'，mappedValue = [null]] 2018-04-12 11:00:15,924 调试 pringframework.binding.mapping.impl.DefaultMapping：添加映射结果 [Success@122d6f5 映射 = 参数：'submitName' -> submitName，代码 = '成功'，错误 = false，originalValue ='测试'，mappedValue ='测试'] 2018-04-12 11:00:15,924 DEBUG pringframework.binding.mapping.impl.DefaultMapping：添加映射结果 [Success@6ced27 mapping = parameter:'policyType' -> policyType, code = 'success', error = false, originalValue ='是'，mappedValue ='是'] 2018-04-12 11:00:15,925 调试pringframework.binding.mapping.impl.DefaultMapping：添加映射结果[成功@769c4映射=参数：'组名'->组名，代码='成功'，错误=假，原始值='Tset'，映射值 ='Tset'] 2018-04-12 11:00:15,925 调试pringframework.binding.mapping.impl.DefaultMapping：添加映射结果[成功@ae3690映射=参数：'policyNumber'-> policyNumber，代码='成功'，错误= false，originalValue = 'SEt1'，映射值 = 'SEt1'] 2018-04-12 11:00:15,925 调试pringframework.binding.mapping.impl.DefaultMapping：添加映射结果[成功@1ded18e映射=参数：'physNum'-> physNum，代码='成功'，错误=假，原始值='1'，映射值 ='1'] 2018-04-12 11:00:15,925 调试 pringframework.binding.mapping.impl.DefaultMapping：添加映射结果 [TargetAccessError@1c1147 映射 = 参数：'physicians[0].name'->医师[0].name，代码='evaluationException'，error = true，errorCause = org.springframework.binding.expression.EvaluationException：在上下文 [class org.tmlt.data.model.impl .PracticeReviewRequestImpl] 到 [Ttest], originalValue = 'Ttest', mappedValue = [null]] 2018-04-12 11:00:15,926 调试 pringframework.binding.mapping.impl.DefaultMapping：添加映射结果 [TargetAccessError@1461909 mapping = null -> eventId_review，code = 'propertyNotFound'，error = true，errorCause = org.springframework .binding.expression.PropertyNotFoundException：找不到属性，originalValue = [null]，mappedValue =enter code here [null]] 2018-04-12 11:00:15,927 调试 springframework.binding.mapping.impl.DefaultMapper：完成源 [org.springframework.webflow.core.collection.LocalParameterMap] 和目标 [org.tmlt.data.model.impl 之间的映射.PracticeReviewRequestImpl];总映射 = 8；总错误 = 3 2018-04-12 11:00:15,927 调试 g.springframework.webflow.mvc.view.AbstractMvcView：模型绑定导致错误；将错误消息添加到上下文 2018-04-12 11:00:15,931 调试 ingframework.binding.message.DefaultMessageContext：使用 [DefaultMessageResolver@dc00ab 源 = 'physicians[0].name'，严重性 = 错误，代码 = 数组 ['practiceReviewForm.physicians[ 0].name.evaluationException', 'practiceReviewForm.physicians.name.evaluationException', 'physicians[0].name.evaluationException', 'physicians.name.evaluationException', 'name.evaluationException', 'evaluationException'], args =数组[[MessageBuilder.ResolvableArgument@cd5bdf arg = 'physicians[0].name']], defaultText = 'evaluationException on doctors[0].name'] 2018-04-12 11:00:15,932 DEBUG ingframework.binding.message.DefaultMessageContext：添加已解决的消息 [Message@17402e3 source = 'physicians[0].name'，severity = ERROR，text ='evaluationException on doctors[0] 。姓名'] 2018-04-12 11:00:15,932 调试 g.springframework.webflow.mvc.view.AbstractMvcView：验证模型 2018-04-12 11:00:15,934 调试 org.springframework.webflow.engine.ViewState：渲染 + [ServletMvcView@152a4e0 视图 = info.magnolia.module.blossom.view.TemplateView：名称“/components/risk/practiceReview” ; URL [/MyTMLT/templates/components/mytmlt/myTMLTComponent.ftl]] 2018-04-12 11:00:15,934 调试 org.springframework.webflow.engine.ViewState：Flash 范围 = map[[empty]] 2018-04-12 11:00:15,934 调试 org.springframework.webflow.engine.ViewState：Messages = [DefaultMessageContext@19f94a4 sourceMessages = map[[null] -> list[[empty]]，'physicians[0].name ' -> list[[Message@17402e3 source ='physicians[0].name'，severity = ERROR，text ='evaluationException on doctors[0].name']]]] 2018-04-12 11:00:15,935 调试 g.springframework.webflow.mvc.view.AbstractMvcView：渲染 MVC [info.magnolia.module.blossom.view.TemplateView：名称“/components/risk/practiceReview”； URL [/MyTMLT/templates/components/mytmlt/myTMLTComponent.ftl]] 与模型图 [{currentUser=null, viewScope=map[[empty]], componentTemplatePath=/MyTMLT/templates/components/risk/practiceReview.ftl, flowExecutionKey =e7s1, flowExecutionUrl=/riskpracticereviewrequest-flow?execution=e7s1, pageDescription=请填写下面的表格提交您的实践审查请求。, flashScope=map[[empty]], flowRequestContext=[RequestControlContextImpl@1eb4074 externalContext = org. springframework.webflow.mvc.servlet.MvcExternalContext@1f446e1，currentEvent = [null]，requestScope = map[[empty]]，attributes = map[[empty]]，messageContext = [DefaultMessageContext@19f94a4 sourceMessages = map[[null] - > list[[empty]], 'physicians[0].name' -> list[[Message@17402e3 source = 'physicians[0].name', severity = ERROR, text = 'evaluationException on doctors[0].name ']]]], flowExecution = [FlowExecutionImpl@25b8a3 flow = 'riskpracticereviewrequest-flow', flowSessions = list[[FlowSessionImpl@ec7f63 flow = 'riskpracticereviewrequest-flow'，状态 = 'practiceReviewRequest'，范围 = map['viewScope' -> map[[empty]]，'componentTemplatePath' -> '/MyTMLT/templates/components/risk/practiceReview.ftl'，' pageDescription' -> '请填写下面的表格以提交您的练习审查请求。', 'practiceReviewForm' -> org.tmlt.data.model.impl.PracticeReviewRequestImpl@174ec05]]]]], org.springframework.validation .BindingResult.practiceReviewForm=org.springframework.webflow.mvc.view.BindingModel: 1 个错误 字段 'physicians[0].name' 上的对象 'practiceReviewForm' 中的字段错误：拒绝值 [null]；代码 [];论据 [];默认消息 [evaluationException on doctors[0].name], practiceReviewForm=org.tmlt.data.model.impl.PracticeReviewRequestImpl@174ec05}] 2018-04-12 11:00:15,944 DEBUG ion.repository.impl.DefaultFlowExecutionRepository：放置流执行'[FlowExecutionImpl@25b8a3 flow ='riskpracticereviewrequest-flow'，flowSessions = list[[FlowSessionImpl@ec7f63 flow ='riskpracticereviewrequest-flow' , state = 'practiceReviewRequest', scope = map['viewScope' -> map[[empty]], 'componentTemplatePath' -> '/MyTMLT/templates/components/risk/practiceReview.ftl', 'pageDescription' -> '请填写下面的表格以提交您的练习审查请求。', 'practiceReviewForm' -> org.tmlt.data.model.impl.PracticeReviewRequestImpl@174ec05]]]]' 到存储库

如果您有任何问题，请告诉我。我整个星期都被困在这上面。感谢您的宝贵时间。

Answer 1

如果我的 ArrayList 为空，我通过在我的对象 impl 类 PracticeReviewRequestPhysicianImpl 中实例化我的 ArrayList 来解决我的问题

 public List<IPracticeReviewRequestPhysician> getPhysicians() {
        if(physicians.isEmpty()){
            for(int i = 0;i < MAX_PHYSICIANS;i++) {


  physicians.add(TMLTObjectFactory.getNewPracticeReviewPhysician());
            }
        }
        return physicians;
    }

我的错误的原因是我为一个不存在的索引分配了一个值，导致了 indexoutofbounds 异常。我的日志中有一些线索抱怨我的列表是空的。