Question

im使用thymeleaf将index.html传递给包含LiveDataSet类的模型属性。但是我一直遇到这个错误。

    ***org.springframework.expression.spel.SpelEvaluationException: EL1008E: Property or field 'LiveDataSet' cannot be found on object of type 'com.ex.excom.controller.LiveDataController$LiveDataSet' - maybe not public or not valid?***
    at org.springframework.expression.spel.ast.PropertyOrFieldReference.readProperty(PropertyOrFieldReference.java:217)
PropertyOrFieldReference.java:217
    at org.springframework.expression.spel.ast.PropertyOrFieldReference.getValueInternal(PropertyOrFieldReference.java:104)
PropertyOrFieldReference.java:104
    at org.springframework.expression.spel.ast.PropertyOrFieldReference.access$000(PropertyOrFieldReference.java:51)
PropertyOrFieldReference.java:51
    at org.springframework.expression.spel.ast.PropertyOrFieldReference$AccessorLValue.getValue(PropertyOrFieldReference.java:406)
PropertyOrFieldReference.java:406
    at org.springframework.expression.spel.ast.CompoundExpression.getValueInternal(CompoundExpression.java:90)
CompoundExpression.java:90
    at org.springframework.expression.spel.ast.SpelNodeImpl.getValue(SpelNodeImpl.java:109)
SpelNodeImpl.java:109
    at org.springframework.expression.spel.standard.SpelExpression.getValue(SpelExpression.java:328)
SpelExpression.java:328
    at org.thymeleaf.spring5.expression.SPELVariableExpressionEvaluator.evaluate(SPELVariableExpressionEvaluator.java:263)
SPELVariableExpressionEvaluator.java:263
    at org.thymeleaf.standard.expression.VariableExpression.executeVariableExpression(VariableExpression.java:166)
VariableExpression.java:166
    at org.thymeleaf.standard.expression.SimpleExpression.executeSimple(SimpleExpression.java:66)
SimpleExpression.java:66

LiveDataController

@RestController
@Controller
public class LiveDataController extends BaseController
{
    public class LiveDataSet
    {

        String getActive;
        String getApparent;
        String getCurrent;
        String getEnergy;
    }
    public LiveDataSet getLiveDatas(){    
         ...
        LiveDataSet liveDatas = new LiveDataSet();

        liveDatas.getCurrent = "1234"
        liveDatas.getEnergy = "92.1"
        ...
        return liveDatas
    }
}

IndexController

@RequestMapping("/")
@PreAuthorize("hasAnyAuthority('ROLE_USER','ROLE_ADMIN')")
public String index(Model model, HttpSession session)
{

    LiveDataSet liveData = liveDataController.getLiveDatas();
    Optional<LiveDataSet> listOptLiveData = Optional.of(liveData);
    listOptLiveData.ifPresent(LiveDataSet -> model.addAttribute("liveData", liveData));     
    return "index";
}

index.html

<tr th:each="row : ${liveData}">
    <td th:text="${row.LiveDataSet}"></td>      
</tr>

我如何处理此错误。数据确实存在，但我什至可以在视图中看到数据。谢谢您阅读。

Answer 1

您要发送查看的

liveData是LiveDataSet的一个实例。在视图中，您以${row.LiveDataSet}的身份对其进行访问。这没有道理。 LiveDataSet中没有任何LiveDataSet字段！这就是为什么您会收到此错误。

Answer 2

您应该访问“对象”行的属性（这是我认为的LiveDataSet的实例）

<thead>
<tr>
<td>Col1</td>
<td>Col2</td>
<td>Col3</td>
</tr>
</thead>
<tbody>
    <tr th:each="row : ${liveData}">
        <td th:text="${row.attr1}"></td>
        <td th:text="${row.attr2}"></td>      
        <td th:text="${row.attr3}"></td>            
    </tr>
</tbdoy>

Answer 3

[[$$ liveData}]]

const a = '100110100011111000100110';
const b = '111111111111111111111110';

function andBin (one, two) {
  const _a = one.split('')
  const _b = two.split('')
  let result = ''

  _a.map((e, i) => {
    result += Number(e) & Number(_b[i])
  })

  return result

}

andBin(a, b) // 100110100011111000100110

问题是变量命名。如果我声明变量get + Active，则返回get属性，因此这会导致Java变量检测到故障，因此我更改了变量名称，并安全地返回了值。

Spring thymeleaf错误EL1008E在'LiveDataController $ LiveDataSet'类型的对象上找不到属性或字段，可能不是公共的或无效的吗？

3 个答案: