Question

我正试图在Thymeleaf中绑定一个列表，并已按照教程进行搜索并在此处搜索；我在提交时的绑定索引中有一个问题被跳过，然后被超出。首先，我将详细说明代码，核心内容如下：

package com.ziath.manu.stockcheck.model;

import java.util.UUID;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import org.apache.commons.lang3.builder.ToStringBuilder;

@Entity
public class StockItem {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private UUID id;
    private String itemId;
    private String description;
    private Integer currentStockLevel;
    private Integer warnStockLevel;
    private Integer errorStockLevel;
    private Boolean purchaseOrderPlaced;

    public StockItem() {
        super();
       warnStockLevel = 0;
       errorStockLevel = 0;
    }

    public StockItem(String itemId, String description, Integer stockLevel) {

        this();
        this.itemId = itemId;
        this.description = description;
        this.currentStockLevel = stockLevel;
    }

    public String getItemId() {
        return itemId;
    }

    public void setItemId(String id) {
        this.itemId = id;
    }

    public String getDescription() {
        return description;
    }

    public void setDescription(String description) {
        this.description = description;
    }

    public Integer getCurrentStockLevel() {
        return currentStockLevel;
    }

    public void setCurrentStockLevel(Integer stockLevel) {
        this.currentStockLevel = stockLevel;
    }

    public String toString() {
        return ToStringBuilder.reflectionToString(this);
    }

    public Integer getWarnStockLevel() {
        return warnStockLevel;
    }

    public void setWarnStockLevel(Integer warnStockLevel) {
        this.warnStockLevel = warnStockLevel;
    }

    public Integer getErrorStockLevel() {
        return errorStockLevel;
    }

    public void setErrorStockLevel(Integer errorStockLevel) {
        this.errorStockLevel = errorStockLevel;
    }

    public Boolean getPurchaseOrderPlaced() {
        return purchaseOrderPlaced;
    }

    public void setPurchaseOrderPlaced(Boolean purchaseOrderPlaced) {
        this.purchaseOrderPlaced = purchaseOrderPlaced;
    }

    public UUID getId() {
        return id;
    }

    public void setId(UUID id) {
        this.id = id;
    }

}

然后我们有一个包装器，以便可以绑定列表：

package com.ziath.manu.stockcheck.model;

import java.util.ArrayList;
import java.util.List;

public class StockItems {

    private List<StockItem> stockItems = new ArrayList<>();

    public List<StockItem> getStockItems() {
        return stockItems;
    }

    public void setStockItems(List<StockItem> stockItems) {
        this.stockItems = stockItems;
    }


}

然后在此之后，我们有了百里香模板，将详细信息绑定到表单：

<!DOCTYPE HTML>
<html xmlns:th="http://www.thymeleaf.org">
<head>
<title>Stock Level from Manu</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
</head>
<body>
    <form action="#" th:object="${formItems}" th:action="@{/saveStockLevelAlerts}" method="post">
        <table>
            <tr th:each="stockItem, itemStat : *{stockItems}">

                <td th:text="${__${itemStat.index}__}" />
                <td th:text="${stockItem.itemId}" />
                <td th:text="${stockItem.description}" />
                <td th:text="${stockItem.currentStockLevel}" />
                <!-- if you want to know what this is go to https://www.baeldung.com/thymeleaf-list -->
                <input type="hidden" th:field="${formItems.stockItems[__${itemStat.index}__].id}" th:value="${stockItem.id}">
                <input type="hidden" th:field="${formItems.stockItems[__${itemStat.index}__].itemId}" th:value="${stockItem.itemId}">
                <input type="hidden" th:field="${formItems.stockItems[__${itemStat.index}__].description}" th:value="${stockItem.description}">
                <input type="hidden" th:field="${formItems.stockItems[__${itemStat.index}__].currentStockLevel}" th:value="${stockItem.currentStockLevel}">

                <td><input th:field="${formItems.stockItems[__${itemStat.index}__].warnStockLevel}" th:value="${stockItem.warnStockLevel}"></td>
                <td><input th:field="${formItems.stockItems[__${itemStat.index}__].errorStockLevel}" th:value="${stockItem.errorStockLevel}"></td>
            </tr>
        </table>
        <input type="submit" id="submitButton" th:value="Save">
        <input type="reset" id="resetButton" name="cancel" th:value="Cancel"/>
    </form>
</body>
</html>

因此，这将很好地显示并显示其中有305个项目。当我单击Submit时，一切正常，直到我达到256个项目为止（注意-256可能是一个线索，但这将是一个字节变量！）。然后我得到一个索引超出范围错误，如下所示：

stock items size 256
com.ziath.manu.stockcheck.model.StockItem@50fa1f72[id=b9019869-0e10-4d24-bddd-173fb75f6570,itemId=Washer M3 Silver,description=Washer M3 Silver,currentStockLevel=26,warnStockLevel=0,errorStockLevel=0,purchaseOrderPlaced=<null>]
2019-02-01 12:54:55.509 ERROR 28408 --- [nio-8084-exec-8] o.a.c.c.C.[.[.[/].[dispatcherServlet]    : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.springframework.beans.InvalidPropertyException: Invalid property 'stockItems[256]' of bean class [com.ziath.manu.stockcheck.model.StockItems]: Index of out of bounds in property path 'stockItems[256]'; nested exception is java.lang.IndexOutOfBoundsException: Index: 256, Size: 256] with root cause

所以看来我可以毫无问题地读出305个项目，但是当我尝试再次添加它们时，我认为Thymeleaf应该执行以下操作：

制作一个新的StockItem对象
从StockItems对象获取列表
将该StockItem添加到列表的末尾
对于每个属性，请在列表末尾获取StockItem并设置属性

这很好，直到列表中超过256个元素为止。

有人有处理更大列表的例子吗，对发生的事情有任何想法吗？

在此先感谢您的帮助。

干杯

尼尔

Answer 1

我找到了解决方案，与Thymeleaf无关。 Spring对可以绑定到255的项目设置了限制。如果要提高级别，可以通过添加以下内容来更改此限制：

@InitBinder
public void initBinder(WebDataBinder dataBinder) {
    dataBinder.setAutoGrowCollectionLimit(600);
}

Thymeleaf中的绑定列表；索引超出范围

1 个答案: