从 hashmap/arraylist 打印 thymeleaf 中的键/值 [英] print key/value in thymeleaf from hashmap/arraylist

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问题描述

java/springboot 中的代码:

@RequestMapping(value = "results")公共字符串结果(模型模型,@RequestParam 字符串搜索类型,@RequestParam String searchTerm) {model.addAttribute("columns", ListController.columnChoices);ArrayList>作业比值 = 作业数据.findforValue(searchTerm);model.addAttribute("items", jobsbyval);返回搜索";}

html/thymeleaf 中的代码:

<表格><tr th:each="item : ${items}"><!--每个循环开始--><td th:text="${item}"></td>//item.value 或 item.key 不起作用!!</tr><!--循环结束--></tbody>

这是 html 输出.

{header 1=something, header 2=Analyst, category 3=somename, location=somewhere, Skill=Stats}

所需的表格格式的 HTML 输出(键/值)是:

header 1 东西标题 2 分析师类别somename某处的位置技能统计

解决方案

是的,它不起作用,因为 items(或 jobsbyval)不是地图,但它是映射列表,即:ArrayList>作业比值.

您的 thymeleaf 片段只是打印列表中第一个也是唯一一个地图的字符串表示.如果需要迭代列表中的所有映射,则需要一个嵌套循环,例如:

模型:

 List>mapsList = new ArrayList>();映射<字符串,字符串>map1 = new HashMap();map1.put("keyinmap1", "valueinmap1");映射<字符串,字符串>map2 = new HashMap();map2.put("keyinmap2", "valueinmap2");mapsList.add(map1);mapsList.add(map2);modelMap.put("mapsList", mapsList);

查看:

<div th:each="mapEntry : ${map}"><span th:text="${mapEntry.key}"></span>=<span th:text="${mapEntry.value}"></span>

输出:

keyinmap1 = valueinmap1keyinmap2 = valueinmap2

th:each 接受映射,在这种情况下:

<块引用>

迭代映射时,迭代变量将是类java.util.Map.Entry

有关详细信息 - 请参阅此处.>

The code in java/springboot:

@RequestMapping(value = "results")
public String results(
        Model model, 
        @RequestParam String searchType,
        @RequestParam String searchTerm) {

    model.addAttribute("columns", ListController.columnChoices);
    ArrayList<HashMap<String, String>> jobsbyval = JobData
            .findforValue(searchTerm);
    model.addAttribute("items", jobsbyval);
    return "search";
}

The code in html/thymeleaf:

<div>
  <table>
    <tbody>
      <tr th:each="item : ${items}">
        <!--each loop begins -->
        <td th:text="${item}"></td> //item.value or item.key dont work!!

      </tr>
      <!--loop ends -->
    </tbody>
  </table>
</div>

Here is the html ouput.

{header 1=something, header 2=Analyst, category 3=somename, location=somewhere, skill=Stats}

The desired HTML output(key/value) in table format would be:

header 1  something  
header 2  Analyst 
category  somename 
location  somewhere 
skill Stats

解决方案

Yes, it does not work because items (or jobsbyval) is not a map but it is a list of maps, namely: ArrayList<HashMap<String, String>> jobsbyval.

Your thymeleaf snippet just prints the string representation of the first and only map within the list. If you need to iterate all maps within the list you need a nested loop, for example:

Model:

    List<Map<String, String>> mapsList = new ArrayList<Map<String, String>>();

    Map<String, String> map1 = new HashMap<String, String>();
    map1.put("keyinmap1", "valueinmap1");
    Map<String, String> map2 = new HashMap<String, String>();
    map2.put("keyinmap2", "valueinmap2");

    mapsList.add(map1);
    mapsList.add(map2);

    modelMap.put("mapsList", mapsList);

View:

<div th:each="map : ${mapsList}">
     <div th:each="mapEntry : ${map}">
         <span th:text="${mapEntry.key}"></span> = 
         <span th:text="${mapEntry.value}"></span> 
     </div>
</div>

Output:

keyinmap1 = valueinmap1
keyinmap2 = valueinmap2

th:each accept maps, in this case:

When iterating maps, iter variables will be of class java.util.Map.Entry

For details - see here.

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