主页 / 问题 / 553933
Accepted
Nikolay Baranenko
Asked:2020-08-10 18:48:12 +0000 UTC2020-08-10 18:48:12 +0000 UTC

将 JSON 从 JSTL 传递到 Java Script 的正确方法是什么？

  • 772

你好。

我正在尝试从 JSP 传递 JSON。

    <c:set var="json_text">
        [{"TIME_STAMP": "2016-07-25 02:30:22", "COUNTER": "COUNT_ALL", "VALUE": 635 }, { "TIME_STAMP": "2016-07-25 02:30:22", "COUNTER": "COUNT_BAD", "VALUE": 1 }, { "TIME_STAMP": "2016-07-25 02:30:22", "COUNTER": "QUALITY", "VALUE": 99.84 }, { "TIME_STAMP": "2016-07-25 02:31:22", "COUNTER": "COUNT_ALL", "VALUE": 642 }, { "TIME_STAMP": "2016-07-25 02:31:22", "COUNTER": "COUNT_BAD", "VALUE": 1 }, { "TIME_STAMP": "2016-07-25 02:31:22", "COUNTER": "QUALITY", "VALUE": 99.84 }]
        </c:set>
    
     <script type="text/javascript">
    var jsonString='<c:out value="${json_text}"/>';
    var jsonObj = JSON.parse(jsonString);
    </script>

重现 未捕获的语法错误：位置 2 的 JSON 中的意外标记 &

但是，如果您将整个内容直接复制到 Java 脚本中，那么一切正常。

    <script type="text/javascript">
    var jsonString='[{"TIME_STAMP": "2016-07-25 02:30:22", "COUNTER": "COUNT_ALL", "VALUE": 635 }, { "TIME_STAMP": "2016-07-25 02:30:22", "COUNTER": "COUNT_BAD", "VALUE": 1 }, { "TIME_STAMP": "2016-07-25 02:30:22", "COUNTER": "QUALITY", "VALUE": 99.84 }, { "TIME_STAMP": "2016-07-25 02:31:22", "COUNTER": "COUNT_ALL", "VALUE": 642 }, { "TIME_STAMP": "2016-07-25 02:31:22", "COUNTER": "COUNT_BAD", "VALUE": 1 }, { "TIME_STAMP": "2016-07-25 02:31:22", "COUNTER": "QUALITY", "VALUE": 99.84 }]';
    var jsonObj = JSON.parse(jsonString);
    </script>

告诉我有什么问题。

ps首先想到的是in var jsonString=''; 只传递了一个字符串，但以这种方式检查

<script type="text/javascript">
var JSONFromJSTL='<c:out value="${json_text}"/>';
jsonResult.push("Вывод JSON="+JSONFromJSTL);
result_json.innerHTML = jsonResult.join('<br>');
  </script>

在

<div id="result_json"></div>

这个结果被发送

JSON 输出= [{"TIME_STAMP": "2016-07-25 02:30:22", "COUNTER": "COUNT_ALL", "VALUE": 635 }, { "TIME_STAMP": "2016-07-25 02: 30:22", "COUNTER": "COUNT_BAD", "VALUE": 1 }, { "TIME_STAMP": "2016-07-25 02:30:22", "COUNTER": "QUALITY", "VALUE": 99.84 }, { "TIME_STAMP": "2016-07-25 02:31:22", "COUNTER": "COUNT_ALL", "VALUE": 642 }, { "TIME_STAMP": "2016-07-25 02:31 :22", "COUNTER": "COUNT_BAD", "VALUE": 1 }, { "TIME_STAMP": "2016-07-25 02:31:22", "COUNTER": "QUALITY", "VALUE": 99.84 }]

那些。正是需要什么。

javascript

2 个回答

  1. Best Answer

    您在 var jsonObj = ${json_text};中拥有的全部内容

    这就是取得结果的方式

    <script type="text/javascript">
    var jsonObj = ${json_text};
            var jsonResult = [];
            jsonResult.push("Вывод JSON="+'<c:out value="${json_text}"/>');
jsonResult.push("количество строк json="+jsonObj.length);
result_json.innerHTML = jsonResult.join('<br>');
 </script>

    • 3

  2. 在jsp中生成json，可以使用标签库http://json-taglib.sourceforge.net

    • 0

相关问题