如何在java中更改xml中元素的值？

Question

我有以下代码解析 xml 并获取元素的值：

        NodeList elem = dom.getElementsByTagName("quantity");
        LOG.info("elem.getLength: " + elem.getLength());
        int quantity = -1;
        for (int i = 0; i < elem.getLength(); i++) {
            Element linenl_quantity = (Element) elem.item(i);
            LOG.info(linenl_quantity.getAttributes().getNamedItem("value").getNodeValue());
            quantity = toInteger(linenl_quantity.getAttributes().getNamedItem("value").getNodeValue());
            linenl_quantity.setAttribute("value", String.valueOf(quantity));
        }

当我调用行 linenl_quantity.setAttribute("value", String.valueOf(quantity)) 时，出现以下错误：

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is java.lang.IllegalStateException: getWriter() has already been called for this response

我需要将元素 <quantity value="1.0" /> 的浮点值更改为 <quantity value="1" />。我设法获取了值，但我该如何更改它？

Answer 1

我找到了解决方案。

我如下编辑代码并将其移动到另一个 class（文件）。

NodeList elem = dom.getElementsByTagName("quantity");
int quantity = -1;
for (int j = 0; j < elem.getLength(); j++) {
    Element linenl_quantity = (Element) elem.item(j);
    quantity = (int)Double.parseDouble(linenl_quantity.getAttributes().getNamedItem("value").getNodeValue());
    LOG.info(String.valueOf(quantity));
}

如何在java中更改xml中元素的值？

How to change the value of an element in xml in java?

java

xml-parsing