java - 基于xpath值创建动态xml树

Question

我想基于 xpath 创建一个动态 xml 树。假设我的 xpath 值为

Product/Organization/RegisteredDetail/something

我想以以下格式输入值。

<product>
   <organization>
        <registeredDetail>
                    <something>valueOfSomething</something>
        </registeredDetail>
    </organization>
<product>

简而言之，我想通过读取 xpath 创建一个 TreeView /树表。我想将值放在最里面的子节点上，并在树结构中显示值的位置，或者只是以树形式显示子节点的位置。 xpath 的值会有所不同。任何使用 java 或 jquery 的建议对我来说都很有值(value)。

我尝试实现@ThW 给出的建议。我做了一些修改:

var dom = document.implementation.createDocument("", "", null);
var node = dom;

新代码:

var pathmap = new Object(); 
var path1 = 'Product/Organization/RegisteredDetail/something';
var path2 = 'Product/Organization/RegisteredDetail';
var path3 = 'Product/Organization/RegisteredDetail/anything/nothing';
pathmap[path1] = 'Product/Organization/RegisteredDetail/something';
pathmap[path2] = 'Product/Organization/RegisteredDetail';
pathmap[path3] = 'Product/Organization/RegisteredDetail/anything/nothing';

console.log(pathmap);
for (var path in pathmap) {
  var parts = path.split(/\//);

  for (var i = 0; i < parts.length; i++) {
    node = node.appendChild(dom.createElement(parts[i]));
  }
  node.appendChild(dom.createTextNode('valueOfSomething'));
}
var serializer = new XMLSerializer();
console.log(dom);

我得到的输出是

正如您所看到的，树节点是重复的。我需要将 valueOfSomething 添加到它所属的位置。如果该节点存在，则无需重新创建该节点，只需添加一个新的子节点即可。像这样的东西

<product>
       <organization>
             <registeredDetail>
                            valueOfSomethng
                             <something>valueOfSomethng</something>
                             <anything>
                                     <nothing>valueOfSomethng</nothing>
                             </anything>
            </registeredDetail>
        </organization>
</product>

我计划将 xpath 和 valueOfSomething 的值放入 hashMap 中。并动态放置“valueOfSomething”的值。

Answer 1

Xpath 允许使用更多语法。结果不一定是可以解析为元素名称列表的东西。例如/product//something将选择product中的任何后代something节点。

如果您有元素名称列表，您可以轻松地从中创建节点。 XPath 可用于获取现有节点:

function addElementByPath(parent, path, value) {
  var node = parent;
  var parts = path.split(/\//);
  var dom = parent.ownerDocument;
  var existingNode;

  for (var i = 0; i < parts.length; i++) {
    existingNode = dom.evaluate(
      parts[i], node, null, XPathResult.FIRST_ORDERED_NODE_TYPE, null
    ).singleNodeValue;
    if (existingNode) {
      node = existingNode;
    } else {
      node = node.appendChild(dom.createElement(parts[i]));
    }
  }
  node.appendChild(dom.createTextNode(value));
}

var paths = [
  'Product/Organization/RegisteredDetail/something',
  'Product/Organization/RegisteredDetail',
  'Product/Organization/RegisteredDetail/anything/nothing',
  'Some/OtherPath'
];

var dom = document.implementation.createDocument("", "", null);
var root = dom.appendChild(dom.createElement('tree'));

for (var i = 0; i < paths.length; i++) {
  addElementByPath(root, paths[i], paths[i])
}

console.dirxml(dom);

输出:

<tree>
  <Product>
    <Organization>
      <RegisteredDetail>
        <something>Product/Organization/RegisteredDetail/something</something>
        Product/Organization/RegisteredDetail
        <anything>
          <nothing>Product/Organization/RegisteredDetail/anything/nothing</nothing>
        </anything>
      </RegisteredDetail>
    </Organization>
  </Product>
  <Some>
    <OtherPath>Some/OtherPath</OtherPath>
  </Some>
</tree>