Question

我需要编写一个简单的函数来在java上使用DOM解析来自Url的xml。这是xml url。

如果我将其写入/assets/exampleXML.xml并使用此代码，则一切正常。

static final String NODE_EMP = "Record";
static final String NODE_NAME = "Nominal";
static final String NODE_SALARY = "Value";
.....
public void onBtnClick3(View v) {
    XMLDOMParser parser = new XMLDOMParser();
    try {
        InputStream is = getAssets().open("exampleXML2.xml");
        DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
        DocumentBuilder db = dbf.newDocumentBuilder();
        Document doc = db.parse(is);
        NodeList nodeList = doc.getElementsByTagName(NODE_EMP);
        for (int i = 0; i < nodeList.getLength(); i++) {
            Element e = (Element) nodeList.item(i);
            nameText.append(parser.getValue(e, NODE_NAME) + "\n");
            nameText.append(parser.getValue(e, NODE_SALARY) + "\n");
        }

但如果我换到

public static final String QUERY_URL = "http://www.cbr.ru/scripts/XML_dynamic.asp?......";

public void onBtnClick(View v) {
    XMLDOMParser parser = new XMLDOMParser();
    try {
        URL url = new URL(QUERY_URL);
        URLConnection conn = url.openConnection();
        DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
        DocumentBuilder db = dbf.newDocumentBuilder();
        Document doc = db.parse(conn.getInputStream());

这不起作用。有什么问题以及如何解决？我已经读过了，但它不起作用。请帮帮我。 How to read XML response from a URL in java?

Answer 1

我不喜欢手工解析XML，我通常使用POJO和简单的XML来为我工作。以下是使用Volley进行http通信和Simple XML

的示例

的POJO

substr

UnitTest

function get_string_between($string, $start, $end) {
   // make sure we escape all parts of the pattern
    $start = preg_quote($start, '/');
    $end= preg_quote($end, '/');

    // create the pattern
    $pattern = "/$start(.*?)$end/su"; // using s and u pattern modifiers

    if (preg_match($pattern, $string, $match)) {
        return $match[1];
    }
}


$str = <<<'STR'
تفاحة:
<br><img src="http://asite.com/1.jpg"><br>
<a href="https://asite.com/1.html">تفاحة</a> <br />

<a href="http://asite.com/link.html">link1 </a> <br />
<a href="http://asite.com/link.html">link2 </a> <br />
<a href="http://asite.com/link.html">link3 </a> <br />
<a href="http://asite.com/link.html">link4 </a> <br />
<a href="http://asite.com/link.html">link5 </a> <br />

--------------------------------------<br>
STR;

$start = 'تفاحة:';
$end = '--------------------------------------<br>';

var_dump(get_string_between($str, $start, $end));

/*
output

string(380) "

<br><img src="http://asite.com/1.jpg"><br>
<a href="https://asite.com/1.html">تفاحة</a> <br />


<a href="http://asite.com/link.html">link1 </a> <br />
<a href="http://asite.com/link.html">link2 </a> <br />
<a href="http://asite.com/link.html">link3 </a> <br />
<a href="http://asite.com/link.html">link4 </a> <br />
<a href="http://asite.com/link.html">link5 </a> <br />

"

*/

如何从URL读取XML响应？

1 个答案: