解析xml android的字符串

Question

我在android中解析一个名为responseText的xml字符串时遇到了一些麻烦.xml完全有效,并具有以下结构:

<plan>
<entry>
<name>john</name>
<address>uk</address>
</entry>
<entry>
<name>joe</name>
<address>usa</address>
</entry>
</plan>

我用来解析String的代码如下:

    try {
        DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
        DocumentBuilder db = dbf.newDocumentBuilder();
        InputSource is = new InputSource();

        is.setCharacterStream(new StringReader(responseText));

        Document doc = db.parse(is);
        NodeList nodes = doc.getElementsByTagName("entry");

        for (int i = 0; i < nodes.getLength(); i++) {

            Element element = (Element) nodes.item(i);

            NodeList name = ((Document) element)
                    .getElementsByTagName("name");
            Element line = (Element) name.item(0);
            Toast.makeText(Containers.this,
                    getCharacterDataFromElement(line), Toast.LENGTH_SHORT)
                    .show();

            NodeList title = ((Document) element)
                    .getElementsByTagName("address");
            line = (Element) title.item(0);
            Toast.makeText(Containers.this,
                    getCharacterDataFromElement(line), Toast.LENGTH_SHORT)
                    .show();

        }
    } catch (Exception e) {
        e.printStackTrace();
    }
}

public static String getCharacterDataFromElement(Element e) {
    Node child = ((Node) e).getFirstChild();
    if (child instanceof CharacterData) {
        CharacterData cd = (CharacterData) child;
        return cd.getData();
    }
    return "?";

}

我只是使用简单的toast将xml数据打印到屏幕上.但是,当我进入for循环时,我得到一个IOexception.知道什么是错的吗？

Answer 1

您是从正确的包中导入类型的吗？就像是

import java.io.StringReader;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

import org.w3c.dom.CharacterData;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;

import android.sax.Element; // Wrong Element class

将上次导入更改为

import org.w3c.dom.Element;

然后再试一次.