从xml获取数据到java

Question

如何从 java 中使用 php 生成的 xml 中获取数据。 我需要将数据显示在我的 android 应用程序的列表视图中。

phpcode 从 mysqlquery 中获取数据并获取 variabel xml 中的数组并将其放在 echo 上。 mysqlquery 的数据通过 POST 来自 android 应用程序。

php代码：

//MySQL zugangsdaten
$server = "server";
$datenbank = "database";
$username = "username";
$passwort = "password";

//Verbindung zur MySqldatenbank herstellen
$link = mysql_connect($server, $username, $passwort);
if (!$link) die(mysql_error());

//Datenbank auswählen
$db = mysql_select_db($datenbank, $link);
//<---- End Login ---->

$_linie = htmlspecialchars(mysql_real_escape_string($_POST["linie"]), ENT_COMPAT);
$_richtung = htmlspecialchars(mysql_real_escape_string($_POST["richtung"]), ENT_COMPAT);

$sql_befehl = "SELECT * From Kontrolleure where linie = '$_linie' AND richtung = '$_richtung'";
$query = mysql_query($sql_befehl, $link);
if(mysql_error())
            {
                die(mysql_error());
            }

while($result = mysql_fetch_array($query, MYSQL_ASSOC))
        {   
            $count = $count + 1;
            $xml = $xml."<Konduktor>";
            $xml = $xml."<id>".$result['id']."</id>";
            $xml = $xml."<linie>".$result['linie']."</linie>";
            $xml = $xml."<endstation>".$result['richtung']."</endstation>";
            $xml = $xml."<station>".$result['station']."</station>";
            $xml = $xml."<zeit>".$result['zeit']."</zeit>";
            $xml = $xml."</Konduktor>";
        }
echo "<Konduktors count=\"$count\">";
echo $xml;
echo "</Konduktors>";

xml 响应如下所示：

<Konduktors count="3">
   <Konduktor>
      <id>29</id>
      <linie>S23</linie>
      <endstation>Langenthal</endstation>
      <station>Brugg AG</station>
      <zeit>17:36:34</zeit>
   </Konduktor>
   <Konduktor>
      <id>30</id>
      <linie>S23</linie>
      <endstation>Langenthal</endstation>
      <station>Lupfig</station>
      <zeit>17:37:12</zeit>
   </Konduktor>
   <Konduktor>
      <id>32</id>
      <linie>S23</linie>
      <endstation>Langenthal</endstation>
      <station>Birr</station>
      <zeit>16:23:30</zeit>
    </Konduktor>
</Konduktors>

谢谢！

Answer 1

这类东西有xml解析工具。在我的工作中，我们使用 XMLBeans： http://xmlbeans.apache.org/

我发现使用它相当简单，而且我对这类东西有点业余。

Answer 2

JAXB 可以轻松处理：

import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
import java.io.StringReader;
import java.util.ArrayList;
import java.util.List;

public class JaxbExample {
    public static void main(String[] args) throws JAXBException {
        String xml =
                "<Konduktors count=\"3\">\n" +
                "   <Konduktor>\n" +
                "      <id>29</id>\n" +
                "      <linie>S23</linie>\n" +
                "      <endstation>Langenthal</endstation>\n" +
                "      <station>Brugg AG</station>\n" +
                "      <zeit>17:36:34</zeit>\n" +
                "   </Konduktor>\n" +
                "   <Konduktor>\n" +
                "      <id>30</id>\n" +
                "      <linie>S23</linie>\n" +
                "      <endstation>Langenthal</endstation>\n" +
                "      <station>Lupfig</station>\n" +
                "      <zeit>17:37:12</zeit>\n" +
                "   </Konduktor>\n" +
                "   <Konduktor>\n" +
                "      <id>32</id>\n" +
                "      <linie>S23</linie>\n" +
                "      <endstation>Langenthal</endstation>\n" +
                "      <station>Birr</station>\n" +
                "      <zeit>16:23:30</zeit>\n" +
                "    </Konduktor>\n" +
                "</Konduktors>";
        Object object = JAXBContext.newInstance(Konduktors.class).createUnmarshaller().unmarshal(new StringReader(xml));
        System.out.println(object);
    }

    @XmlRootElement(name = "Konduktors")
    static class Konduktors {
        private List<Konductor> konductors = new ArrayList<Konductor>();

        @XmlElement(name = "Konduktor")
        public List<Konductor> getKonductors() {
            return konductors;
        }

        public void setKonductors(List<Konductor> konductors) {
            this.konductors = konductors;
        }

        @Override
        public String toString() {
            return "Konductors{" +
                    "konductors=" + konductors +
                    '}';
        }
    }

    static class Konductor {
        private int id;
        private String linie;
        private String endstation;
        private String zeit;

        public int getId() {
            return id;
        }

        public void setId(int id) {
            this.id = id;
        }

        public String getLinie() {
            return linie;
        }

        public void setLinie(String linie) {
            this.linie = linie;
        }

        public String getEndstation() {
            return endstation;
        }

        public void setEndstation(String endstation) {
            this.endstation = endstation;
        }

        public String getZeit() {
            return zeit;
        }

        public void setZeit(String zeit) {
            this.zeit = zeit;
        }

        @Override
        public String toString() {
            return "Konductor{" +
                    "id=" + id +
                    ", linie='" + linie + '\'' +
                    ", endstation='" + endstation + '\'' +
                    ", zeit='" + zeit + '\'' +
                    '}';
        }
    }
}

其他选项包括 XStream 或 XMLBeans 用于更高级别的抽象，dom4j 或 JDOM 用于较低级别的抽象——您必须在这些方面做更多的工作，但具有更大的灵活性。