Java 如何使用ApacheCommons解析xml中的配置文件？

我正在使用ApacheCommonsConfiguration 1.10来管理xml配置。这是xml格式的配置文件

<?xml version="1.0" encoding="ISO-8859-1" ?>
<config>
    <mainServerHostname>MainServer</mainServerHostname>
    <failoverServers>
        <server>
            <ipAddress>192.168.0.5</ipAddress>
            <priority>1</priority>
        </server>
        <server>
            <ipAddress>192.168.0.6</ipAddress>
            <priority>2</priority>
        </server>
    </failoverServers>
</config>

这是我写的代码片段

public void loadXmlFile(String filename) {
    XMLConfiguration config = null;
    try {
        config = new XMLConfiguration(filename);
    } catch (ConfigurationException e) {
        e.printStackTrace();
    }
    List<HierarchicalConfiguration> fields= config. configurationsAt("failoverServers");
    for (Iterator it = fields.iterator(); it.hasNext();) {
        HierarchicalConfiguration sub = (HierarchicalConfiguration) it
                .next();
        Iterator<String> keyIter = sub.getKeys();
        String key, value;
        while (keyIter.hasNext()) {
            key = keyIter.next();
            value = sub.getString(key);
            System.out.println("Key:: " + key + " Val:: " + value);
        }
    }

}

---

有谁能帮助我如何获得所需的输出吗？

如果您对apache commons配置有特殊要求，可以这样做

public void loadXmlFile(String filename) {
    XMLConfiguration config = null;
    try {
        config = new XMLConfiguration(filename);
    } catch (ConfigurationException e) {
        e.printStackTrace();
    }
    Iterator<String> keyIter = config.getKeys();
    String key;
    while (keyIter.hasNext()) {
        key = keyIter.next();
        Object prop = config.getProperty(key);
        if(prop instanceof Collection) {
                List<String> values = (List<String>) prop;
                for(String value : values){
                    System.out.println(key + "=" + value);
                }
        } else {
            System.out.println(key + "=" + prop);
        }
    }
}

或者您可以使用一个StAX解析器来实现这一点

import java.io.FileInputStream;
import java.util.ArrayList;
import java.util.List;

import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLStreamConstants;
import javax.xml.stream.XMLStreamReader;

import org.apache.commons.lang3.StringUtils;


public class ConfigParser {

    public static void main(String[] args) throws Exception {
        StringBuilder content = null;
        List<String> parents = new ArrayList<>();
        XMLInputFactory factory = XMLInputFactory.newInstance();
        XMLStreamReader reader = 
        factory.createXMLStreamReader(new FileInputStream("prop.xml"));

        while(reader.hasNext()){
          int event = reader.next();

          switch(event){
        case XMLStreamConstants.START_ELEMENT: 
            content = new StringBuilder();
            if(!"config".equalsIgnoreCase(reader.getLocalName())) {
                parents.add(reader.getLocalName());
            }
            break;

        case XMLStreamConstants.CHARACTERS:
            if (content != null) {
                    content.append(reader.getText().trim());
                }
            break;

        case XMLStreamConstants.END_ELEMENT:
            if (content != null) {
                    System.out.println(StringUtils.join(parents, '.') + "=" + content.toString());
                }
            parents.remove(reader.getLocalName());
                content = null;
                break;

        case XMLStreamConstants.START_DOCUMENT:
          break;
          }

        }
    }

}

import java.io.FileInputStream；
导入java.util.ArrayList；
导入java.util.List；
导入javax.xml.stream.XMLInputFactory；
导入javax.xml.stream.XMLStreamConstants；
导入javax.xml.stream.XMLStreamReader；
导入org.apache.commons.lang3.StringUtils；
公共类配置分析器{
公共静态void main（字符串[]args）引发异常{
StringBuilder内容=null；
List parents=new ArrayList（）；
XMLInputFactory=XMLInputFactory.newInstance（）；
XMLStreamReader读取器=
createXMLStreamReader（新文件输入流（“prop.xml”）；
while（reader.hasNext（））{
int event=reader.next（）；
开关（事件）{
案例XMLStreamConstants.START_元素：
内容=新的StringBuilder（）；
if（！“config”.equalsIgnoreCase（reader.getLocalName（）））{
add（reader.getLocalName（））；
}
打破
大小写XMLStreamConstants.CHARACTERS：
如果（内容！=null）{
append（reader.getText（）.trim（））；
}
打破
案例XMLStreamConstants.END_元素：
如果（内容！=null）{
System.out.println（StringUtils.join（parents，'..'）+“=”+content.toString（））；
}
remove（reader.getLocalName（））；
内容=空；
打破
案例XMLStreamConstants.START_文档：
打破
}
}
}
}

您首先使用的是哪个Apache Commons库？

public void loadXmlFile(String filename) {
    XMLConfiguration config = null;
    try {
        config = new XMLConfiguration(filename);
    } catch (ConfigurationException e) {
        e.printStackTrace();
    }
    Iterator<String> keyIter = config.getKeys();
    String key;
    while (keyIter.hasNext()) {
        key = keyIter.next();
        Object prop = config.getProperty(key);
        if(prop instanceof Collection) {
                List<String> values = (List<String>) prop;
                for(String value : values){
                    System.out.println(key + "=" + value);
                }
        } else {
            System.out.println(key + "=" + prop);
        }
    }
}

mainServerHostname=MainServer
failoverServers.server.ipAddress=192.168.0.5
failoverServers.server.ipAddress=192.168.0.6
failoverServers.server.priority=1
failoverServers.server.priority=2

import java.io.FileInputStream;
import java.util.ArrayList;
import java.util.List;

import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLStreamConstants;
import javax.xml.stream.XMLStreamReader;

import org.apache.commons.lang3.StringUtils;


public class ConfigParser {

    public static void main(String[] args) throws Exception {
        StringBuilder content = null;
        List<String> parents = new ArrayList<>();
        XMLInputFactory factory = XMLInputFactory.newInstance();
        XMLStreamReader reader = 
        factory.createXMLStreamReader(new FileInputStream("prop.xml"));

        while(reader.hasNext()){
          int event = reader.next();

          switch(event){
        case XMLStreamConstants.START_ELEMENT: 
            content = new StringBuilder();
            if(!"config".equalsIgnoreCase(reader.getLocalName())) {
                parents.add(reader.getLocalName());
            }
            break;

        case XMLStreamConstants.CHARACTERS:
            if (content != null) {
                    content.append(reader.getText().trim());
                }
            break;

        case XMLStreamConstants.END_ELEMENT:
            if (content != null) {
                    System.out.println(StringUtils.join(parents, '.') + "=" + content.toString());
                }
            parents.remove(reader.getLocalName());
                content = null;
                break;

        case XMLStreamConstants.START_DOCUMENT:
          break;
          }

        }
    }

}