java读取XML文件内容的方法

xml文件内容：
<?xml version="1.0" encoding="UTF-8"?>

<DigitalEnvelope>

    <Channel id="BANK" privatekey="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"
pwd="12342231"></Channel>

</DigitalEnvelope>



实体类：

import java.util.List;

import javax.xml.bind.annotation.XmlAccessType;

import javax.xml.bind.annotation.XmlAccessorType;

import javax.xml.bind.annotation.XmlElement;

import javax.xml.bind.annotation.XmlRootElement;

@XmlRootElement(name="DigitalEnvelope")

@XmlAccessorType(XmlAccessType.FIELD)

public class DigitalEnvelopeDefinition {

    

    @XmlElement(name="Channel")

    private List<ChannelDefinition> channels;

    public List<ChannelDefinition> getChannels() {

        return channels;

    }

    public void setChannels(List<ChannelDefinition> channels) {

        this.channels = channels;

    }

}

import javax.xml.bind.annotation.XmlAccessType;

import javax.xml.bind.annotation.XmlAccessorType;

import javax.xml.bind.annotation.XmlAttribute;

import javax.xml.bind.annotation.XmlRootElement;

@XmlRootElement(name="Channel")

@XmlAccessorType(XmlAccessType.FIELD)

public class ChannelDefinition {

    @XmlAttribute(name="id")

    private String id;

    

    @XmlAttribute(name="privatekey")

    private String privatekey;

    

    @XmlAttribute(name="pwd")

    private String pwd;

    public String getId() {

        return id;

    }

    public void setId(String id) {

        this.id = id;

    }

    public String getPrivatekey() {

        return privatekey;

    }

    public void setPrivatekey(String privatekey) {

        this.privatekey = privatekey;

    }

    public void setPwd(String pwd) {

        this.pwd = pwd;

    }

    public String getPwd() {

        return pwd;

    }

    

}

测试类：

import java.io.File;

import java.io.IOException;

import java.net.URL;

import java.net.URLConnection;

import javax.xml.bind.JAXBContext;

import javax.xml.bind.Unmarshaller;

public class readXML {

    public static void main(String[] args) throws Exception {

     

        URL url=DigitalEnvelopeDefinition.class.getClassLoader().getResource("DigitalEnvelopeCfg.xml");

        if(url == null) {

            throw new IOException("文件--未找到");

        }

        URLConnection conn;

        try {

            conn = url.openConnection();

            File file = new File(conn.getURL().toURI());

            JAXBContext context = JAXBContext.newInstance(DigitalEnvelopeDefinition.class);

            Unmarshaller unmarshaller = context.createUnmarshaller();

            DigitalEnvelopeDefinition unmarshal = (DigitalEnvelopeDefinition) unmarshaller.unmarshal(file);

            for(int i=0; i<unmarshal.getChannels().size();i++){

                System.out.println(unmarshal.getChannels().get(i).getId());

                System.out.println(unmarshal.getChannels().get(i).getPrivatekey());

                System.out.println(unmarshal.getChannels().get(i).getPwd());

            }

        } catch (IOException e) {

            e.printStackTrace();

        }

    }

    

    

}