JAXB介绍二

链接上一遍 JAXB介绍一 , 本节主要介绍解析xml的步骤, 下面的例子是在实际项目中运用的, 把它拿出来单独写一个java运行程序.

5. 测试实例

先给出我的代码结构图:

再给出要解析的Script.xml文件的内容:

<?xml version='1.0' encoding='UTF-8' ?>
<Script>
  <SchemaVersion MajorVerNo="1" MinorVerNo="0" />
    <Activity>
        <Action>ReinstallTV</Action>
    </Activity>
    <Activity>
        <Action>TuneChannel</Action>
        <Priority>1</Priority>
        <Attributes>
            <ChannelNumber>340</ChannelNumber>
        </Attributes>
    </Activity>
</Script>

下面进入正题:

1. 给出Script.java的代码, 其实就是对Script.xml的类似Bean构建:

package com.demo.util;
 
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;
import javax.xml.bind.annotation.XmlType;
 
@XmlRootElement(name = "Script")
@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(propOrder = {"schemaVersion","activities"})
public class Script {
 
    @XmlElement(name = "SchemaVersion", required = false)
    private SchemaVersion schemaVersion;
 
    @XmlElement(name = "Activity", required = false)
    private List<Activity> activities;
 
    public SchemaVersion getSchemaVersion() {
        return schemaVersion;
    }
 
    public void setSchemaVersion(SchemaVersion schemaVersion) {
        this.schemaVersion = schemaVersion;
    }
 
    public List<Activity> getActivity() {
        return activities;
    }
 
    public void setActivity(List<Activity> activities) {
        this.activities = activities;
    }
 
}

2. 给出SchemaVersion.java的代码:

package com.demo.util;
 
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlType;
 
@XmlRootElement(name = "SchemaVersion")
@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(propOrder = {"majorVerNo","minorVerNo"})
public class SchemaVersion {
 
    @XmlAttribute(name = "MajorVerNo", required = false)
    protected String majorVerNo;
 
    @XmlAttribute(name = "MinorVerNo", required = false)
    protected String minorVerNo;
 
    public String getMajorVerNo() {
        return majorVerNo;
    }
 
    public void setMajorVerNo(String majorVerNo) {
        this.majorVerNo = majorVerNo;
    }
 
    public String getMinorVerNo() {
        return minorVerNo;
    }
 
    public void setMinorVerNo(String minorVerNo) {
        this.minorVerNo = minorVerNo;
    }
 
}

3. 给出Activity.java的代码结构:

package com.demo.util;
 
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlType;
 
@XmlRootElement(name = "Activity")
@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(propOrder = {"action","priority","attributes"})
public class Activity {
 
    @XmlElement(name = "Action", required = false)
    protected String action;
 
    @XmlElement(name = "Priority", required = false)
    protected String priority;
 
    @XmlElement(name = "Attributes", required = false)
    protected Attributes attributes;
 
    public String getAction() {
        return action;
    }
 
    public void setAction(String action) {
        this.action = action;
    }
 
    public String getPriority() {
        return priority;
    }
 
    public void setPriority(String priority) {
        this.priority = priority;
    }
 
    public Attributes getAttributes() {
        return attributes;
    }
 
    public void setAttributes(Attributes attributes) {
        this.attributes = attributes;
    }
}

4. 给出Attributes.java的代码:

package com.demo.util;
 
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlType;
 
@XmlRootElement(name = "Attributes")
@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(propOrder = {"channelNumber"})
public class Attributes {
 
    @XmlElement(name = "ChannelNumber", required = false)
    protected String channelNumber;
 
    public String getChannelNumber() {
        return channelNumber;
    }
 
    public void setChannelNumber(String channelNumber) {
        this.channelNumber = channelNumber;
    }
 
}

5. 给出Test.java对Script.xml处理的代码:

package com.demo.test;
 
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.util.List;
 
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Unmarshaller;
 
import com.demo.util.Activity;
import com.demo.util.Script;
 
public class Test {
 
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        
　　     // Script.xml路径可以随时改变
        String SCRIPT_XML_PATH = "C:/Script/Script.xml";
        try {
            File file = new File(SCRIPT_XML_PATH);
            JAXBContext jaxbContext = JAXBContext.newInstance(Script.class);
            Unmarshaller unmarshaller = jaxbContext.createUnmarshaller();
            Script script = (Script) unmarshaller.unmarshal(file);
            System.out.println("SchemaVersion=>MajorVerNo="+script.getSchemaVersion().getMajorVerNo());
            System.out.println("SchemaVersion=>MinorVerNo="+script.getSchemaVersion().getMinorVerNo());
            boolean hasReinstallTvCommand = false;
            if (script != null) {
                List<Activity> activities = script.getActivity();
                int activitySize = activities.size();
                if (activitySize > 0) {
                    for(Activity activity : activities) {
                        System.out.println("Activity:");
                        if (activity.getAction() != null) {
                            System.out.println("   Action="+activity.getAction());
                            if ("ReinstallTV".equalsIgnoreCase(activity.getAction())) {
                                hasReinstallTvCommand = true;
                                //break;
                            }
                        }
                        if (activity.getPriority() != null) {
                            System.out.println("   Priority="+activity.getPriority());
                        }
                        if (activity.getAttributes() != null) {
                            if (activity.getAttributes().getChannelNumber() != null) {
                                System.out.println("   ChannelNumber="+activity.getAttributes().getChannelNumber());
                            }
                        }
                    }
                }
            }
            System.out.println("hasReinstallTvCommand="+hasReinstallTvCommand);
 
        } catch (JAXBException e) {
            System.out.println("e="+e.getMessage());
        }

6. 给出最后Test.java运行的代码, 打印出的log:

SchemaVersion=>MajorVerNo=1
SchemaVersion=>MinorVerNo=0
Activity:
   Action=ReinstallTV
Activity:
   Action=TuneChannel
   Priority=1
   ChannelNumber=340
hasReinstallTvCommand=true

待续...