XStream转换Java对象与XML

1.引入需要的jar包，在pom.xml中配置依赖 

<dependency>
    <groupId>com.thoughtworks.xstream</groupId>
    <artifactId>xstream</artifactId>
    <version>1.4.2</version>
</dependency>

2.创建要转换的实例类，本文以简单的硬件信息为例 

package com.ajita.xstream;

import com.thoughtworks.xstream.annotations.XStreamAlias;
import com.thoughtworks.xstream.annotations.XStreamAsAttribute;

@XStreamAlias("DiskInfo")
public class DiskInfo {
    @XStreamAsAttribute
    @XStreamAlias("diskName")
    private String name;
    private int totalSize;
    private int avilableSize;
    private int usedSize;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getTotleSize() {
        return totalSize;
    }

    public void setTotleSize(int totleSize) {
        this.totalSize = totleSize;
    }

    public int getAvilableSize() {
        return avilableSize;
    }

    public void setAvilableSize(int avilableSize) {
        this.avilableSize = avilableSize;
    }

    public int getUserSize() {
        return usedSize;
    }

    public void setUserSize(int userSize) {
        this.usedSize = userSize;
    }

    public String toString() {
        StringBuilder sb = new StringBuilder();
        sb.append(name + "\r\n");
        sb.append("TotalSize:" + totalSize + "|Used Size:" + usedSize
                + "|Available Size:" + avilableSize);
        return sb.toString();
    }
}

package com.ajita.xstream;

import java.util.List;

import com.thoughtworks.xstream.annotations.XStreamAlias;

@XStreamAlias("HardwareInfo")
public class HardwareInfo {
    private String cpuInfo;
    private String networkInfo;
    private List<DiskInfo> diskInfos;

    public String getCpuInfo() {
        return cpuInfo;
    }

    public void setCpuInfo(String cpuInfo) {
        this.cpuInfo = cpuInfo;
    }

    public String getNetworkInfo() {
        return networkInfo;
    }

    public void setNetworkInfo(String networkInfo) {
        this.networkInfo = networkInfo;
    }

    public List<DiskInfo> getDiskInfos() {
        return diskInfos;
    }

    public void setDiskInfos(List<DiskInfo> diskInfos) {
        this.diskInfos = diskInfos;
    }

    public String toString() {
        StringBuilder sb = new StringBuilder();
        sb.append(cpuInfo);
        sb.append("\r\n");
        sb.append(networkInfo);
        sb.append("\r\n");
        for (DiskInfo disk : diskInfos) {
            sb.append(disk.toString());
            sb.append("\r\n");
        }
        return sb.toString();
    }
}

3.新建测试代码 

package com.ajita.xstream;

import java.util.ArrayList;

import com.thoughtworks.xstream.XStream;

public class TestXStream {
    /**
     * @param args
     */
    public static void main(String[] args) {
        DiskInfo disk1 = new DiskInfo();
        disk1.setName("D:\\");
        disk1.setTotleSize(100);
        disk1.setUserSize(20);
        disk1.setAvilableSize(80);
        DiskInfo disk2 = new DiskInfo();
        disk2.setName("E:\\");
        disk2.setTotleSize(200);
        disk2.setUserSize(40);
        disk2.setAvilableSize(160);

        ArrayList<DiskInfo> diskInfos = new ArrayList<DiskInfo>();
        diskInfos.add(disk1);
        diskInfos.add(disk2);

        HardwareInfo hwInfo = new HardwareInfo();
        hwInfo.setCpuInfo("cpu info is ...");
        hwInfo.setNetworkInfo("network info is ...");
        hwInfo.setDiskInfos(diskInfos);

        XStream xStream = new XStream();
        xStream.autodetectAnnotations(true);
        String xml = xStream.toXML(hwInfo);
        System.out.println(xml);

        HardwareInfo info2 = (HardwareInfo) xStream.fromXML(xml);
        System.out.println(info2);
    }

}

输出如下： 

<HardwareInfo>
  <cpuInfo>cpu info is ...</cpuInfo>
  <networkInfo>network info is ...</networkInfo>
  <diskInfos>
    <DiskInfo diskName="D:\">
      <totalSize>100</totalSize>
      <avilableSize>80</avilableSize>
      <usedSize>20</usedSize>
    </DiskInfo>
    <DiskInfo diskName="E:\">
      <totalSize>200</totalSize>
      <avilableSize>160</avilableSize>
      <usedSize>40</usedSize>
    </DiskInfo>
  </diskInfos>
</HardwareInfo>
cpu info is ...
network info is ...
D:\
TotalSize:100|Used Size:20|Available Size:80
E:\
TotalSize:200|Used Size:40|Available Size:160

4.常用XStream注解 
1）@XStreamAlias注解可在类与属性上使用设置名称,相当于: xstream.alias("blog", Blog.class); 
2）@XStreamImplicit去集合节点名:相当于 xstream.addImplicitCollection(Blog.class, "entries"); 
3） @XStreamConverter(SingleValueCalendarConverter.class) 
    private Calendar createdTime = new GregorianCalendar();