XStream转换Java对象与XML

1.引入需要的jar包，在pom.xml中配置依赖

1. <dependency>
2. <groupId>com.thoughtworks.xstream</groupId>
3. <artifactId>xstream</artifactId>
4. <version>1.4.2</version>
5. </dependency>

2.创建要转换的实例类，本文以简单的硬件信息为例

1. package com.ajita.xstream;
2. import com.thoughtworks.xstream.annotations.XStreamAlias;
3. import com.thoughtworks.xstream.annotations.XStreamAsAttribute;
4. @XStreamAlias("DiskInfo")
5. public class DiskInfo {
6. @XStreamAsAttribute
7. @XStreamAlias("diskName")
8. private String name;
9. private int totalSize;
10. private int avilableSize;
11. private int usedSize;
12. public String getName() {
13. return name;
14. }
15. public void setName(String name) {
16. this.name = name;
17. }
18. public int getTotleSize() {
19. return totalSize;
20. }
21. public void setTotleSize(int totleSize) {
22. this.totalSize = totleSize;
23. }
24. public int getAvilableSize() {
25. return avilableSize;
26. }
27. public void setAvilableSize(int avilableSize) {
28. this.avilableSize = avilableSize;
29. }
30. public int getUserSize() {
31. return usedSize;
32. }
33. public void setUserSize(int userSize) {
34. this.usedSize = userSize;
35. }
36. public String toString() {
37. StringBuilder sb = new StringBuilder();
38. sb.append(name + "\r\n");
39. sb.append("TotalSize:" + totalSize + "|Used Size:" + usedSize
40. + "|Available Size:" + avilableSize);
41. return sb.toString();
42. }
43. }
44. package com.ajita.xstream;
45. import java.util.List;
46. import com.thoughtworks.xstream.annotations.XStreamAlias;
47. @XStreamAlias("HardwareInfo")
48. public class HardwareInfo {
49. private String cpuInfo;
50. private String networkInfo;
51. private List<DiskInfo> diskInfos;
52. public String getCpuInfo() {
53. return cpuInfo;
54. }
55. public void setCpuInfo(String cpuInfo) {
56. this.cpuInfo = cpuInfo;
57. }
58. public String getNetworkInfo() {
59. return networkInfo;
60. }
61. public void setNetworkInfo(String networkInfo) {
62. this.networkInfo = networkInfo;
63. }
64. public List<DiskInfo> getDiskInfos() {
65. return diskInfos;
66. }
67. public void setDiskInfos(List<DiskInfo> diskInfos) {
68. this.diskInfos = diskInfos;
69. }
70. public String toString() {
71. StringBuilder sb = new StringBuilder();
72. sb.append(cpuInfo);
73. sb.append("\r\n");
74. sb.append(networkInfo);
75. sb.append("\r\n");
76. for (DiskInfo disk : diskInfos) {
77. sb.append(disk.toString());
78. sb.append("\r\n");
79. }
80. return sb.toString();
81. }
82. }

3.新建测试代码

1. package com.ajita.xstream;
2. import java.util.ArrayList;
3. import com.thoughtworks.xstream.XStream;
4. public class TestXStream {
5. /**
6. * @param args
7. */
8. public static void main(String[] args) {
9. DiskInfo disk1 = new DiskInfo();
10. disk1.setName("D:\\");
11. disk1.setTotleSize(100);
12. disk1.setUserSize(20);
13. disk1.setAvilableSize(80);
14. DiskInfo disk2 = new DiskInfo();
15. disk2.setName("E:\\");
16. disk2.setTotleSize(200);
17. disk2.setUserSize(40);
18. disk2.setAvilableSize(160);
19. ArrayList<DiskInfo> diskInfos = new ArrayList<DiskInfo>();
20. diskInfos.add(disk1);
21. diskInfos.add(disk2);
22. HardwareInfo hwInfo = new HardwareInfo();
23. hwInfo.setCpuInfo("cpu info is ...");
24. hwInfo.setNetworkInfo("network info is ...");
25. hwInfo.setDiskInfos(diskInfos);
26. XStream xStream = new XStream();
27. xStream.autodetectAnnotations(true);
28. String xml = xStream.toXML(hwInfo);
29. System.out.println(xml);
30. HardwareInfo info2 = (HardwareInfo) xStream.fromXML(xml);
31. System.out.println(info2);
32. }
33. }

输出如下：

1. <HardwareInfo>
2. <cpuInfo>cpu info is ...</cpuInfo>
3. <networkInfo>network info is ...</networkInfo>
4. <diskInfos>
5. <DiskInfo diskName="D:\">
6. <totalSize>100</totalSize>
7. <avilableSize>80</avilableSize>
8. <usedSize>20</usedSize>
9. </DiskInfo>
10. <DiskInfo diskName="E:\">
11. <totalSize>200</totalSize>
12. <avilableSize>160</avilableSize>
13. <usedSize>40</usedSize>
14. </DiskInfo>
15. </diskInfos>
16. </HardwareInfo>
17. cpu info is ...
18. network info is ...
19. D:\
20. TotalSize:100|Used Size:20|Available Size:80
21. E:\
22. 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();