xml与java对象转换 -- XStreamAlias

 

@XStreamAlias使用

一、 特点:

简化的API; 
无映射文件; 
高性能,低内存占用; 
整洁的XML; 
不需要修改对象;支持内部私有字段,不需要setter/getter方法 
提供序列化接口; 
自定义转换类型策略; 

XStream的优点很多，但是也有一些小bug，比如在定义别名中的下划线“_”转换为xml后会变成“__”这个符号， 不过下划线问题可以用下面这个解决

 XStream xStream = new XStream(new XppDriver(new XmlFriendlyNameCoder("_-", "_")));

二、 使用场景

Transport转换 
Persistence 持久化对象 
Configuration 配置 
Unit Tests 单元测试

Interface服务之间XML消息的交互

 

案例代码：

@XStreamAlias("kfpt_dept") //注意这个，后面变成了<kfpt__dept>  下划线。。。。
class Dept {private String deptName;private List<Staff> staffs;public String getDeptName() {return deptName;}public void setDeptName(String deptName) {this.deptName = deptName;}public List<Staff> getStaffs() {return staffs;}public void setStaffs(List<Staff> staffs) {this.staffs = staffs;}@Overridepublic String toString() {return ToStringBuilder.reflectionToString(this, ToStringStyle.MULTI_LINE_STYLE);}
}@XStreamAlias("kfpt_staffs")
class Staff {private String name;private int age;public Staff() {super();}public Staff(String name, int age) {super();this.name = name;this.age = age;}public String getName() {return name;}public void setName(String name) {this.name = name;}public int getAge() {return age;}public void setAge(int age) {this.age = age;}@Overridepublic String toString() {return ToStringBuilder.reflectionToString(this, ToStringStyle.MULTI_LINE_STYLE);}}

 

转换工具类：

public class XstreamUtil {/*** 将bean转换为xml* @param obj 转换的bean* @return bean转换为xml*/public static String objectToXml(Object obj) {//  XStream xStream = new XStream();
 XStream xStream = new XStream(new XppDriver(new XmlFriendlyNameCoder("_-", "_")));//解决下划线问题//xstream使用注解转换
       xStream.processAnnotations(obj.getClass());return xStream.toXML(obj);}/*** 将xml转换为bean* @param <T> 泛型* @param xml 要转换为bean的xml* @param cls bean对应的Class* @return xml转换为bean*/public static <T> T xmlToObject(String xml, Class<T> cls){XStream xstream = new XStream(new DomDriver());//xstream使用注解转换
        xstream.processAnnotations(cls);return (T) xstream.fromXML(xml);}
}

 

main方法测试

public static void main(String[] args) {//java bean 转 xmlDept d = new Dept();List<Staff> staffs = new ArrayList<>();Staff s1 = new Staff("wuyun", 20);Staff s2 = new Staff("lilei", 22);staffs.add(s1);staffs.add(s2);d.setDeptName("开放平台");d.setStaffs(staffs);System.out.println(objectToXml(d));
/*

 用这个方法 XStream xStream = new XStream(); 会有下划线问题

<kfpt__dept>
<deptName>开放平台</deptName>
<staffs>
<kfpt__staffs>
<name>wuyun</name>
<age>20</age>
</kfpt__staffs>
<kfpt__staffs>
<name>lilei</name>
<age>22</age>
</kfpt__staffs>
</staffs>
</kfpt__dept>

 

XStream xStream = new XStream(new XppDriver(new XmlFriendlyNameCoder("_-", "_")));//可以解决下划线问题

<kfpt_dept>
<deptName>开放平台</deptName>
<staffs>
<kfpt_staffs>
<name>wuyun</name>
<age>20</age>
</kfpt_staffs>
<kfpt_staffs>
<name>lilei</name>
<age>22</age>
</kfpt_staffs>
</staffs>
</kfpt_dept>

*///xml 转 java bean // String xml = "<kfpt__dept><deptName>开放平台</deptName><staffs><kfpt__staffs><name>wuyun</name><age>20</age></kfpt__staffs><kfpt__staffs><name>lilei</name><age>22</age></kfpt__staffs></staffs></kfpt__dept>";//        XStream xstream = new XStream(new DomDriver());//        //xstream使用注解转换//        xstream.processAnnotations(Dept.class);//        System.out.println(((Dept) xstream.fromXML(xml)).toString());//        System.out.println(xmlToObject(xml, Dept.class).toString());
/*

com.cmcc.open.ss.vo.req.Dept@5660d2d2[
deptName=开放平台
staffs=[com.cmcc.open.ss.vo.req.Staff@6eb1054b[
name=wuyun
age=20
], com.cmcc.open.ss.vo.req.Staff@27d2b7b3[
name=lilei
age=22
]]
]

*/


}