XStream 基本用法

摘自https://www.cnblogs.com/LiZhiW/p/4313493.html

基本使用

<!-- https://mvnrepository.com/artifact/com.thoughtworks.xstream/xstream -->
        <dependency>
            <groupId>com.thoughtworks.xstream</groupId>
            <artifactId>xstream</artifactId>
            <version>1.4.10</version>
        </dependency>

   //XStream xstream = new XStream();//需要XPP3库
        //XStream xstream = new XStream(new DomDriver());//不需要XPP3库
        XStream xstream = new XStream(new StaxDriver());//不需要XPP3库开始使用Java6 
        //XML序列化
        String xml = xstream.toXML(bean);
        System.out.println(xml);
        //XML反序列化
        bean=(Person)xstream.fromXML(xml);
        System.out.println(bean);

        xstream.alias("人",Person.class);//为类名节点重命名
        xstream.aliasPackage("com.lzw", "test");//为包名称重命名
        xstream.aliasField("姓名", Person.class,"name");//为类的字段节点重命名
        
        <test.Person>   
          <姓名>张三</姓名>
          <年龄>19</年龄>
        </test.Person>


 xstream.addImplicitCollection(Person.class, "friends");//省略集合根节点
        <test.Person>
          <name>张三</name>
          <age>19</age>
          （+）<string>李四</string>
          <string>王五</string>
          <string>赵六</string>
        </test.Person>

xstream.useAttributeFor(Person.class, "name");//把字段节点设置成属性
          <test.Person name="张三">
          <age>19</age>
          <friends class="java.util.Arrays$ArrayList">
            <a class="string-array">
              <string>李四</string>
              <string>王五</string>
              <string>赵六</string>
            </a>
          </friends>
    </test.Person>
Person [name=张三, age=19, friends=[李四, 王五, 赵六]]

xstream.omitField(Person.class, "friends");//把字段节点隐藏

使用注解

XStream xstream = new XStream();
xstream.processAnnotations(Person.class);//应用Person类的注解
xstream.autodetectAnnotations(true);//自动检测注解

重命名：@XStreamAlias() 
省略集合根节点：@XStreamImplicit  
把字段节点设置成属性：@XStreamAsAttribute  
隐藏字段：@XStreamOmitField
设置转换器：@XStreamConverter()
    

其他用法

 ## 流
    XStream xstream = new XStream();
        ObjectOutputStream out = xstream.createObjectOutputStream(System.out);
        out.writeObject(new Person("张三",12));
        out.writeObject(new Person("李四",19));
        out.writeObject("Hello");
        out.writeInt(12345);
        out.close();
        
        
        
        String s="<object-stream><test.Person><name>张三</name><age>12</age></test.Person><int>12345</int></object-stream>";
        StringReader reader = new StringReader(s);
        XStream xstream = new XStream();
        ObjectInputStream in = xstream.createObjectInputStream(reader);
        System.out.println((Person) in.readObject());
        System.out.println(in.readInt());
        
## 持久化
PersistenceStrategy strategy = new FilePersistenceStrategy(new File("D:\\tmp"));
        List list = new XmlArrayList(strategy);
        list.add(new Person("张三",13));//保存数据
        list.add(new Person("李四",21));
        list.add(new Person("王五",17));
        
PersistenceStrategy strategy = new FilePersistenceStrategy(new File("D:\\tmp"));
        List list = new XmlArrayList(strategy);
        for (Iterator it = list.iterator(); it.hasNext();)
        {
            System.out.println((Person) it.next());
            it.remove();//删除对象序列化文件
        }

自封装类

public class XmlHelper {
            @Data
        @XStreamAlias("XMLInfo")
        public class PrintSyncDto {
            private String merchantCode;
            private String serviceOrderNo;
            private String client;
            private String sercet;
            private String nonceStr;
            private String signature;
            private PrintData printData;

            @Data
            public static class PrintData {
                private String useSenderInfo;
                private String bigAccountDataId;
                private String businessType;
            }

        }
    

    public static void main(String[] args) {


        XStream xstream = getXStream();
        PrintSyncDto printSyncDto = new PrintSyncDto();
        printSyncDto.setMerchantCode("1");
        printSyncDto.setServiceOrderNo("2");
        printSyncDto.setClient("3");
        printSyncDto.setSercet("4");
        printSyncDto.setNonceStr("5");
        printSyncDto.setSignature("6");
        PrintSyncDto.PrintData printData = new PrintSyncDto.PrintData();
        printData.setUseSenderInfo("7");
        printData.setBigAccountDataId("8");
        printData.setBusinessType("9");
        printSyncDto.setPrintData(printData);
        String xml = xstream.toXML(printSyncDto);
        System.out.println(xml);
        String json = "";
        System.out.println(json = XmlHelper.xmlToJson(xml, xstream));
        System.out.println((XmlHelper.jsonStrToXml(json, PrintSyncDto.class, xstream)));
//        System.out.println(JSON.toJSONString(xstream.fromXML(xml)));
    }

    public static final XStream getXStream() {
        XStream xstream = new XStream(new StaxDriver());
        xstream.autodetectAnnotations(true);//自动检测注解
        return xstream;
    }

    public static final String xmlToJson(String xml, XStream xstream) {
        Object o = xstream.fromXML(xml);
        return JSON.toJSONString(o);
    }

    public static final <T> String jsonToXml(JSONObject jo, Class<T> clazz, XStream xstream) {
        return xstream.toXML(JSON.toJavaObject(jo, clazz));
    }

    public static final <T> String jsonStrToXml(String json, Class<T> clazz, XStream xstream) {
        return xstream.toXML(JSON.parseObject(json, clazz));
    }
}