XStream--java对象与xml形式文件相互转换

Posted 2020-10-24 生根

1.pom.xml中添加依赖

<dependency>
            <groupId>com.thoughtworks.xstream</groupId>
            <artifactId>xstream</artifactId>
            <version>1.4.7</version>
        </dependency>

2.创建xmlUtil类,并对XStream配置

　　2.1 解决双下划线:XStream把对象中的属性如person_name转成xml格式时会出现<person__name>,这种双下划线

　　　　此时用这种方式可以将双下划线代替成单下划线

//解决双下划线
    public static final XmlFriendlyNameCoder nameCoder = new XmlFriendlyNameCoder("-_", "_");

　　2.2 编码格式:

// 编码格式
    private static final String ENCODING = "UTF-8";

　　2.3 使用dom解析方式

 // dom解析驱动
    private static final DomDriver fixDriver = new DomDriver(ENCODING, nameCoder);

　　2.4 通用解析器,把配置都放到XStream对象中

 // 通用解析器
    public static final XStream XSTREAM = new XStream(fixDriver);

　　2.5 对象中有日期注意时区处理

//时区
    private static final String CHINA_TIME_ZONE = "Asia/Shanghai";

　　2.6 初始化XStream

 static {
        // 时区处理
        TimeZone zone = TimeZone.getTimeZone(CHINA_TIME_ZONE); //获得时区
        XSTREAM.registerConverter(new DateConverter(zone), XStream.PRIORITY_NORMAL);
        XSTREAM.autodetectAnnotations(true); //开启序列化的注解形式
        XSTREAM.setMode(XStream.NO_REFERENCES);//取消引用,如果没有这一步,会出现xml引用格式reference

    }

3. XStream的方法

　　3.1 报文转对象

public static Object fromXML(String xml) {
        Object target = null;
        XStream xstream = XSTREAM;
        xstream.processAnnotations(AllCase.class);//开启此类的解析,否则无法解析
        try {
            target = xstream.fromXML(xml);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return target;
    }

　　3.2 对象转报文

public static String toXML(Object obj) {
        XStream xstream = XSTREAM;
        String xml= xstream.toXML(obj);
        return xml;
    }

　　3.3 文件流转对象

public static Object fromXML(InputStream in) {
        Object target = null;
        XStream xstream = XSTREAM;
        xstream.processAnnotations(AllCase.class);
        try {
            target =  xstream.fromXML(in);
            System.out.println("输入成功");
        } catch (Exception e) {
            e.printStackTrace();
        }
        return target;
    }

　　3.4对象转文件流

　　

 public static void toXML(Object obj, OutputStream out) {
        XStream xstream = XSTREAM;
        xstream.toXML(obj,out);
        System.out.println("输出成功");
    }

PS:XStream将java对象与xml之间序列化与反序列化,XStream自己封装了序列化方法,java类不用实现Serializable接口