微信公众号xml数据解析之xstream

Posted 2021-03-30 起岸星辰

XStream是Java类库，用来将对象序列化成XML （JSON）或反序列化为对象。相对于jaxb来说要简单易用些，但是也会消耗更多的时间。下面我们看下如何使用。

一、引入XStream的包

<dependency> <groupId>com.thoughtworks.xstream</groupId> <artifactId>xstream</artifactId> <version>1.4.11.1</version></dependency>

二、将xml转换为Java实体类对象

<xml> <ToUserName><![CDATA[toUser]]></ToUserName> <FromUserName><![CDATA[FromUser]]></FromUserName> <CreateTime>123456789</CreateTime> <MsgType><![CDATA[event]]></MsgType> <Event><![CDATA[CLICK]]></Event> <EventKey><![CDATA[EVENTKEY]]></EventKey></xml>

创建实体类：ClickMenuEvent

import com.thoughtworks.xstream.annotations.XStreamAlias;import lombok.Data;
import java.io.Serializable;
/** * <p> 点击菜单拉取消息时的事件推送 </p> */@Data //这个是lombok的注解，加上后编译的class文件中会自动生成get set相关方法，记得安装lombok插件@XStreamAlias("xml") //定义xml根节点public class ClickMenuEvent implements Serializable {
 //消息类型，event @XStreamAlias("MsgType")//xml中的名称和实体类中名称进行映射 private String msgType;
 //事件类型，CLICK @XStreamAlias("Event") private String event;
 //开发者 微信号 @XStreamAlias("ToUserName") private String toUserName;
 //发送方帐号（一个OpenID） @XStreamAlias("FromUserName") private String fromUserName;
 //消息创建时间 （整型） @XStreamAlias("CreateTime") private String createTime;
 //事件KEY值，与自定义菜单接口中KEY值对应 @XStreamAlias("eventKey") private String EventKey;}

开始解析：

import com.thoughtworks.xstream.XStream;import com.thoughtworks.xstream.io.naming.NoNameCoder;import com.thoughtworks.xstream.io.xml.XppDriver;
public class MyTest {
 public static void main(String[] args) { String xml = "<xml>" + "<ToUserName><![CDATA[toUser]]></ToUserName>" + "<FromUserName><![CDATA[FromUser]]></FromUserName>" + "<CreateTime>123456789</CreateTime>" + "<MsgType><![CDATA[event]]></MsgType>" + "<Event><![CDATA[CLICK]]></Event>" + "<EventKey><![CDATA[EVENTKEY]]></EventKey>" + "</xml>";  XStream xStream = new XStream(new XppDriver(new NoNameCoder())); xStream.processAnnotations(ClickMenuEvent.class); //解决提示 Security framework of XStream not initialized, XStream is probably vulnerable. xStream.allowTypes(new Class[]{ClickMenuEvent.class}); ClickMenuEvent pojo = (ClickMenuEvent) xStream.fromXML(xml); System.out.println(pojo.toString()); } }

三、将Java实体对象转xml

同样使用上面的实体对象ClickMenuEvent

public static void main(String[] args) { XStream xStream = new XStream(new XppDriver(new NoNameCoder())); xStream.processAnnotations(ClickMenuEvent.class); ClickMenuEvent pojo = new ClickMenuEvent(); pojo.setCreateTime("9876543210"); pojo.setEvent("CLICK"); pojo.setEventKey("123456"); pojo.setMsgType("event"); pojo.setFromUserName("张三"); pojo.setToUserName("李四"); String xml = xStream.toXML(pojo); System.out.println(xml);}

转换后的结果

<xml> <MsgType>event</MsgType> <Event>CLICK</Event> <ToUserName>李四</ToUserName> <FromUserName>张三</FromUserName> <CreateTime>9876543210</CreateTime> <eventKey>123456</eventKey></xml>