xstream 解析xml报文

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一、xml一种格式的数据转换为对象

pom.xml引入

<dependency>
<groupId>com.thoughtworks.xstream</groupId>
<artifactId>xstream</artifactId>
<version>1.4.</version>
</dependency>

xml文件模板

<?xml version="1.0" encoding="GBK"?>
<MESSAGE>
<MESSAGEHEAD>
<MESSAGEID/>
<SRC/>
</MESSAGEHEAD>
<MESSAGEBODY>
<TRANLIST>
<TRAN_DATE/>
<TRAN_TIME/>
</TRANLIST>
</MESSAGEBODY>
</MESSAGE>

后台需要创建

1、总类Total

class Total
private static final String headInfo = "<?xml version=\"1.0\" encoding=\"GBK\"?>"; @XStreamAlias("MESSAGEHEAD")
private Head head; @XStreamAlias("MESSAGEBODY")
private Body body;
// getter setter

2、头部信息Head

class Head
@XStreamAlias("MESSAGEID")
private String messageId; @XStreamAlias("SRC")
private String src; // getter settter

3、Body，明细类集合

class Body
@XStreamImplicit(itemFieldName = "TRANLIST")
private List<Detail> detail;

4、Detail明细类

class Detail
@XStreamConverter(value = XStreamDateConverter.class)
@XStreamAsAttribute
@XStreamAlias("TRAN_DATE")
private Date tranDate; @XStreamAlias("TRAN_TIME")
private String tranTime;
// getter setter

需要强调的是： String类型不需要转换，其他的类型都可以通过实现接口SingleValueConverter来实现转换格式，编写一个转换日期Date格式的转换，其他类似

public class XStreamDateConverter implements SingleValueConverter { private final String YMD = "yyyyMMdd"; SimpleDateFormat dateFormat = new SimpleDateFormat(YMD); @Override
public String toString(Object o) {
String result = null;
if (o instanceof Date) {
Date date = (Date) o;
result = dateFormat.format(date);
}
return result;
} @Override
public Object fromString(String s) {
Date date = null;
if (s != null && !"".equals(s)) {
try {
date = dateFormat.parse(s);
} catch (ParseException e) {
e.printStackTrace();
}
}
return date;
} @Override
public boolean canConvert(Class aClass) {
return Date.class == aClass;
}
}

基础工作已经完成，接下来就是将xml转换为对象实体

public static Total transXmlToObject(String xmlBody) {
XStream xStream = new XStream();
xStream.alias("MESSAGE", Total.class);
xStream.alias("MESSAGEHEAD", Head.class);
xStream.alias("MESSAGEBODY", Body.class);
xStream.alias("TRANLIST", Detail.class);
xStream.processAnnotations(new Class[]{Total.class, Head.class, Body.class, Detail.class}); Object object = xStream.fromXML(xmlBody);
Total data = (Total) object;
return data;
}