xstream实现java对象和XML的互相转换
一、XStream简介
1. XStream的功能:Java对象与XML之间进行互相转化。
2. XStream的特点:灵活易用、高性能、整洁的XML、转换策略定制、错误诊断等。
3. XStream使用场景:转换;持久化对象;配置;单元测试。
4. 依赖的包: xstream-[version].jar、xpp3-[version].jar、xmlpull-[version].jar
5. MAVEN中pom.xml文件配置
<dependency>
<groupId>com.thoughtworks.xstream</groupId>
<artifactId>xstream</artifactId>
<version>1.4.9</version>
</dependency>
二、XStream的使用
1. 创建XStream实例
XStream xstream = new XStream();
XStream xstream = new XStream(new DomDriver());
XStream xstream = new XStream(new StaxDriver());
2. 常用方法
xstream.toXML():将对象转换成XML
xstream.fromXML():将XML转换成对象
xstream.alias():为指定类创建别名
xstream.useAttributeFor():设置属性
xstream.aliasField():为字段设置别名
xstream.aliasAttribute():为属性设置别名
xstream.addImplicitCollection():集合节点隐藏,只显示子信息节点
xstream.processAnnotations():处理Annotations信息
xstream.autodetectAnnotations():自动侦查注解
3. 常用的注解
@XStreamAlias("message"):为类和字段设置别名
@XStreamImplicit(itemFieldName="part"): 隐式集合注解
@XStreamAsAttribute:转换成属性
@XStreamOmitField:不跟XML对应,需要省略的字段
@XStreamConverter():注入转换器
三、代码示例
1. 假设有如下XML内容要转换成JAVA对象
<?xml version="1.0" encoding="UTF-8"?> <table name="ts_user" comment="用户信息"> <column name="id" type="char" length="10" comment="ID"></column> <column name="name" type="varchar" length="50" comment="用户名"></column> <column name="password" type="varchar" length="100" comment="密码"></column> <column name="age" type="int" length="11" comment="年龄"></column> <column name="createDate" type="date" comment="创建日期"></column> </table>
2. 创建对应的model类
import java.util.List; import com.thoughtworks.xstream.annotations.XStreamAlias; import com.thoughtworks.xstream.annotations.XStreamAsAttribute; import com.thoughtworks.xstream.annotations.XStreamImplicit; @XStreamAlias("table") public class Table { @XStreamAsAttribute private String name; @XStreamAsAttribute private String comment; @XStreamImplicit(itemFieldName="column") private List<Column> columnList; public String getName() { return name; } public void setName(String name) { this.name = name; } public String getComment() { return comment; } public void setComment(String comment) { this.comment = comment; } public List<Column> getColumnList() { return columnList; } public void setColumnList(List<Column> columnList) { this.columnList = columnList; } } import com.thoughtworks.xstream.annotations.XStreamAlias; import com.thoughtworks.xstream.annotations.XStreamAsAttribute; @XStreamAlias("column") public class Column { @XStreamAsAttribute private String name; @XStreamAsAttribute private String type; @XStreamAsAttribute private Integer length; @XStreamAsAttribute private String comment; public String getName() { return name; } public void setName(String name) { this.name = name; } public String getType() { return type; } public void setType(String type) { this.type = type; } public Integer getLength() { return length; } public void setLength(Integer length) { this.length = length; } public String getComment() { return comment; } public void setComment(String comment) { this.comment = comment; } }
3. 转换代码
XStream xstream = new XStream(); xstream.processAnnotations(new Class[]{Table.class, Column.class}); Table table = (Table)xstream.fromXML(xmlContent); // xmlContent为xml内容
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