xstream realizes the mutual conversion between java objects and XML

1. Introduction to XStream

 

1. The function of XStream: mutual conversion between Java objects and XML.

 

2. Features of XStream: flexible and easy to use, high performance, clean XML, custom transformation strategy, error diagnosis, etc.

 

3. XStream usage scenarios: transformation; persistent objects; configuration; unit testing.

 

4. Dependent packages: xstream-[version].jar, xpp3-[version].jar, xmlpull-[version].jar

 

5. Configuration of pom.xml file in MAVEN

 

<dependency>

    <groupId>com.thoughtworks.xstream</groupId>

    <artifactId>xstream</artifactId>

    <version>1.4.9</version>

</dependency>

 

Second, the use of XStream

 

1. Create an XStream instance

 

    XStream xstream = new XStream();

    XStream xstream = new XStream(new DomDriver());

    XStream xstream = new XStream(new StaxDriver());

 

2. Common methods

 

    xstream.toXML(): Convert the object to XML

    xstream.fromXML(): convert XML to object

    xstream.alias(): create an alias for the specified class

    xstream.useAttributeFor(): set attributes

    xstream.aliasField(): set an alias for the field

    xstream.aliasAttribute(): set an alias for the attribute

    xstream.addImplicitCollection(): The collection node is hidden, only the child information nodes are displayed

    xstream.processAnnotations(): Process Annotations information

    xstream.autodetectAnnotations(): Automatically detect annotations

 

3. Commonly used annotations

 

    @XStreamAlias("message"): Set aliases for classes and fields

    @XStreamImplicit(itemFieldName="part"): Implicit collection annotation

    @XStreamAsAttribute: Convert to attribute

    @XStreamOmitField: fields that do not correspond to XML and need to be omitted

    @XStreamConverter(): inject converter

 

3. Code example

 

1. Suppose there is the following XML content to be converted into JAVA objects

 

<?xml version="1.0" encoding="UTF-8"?>
<table name="ts_user" comment="User information">
	<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. Create the corresponding model class

 

 

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. Convert the code

 

 

        XStream xstream = new XStream();
        xstream.processAnnotations(new Class[]{Table.class, Column.class});
        Table table = (Table)xstream.fromXML(xmlContent); // xmlContent is xml content