解析XML XStream

解析XML方法很多，XStream是比较简洁的

1、把Java类转成XML

import com.thoughtworks.xstream.XStream;

public class ErrorCode {
	private int errorCode;

	public ErrorCode(int ecode,String msg) {
		this.errorCode = ecode;
		this.errorMsg = msg;
	}
	public int getErrorCode() {
		return errorCode;
	}

	public void setErrorCode(int errorCode) {
		this.errorCode = errorCode;
	}

	private String errorMsg;

	public String getErrorMsg() {
		return errorMsg;
	}

	public void setErrorMsg(String errorMsg) {
		this.errorMsg = errorMsg;
	}

	public String toXmlString() {
		XStream xstream = new XStream();
		xstream.alias("result", ErrorCode.class);
		return "<?xml version=\"1.0\" encoding=\"UTF-8\" ?>"+xstream.toXML(this);
	}	
}

2、把XML转成Java类

 public ErrorCode toObj(String xml){  
        XStream xstream = new XStream();
        xstream.alias("result", ErrorCode.class);
        return (ErrorCode)xstream.fromXML(xml);
}

3、复杂的，需要转换xml节点名称和类名称的，需要使用Java的注释功能

import java.util.List;

import com.thoughtworks.xstream.XStream;
import com.thoughtworks.xstream.annotations.XStreamAlias;
import com.thoughtworks.xstream.annotations.XStreamImplicit;
@XStreamAlias("indicatorValueElements")
public class IndicatorValueElements{
	@XStreamImplicit(itemFieldName="indicatorValue")
	private List<IndicatorValue> elements;

	public List<IndicatorValue> getElements() {
		return elements;
	}

	public void setElements(List<IndicatorValue> elements) {
		this.elements = elements;
	}
	public static IndicatorValueElements valueOf(String xmlStr){
		XStream xstream = new XStream();
		xstream.alias("indicatorValueElements", IndicatorValueElements.class);
		xstream.autodetectAnnotations(true);
		return (IndicatorValueElements)xstream.fromXML(xmlStr);
	}
}

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<indicatorValueElements>
    <indicatorValue>
       <dateString>2000-12</dateString><value>2727.96</value>
   </indicatorValue>
</indicatorValueElements>

@XStreamAlias("indicatorValue")
public class IndicatorValue implements Comparable<IndicatorValue>{
	private String dateString;
	private String value;

	public String getDateString() {
		return dateString;
	}

	public void setDateString(String dateString) {
		this.dateString = dateString;
	}

	public String getValue() {
		return value;
	}

	public void setValue(String value) {
		this.value = value;
	}

	public int compareTo(IndicatorValue o) {
		// TODO Auto-generated method stub
		return this.getDateString().compareTo(o.getDateString());
	}
}