XML转换

XmlUtils

package com.daily.xmltest;

import com.alibaba.fastjson.JSON;
import org.apache.log4j.Logger;
import org.springframework.util.CollectionUtils;
import org.springframework.util.StopWatch;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;
import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import java.io.IOException;
import java.io.Reader;
import java.io.StringReader;
import java.io.StringWriter;
import java.io.Writer;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;

public class XmlUtils {

    private final static Logger log = Logger.getLogger(XmlUtils.class);

    private static Map>, JAXBContext> jaxbContextMap = new HashMap>, JAXBContext>();
    private static Map>, Unmarshaller> unmarshallerMap = new HashMap>, Unmarshaller>();

    private static XMLInputFactory xmlInputFactory = XMLInputFactory.newFactory();

    static {
        xmlInputFactory.setProperty(XMLInputFactory.IS_SUPPORTING_EXTERNAL_ENTITIES, false);
        xmlInputFactory.setProperty(XMLInputFactory.SUPPORT_DTD, true);
    }

    private static JAXBContext getJaxbInstance(Class... classesToBeBound) throws JAXBException {
        return getJaxbInstance(null, classesToBeBound);
    }

    private static JAXBContext getJaxbInstance(HashSet classes, Class... classesToBeBound) throws JAXBException {
        if (classes == null){
            classes = new HashSet>(CollectionUtils.arrayToList(classesToBeBound));
        }
        JAXBContext jaxbContext = jaxbContextMap.get(classes);
        if (jaxbContext == null){
            jaxbContext = JAXBContext.newInstance(classesToBeBound);
            jaxbContextMap.put(classes, jaxbContext);
        }
        return jaxbContext;
    }

    private static Unmarshaller getUnmarshallerInstance(Class... classesToBeBound) throws JAXBException {
        HashSet classes = new HashSet>(CollectionUtils.arrayToList(classesToBeBound));
        Unmarshaller unmarshaller = unmarshallerMap.get(classes);
        if (unmarshaller == null){
            JAXBContext jaxbContext = getJaxbInstance(classes, classesToBeBound);
            unmarshaller = jaxbContext.createUnmarshaller();
            unmarshallerMap.put(classes, unmarshaller);
        }

        return unmarshaller;
    }

    /**
     * 将javabean转换为XML字符串
     * @param object
     * @return
     */
    public static String convertToXmlStr(Object object, Class... classesToBeBound) {
        StopWatch stopWatch = new StopWatch();
        stopWatch.start();
        Writer xmlStr = new StringWriter();
        try {
            if (classesToBeBound == null || classesToBeBound.length == 0){
                classesToBeBound = new Class[]{object.getClass()};
            }
            JAXBContext context = getJaxbInstance(classesToBeBound);
            Marshaller marshaller = context.createMarshaller();
            marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.FALSE);
            marshaller.marshal(object, xmlStr);
            stopWatch.stop();
            log.info("Object convert to XML str success, " + xmlStr + ",cost time:" + stopWatch.getTotalTimeMillis() + "ms");
        } catch (JAXBException e) {
            e.printStackTrace();
        } finally {
            if(xmlStr != null) {
                try {
                    xmlStr.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return xmlStr.toString().replace("standalone=\"yes\"", "");
    }

    /**
     * 将XML字符串转换为指定类型的javabean
     * @param classesToBeBound 指定所有class
     * @param xmlStr xml字符串
     * @return
     */
    public static Object xmlStrToObject(String xmlStr, Class... classesToBeBound) {
        StopWatch stopWatch = new StopWatch();
        stopWatch.start();
        Object xmlObject = null;
        Reader reader = null;
        XMLStreamReader xmlStreamReader = null;
        try {
            log.info("XML Str convert to Object, xmlStr=" + xmlStr);
            JAXBContext context = getJaxbInstance(classesToBeBound);
            Unmarshaller unmarshaller = context.createUnmarshaller();
            reader = new StringReader(xmlStr);
            xmlStreamReader = xmlInputFactory.createXMLStreamReader(reader);
            xmlObject = unmarshaller.unmarshal(xmlStreamReader);
            stopWatch.stop();
            log.info("XML Str convert to Object success, " + JSON.toJSONString(xmlObject) + ",cost time:" + stopWatch.getTotalTimeMillis() + "ms");
        } catch (JAXBException e) {
            e.printStackTrace();
        } catch (XMLStreamException e) {
            e.printStackTrace();
        } finally {
            if (null != xmlStreamReader){
                try {
                    xmlStreamReader.close();
                } catch (XMLStreamException e) {
                    e.printStackTrace();
                }
            }
            if (null != reader) {
                try {
                    reader.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return xmlObject;
    }

    /**
     * 获取节点值
     * @param xmlStr
     * @param nodeName
     * @return
     */
    public static String getNodeValue(String xmlStr, String nodeName){
        if (xmlStr == null) {
            return null;
        }
        int startPos = xmlStr.indexOf("<" + nodeName + ">");
        if (startPos == -1) {
            return null;
        }
        int endPos = xmlStr.lastIndexOf("");
        if (endPos == -1) {
            return null;
        }
        return xmlStr.substring(startPos + ("").length() - 1, endPos);
    }

}

Bean

package com.daily.xmltest.Bean;

import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlType;
import java.io.Serializable;

@XmlType
@XmlAccessorType(XmlAccessType.FIELD)
@XmlRootElement(name="data")
public class School implements Serializable {

    private String schoolName;

    private String address;

    public String getSchoolName() {
        return schoolName;
    }

    public void setSchoolName(String schoolName) {
        this.schoolName = schoolName;
    }

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }
}

测试

package com.daily.xmltest;

import com.alibaba.fastjson.JSON;
import com.daily.xmltest.Bean.School;
import org.junit.Test;

public class XMLTest {

    @Test
    public void test() {
        School school = new School();
        school.setSchoolName("一中");
        school.setAddress("益阳");

        String schoolStr = XmlUtils.convertToXmlStr(school);
        System.out.println(schoolStr);

        School parseSchool = (School) XmlUtils.xmlStrToObject(schoolStr, School.class);
        System.out.println(JSON.toJSONString(parseSchool));
    }
}