JAXBContext转换包含集合属性的xml与java集合对象Demo

川长思鸟来 2021-06-24 14:00 398阅读 0赞

核心类：

package com.jaxb;
    
    import java.io.File;
    import java.io.FileInputStream;
    import java.io.IOException;
    import java.io.InputStream;
    import java.text.MessageFormat;
    
    import javax.xml.bind.JAXBContext;
    import javax.xml.bind.JAXBException;
    import javax.xml.bind.Unmarshaller;
    
    public class JaxbReadXml {
    
        @SuppressWarnings("unchecked")
        public static <T> T readString(Class<T> clazz, String context) throws JAXBException {
            try {
                JAXBContext jc = JAXBContext.newInstance(clazz);
                Unmarshaller u = jc.createUnmarshaller();
                return (T) u.unmarshal(new File(context));
            } catch (JAXBException e) {
                // logger.trace(e);
                throw e;
            }
        }
    
        @SuppressWarnings("unchecked")
        public static <T> T readConfig(Class<T> clazz, String config, Object... arguments) throws IOException,
                JAXBException {
            InputStream is = null;
            try {
                if (arguments.length > 0) {
                    config = MessageFormat.format(config, arguments);
                }
                // logger.trace("read configFileName=" + config);
                JAXBContext jc = JAXBContext.newInstance(clazz);
                Unmarshaller u = jc.createUnmarshaller();
                is = new FileInputStream(config);
                return (T) u.unmarshal(is);
            } catch (IOException e) {
                // logger.trace(config, e);
                throw e;
            } catch (JAXBException e) {
                // logger.trace(config, e);
                throw e;
            } finally {
                if (is != null) {
                    is.close();
                }
            }
        }
    
        @SuppressWarnings("unchecked")
        public static <T> T readConfigFromStream(Class<T> clazz, InputStream dataStream) throws JAXBException {
            try {
                JAXBContext jc = JAXBContext.newInstance(clazz);
                Unmarshaller u = jc.createUnmarshaller();
                return (T) u.unmarshal(dataStream);
            } catch (JAXBException e) {
                // logger.trace(e);
                throw e;
            }
        }
    
        public static void main(String[] args) throws JAXBException {
            TestOrgs testOrgs = JaxbReadXml.readString(TestOrgs.class, "test/test.xml");
            System.out.println(testOrgs.getSize());
            System.out.println(testOrgs.getBatchNumber());
            System.out.println(testOrgs.getErrmsg());
            for (TestOrg o : testOrgs) {
                System.out.println(o.getOrgName());
            }
        }
    }

成员类：

package com.jaxb;
    
    import java.util.ArrayList;
    import java.util.List;
    
    import javax.xml.bind.annotation.XmlAccessType;
    import javax.xml.bind.annotation.XmlAccessorType;
    import javax.xml.bind.annotation.XmlAttribute;
    import javax.xml.bind.annotation.XmlElement;
    import javax.xml.bind.annotation.XmlRootElement;
    
    @SuppressWarnings("serial")
    @XmlRootElement(name = "orgs")
    @XmlAccessorType(XmlAccessType.FIELD)
    public class TestOrgs extends ArrayList<TestOrg> { // 泛化, 聚合
    
        @XmlAttribute(name = "size")
        private int size;
        @XmlAttribute(name = "batch_number")
        private Long batchNumber;
        @XmlAttribute(name = "errmsg")
        private String errmsg;
    
        @XmlElement(name = "org")
        public List<TestOrg> getOrgs() {
            return this;
        }
    
        public int getSize() {
            return size;
        }
    
        public void setSize(int size) {
            this.size = size;
        }
    
        public Long getBatchNumber() {
            return batchNumber;
        }
    
        public void setBatchNumber(Long batchNumber) {
            this.batchNumber = batchNumber;
        }
    
        public String getErrmsg() {
            return errmsg;
        }
    
        public void setErrmsg(String errmsg) {
            this.errmsg = errmsg;
        }
    
    }

成员类2：

package com.jaxb;
    
    import java.util.Date;
    
    import javax.xml.bind.annotation.XmlAccessType;
    import javax.xml.bind.annotation.XmlAccessorType;
    import javax.xml.bind.annotation.XmlElement;
    
    /**
     * <pre>
     *     If you annotate your Artifact class with the annotation:
     *  @XmlAccessorType(XmlAccessType.FIELD)
     *  then you do not need to annotate the fields with @XmlElement and the
     *  setter/getter methods will be ignored.
     * </pre>
     * 
     * @author User
     */
    @XmlAccessorType(XmlAccessType.FIELD)
    // 用了这个之后就会自动忽略setter/getter方法。不用这个就需要去掉注解，需要保证属性名和xml里的表签名一致
    public class TestOrg {
        @XmlElement(name = "org_id")
        private Long orgId;
        @XmlElement(name = "parent_id")
        private Long parentId;
        @XmlElement(name = "org_name")
        private String orgName;
        @XmlElement(name = "org_code")
        private String orgCode;
        @XmlElement(name = "org_type")
        private String orgType;
        @XmlElement(name = "start_d")
        private Date startDate;
        @XmlElement(name = "end_d")
        private Date endDate;
        @XmlElement(name = "attribute1")
        private String attribute;
        @XmlElement(name = "insert_t")
        private Date insertTime;
    
        public Long getOrgId() {
            return orgId;
        }
    
        public void setOrgId(Long orgId) {
            this.orgId = orgId;
        }
    
        public Long getParentId() {
            return parentId;
        }
    
        public void setParentId(Long parentId) {
            this.parentId = parentId;
        }
    
        public String getOrgName() {
            return orgName;
        }
    
        public void setOrgName(String orgName) {
            this.orgName = orgName;
        }
    
        public String getOrgCode() {
            return orgCode;
        }
    
        public void setOrgCode(String orgCode) {
            this.orgCode = orgCode;
        }
    
        public String getOrgType() {
            return orgType;
        }
    
        public void setOrgType(String orgType) {
            this.orgType = orgType;
        }
    
        public Date getStartDate() {
            return startDate;
        }
    
        public void setStartDate(Date startDate) {
            this.startDate = startDate;
        }
    
        public Date getEndDate() {
            return endDate;
        }
    
        public void setEndDate(Date endDate) {
            this.endDate = endDate;
        }
    
        public String getAttribute() {
            return attribute;
        }
    
        public void setAttribute(String attribute) {
            this.attribute = attribute;
        }
    
        public Date getInsertTime() {
            return insertTime;
        }
    
        public void setInsertTime(Date insertTime) {
            this.insertTime = insertTime;
        }
    
    }

xml文件：

<?xml version="1.0" encoding="UTF-8"?>
    <orgs size="7095" batch_number="20130704110039" errmsg="">
        <org>
            <org_id>16817</org_id>
            <parent_id>9233</parent_id>
            <org_name>512AAS.苏州沧浪区</org_name>
            <org_code>512AAS</org_code>
            <org_type>门店部门</org_type>
            <start_d>2011-12-28</start_d>
            <end_d></end_d>
            <attribute1></attribute1>
            <insert_t>2013-7-4 10:32:09</insert_t>
        </org>
        <org>
            <org_id>16817</org_id>
            <parent_id>9233</parent_id>
            <org_name>512AAS.苏州沧浪区</org_name>
            <org_code>512AAS</org_code>
            <org_type>门店部门</org_type>
            <start_d>2011-12-28</start_d>
            <end_d></end_d>
            <attribute1></attribute1>
            <insert_t>2013-7-4 10:32:09</insert_t>
        </org>
        <org>
            <org_id>16817</org_id>
            <parent_id>9233</parent_id>
            <org_name>512AAS.苏州沧浪区</org_name>
            <org_code>512AAS</org_code>
            <org_type>门店部门</org_type>
            <start_d>2011-12-28</start_d>
            <end_d></end_d>
            <attribute1></attribute1>
            <insert_t>2013-7-4 10:32:09</insert_t>
        </org>
        <org>
            <org_id>16817</org_id>
            <parent_id>9233</parent_id>
            <org_name>512AAS.苏州沧浪区</org_name>
            <org_code>512AAS</org_code>
            <org_type>门店部门</org_type>
            <start_d>2011-12-28</start_d>
            <end_d></end_d>
            <attribute1></attribute1>
            <insert_t>2013-7-4 10:32:09</insert_t>
        </org>
        <org>
            <org_id>16817</org_id>
            <parent_id>9233</parent_id>
            <org_name>512AAS.苏州沧浪区</org_name>
            <org_code>512AAS</org_code>
            <org_type>门店部门</org_type>
            <start_d>2011-12-28</start_d>
            <end_d></end_d>
            <attribute1></attribute1>
            <insert_t>2013-7-4 10:32:09</insert_t>
        </org>
    </orgs>

转载自：[http://www.cnblogs.com/superjt/p/3310322.html][http_www.cnblogs.com_superjt_p_3310322.html]

[http_www.cnblogs.com_superjt_p_3310322.html]: http://www.cnblogs.com/superjt/p/3310322.html