先定義XML格式

順序和存放值，都在實體類中限制，如下：

import javax.xml.bind.annotation.*;
import java.util.ArrayList;
import java.util.List;
/**
 * @Author: Administrator
 * @Description:
 * @Date: 2019-09-03 13:52
 * @Modified By:
 */
@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "",propOrder = {
        "clazz"
})
@XmlRootElement(name = "ROOT")
public class ClazzXml {
    @XmlElement(name = "CLAZZ",required = true)
    private List<ClazzXml.CLAZZ> clazz;
    public List<CLAZZ> getClazz() {
        if(clazz==null){
            clazz=new ArrayList<ClazzXml.CLAZZ>();
        }
        return this.clazz;
    }
    public void setClazz(List<CLAZZ> clazz) {
        this.clazz = clazz;
    }
    /**
     *班級xml
     */
    @XmlAccessorType(XmlAccessType.FIELD)
    @XmlType(name = "",propOrder = {
          "csitem",
          "studentitems"
    })
    public static class CLAZZ{
        @XmlElement(name = "CSITEM",required = true)
        private ClazzXml.CLAZZ.CSITEM csitem;
        @XmlElement(name = "STUDENTITEMS",required = true)
        private ClazzXml.CLAZZ.STUDENTITEMS studentitems;
        public CSITEM getCsitem() {
            if(csitem==null){
                csitem=new ClazzXml.CLAZZ.CSITEM();
            }
            return this.csitem;
        }
        public void setCsitem(CSITEM csitem) {
            this.csitem = csitem;
        }
        public STUDENTITEMS getStudentitems() {
            if(studentitems==null){
                studentitems=new ClazzXml.CLAZZ.STUDENTITEMS();
            }
            return this.studentitems;
        }
        public void setStudentitems(STUDENTITEMS studentitems) {
            this.studentitems = studentitems;
        }
        /**
         * 班級信息
         */
        @XmlAccessorType(XmlAccessType.FIELD)
        @XmlType(name = "",propOrder = {
                "csname",
                "csnumber",
                "csaddress",
                "headteacher"
        })
        public static class CSITEM{
            @XmlElement(name = "CSNAME",required = true)
            private String csname;
            @XmlElement(name = "CSNUMBER",required = true)
            private Integer csnumber;
            @XmlElement(name = "CSADDRESS",required = true)
            private String csaddress;
            @XmlElement(name = "HEADTEACHER",required = true)
            private String headteacher;
            public String getCsname() {
                return csname;
            }
            public void setCsname(String csname) {
                this.csname = csname;
            }
            public Integer getCsnumber() {
                return csnumber;
            }
            public void setCsnumber(Integer csnumber) {
                this.csnumber = csnumber;
            }
            public String getCsaddress() {
                return csaddress;
            }
            public void setCsaddress(String csaddress) {
                this.csaddress = csaddress;
            }
            public String getHeadteacher() {
                return headteacher;
            }
            public void setHeadteacher(String headteacher) {
                this.headteacher = headteacher;
            }
        }
        @XmlAccessorType(XmlAccessType.FIELD)
        @XmlType(name = "",propOrder = {
                "studentitem"
        })
        public static class STUDENTITEMS{
            @XmlElement(name = "STUDENTITEM",required = true)
            private List<ClazzXml.CLAZZ.STUDENTITEMS.STUDENTITEM> studentitem;
            public List<STUDENTITEM> getStudentitem() {
                if(studentitem==null){
                    studentitem=new ArrayList<ClazzXml.CLAZZ.STUDENTITEMS.STUDENTITEM>();
                }
                return this.studentitem;
            }
            public void setStudentitem(List<STUDENTITEM> studentitem) {
                this.studentitem = studentitem;
            }
            @XmlAccessorType(XmlAccessType.FIELD)
            @XmlType(name = "",propOrder = {
                    "sid",
                    "sname",
                    "sage",
                    "ssex",
                    "height",
                    "weight",
                    "ranking",
                    "birthday"
            })
            public static class STUDENTITEM{
                @XmlElement(name = "SID",required = true)
                private String sid;
                @XmlElement(name = "SNAME",required = true)
                private String sname;
                @XmlElement(name = "SAGE",required = true)
                private Integer sage;
                @XmlElement(name = "SSEX",required = true)
                private String ssex;
                @XmlElement(name = "HEIGHT",required = true)
                private Double height;
                @XmlElement(name = "WEIGHT",required = true)
                private Double weight;
                @XmlElement(name = "RANKING",required = true)
                private Integer ranking;
                @XmlElement(name = "BIRTHDAY",required = true)
                private String birthday;
                public String getSid() {
                    return sid;
                }
                public void setSid(String sid) {
                    this.sid = sid;
                }
                public String getSname() {
                    return sname;
                }
                public void setSname(String sname) {
                    this.sname = sname;
                }
                public Integer getSage() {
                    return sage;
                }
                public void setSage(Integer sage) {
                    this.sage = sage;
                }
                public String getSsex() {
                    return ssex;
                }
                public void setSsex(String ssex) {
                    this.ssex = ssex;
                }
                public Double getHeight() {
                    return height;
                }
                public void setHeight(Double height) {
                    this.height = height;
                }
                public Double getWeight() {
                    return weight;
                }
                public void setWeight(Double weight) {
                    this.weight = weight;
                }
                public Integer getRanking() {
                    return ranking;
                }

                public void setRanking(Integer ranking) {
                    this.ranking = ranking;
                }
                public String getBirthday() {
                    return birthday;
                }
                public void setBirthday(String birthday) {
                    this.birthday = birthday;
                }
            }
        }
  }
}

快速創(chuàng)建實體類方法類

/**
 * @Author: Administrator
 * @Description:
 * @Date: 2019-09-03 15:08
 * @Modified By:
 */
public class ClazzFactory {
    public ClazzFactory(){
    }
    public ClazzXml creatROOT(){
        return new ClazzXml();
    }
    public ClazzXml.CLAZZ creatROOTCLAZZ(){
        return new ClazzXml.CLAZZ();
    }
    public ClazzXml.CLAZZ.CSITEM creatROOTCLAZZCSITEM(){
        return new ClazzXml.CLAZZ.CSITEM();
    }
    public ClazzXml.CLAZZ.STUDENTITEMS creatROOTCLAZZSTUDENTITEMS(){
        return new ClazzXml.CLAZZ.STUDENTITEMS();
    }
    public ClazzXml.CLAZZ.STUDENTITEMS.STUDENTITEM creatROOTCLAZZSTUDENTITEMSSTUDENTITEM(){
        return new ClazzXml.CLAZZ.STUDENTITEMS.STUDENTITEM();
    }
}

bean對象與XML轉換工具類

import javax.xml.bind.*;
import java.io.File;
import java.io.StringReader;
import java.io.StringWriter;
/**
 * @Author: Administrator
 * @Description:
 * @Date: 2019-09-03 16:03
 * @Modified By:
 */
public class XmlUtil {
    /**
     * bean2Xml
     *
     * @param bean
     *        要轉換成xml的bean對象
     * @param xsdName
     *        生成的xml文件受哪個xsd約束
     *        可以為空
     * @return
     *         生成的xml字符串
     * @throws JAXBException
     */
    public static String bean2Xml(Object bean, String xsdName) throws JAXBException {
        StringWriter stringWriter;
        try {
            JAXBContext context = JAXBContext.newInstance(bean.getClass());
            Marshaller mar = context.createMarshaller();
            stringWriter = new StringWriter();
            // 添加xsd約束
            if (xsdName != null && !"".equals(xsdName)) {
                mar.setProperty(Marshaller.JAXB_NO_NAMESPACE_SCHEMA_LOCATION, xsdName);
            }
            mar.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
            mar.setProperty(Marshaller.JAXB_ENCODING,"UTF-8");
            mar.marshal(bean, stringWriter);
        } catch (PropertyException e) {
            throw e;
        } catch (JAXBException e) {
            throw e;
        }
        StringBuffer buffer = stringWriter.getBuffer();
        return buffer.toString();
    }
    /**
     * bean2Xml
     *
     * @param bean
     *        要轉換成xml的bean對象
     * @param filePath
     *        生成文件的全路徑（含文件名）
     * @param xsdName
     *        生成的xml文件受哪個xsd約束
     *        可以為空
     * @return
     *         生成的xml字符串
     * @throws JAXBException
     */
    public static void bean2Xml(Object bean, String filePath, String xsdName) throws JAXBException {
        try {
            JAXBContext context = JAXBContext.newInstance(bean.getClass());
            Marshaller mar = context.createMarshaller();
            // 添加xsd約束
            if (xsdName != null && !"".equals(xsdName)) {
                mar.setProperty(Marshaller.JAXB_NO_NAMESPACE_SCHEMA_LOCATION, xsdName);
            }
            mar.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
            mar.setProperty(Marshaller.JAXB_ENCODING,"GBK");
            mar.marshal(bean, new File(filePath));
        } catch (PropertyException e) {
            throw e;
        } catch (JAXBException e) {
            throw e;
        }
    }
    /**
     * xml2Bean
     * 將字符串形式的xml轉換成bean
     *
     * @param <T>
     * @param clazz
     * @param xmlString
     * @return javaBean
     * @throws JAXBException
     */
    @SuppressWarnings("unchecked")
    public static <T> T xml2Bean(Class<T> clazz, String xmlString) throws JAXBException {
        T result = null;
        try {
            JAXBContext context = JAXBContext.newInstance(clazz);
            Unmarshaller unmar = context.createUnmarshaller();
            StringReader inputStream = new StringReader(xmlString);
            result = (T) unmar.unmarshal(inputStream);
        } catch (JAXBException e) {
            e.printStackTrace();
            throw e;
        }
        return result;
    }
}

測試類，如果導出，需要HttpServletResponse 這里做測試，主要測試xml的生成，導出的方法也有因為是自測的main所以無法實現(xiàn)導出

package com.example.springboot09.com.test;
import com.example.springboot09.com.pojo.ClazzFactory;
import com.example.springboot09.com.pojo.ClazzXml;
import com.example.springboot09.com.util.XmlUtil;
import javax.servlet.http.HttpServletResponse;
import java.io.BufferedOutputStream;
import java.text.SimpleDateFormat;
import java.util.Date;
/**
 * @Author: Administrator
 * @Description:
 * @Date: 2019-09-03 15:22
 * @Modified By:
 */
public class Test3 {
    private static ClazzFactory factory=new ClazzFactory();
    private static ClazzXml root=new ClazzXml();
    private static ClazzXml.CLAZZ clazz=new ClazzXml.CLAZZ();
    private static ClazzXml.CLAZZ.CSITEM csitem=new ClazzXml.CLAZZ.CSITEM();
    private static ClazzXml.CLAZZ.STUDENTITEMS studentitems=new ClazzXml.CLAZZ.STUDENTITEMS();
    private static ClazzXml.CLAZZ.STUDENTITEMS.STUDENTITEM studentitem=new ClazzXml.CLAZZ.STUDENTITEMS.STUDENTITEM();
    public static void main(String[] args) {
        HttpServletResponse response=null;
        clazz=factory.creatROOTCLAZZ();
        queryCsItem();//封裝班級信息
        queryStudentitems();//封裝學生新
        //creatAndSendXML(response);//生成XML response從前臺獲取的再controller中實現(xiàn)，因為本次實現(xiàn)未再前臺頁面調(diào)用，導出XML的方法 所以response為臨時值，主要測試XML數(shù)據(jù)封裝
        try {
            Thread.sleep(10000);
        }catch (Exception e){
            e.printStackTrace();
        }
        creatAndSendXML11();
    }
    public static void queryCsItem(){
        csitem=factory.creatROOTCLAZZCSITEM();
        csitem.setCsname("高一一班");
        csitem.setCsnumber(80);
        csitem.setCsaddress("北院南棟401");
        csitem.setHeadteacher("高一一");
        clazz.setCsitem(csitem);
    }
    public static void queryStudentitems(){
        studentitems=factory.creatROOTCLAZZSTUDENTITEMS();
        //for (){}
        studentitem=factory.creatROOTCLAZZSTUDENTITEMSSTUDENTITEM();
        studentitem.setSid("9001401010101");
        studentitem.setSname("馬超");
        studentitem.setSage(16);
        studentitem.setSsex("男");
        studentitem.setHeight(180.0);
        studentitem.setWeight(65.00);
        studentitem.setRanking(1);
        studentitem.setBirthday("2000-01-01");
        studentitems.getStudentitem().add(studentitem);
        ClazzXml.CLAZZ.STUDENTITEMS.STUDENTITEM  studentitem2=new ClazzXml.CLAZZ.STUDENTITEMS.STUDENTITEM();
        studentitem2.setSid("9001401010102");
        studentitem2.setSname("趙云");
        studentitem2.setSage(16);
        studentitem2.setSsex("男");
        studentitem2.setHeight(170.0);
        studentitem2.setWeight(60.00);
        studentitem2.setRanking(2);
        studentitem2.setBirthday("2000-01-01");
        studentitems.getStudentitem().add(studentitem2);
        ClazzXml.CLAZZ.STUDENTITEMS.STUDENTITEM  studentitem3=new ClazzXml.CLAZZ.STUDENTITEMS.STUDENTITEM();
        studentitem3.setSid("9001401010103");
        studentitem3.setSname("孫尚香");
        studentitem3.setSage(16);
        studentitem3.setSsex("女");
        studentitem3.setHeight(160.0);
        studentitem3.setWeight(48.00);
        studentitem3.setRanking(3);
        studentitem3.setBirthday("2000-01-01");
        studentitems.getStudentitem().add(studentitem3);
        ClazzXml.CLAZZ.STUDENTITEMS.STUDENTITEM studentitem4=new ClazzXml.CLAZZ.STUDENTITEMS.STUDENTITEM();
        studentitem4.setSid("9001401010104");
        studentitem4.setSname("貂蟬");
        studentitem4.setSage(16);
        studentitem4.setSsex("女");
        studentitem4.setHeight(170.0);
        studentitem4.setWeight(50.00);
        studentitem4.setRanking(4);
        studentitem4.setBirthday("2000-01-01");
        studentitems.getStudentitem().add(studentitem4);
        clazz.setStudentitems(studentitems);
        root.getClazz().add(clazz);
    }
    /**
     * 測試xml
     */
    public static void creatAndSendXML11(){
        String xml = "";
        try {
           xml=XmlUtil.bean2Xml(root,"");
            System.out.println(xml);
        }catch (Exception e){
            e.printStackTrace();
        }
    }
    /**
     * 導出xml 需要HttpServletResponse response
     */
    public static void creatAndSendXML(HttpServletResponse response){
        String xml = "";
        BufferedOutputStream output = null;
        try {
            SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");
            String date = sdf.format(new Date());
            response.setCharacterEncoding("utf-8");
            response.setContentType("application/x-msdownload");
            xml = XmlUtil.bean2Xml(root,"");
            System.out.println("XML--->"+root);
            response.addHeader("Content-Disposition","attachment;filename=CLAZZ"+date+"90014010101"+".xml");
            output = new BufferedOutputStream(response.getOutputStream());
            output.write(xml.getBytes());
            output.flush();   //不可少
            response.flushBuffer();//不可少
        }catch (Exception e){
            e.printStackTrace();
        }finally {
            try {
                output.close();
            }catch (Exception e){
                e.printStackTrace();
            }
        }
    }
}

導出結果如下

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<ROOT>
    <CLAZZ>
        <CSITEM>
            <CSNAME>高一一班</CSNAME>
            <CSNUMBER>80</CSNUMBER>
            <CSADDRESS>北院南棟401</CSADDRESS>
            <HEADTEACHER>高一一</HEADTEACHER>
        </CSITEM>
        <STUDENTITEMS>
            <STUDENTITEM>
                <SID>9001401010101</SID>
                <SNAME>馬超</SNAME>
                <SAGE>16</SAGE>
                <SSEX>男</SSEX>
                <HEIGHT>180.0</HEIGHT>
                <WEIGHT>65.0</WEIGHT>
                <RANKING>1</RANKING>
                <BIRTHDAY>2000-01-01</BIRTHDAY>
            </STUDENTITEM>
            <STUDENTITEM>
                <SID>9001401010102</SID>
                <SNAME>趙云</SNAME>
                <SAGE>16</SAGE>
                <SSEX>男</SSEX>
                <HEIGHT>170.0</HEIGHT>
                <WEIGHT>60.0</WEIGHT>
                <RANKING>2</RANKING>
                <BIRTHDAY>2000-01-01</BIRTHDAY>
            </STUDENTITEM>
            <STUDENTITEM>
                <SID>9001401010103</SID>
                <SNAME>孫尚香</SNAME>
                <SAGE>16</SAGE>
                <SSEX>女</SSEX>
                <HEIGHT>160.0</HEIGHT>
                <WEIGHT>48.0</WEIGHT>
                <RANKING>3</RANKING>
                <BIRTHDAY>2000-01-01</BIRTHDAY>
            </STUDENTITEM>
            <STUDENTITEM>
                <SID>9001401010104</SID>
                <SNAME>貂蟬</SNAME>
                <SAGE>16</SAGE>
                <SSEX>女</SSEX>
                <HEIGHT>170.0</HEIGHT>
                <WEIGHT>50.0</WEIGHT>
                <RANKING>4</RANKING>
                <BIRTHDAY>2000-01-01</BIRTHDAY>
            </STUDENTITEM>
        </STUDENTITEMS>
    </CLAZZ>
</ROOT>

以上就是關于“導出XML格式文件的步驟”的介紹，如果大家想了解更多相關知識，不妨來關注一下動力節(jié)點的Java在線學習，里面還有更豐富的知識等著大家去學習，希望對大家能夠有所幫助。