目录
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第一章、Java对象转xml
1.1）Java实体类
这是需要转xml的实体类
java
import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableField;
import com.baomidou.mybatisplus.annotation.TableId;
import com.baomidou.mybatisplus.annotation.TableName;
import lombok.Data;
@Data
@TableName(value="productionissue")
public class ProductionIssue {
@TableId(value = "id", type = IdType.AUTO)
private Integer id;
@TableField("userid")
private String userId;
@TableField("title")
private String title;
@TableField("content")
private String content;
@TableField("orderNumber")
private String orderNumber;
@TableField("file")
private byte[] file;
@TableField("date")
private String date;
@TableField("sta")
private String sta;
}1.2）Xml中需要包含的字段
因为有些XML字段不在数据库对应的实体类中，所以需要额外建一个XML字段对应的实体类
java
import com.baomidou.mybatisplus.annotation.TableField;
import lombok.Data;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
@Data
@XmlRootElement
@XmlAccessorType(XmlAccessType.FIELD)
public class NewInc {
@XmlElement(name = "WSUSER")
private String wsUser;
@XmlElement(name = "WSPASSWORD")
private String wsPassword;
@XmlElement(name = "CREATOR")
private String userId;
@XmlElement(name = "CREATORCONTACT")
private String creatorContact;
@XmlElement(name = "SOURCE")
private String source;
@XmlElement(name = "SUMMARY")
private String title;
@XmlElement(name = "DESCRIPTION")
private String content;
@XmlElement(name = "PRIORITY")
private String priority;
@XmlElement(name = "URGENCY")
private String urgency;
@XmlElement(name = "REFLECTCANAL")
private String reflectCanal;
@XmlElement(name = "HAPPENTIME")
private String date;
@XmlElement(name = "ISEFFECTBUSINESS")
private String isEffectBusiness;
@XmlElement(name = "ISEFFECTBUSINESS")
private String effectSituation;
@XmlElement(name = "ISACCOUNT")
private String isAccount;
@XmlElement(name = "ISREGULATOR")
private String isRegulator;
@XmlElement(name = "ISBIGCUSTOMER")
private String isBigCustomer;
}1.3）设置根标签和属性序列化方式
@XmlRootElement和@XmlAccessorType是JAXB中用于控制Java对象与XML之间映射关系的注解。@XmlRootElement用于指定生成的XML的根标签名，而@XmlAccessorType用于指定属性的序列化方式。
java
import lombok.Data;
import javax.xml.bind.annotation.*;
import java.util.List;
@Data
@XmlRootElement(name="HAPPY") //根标签名
@XmlAccessorType(XmlAccessType.FIELD) //属性序列化
public class NewIncXml {
@XmlElement(name = "IN")
private List<NewInc> newIncs;
public List<NewInc> getNewIncs() {
return newIncs;
}
public void setNewIncs(List<NewInc> newIncs) {
this.newIncs = newIncs;
}
}1.4）使用JAXBContext和Marshaller进行转换
将从数据库中获取的NewInc对象转换为XML格式，并输出每个NewInc对象的XML表示。方便地将Java对象转换为XML数据进行处理或传输。
具体逻辑：
遍历List中的每个NewInc对象：
创建一个新的List对象newIncsOne，并将当前NewInc对象添加到这个List中。
创建一个NewIncXml对象xml，并设置其List newIncs属性为newIncsOne。
创建一个StringWriter对象writer用于将XML数据写入。
使用JAXBContext和Marshaller将NewIncXml对象转换为XML格式，并将结果写入到StringWriter中。
打印输出转换后的XML数据
java
package com.icbc.coresd.service.impl;
import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.icbc.coresd.entity.NewInc;
import com.icbc.coresd.entity.NewIncXml;
import com.icbc.coresd.entity.ProductionIssue;
import com.icbc.coresd.mapper.ProductionIssueMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
import java.io.StringWriter;
import java.util.ArrayList;
import java.util.List;
@Service
public class ProductionIssueServiceImpl {
@Autowired
ProductionIssueMapper productionIssueMapper;
/*
查询数据库productionissue表数据，设置到NewInc
*/
public List<NewInc> selectAll() {
LambdaQueryWrapper<ProductionIssue> queryWrapper = new LambdaQueryWrapper<>();
queryWrapper.eq(ProductionIssue::getSta,0 ).select(ProductionIssue::getTitle,ProductionIssue::getDate,ProductionIssue::getContent);
List<ProductionIssue> productionIssuesList = productionIssueMapper.selectList(queryWrapper);
List<NewInc> newIncList = new ArrayList<>();
for (ProductionIssue pi : productionIssuesList) {
NewInc newInc = new NewInc();
// 将User的属性映射到Product的属性
newInc.setUserId(pi.getUserId());
newInc.setTitle(pi.getTitle());
newInc.setContent(pi.getContent());
newInc.setDate(pi.getDate());
newInc.setWsUser("name");
newInc.setWsPassword("pass123");
newInc.setCreatorContact("user@mail");
newInc.setSource("固定");
newInc.setPriority("6");
newInc.setUrgency("02");
newInc.setReflectCanal("14");
newInc.setIsEffectBusiness("是");
newInc.setEffectSituation("file");
newInc.setIsAccount("否");
newInc.setIsRegulator("否");
newInc.setIsBigCustomer("否");
newIncList.add(newInc);
}
return newIncList;
}
public void build() {
List<NewInc> newIncsList = selectAll();
System.out.println(newIncsList.size());
for (int i = 0; i < newIncsList.size(); i++) {
NewInc newInc = newIncsList.get(i);
// 对取出的数据进行操作
List<NewInc> newIncsOne = new ArrayList<>();
newIncsOne.add(newInc);
NewIncXml xml = new NewIncXml();
xml.setNewIncs(newIncsOne);
StringWriter writer = null;
try {
JAXBContext context = JAXBContext.newInstance(NewIncXml.class);
Marshaller marshaller = context.createMarshaller();
marshaller.setProperty(Marshaller.JAXB_FRAGMENT, true);
marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
writer = new StringWriter();
writer.write("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n");
marshaller.marshal(xml, writer);
} catch (JAXBException e) {
e.printStackTrace();
}
System.out.println(writer.toString());
}
}
}