Java实体在xml和json之间相互转换

@JsonProperty：把属性的名称序列化成另一个名称
@JsonFormat：日期格式转换（例如：@JsonFormat(timezone=“GTM+8”,pattern=“yyyy-MM-dd HH:mm:ss”)）
@JsonIgnoreProperties：忽略类的某个属性（作用于类，例如：@JsonIgnoreProperties({“属性1”,“属性2”})）
@JsonIgnore：忽略类的某个属性（作用于属性，直接在属性加注解即可）
@JacksonXmlElementWrapper：可用于指定List等集合类，设置外围标签名与是否设置外围标签
@JacksonXmlProperty：指定包装标签名，或者指定标签内部属性名
@JacksonXmlRootElement：指定生成xml根标签的名字
@JacksonXmlText：指定当前值，没有xml标签包裹
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实体类(任意类型)解析为xml的字符串
String writeValueAsString(Object var1);
把字符串转换为实体类
<T> T readValue(String var1, Class<T> var2);
读取xml字符串为json格式
JsonNode readTree(String var1);
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获取json中的某个节点值
JsonNode get(String var1);
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@Data
public class Student {
    private String studentNo;
    private String studentName;
}
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public class Demo {

    //创建XmlMapper对象，用于实体与json和xml之间的相互转换
    private static final XmlMapper XML_MAPPER = new XmlMapper();

    public static void main(String[] args) throws Exception {
        Student s = new Student();
        s.setStudentNo("202101001");
        s.setStudentName("张三");

        //实体类解析为xml的字符串（理论上可以将任意类型解析为xml字符串）
        String xmlStr = XML_MAPPER.writeValueAsString(s);
        System.out.println(xmlStr);//<Student xmlns=""><studentNo>202101001</studentNo><studentName>张三</studentName></Student>

        //把字符串转换为实体类
        Student student = XML_MAPPER.readValue(xmlStr, Student.class);
        System.out.println(student);//Student(studentNo=202101001, studentName=张三)

        //读取xml字符串为json格式
        JsonNode jsonNode = XML_MAPPER.readTree(xmlStr);
        System.out.println(jsonNode);//{"studentNo":"202101001","studentName":"张三"}
        
        //获取json中的某一个节点值
        JsonNode studentNo = jsonNode.get("studentNo");
        System.out.println(studentNo);//"202101001"
    }
}    
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import com.fasterxml.jackson.annotation.JsonIgnore;
import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.dataformat.xml.annotation.JacksonXmlElementWrapper;
import com.fasterxml.jackson.dataformat.xml.annotation.JacksonXmlProperty;
import lombok.Data;
import java.util.List;

/**
 * @author 二师兄想吃肉
 * @version V1.0
 * @Title:
 * @Description:
 * @date 2021/1/10 21:40
 */
@Data
@JsonIgnoreProperties({"ignore"})//忽略类的某个属性
public class Clazz {

    //把属性的名称序列化成另一个名称
    @JsonProperty("CLAZZNO")
    private String clazzNo;

    //指定包装标签名，或者指定标签内部属性名
    @JacksonXmlProperty(localName = "CLAZZNAME")
    private String clazzName;

    //忽略类的某个属性
    @JsonIgnore
    private String ignore;

    private Teacher teacher;

 //不使用外围标签
//  @JacksonXmlElementWrapper(useWrapping = false)
    //指定外围标签名
    @JacksonXmlElementWrapper(localName = "studentList")
    //指定标签名
    @JacksonXmlProperty(localName = "student")
    private List<Student> studentList;
}

@Data
class Teacher {
    private String teacherName;
    private String teacherSex;
}

@Data
class Student {
    private String studentNo;
    private String studentName;
}
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import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.dataformat.xml.XmlMapper;
import java.util.ArrayList;
import java.util.List;

/**
 * @author 二师兄想吃肉
 * @version V1.0
 * @Title:
 * @Description:
 * @date 2021/1/10 21:43
 */
public class Demo {

    //创建XmlMapper对象，用于实体与json和xml之间的相互转换
    private static final XmlMapper XML_MAPPER = new XmlMapper();
    
    public static void main(String[] args) throws Exception{
        Clazz c = new Clazz();
        c.setClazzNo("201802");
        c.setClazzName("三年级2班");
        c.setIgnore("这是被忽略的属性");
            Teacher t = new Teacher();
            t.setTeacherName("宋老师");
            t.setTeacherSex("男");
        c.setTeacher(t);
            List<Student> students = new ArrayList<>();
                Student s1 = new Student();
                s1.setStudentNo("202101001");
                s1.setStudentName("张三");
                Student s2 = new Student();
                s2.setStudentNo("202101002");
                s2.setStudentName("李四");
            students.add(s1);
            students.add(s2);
        c.setStudentList(students);

        //实体类解析为xml的字符串
        String xmlStr = XML_MAPPER.writeValueAsString(c);
        System.out.println(xmlStr);

        //把某一类型的东西转换为实体类
        Clazz clazz = XML_MAPPER.readValue(xmlStr, Clazz.class);
        System.out.println(clazz);
        //取出Clazz类的studentList属性并打印
        List<Student> studentList = clazz.getStudentList();
        System.out.println(studentList);

        //读取xml字符串为json格式
        JsonNode jsonNode = XML_MAPPER.readTree(xmlStr);
        System.out.print(jsonNode);
    }
}
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<Clazz xmlns=""><teacher><teacherName>宋老师</teacherName><teacherSex>男</teacherSex></teacher><CLAZZNO>201802</CLAZZNO><CLAZZNAME>三年级2班</CLAZZNAME><studentList><student><studentNo>202101001</studentNo><studentName>张三</studentName></student><student><studentNo>202101002</studentNo><studentName>李四</studentName></student></studentList></Clazz>
Clazz(clazzNo=201802, clazzName=三年级2班, ignore=null, teacher=Teacher(teacherName=宋老师, teacherSex=男), studentList=[Student(studentNo=202101001, studentName=张三), Student(studentNo=202101002, studentName=李四)])
[Student(studentNo=202101001, studentName=张三), Student(studentNo=202101002, studentName=李四)]
{"teacher":{"teacherName":"宋老师","teacherSex":"男"},"CLAZZNO":"201802","CLAZZNAME":"三年级2班","studentList":{"student":{"studentNo":"202101002","studentName":"李四"}}}
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