java解析XML映射成对象实体

2021-07-24 06:55

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标签：create tst stat OLE rop 学生 enc ISE rac

使用JDK自带的

1.创建一个XML文件：config.xml

 1 xml version="1.0" encoding="utf-8"?>
 2 root >
 3 
 4     section target="system_user" description="用户信息" relation="" sourceIdentityColumn="id" targetIdentityColumn="source_id" isEnabled="true">
 5         table source="system_sync_pre_school_student" description="幼儿园学生信息" condition="" isEnabled="true">
 6             column source="id" target="source_id" type="STRING" description="源数据与目标数据的对应值" filter="" replace="" isEnabled="true"/>
 7             column source="name" target="name" type="STRING" description="姓名" filter="" replace="" isEnabled="true"/>
 8             column source="sex" target="sex" type="STRING" description="性别" filter="" replace="男=1,女=0" isEnabled="true"/>
 9             column source="student_id" target="open_id" type="STRING" description="用户唯一openId" filter="" replace="" isEnabled="true"/>
10 
11         table>
12     section>
13 
14     section target="system_user" description="用户信息" relation="" sourceIdentityColumn="id" targetIdentityColumn="source_id" isEnabled="true">
15         table source="system_sync_pre_school_student" description="幼儿园学生信息" condition="" isEnabled="true">
16             column source="id" target="source_id" type="STRING" description="源数据与目标数据的对应值" filter="" replace="" isEnabled="true"/>
17             column source="name" target="name" type="STRING" description="姓名" filter="" replace="" isEnabled="true"/>
18             column source="sex" target="sex" type="STRING" description="性别" filter="" replace="男=1,女=0" isEnabled="true"/>
19             column source="student_id" target="open_id" type="STRING" description="用户唯一openId" filter="" replace="" isEnabled="true"/>
20         table>
21     section>
22     
23 root>

2.写一个解析工具类:XMLUtil.java

 1 package org.example.util;
 2 
 3 import javax.xml.bind.JAXBContext;
 4 import javax.xml.bind.JAXBException;
 5 import javax.xml.bind.Marshaller;
 6 import javax.xml.bind.Unmarshaller;
 7 import java.io.*;
 8 
 9 /**
10  * 封装了XML转换成object，object转换成XML的代码
11  */
12 public class XMLUtil {
13     /**
14      * 将对象直接转换成String类型的 XML输出
15      */
16     public static String convertToXml(Object obj) {
17         // 创建输出流
18         StringWriter sw = new StringWriter();
19         try {
20             // 利用jdk中自带的转换类实现
21             JAXBContext context = JAXBContext.newInstance(obj.getClass());
22             Marshaller marshaller = context.createMarshaller();
23             // 格式化xml输出的格式
24             marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT,
25                     Boolean.TRUE);
26             marshaller.setProperty(Marshaller.JAXB_ENCODING, "UTF-8");
27             // 将对象转换成输出流形式的xml
28             marshaller.marshal(obj, sw);
29         } catch (JAXBException e) {
30             e.printStackTrace();
31         }
32         return sw.toString();
33     }
34 
35     /**
36      * 将对象根据路径写入指定的xml文件里
37      * @param obj
38      * @param path
39      * @return
40      */
41     public static void convertToXml(Object obj, String path) {
42         try {
43             // 利用jdk中自带的转换类实现
44             JAXBContext context = JAXBContext.newInstance(obj.getClass());
45 
46             Marshaller marshaller = context.createMarshaller();
47             // 格式化xml输出的格式
48             marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT,
49                     Boolean.TRUE);
50             marshaller.setProperty(Marshaller.JAXB_ENCODING, "GBK");
51             // 将对象转换成输出流形式的xml
52             // 创建输出流
53             FileWriter fw = null;
54             try {
55                 fw = new FileWriter(path);
56             } catch (IOException e) {
57                 e.printStackTrace();
58             }
59             marshaller.marshal(obj, fw);
60         } catch (JAXBException e) {
61             e.printStackTrace();
62         }
63     }
64 
65     /**
66      * 将String类型的xml转换成对象
67      */
68     public static Object convertXmlStrToObject(Class> clazz, String xmlStr) {
69         Object xmlObject = null;
70         try {
71             JAXBContext context = JAXBContext.newInstance(clazz);
72             // 进行将Xml转成对象的核心接口
73             Unmarshaller unmarshal = context.createUnmarshaller();
74             StringReader sr = new StringReader(xmlStr);
75             xmlObject = unmarshal.unmarshal(sr);
76         } catch (Exception e) {
77             e.printStackTrace();
78         }
79         return xmlObject;
80     }
81 
82     /**
83      * 将file类型的xml转换成对象
84      */
85     public static Object convertXmlFileToObject(Class> clazz, String xmlPath) {
86         Object xmlObject = null;
87         try {
88             JAXBContext context = JAXBContext.newInstance(clazz);
89             Unmarshaller unmarshaller = context.createUnmarshaller();
90             InputStreamReader isr=new InputStreamReader(new FileInputStream(xmlPath),"UTF-8");
91             xmlObject = unmarshaller.unmarshal(isr);
92         } catch (Exception e) {
93             e.printStackTrace();
94         }
95         return xmlObject;
96     }
97 
98 }

3.按照XML结构，写出将要映射的实体类：

　　1）Root.java

 1 package org.example.entity;
 2 
 3 import lombok.Data;
 4 
 5 import javax.xml.bind.annotation.XmlRootElement;
 6 import java.util.List;
 7 
 8 @Data
 9 //注解用于标记当前类是XML的根节点，name值为根节点名
10 @XmlRootElement(name = "root")
11 public class Root {
12 
13     private List section;
14 
15 }

　　2）Section.java

 1 package org.example.entity;
 2 
 3 import lombok.Setter;
 4 
 5 import javax.xml.bind.annotation.XmlAttribute;
 6 import javax.xml.bind.annotation.XmlTransient;
 7 import java.util.List;
 8 
 9 @Setter 
10 public class Section {
11 
12 
13     @XmlAttribute
14     private String target;
15     @XmlAttribute
16     private String description;
17     @XmlAttribute
18     private String relation;
19     @XmlAttribute
20     private String sourceIdentityColumn;
21     @XmlAttribute
22     private String targetIdentityColumn;
23     @XmlAttribute
24     private boolean isEnabled;
25 
26 
27     private List

table; 2829 @XmlTransient 30public String getTarget() { 31return target; 32 } 3334 @XmlTransient 35public String getDescription() { 36return description; 37 } 3839 @XmlTransient 40public String getRelation() { 41return relation; 42 } 4344 @XmlTransient 45public String getSourceIdentityColumn() { 46return sourceIdentityColumn; 47 } 4849 @XmlTransient 50public String getTargetIdentityColumn() { 51return targetIdentityColumn; 52 } 5354 @XmlTransient 55publicboolean isEnabled() { 56return isEnabled; 57 } 5859public List

getTable() { 60return table; 61 } 6263 @Override 64public String toString() { 65return "Section{" + 66 "target=‘" + target + ‘\‘‘ + 67 ", description=‘" + description + ‘\‘‘ + 68 ", relation=‘" + relation + ‘\‘‘ + 69 ", sourceIdentityColumn=‘" + sourceIdentityColumn + ‘\‘‘ + 70 ", targetIdentityColumn=‘" + targetIdentityColumn + ‘\‘‘ + 71 ", isEnabled=" + isEnabled + 72 ", table=" + table + 73 ‘}‘; 74 } 75 }

　　3）Table.java

 1 package org.example.entity;
 2 
 3 import lombok.Setter;
 4 
 5 import javax.xml.bind.annotation.XmlAttribute;
 6 import javax.xml.bind.annotation.XmlTransient;
 7 import java.util.List;
 8 
 9 @Setter
10 public class Table {
11 
12     @XmlAttribute
13     private String source;
14     @XmlAttribute
15     private String description;
16     @XmlAttribute
17     private String condition;
18     @XmlAttribute
19     private boolean isEnabled;
20 
21     private List column;
22 
23     @XmlTransient
24     public String getSource() {
25         return source;
26     }
27 
28     @XmlTransient
29     public String getDescription() {
30         return description;
31     }
32 
33     @XmlTransient
34     public String getCondition() {
35         return condition;
36     }
37 
38     @XmlTransient
39     public boolean isEnabled() {
40         return isEnabled;
41     }
42 
43     public List getColumn() {
44         return column;
45     }
46 
47     @Override
48     public String toString() {
49         return "Table{" +
50                 "source=‘" + source + ‘\‘‘ +
51                 ", description=‘" + description + ‘\‘‘ +
52                 ", condition=‘" + condition + ‘\‘‘ +
53                 ", isEnabled=" + isEnabled +
54                 ", column=" + column +
55                 ‘}‘;
56     }
57 }

　　4）Column.java

 1 package org.example.entity;
 2 
 3 import lombok.Setter;
 4 
 5 import javax.xml.bind.annotation.XmlAttribute;
 6 import javax.xml.bind.annotation.XmlTransient;
 7 
 8 @Setter
 9 public class Column {
10 
11     @XmlAttribute
12     private String source;
13     @XmlAttribute
14     private String target;
15     @XmlAttribute
16     private String type;
17     @XmlAttribute
18     private String description;
19     @XmlAttribute
20     private String filter;
21     @XmlAttribute
22     private String replace;
23     @XmlAttribute
24     private boolean isEnabled;
25 
26     @XmlTransient
27     public String getSource() {
28         return source;
29     }
30 
31     @XmlTransient
32     public String getTarget() {
33         return target;
34     }
35 
36     @XmlTransient
37     public String getType() {
38         return type;
39     }
40 
41     @XmlTransient
42     public String getDescription() {
43         return description;
44     }
45 
46     @XmlTransient
47     public String getFilter() {
48         return filter;
49     }
50 
51     @XmlTransient
52     public String getReplace() {
53         return replace;
54     }
55 
56     @XmlTransient
57     public boolean isEnabled() {
58         return isEnabled;
59     }
60 
61     @Override
62     public String toString() {
63         return "Column{" +
64                 "source=‘" + source + ‘\‘‘ +
65                 ", target=‘" + target + ‘\‘‘ +
66                 ", type=‘" + type + ‘\‘‘ +
67                 ", description=‘" + description + ‘\‘‘ +
68                 ", filter=‘" + filter + ‘\‘‘ +
69                 ", replace=‘" + replace + ‘\‘‘ +
70                 ", isEnabled=" + isEnabled +
71                 ‘}‘;
72     }
73 }

4.编写一个测试类

 1 package org.example;
 2 
 3 import org.example.entity.Root;
 4 import org.example.util.XMLUtil;
 5 
 6 public class Test {
 7 
 8     public static void main(String[] args) {
 9 
10         String path = "config.xml";
11         Root root = (Root) XMLUtil.convertXmlFileToObject(Root.class, path);
12         System.out.println(root);
13 
14     }
15 }

5.文件结构

　　技术图片

附：lambok 引用

1     
2     dependency>
3       groupId>org.projectlombokgroupId>
4       artifactId>lombokartifactId>
5       version>1.18.20version>
6       scope>providedscope>
7     dependency>

java解析XML映射成对象实体

标签：create tst stat OLE rop 学生 enc ISE rac

原文地址：https://www.cnblogs.com/DSH-/p/15006876.html

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