1 Spring5 自定义标签开发

spring5 自定义脚本开发步骤

1 定义bean，

public class User {
 
    private String id;
 
    private String userName;
 
    private String email;
 
    private String password;
 
 
    public String getId() {
        return id;
    }
 
    public void setId(String id) {
        this.id = id;
    }
 
    public String getUserName() {
        return userName;
    }
 
    public void setUserName(String userName) {
        this.userName = userName;
    }
 
    public String getEmail() {
        return email;
    }
 
    public void setEmail(String email) {
        this.email = email;
    }
 
    public String getPassword() {
        return password;
    }
 
    public void setPassword(String password) {
        this.password = password;
    }
}

2 自定义 BeanDefinitionParser，继承  AbstractSingleBeanDefinitionParser

import org.springframework.beans.factory.support.BeanDefinitionBuilder;
import org.springframework.beans.factory.xml.AbstractSingleBeanDefinitionParser;
import org.springframework.util.StringUtils;
import org.w3c.dom.Element;
 
public class UserBeanDefinitionParser extends AbstractSingleBeanDefinitionParser {
 
    protected Class<?> getBeanClass(Element element){
        return User.class;
    }
 
    protected void doParse(Element element, BeanDefinitionBuilder builder){
        String userName = element.getAttribute("userName");
        String email = element.getAttribute("email");
        String password = element.getAttribute("password");
        String id = element.getAttribute("id");
 
 
        if (StringUtils.hasText(userName)){
            builder.addPropertyValue("userName", userName);
        }
 
        if (StringUtils.hasText(email)){
            builder.addPropertyValue("email", email);
 
        }
 
        if (StringUtils.hasText(password)){
            builder.addPropertyValue("password", password);
        }
 
        if (StringUtils.hasText(id)){
            builder.addPropertyValue("id", id);
        }
    }
}

3 定义 NameSpaceHandler， 继承 NamespaceHandlerSupport，

import org.springframework.beans.factory.xml.NamespaceHandlerSupport;
 
public class UserNameSpaceHandler extends NamespaceHandlerSupport {
    @Override
    public void init() {
        registerBeanDefinitionParser("user", new UserBeanDefinitionParser());
    }
}

4 自定义配置文件，在resource/META-INF 目录下，新建spring.handlers , spring.schemas , user.xsd 文件。

spring.handlers 文件内容如下：

http\://www.gientech.com/schema/user=com.gientech.selftag.UserNameSpaceHandler

spring.schemas 文件内容如下：

http\://www.gientech.com/schema/user.xsd=META-INF/user.xsd

spring.xsd 文件内容如下：

<?xml version="1.0" encoding="UTF-8"?>
<schema xmlns="http://www.w3.org/2001/XMLSchema"
        targetNamespace="http://www.gientech.com/schema/user"
        xmlns:tns="http://www.gientech.com/schema/user"
        elementFormDefault="qualified">
 
    <element name="user">
        <complexType>
            <attribute name="id" type="string"></attribute>
            <attribute name="userName" type="string"></attribute>
            <attribute name="email" type="string"></attribute>
            <attribute name="password" type="string"></attribute>
        </complexType>
    </element>
</schema>

5 spring-content.xml 引入命名空间，使用新标签配置bean

6 启动Spring 项目, 获取bean的值，

7 打印结果如下：

自定义标签开发完成，按照步骤可正确开发自定义标签。