MyBatis 抛出 java.net.MalformedURLException: no protocol: com.hxstrive.**.UserMapper 错误

在使用 MyBatis 时，抛出“java.net.MalformedURLException: no protocol: com.hxstrive.mybatis.simple.UserMapper”错误。MyBatis 配置如下：

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
  "https://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <properties resource="database.properties"/>
    <environments default="MySqlDatabase" >
        <environment id="MySqlDatabase" >
            <transactionManager type="JDBC" />
            <dataSource type="POOLED">
                <property name="driver" value="${jdbc.driver}"/>
                <property name="url" value="${jdbc.url}"/>
                <property name="username" value="${jdbc.username}"/>
                <property name="password" value="${jdbc.password}"/>
            </dataSource>
        </environment>
    </environments>
    <mappers>
        <mapper url="com.hxstrive.mybatis.simple.UserMapper" />
    </mappers>
</configuration>

错误详细信息如下：

Exception in thread "main" org.apache.ibatis.exceptions.PersistenceException: 

### Error building SqlSession.

### The error may exist in com.hxstrive.mybatis.simple.UserMapper

### Cause: org.apache.ibatis.builder.BuilderException: Error parsing SQL Mapper Configuration. Cause: java.net.MalformedURLException: no protocol: com.hxstrive.mybatis.simple.UserMapper

    at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:23)

    at org.apache.ibatis.session.SqlSessionFactoryBuilder.build(SqlSessionFactoryBuilder.java:79)

    at org.apache.ibatis.session.SqlSessionFactoryBuilder.build(SqlSessionFactoryBuilder.java:63)

    at com.hxstrive.mybatis.simple.SimpleDemo.<init>(SimpleDemo.java:23)

    at com.hxstrive.mybatis.simple.SimpleDemo.main(SimpleDemo.java:15)

Caused by: org.apache.ibatis.builder.BuilderException: Error parsing SQL Mapper Configuration. Cause: java.net.MalformedURLException: no protocol: com.hxstrive.mybatis.simple.UserMapper

    at org.apache.ibatis.builder.xml.XMLConfigBuilder.parseConfiguration(XMLConfigBuilder.java:106)

    at org.apache.ibatis.builder.xml.XMLConfigBuilder.parse(XMLConfigBuilder.java:89)

    at org.apache.ibatis.session.SqlSessionFactoryBuilder.build(SqlSessionFactoryBuilder.java:77)

    ... 3 more

Caused by: java.net.MalformedURLException: no protocol: com.hxstrive.mybatis.simple.UserMapper

    at java.net.URL.<init>(URL.java:586)

    at java.net.URL.<init>(URL.java:483)

    at java.net.URL.<init>(URL.java:432)

    at org.apache.ibatis.io.Resources.getUrlAsStream(Resources.java:209)

    at org.apache.ibatis.builder.xml.XMLConfigBuilder.mapperElement(XMLConfigBuilder.java:322)

    at org.apache.ibatis.builder.xml.XMLConfigBuilder.parseConfiguration(XMLConfigBuilder.java:104)

    ... 5 more

Process finished with exit code 1

mybatis广告位

上面错误信息是因为配置 Mapper 资源时出现了错误，错误配置如下：

<mapper url="com.hxstrive.mybatis.simple.UserMapper" />

需要将 url 改为 resource，修改后的配置文件如下：

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
  "https://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <properties resource="database.properties"/>
    <environments default="MySqlDatabase" >
        <environment id="MySqlDatabase" >
            <transactionManager type="JDBC" />
            <dataSource type="POOLED">
                <property name="driver" value="${jdbc.driver}"/>
                <property name="url" value="${jdbc.url}"/>
                <property name="username" value="${jdbc.username}"/>
                <property name="password" value="${jdbc.password}"/>
            </dataSource>
        </environment>
    </environments>
    <mappers>
        <mapper resource="com/hxstrive/mybatis/simple/UserMapper.xml" />
    </mappers>
</configuration>

点击学习 MyBatis 教程，了解更多的 MyBatis 知识！