maven/ssm框架搭建

好久没有写java了，昨天学了下maven，不用手动的下载和添加jar包，实在是太方便。

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搭了下ssm。spring和mybatis集成时遇到太多bug:

bug1. 找不到dao对应的xml

Caused by: java.lang.IllegalArgumentException: Could not resolve resource location pattern [classpath:xin/redips/urls/mapper/*.xml]:

class path resource [xin/redips/urls/mapper/] cannot be resolved to URL because it does not exist

去target/classes文件夹下看了下还真是没有，maven没有把xml拷贝到classpath下，需要加上：

<build>
    ...
    <resources>
           <resource>
               <directory>src/main/java</directory>
               <includes>
                   <include>**/*.xml</include>
               </includes>
               <filtering>true</filtering>
           </resource>
 
           <resource>
                <directory>src/main/resources</directory>
                <includes>
                    <include>**/*.xml</include>
                    <include>**/*.properties</include>
                </includes>
                <filtering>true</filtering>
           </resource> 
 
      </resources>
  </build>

bug2.  Cannot load JDBC driver class 'com.mysql.jdbc.Driver  '

原因是配置文件多加了个空格。。

bug3. No suitable driver

网上说：Java.sql.SQLException: No suitable driver found for这个异常的发生，原因有二：

一，在可寻的路径下没有合适的数据库驱动。

二，数据库连接时提供的url不正确。

maven已经下好了jar包，所以不是原因一。而倒数第二个异常是：

我url明明写的是：

原来是pom.xml中定义的url覆盖了properties中定义的url.