整合SSM时遇到的错误

水深无声 2022-01-15 06:43 287阅读 0赞

1.  **web.xml is missing and <failOnMissingWebXml> is set to true。**

解决：右击项目——>Java EE Tools——>Generate Deployment Descriptor Stub.然后系统会在src/main/webapp/WEB-INF文件加下创建web.xml文件。错误解决！

1.  **关于mybatis-generator使用报找不到driverClass的解决**

解决：将sql驱动包是写在plugin里面。

<plugin>
    	<groupId>org.mybatis.generator</groupId>
    	<artifactId>mybatis-generator-maven-plugin</artifactId>
    	<version>1.3.2</version>
    	<configuration>
    		<verbose>true</verbose>
    		<overwrite>true</overwrite>
    	</configuration>
    	<dependencies>
    		
    		<dependency>
    			<groupId>mysql</groupId>
    			<artifactId>mysql-connector-java</artifactId>
    			<version>5.1.40</version>
    		</dependency>
    	</dependencies>
    </plugin>

1.  **Failed to start component \[StandardEngine\[Tomcat\].StandardHost\[localhost\]\]**  
    **invalid LOC header (bad signature)**

解决：把提示的jar包从磁盘中删掉让maven重新下载就解决了。

1.  **No qualifying bean of type ‘com.ronybo.mapper.UserMapper’ available: expected at least 1 bean which qualifies as autowire candidate.**

我之前只加载了applicationContext-mvc.xml，没有加载applicationContext-mybatis.xml  
解决：web.xml忘记加Spring容器加载所有的配置文件的路径

<context-param>
    		<param-name>contextConfigLocation</param-name>
    		<param-value>classpath*:applicationContext-*.xml</param-value>
    	</context-param>

这样写回加载类路径下所有的以applicationContext-开头的配置文件。

1.  **Error creating bean with name ‘dataSource’ defined in class path resource \[applicationContext-mybatis.xml\]: Error setting property values;**

解决：缺mysql的jar包。

<dependency>
    	<groupId>mysql</groupId>
    	<artifactId>mysql-connector-java</artifactId>
    	<version>5.1.40</version>
    </dependency>

1.  **No converter found for return value of type**

解决：加入json转换器

<mvc:annotation-driven>
    	<mvc:message-converters register-defaults="true">
    		<bean class="com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter">
    			<property name="supportedMediaTypes">
    				<list>
    					<value>text/html;charset=UTF-8</value>
    					<value>application/json;charset=UTF-8</value>
    				</list>
    			</property>
    		</bean>
    	</mvc:message-converters>
    </mvc:annotation-driven>

1.  415错误

解决：在ajax请求中加入`contentType: 'application/json; charset=UTF-8',`

1.  以前一直以为@RequestBody接收的是一个JSON对象，才发现它接收的是一个JSON对象的**字符串**，所以在ajax发送数据的时候需要将data转为字符串再传到后台。

ajax：data:JSON.stringify(data),  
controller：public User getUser(@RequestBody User user)\{\}