6.Spring MVC SSM整合问题总结

1.Cannot find class [org.springframework.http.converter.json.MappingJacksonHttpMessageConverter] for bean with name 'mappingJacksonHttpMessageConverter' defined in class path resource [config/spring-mvc.xml];

在springmvc.xm把org.springframework.http.converter.json.MappingJacksonHttpMessageConverter
改为
org.springframework.http.converter.json.MappingJackson2HttpMessageConverter

[org.springframework.web.context.ContextLoader]Context initialization failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter#0' 
... ...
Caused by: org.springframework.beans.factory.CannotLoadBeanClassException: Cannot find class [org.springframework.http.converter.json.MappingJacksonHttpMessageConverter] for bean with name 'org.springframework.http.converter.json.MappingJacksonHttpMessageConverter#2aa148c0' 
... ...
Caused by: java.lang.ClassNotFoundException: org.springframework.http.converter.json.MappingJacksonHttpMessageConverter
    ... ...

2.原因：

　　Spring4.0后jackson依赖包不一样导致

3.解决方案

Spring 4.x.x版本后使用org.springframework.http.converter.json.MappingJackson2HttpMessageConverter所对应的jar

在maven配置jackson依赖包

<dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-core</artifactId>
            <version>2.8.5</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>2.8.5</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-annotations</artifactId>
            <version>2.8.5</version>
        </dependency>

Spring 3.x.x版本后使用org.springframework.http.converter.json.MappingJacksonHttpMessageConverter

所依赖的jackson包

<dependency>
          <groupId>org.codehaus.jackson</groupId>
           <artifactId>jackson-mapper-asl</artifactId>
           <version>1.9.13</version>
</dependency>