解決SSM報錯：No converter found for return value of type: class com.sh.vo.Message

No converter found for return value of type: class com.sh.vo.Message
1.原因：這是因爲springmvc默認是沒有對象轉換成json的轉換器的，需要手動添加jackson依賴。

2.解決步驟：手動添加jackson依賴到pom.xml文件中

<properties>
    <jackson.version>2.5.4</jackson.version>
  </properties> 

  <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-core</artifactId>
      <version>${jackson.version}</version>
    </dependency>
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-databind</artifactId>
      <version>${jackson.version}</version>
    </dependency>

如果還是沒有解決，則進行以下步驟，在springmvc配置文件中進行如下配置

<mvc:annotation-driven>
     <mvc:message-converters>
            <bean class="org.springframework.http.converter.StringHttpMessageConverter"/>
            <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter"/>
   </mvc:message-converters>
</mvc:annotation-driven>