ssm整合-错误2

 1 警告: No mapping found for HTTP request with URI [/management] in DispatcherServlet with name 'dispatcherServlet'
 5月 24, 2018 1:05:48 下午 org.springframework.web.servlet.PageNotFound noHandlerFound
 警告: No mapping found for HTTP request with URI [/management] in DispatcherServlet with name 'dispatcherServlet'
 5月 24, 2018 1:05:55 下午 org.apache.catalina.startup.HostConfig deployDirectory
 信息: Deploying web application directory D:\java\tomcat\apache-tomcat-7.0.86\webapps\manager
 5月 24, 2018 1:05:55 下午 org.apache.catalina.startup.TldConfig execute
 信息: At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.
 5月 24, 2018 1:05:55 下午 org.apache.catalina.startup.HostConfig deployDirectory
 信息: Deployment of web application directory D:\java\tomcat\apache-tomcat-7.0.86\webapps\manager has finished in 82 ms
 5月 24, 2018 1:06:05 下午 org.springframework.web.servlet.PageNotFound handleNoSuchRequestHandlingMethod
 警告: No matching handler method found for servlet request: path '/book', method 'GET', parameters map[[empty]]
 5月 24, 2018 1:06:11 下午 org.springframework.web.servlet.PageNotFound noHandlerFound
 警告: No mapping found for HTTP request with URI [/management/book/list] in DispatcherServlet with name 'dispatcherServlet'

原因是

1、配置文件中路径的问题，读dispatchServlet时将jsp文件一起读入核心控制器，原来是：

  <servlet>
     <servlet-name>dispatcherServlet</servlet-name>
     <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
     <init-param>
       <param-name>contextConfigLocation</param-name>
       <param-value>classpath:spring.xml</param-value>
     </init-param>
   </servlet>
   <servlet-mapping>
     <servlet-name>dispatcherServlet</servlet-name>
     <url-pattern>/*</url-pattern>
   </servlet-mapping>

修改为

  <servlet>
     <servlet-name>dispatcherServlet</servlet-name>
     <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
     <init-param>
       <param-name>contextConfigLocation</param-name>
       <param-value>classpath:spring.xml</param-value>
     </init-param>
   </servlet>
   <servlet-mapping>
     <servlet-name>dispatcherServlet</servlet-name>
     <url-pattern>*.do</url-pattern>
   </servlet-mapping>

2、RESTful约束下，requestMapping注解使用有效，getMapping注解无效

查找得知为没有设置json的支持包，

Java下常见的Json类库有Gson、JSON-lib和Jackson等，Jackson相对来说比较高效，在项目中主要使用Jackson进行JSON和Java对象转换。

在pom.xml文件中配置依赖：

 <dependency>
     <groupId>com.fasterxml.jackson.core</groupId>
     <artifactId>jackson-databind</artifactId>
     <version>2.8.3</version>
 </dependency>

再次启动Tomcat成功