项目day01(（tomcat访问出错，localhost拒绝访问，）解决办法把json版本号改下（2.2.3不行

#springmvc

    -提高开发效率

    -安全性\稳定性

##jsp响应流程：

请求-->DispatcherServlet

         -->HandlerMapping

    --->Controller

    --->返回mv

    --->jsp响应

##jSON响应流程

请求-->DispatcherServlet

         -->HandlerMapping

    --->Controller

    --->返回数据对象（string/user/list/Map)

    -->JSON响应

    怎么用？

    -导包jackson（出错，localhost拒绝访问，）解决办法把json版本号改下

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>cn.tedu</groupId>
  <artifactId>springmvc-json</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>war</packaging>
  <dependencies>
  	<dependency>
  		<groupId>org.springframework</groupId>
  		<artifactId>spring-webmvc</artifactId>
  		<version>3.2.8.RELEASE</version>
  	</dependency>
  	<dependency>
  		<groupId>com.fasterxml.jackson.core</groupId>
  		<artifactId>jackson-annotations</artifactId>
  		<version>2.4.4</version>
  	</dependency>
  	<dependency>
  		<groupId>com.fasterxml.jackson.core</groupId>
  		<artifactId>jackson-core</artifactId>
  		<version>2.4.4</version>
  	</dependency>
  	<dependency>
  		<groupId>com.fasterxml.jackson.core</groupId>
  		<artifactId>jackson-databind</artifactId>
  		<version>2.4.4</version>
  	</dependency>
  </dependencies>
</project>

配置web.xml文件：

  <servlet>
  	<servlet-name>mvc</servlet-name>
  	<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>	
  	
  	<init-param>
  	<param-name>contextConfigLocation</param-name>
         <!-- 可能会配置多个spring文件所以用-*区别开来 -->
  	<param-value>classpath:spring-*.xml</param-value>
  	</init-param>
  	<load-on-startup>1</load-on-startup>
  </servlet>
  
  
  <servlet-mapping>
  <servlet-name>mvc</servlet-name>
  <url-pattern>*.do</url-pattern>
  </servlet-mapping>

    -配置注解驱动(resource下 spring-mvc.xml）

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns:context="http://www.springframework.org/schema/context"
	xmlns:jdbc="http://www.springframework.org/schema/jdbc"
	xmlns:jee="http://www.springframework.org/schema/jee"
	xmlns:tx="http://www.springframework.org/schema/tx"
	xmlns:jpa="http://www.springframework.org/schema/data/jpa"
	xmlns:util="http://www.springframework.org/schema/util"
	xmlns:mvc="http://www.springframework.org/schema/mvc"
	xsi:schemaLocation="
		http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd
		http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.2.xsd
		http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.2.xsd
		http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd
		http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa-1.3.xsd     
		http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.2.xsd
		http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd">
		<!-- 启动注解驱动 -->
		<mvc:annotation-driven></mvc:annotation-driven>
		<!-- 组件扫描 -->
		<context:component-scan base-package="cn.tedu"></context:component-scan>
		

</beans>

    -Controller方法上增加@ResponseBody