ssm框架下开发RESTful json简单实例

1.搭建好ssm框架添加将结果转为json数据返回的jar包jackson-annotations-2.8.4.jarjackson-core-2.8.4.jarjackson-databind-2.8.4.jar如果不添加这3个jar包，会输出错误如下：java.lang.IllegalArgumentException: No converter found for return value of type web.xml修改：<url-pattern>/</url-pattern>springmvc.xml添加资源映射    <!-- 静态资源映射  -->    <mvc:resources location="/js/" mapping="/js/**" />    <mvc:resources location="/css/" mapping="/css/**" />    <mvc:resources location="/img/" mapping="/img/**" />    <mvc:resources location="/fonts/" mapping="/fonts/**" />2. 编写mapper和service接口以及实现类ItemsMapperCustom.xml添加：    <select id="findItemsById" parameterType="java.lang.Integer" resultType="com.yf.ssm.po.ItemsCustom">        select items.* from items        <where>            items.id=#{id}        </where>     </select>ItemsMapperCustom.java添加代码://根据id查询商品public ItemsCustom findItemsById(Integer id) throws Exception;ItemsService添加接口：//查询商品public ItemsCustom findItemsById(Integer id) throws Exception;ItemsServiceImpl添加接口实现代码:@Overridepublic ItemsCustom findItemsById(Integer id) throws Exception {return itemsMapperCustom.findItemsById(id);}3. controller里面添加控制器映射代码:@RequestMapping("/itemsview/{id}")public @ResponseBody ItemsCustom findItemsById(@PathVariable("id") Integer id) throws Exception{ItemsCustom itemsCustom =  itemsService.findItemsById(id);return itemsCustom;}"/itemsview/{id}"这里的｛id｝传入到(@PathVariable("id") Integer id) 的id里面。如果有多个参数，例如增加name字段@RequestMapping("/itemsview/{id}/{name}")(@PathVariable("id") Integer id ,  @PathVariable("name") String diffname )return itemsCustom会经过@ResponseBody注解转换为json数据格式4. 测试，浏览器输入 http://localhost:8080/ssm/itemsview/1

{"id":1,"name":"果汁机","price":3000.0,"pic":null,"createtime":1422940972340,"detail":"果汁营养好！"}