SpringMVC----Jackson运用

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

@RequestMapping("/doMapJsonString")
    @ResponseBody
    public Map<String,Object> doMapJsonString(){
        Map<String, Object> map = new LinkedHashMap<>();
        map.put("id", 100);
        map.put("name", "BeiJing");
        return map;
        //系统底层会基于返回值查找对应的转换,将对象转换为指定格式的字符串
    }
    
    @RequestMapping("/doMapJsonString02")
    @ResponseBody
    public List<Map<String,Object>> doMapJsonString02(){
        List<Map<String,Object>> list = new ArrayList<>();
        Map<String, Object> map = new LinkedHashMap<>();
        map.put("id", 100);
        map.put("name", "BeiJing");
        list.add(map);
        map = new LinkedHashMap<>();
        map.put("id", 200);
        map.put("name", "ShangHai");
        list.add(map);
        return list;
        //系统底层会基于返回值查找对应的转换,将对象转换为指定格式的字符串
    }

[{"id":100,"name":"BeiJing"},{"id":200,"name":"ShangHai"}]