在前后端通信时，如果前端上传的数据为复杂对象，例如包含List，Map，String等复合型数据时候，在前端处理数据时也必须和后端一一对应。

前端发起请求

<script type="application/javascript">
    $(function(){
        var user = {}
        var arr = new Array();
        arr.push(1);
        arr.push(2);
        var map = {a: 123, b:898};
        user.name = "张三";
        user.map = map;
        user.list = arr;
        var data = JSON.stringify(user);
        console.log(data);

        $.ajax({
            type:'POST',
            url:'/bb/aj',
            data:data,
            contentType: 'application/json',
            success:function(data){
                alert(data)
            }
        })

    })
</script>

后端Java Bean映射

public class User extends BaseEntity {

    private String name = null;
    private Map<String, Object> map = null;
    private List<String> list = null;

	 ...省略getter/setter

    @Override
    public String toString() {
        return "User{" +
                "name='" + name + '\'' +
                ", map=" + map +
                ", list=" + list +
                '}';
    }
}

后端Controller接收数据并处理

@Controller
@RequestMapping(value = "/bb")
public class BBController extends BaseSpringController {

    @ResponseBody
    @RequestMapping(value = "/aj")
    public User addJson(@RequestBody User user){
        System.out.println(user);
        return user;
    }

}