html发送ajax请求必须注明发送的是json所以必须使用下面的模板

$.ajax({
            type:"POST",
            url:"",
            data:JSON.stringify(userList),
            contentType:"application/json;charset=utf-8"
        });

而spingboot在接受json数据时，必须要使用@RequestBody注解修饰

一、ajax发送的json数据是pojo类型的参数或者是pojo类型的集合，在java中有对应类
1.user类

public class User {
    private String name;
    private int age;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

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

2.html

<script>
        var userList = new Array();
        userList.push({name:"zhangsan",age:99});
        userList.push({name:"lisi",age:108});
        // $.get("/travel/user/quick9",{name:"test",age:18});
        $.ajax({
            type:"POST",
            url:"${pageContext.request.contextPath}/user/quick13",
            data:JSON.stringify(userList),
            contentType:"application/json;charset=utf-8"
        });
    </script>

3.后台接受数据

@RequestMapping("/quick13")
    @ResponseBody
    public void save13(@RequestBody List<User> userList){
        System.out.println(userList);
    }

二、ajax发送的json数据是多个类型的参数，在java中没有对应类
1.html

<script>
        var userList = new Array();
        userList.push({name:"zhangsan",age:99});
        userList.push({name:"lisi",age:108});
        var ajaxData={
            'userList':userList,
            'test':test2
        }
        // $.get("/travel/user/quick9",{name:"test",age:18});
        $.ajax({
            type:"POST",
            url:"${pageContext.request.contextPath}/user/quick13",
            data:JSON.stringify(ajaxData),
            contentType:"application/json;charset=utf-8"
        });
    </script>

2.后台接受数据

@RequestMapping("/quick13")
    @ResponseBody
    public void save13(@RequestBody Map<String,Object> map){
        List<User> userList = (List<User>) map.get("userList");
    }