Springmvc处理ajax请求并返回json数据

①在springmvc方法上添加@ResponseBody注解,springmvc会将数据转换成json并返回;

@ResponseBody //指定返回json数据,不跳转页面

@RequestMapping("/list")

public List<User> list(User user){

System.out.println("获取到异步请求数据:"+user);

//todo 根据条件做数据库查询,返回结果集合

ArrayList<User> users=new ArrayList<>();

users.add(new User(1,"james",18,"男"));

users.add(new User(2,"姚明",40,"男"));

users.add(new User(3,"科比",46,"男"));

return users;

}

list.jsp页面中代码为:

<body>

<input type="button" id="btn" value="异步加载数据"/>

<script src="${pageContext.request.contextPath}/static/js/jquery-3.2.1.min.js"></script>

<script>

$(function ($) {

$("#btn").click(function () {

$.ajax({

url:"${pageContext.request.contextPath}/list",

type:"post",

data:{"name":"james","age":18},

dataType:"json",

success:function (result) {

alert("请求成功!")

console.log(result)

}

})

})

})

</script>

</body>

②如果contentType=”application/json”时,在方法的参数前添加@RequestBody注解,获取传递的json字符串,并封装到对象中;

@ResponseBody //指定返回json数据,不跳转页面

@RequestMapping("/list")

public List<User> list(@RequestBody(required=false) User user){

System.out.println("获取到异步请求数据:"+user);

//todo 根据条件做数据库查询,返回结果集合

ArrayList<User> users=new ArrayList<>();

users.add(new User(1,"james",18,"男"));

users.add(new User(2,"姚明",40,"男"));

users.add(new User(3,"科比",46,"男"));

return users;

}

list.jsp页面中代码为:

<body>

<input type="button" id="btn" value="异步加载数据"/>

<script src="${pageContext.request.contextPath}/static/js/jquery-3.2.1.min.js"></script>

<script>

$(function ($) {

$("#btn").click(function () {

var jsonObj={"name":"james","age":18};

$.ajax({

url:"${pageContext.request.contextPath}/list",

type:"post",

data:JSON.stringify(jsonObj),//json字符串 将json对象转化为字符串

dataType:"json",

contentType:"application/json",//指定以json方式传输数据

success:function (result) {

alert("请求成功!")

console.log(result)

}

})

})

})

</script>

</body>

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