content-type 与spring boot 控制器的值注入关系

content-type = ‘application/x-www-form-urlencoded’ (不支持@RequestBody annotation)

前端传值template string为如下形式

var http = new XMLHttpRequest();
var url = 'get_data.php';
var params = 'orem=ipsum&name=binny';
http.open('POST', url, true);

//Send the proper header information along with the request
http.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');

http.onreadystatechange = function() {//Call a function when the state changes.
    if(http.readyState == 4 && http.status == 200) {
        alert(http.responseText);
    }
}
http.send(params);

var params = ‘orem=ipsum&name=binny’;

content-type = ‘application/json’ (支持@RequestBody annotation)

let request = new XMLHttpRequest()
let url = "http://localhost:8080/user/regist";
request.open("POST", url, true)
request.setRequestHeader('Content-type','application/json; charset=utf-8');
let formData = {'userName=' + user.value + '&' + 'password=' + passwd.value};
formData.userName =  user.value
formData.password = passwd.value
console.log(JSON.stringify(formData))
request.send(formData)