這是我后臺SpringMVC控制器接收isform參數(shù)的方法,只是簡單的打出它的值:
@RequestMapping(method = RequestMethod.POST) @ResponseBody public Map<String, Object> save( @RequestParam(value = "isform", required = false) String isform) { System.out.println("isform value: " + isform); return null; }
前臺頁面發(fā)送一個post提交表單的請求
發(fā)現(xiàn)后臺沒有取到值
后邊我想到的第一種方案是在控制器方法參數(shù)里加requestbody來接收json參數(shù),改成如下:
@RequestMapping(method = RequestMethod.POST) @ResponseBody public Map<String, Object> save( @RequestParam(value = "isform", required = false) @RequestBody String isform) { System.out.println("isform value: " + isform); return null; }
但是isform的值結(jié)果還是為null,
接著我又對比了下以前的項目中,接收post請求的參數(shù),發(fā)現(xiàn)一個有趣的現(xiàn)象,
下邊是Angular的默認請求頭:
$httpProvider.defaults.headers.post: (header defaults for POST requests)
Content-Type: application/json
$httpProvider.defaults.headers.put(header defaults for PUT requests)
Content-Type: application/json
其中Angular的post和put都是application/json,
而jquery的post請求的"Content-Type"默認為" application/x-www-form-urlencoded",于是我更改了angular的默認Content-Type,
app.config(function($httpProvider) { $httpProvider.defaults.headers.put['Content-Type'] = 'application/x-www-form-urlencoded'; $httpProvider.defaults.headers.post['Content-Type'] = 'application/x-www-form-urlencoded'; });
接下來的請求body變成了這樣,但是后邊還是沒有取到isform的值,
又查了半天,在一個老外的博客上發(fā)現(xiàn)了原因:
By default, jQuery transmits data using Content-Type: x-www-form-urlencoded and the familiar foo=bar&baz=moe serialization. AngularJS, however, transmits data using Content-Type: application/json and { "foo": "bar", "baz": "moe" } JSON serialization
自己翻譯了:
默認情況下,jQuery傳輸數(shù)據(jù)使用Content-Type: x-www-form-urlencodedand和類似于"foo=bar&baz=moe"的序列,然而AngularJS,傳輸數(shù)據(jù)使用Content-Type: application/json和{ "foo": "bar", "baz": "moe" }這樣的json序列。
所以下把Content-Type設(shè)置成x-www-form-urlencodedand之后,還需要轉(zhuǎn)換序列的格式,
下邊是我經(jīng)過老外實踐而自己測試過的最終方案:
app.config(function($httpProvider) { $httpProvider.defaults.headers.put['Content-Type'] = 'application/x-www-form-urlencoded'; $httpProvider.defaults.headers.post['Content-Type'] = 'application/x-www-form-urlencoded'; // Override $http service's default transformRequest $httpProvider.defaults.transformRequest = [function(data) { /** * The workhorse; converts an object to x-www-form-urlencoded serialization. * @param {Object} obj * @return {String} */ var param = function(obj) { var query = ''; var name, value, fullSubName, subName, subValue, innerObj, i; for (name in obj) { value = obj[name]; if (value instanceof Array) { for (i = 0; i < value.length; ++i) { subValue = value[i]; fullSubName = name + '[' + i + ']'; innerObj = {}; innerObj[fullSubName] = subValue; query += param(innerObj) + '&'; } } else if (value instanceof Object) { for (subName in value) { subValue = value[subName]; fullSubName = name + '[' + subName + ']'; innerObj = {}; innerObj[fullSubName] = subValue; query += param(innerObj) + '&'; } } else if (value !== undefined && value !== null) { query += encodeURIComponent(name) + '=' + encodeURIComponent(value) + '&'; } } return query.length ? query.substr(0, query.length - 1) : query; }; return angular.isObject(data) && String(data) !== '[object File]' ? param(data) : data; }];});
在angular模塊中添加以上代碼,我們來看下效果:
發(fā)現(xiàn)與jquery的post請求風格一致了,有木有!!!
看下后臺的參數(shù)接收情況,
isform已經(jīng)可以正常接收到參數(shù)了,大功告成!
以上就是angular的post請求后臺接收參數(shù)為null的解決方案,希望對大家的學(xué)習(xí)有所幫助。