angular的post請求,SpringMVC后台接收不到參數值的解決方案


這是我后台SpringMVC控制器接收isform參數的方法,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;

}

前台頁面發送一個post提交表單的請求

發現后台沒有取到值

后邊我想到的第一種方案是在控制器方法參數里加requestbody來接收json參數,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的值結果還是為null,

接着我又對比了下以前的項目中,接收post請求的參數,發現一個有趣的現象,

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",於是我更改了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現了原因,鏈接如下:

http://victorblog.com/2012/12/20/make-angularjs-http-service-behave-like-jquery-ajax/

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傳輸數據使用Content-Type: x-www-form-urlencodedand和類似於"foo=bar&baz=moe"的序列,然而AngularJS,傳輸數據使用Content-Type: application/json和{ "foo": "bar", "baz": "moe" }這樣的json序列。

所以下把Content-Type設置成x-www-form-urlencodedand之后,還需要轉換序列的格式,

下邊是我經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:

發現與jquery的post請求風格一致了,有木有!!!

看下后台的參數接收情況,

isform已經可以正常接收到參數了,大功告成!


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