这是我后台SpringMVC控制器接收isform参数的方法,只是简单的打出它的值:
@RequestMapping(method = RequestMethod.POST)@ResponseBodypublic Map<String, Object> save(@RequestParam(value = "isform", required = false) String isform) {System.out.println("isform value: " + isform);return null;}
前台页面发送一个post提交表单的请求
发现后台没有取到值
后边我想到的第一种方案是在控制器方法参数里加requestbody来接收json参数,改成如下:
@RequestMapping(method = RequestMethod.POST)@ResponseBodypublic Map<String, Object> save(@RequestParam(value = "isform", required = false) @RequestBody String isform) {System.out.println("isform value: " + isform);return null;}
但是isform的值结果还是为null,
接着我又对比了下以前的项目中,接收post请求的参数,发现一个有趣的现象,
下边是Angular的默认请求头:
$httpProvider.defaults.headers.post: (header defaults for POST requests)
Content-Type: application/json
$httpProvider.defaults.headers.put(header defaults for PUT requests)
Content-Type: application/json
其中Angular的post和put都是application/json,
而jquery的post请求的"Content-Type"默认为" application/x-www-form-urlencoded",于是我更改了angular的默认Content-Type,
app.config(function($httpProvider) {$httpProvider.defaults.headers.put['Content-Type'] = 'application/x-www-form-urlencoded';$httpProvider.defaults.headers.post['Content-Type'] = 'application/x-www-form-urlencoded';});
接下来的请求body变成了这样,但是后边还是没有取到isform的值,
又查了半天,在一个老外的博客上发现了原因: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
自己翻译了:
默认情况下,jQuery传输数据使用Content-Type: x-www-form-urlencodedand和类似于"foo=bar&baz=moe"的序列,然而AngularJS,传输数据使用Content-Type: application/json和{ "foo": "bar", "baz": "moe" }这样的json序列。
所以下把Content-Type设置成x-www-form-urlencodedand之后,还需要转换序列的格式,
下边是我经过老外实践而自己测试过的最终方案:
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模块中添加以上代码,我们来看下效果:
发现与jquery的post请求风格一致了,有木有!!!
看下后台的参数接收情况,
isform已经可以正常接收到参数了,大功告成!
以上就是angular的post请求后台接收参数为null的解决方案,希望对大家的学习有所帮助。