如何用 AngularJS POST 二进制文件（附上传 DEMO）
How to POST binary files with AngularJS (with upload DEMO)
无法通过 angular post 调用
发送文件
我正在尝试 post .mp4 通过 ionic 1 和 angular 1 将一些数据归档。当 post 通过 POSTMAN 时，它是很好，工作正常。我的申请中 Success = false。
在 POSTMAN 中，没有 headers，数据如下，
服务 url 与 POST 请求 http://services.example.com/upload.php
body 表单数据
j_id = 4124, type = text
q_id = 6, type = text
u_id = 159931, type = text
file = demo.mp4, type = file
在我的应用程序中：
$rootScope.uploadQuestion = function () {
var form = new FormData();
form.append("j_id", "4124");
form.append("q_id", "6");
form.append("u_id", "159931");
form.append("file", $rootScope.videoAns.name); //this returns media object which contain all details of recorded video
return $http({
method: 'POST',
headers: { 'Content-Type': 'multipart/form-data' }, // also tried with application/x-www-form-urlencoded
url: 'http://services.example.com/upload.php',
// url: 'http://services.example.com/upload.php?j_id=4124&q_id=8&u_id=159931&file='+$rootScope.videoAns.fullPath,
// data: "j_id=" + encodeURIComponent(4124) + "&q_id=" + encodeURIComponent(8) + "&u_id=" + encodeURIComponent(159931) +"&file=" + encodeURIComponent($rootScope.videoAns),
data: form,
cache: false,
timeout: 300000
}).success(function (data, status, headers, config) {
if (status == '200') {
if (data.success == "true") {
alert('uploading...');
}
}
}).error(function (data, status, headers, config) {
});
}
推荐： POST 直接二进制文件
使用 multi-part/form-data 发布二进制文件效率低下，因为 base64 encoding 会额外增加 33% 的开销。如果服务器 API 接受带有二进制数据的 POSTs，post 文件直接：
function upload(url, file) {
if (file.constructor.name != "File") {
throw new Error("Not a file");
}
var config = {
headers: {'Content-Type': undefined},
transformRequest: []
};
return $http.post(url, file, config)
.then(function (response) {
console.log("success!");
return response;
}).catch(function (errorResponse) {
console.error("error!");
throw errorResponse;
});
}
通常是 $http service encodes JavaScript objects as JSON strings。使用 transformRequest: [] 覆盖默认转换。
DEMO of Direct POST
angular.module("app",[])
.directive("selectNgFiles", function() {
return {
require: "ngModel",
link: postLink
};
function postLink(scope, elem, attrs, ngModel) {
elem.on("change", function(event) {
ngModel.$setViewValue(elem[0].files);
});
}
})
.controller("ctrl", function($scope, $http) {
var url = "//httpbin.org/post";
var config = {
headers: { 'Content-type': undefined }
};
$scope.upload = function(files) {
var promise = $http.post(url,files[0],config);
promise.then(function(response){
$scope.result="Success "+response.status;
}).catch(function(errorResponse) {
$scope.result="Error "+errorRespone.status;
});
};
})
<script src="//unpkg.com/angular/angular.js"></script>
<body ng-app="app" ng-controller="ctrl">
<input type="file" select-ng-files ng-model="files">
<br>
<button ng-disabled="!files" ng-click="upload(files)">
Upload file
</button>
<pre>
Name={{files[0].name}}
Type={{files[0].type}}
RESULT={{result}}
</pre>
</body>
发帖 'Content-Type': 'multipart/form-data'
当 post 使用 FormData API 读取数据时，将内容类型设置为 undefined:
很重要
function uploadQuestion(file) {
var form = new FormData();
form.append("j_id", "4124");
form.append("q_id", "6");
form.append("u_id", "159931");
form.append("file", file); //this returns media object which contain all details of recorded video
return $http({
method: 'POST',
headers: { 'Content-Type': undefined ̶'̶m̶u̶l̶t̶i̶p̶a̶r̶t̶/̶f̶o̶r̶m̶-̶d̶a̶t̶a̶'̶ }, // also tried with application/x-www-form-urlencoded
url: 'http://services.example.com/upload.php',
data: form,
̶c̶a̶c̶h̶e̶:̶ ̶f̶a̶l̶s̶e̶,̶
timeout: 300000
̶}̶)̶.̶s̶u̶c̶c̶e̶s̶s̶(̶f̶u̶n̶c̶t̶i̶o̶n̶ ̶(̶d̶a̶t̶a̶,̶ ̶s̶t̶a̶t̶u̶s̶,̶ ̶h̶e̶a̶d̶e̶r̶s̶,̶ ̶c̶o̶n̶f̶i̶g̶)̶ ̶{̶
}).then(function(response) {
var data = response.data;
var status = response.status;
if (status == '200') {
console.log("Success");
}
̶}̶)̶.̶e̶r̶r̶o̶r̶(̶f̶u̶n̶c̶t̶i̶o̶n̶ ̶(̶d̶a̶t̶a̶,̶ ̶s̶t̶a̶t̶u̶s̶,̶ ̶h̶e̶a̶d̶e̶r̶s̶,̶ ̶c̶o̶n̶f̶i̶g̶)̶ ̶{̶
}).catch(function(response) {
console.log("ERROR");
//IMPORTANT
throw response;
});
}
当 XHR API send method sends a FormData Object, it automatically sets the content type header with the appropriate boundary. When the $http service 覆盖内容类型时，服务器将获得没有正确边界的内容类型 header。
无法通过 angular post 调用
发送文件我正在尝试 post .mp4 通过 ionic 1 和 angular 1 将一些数据归档。当 post 通过 POSTMAN 时，它是很好，工作正常。我的申请中 Success = false。
在 POSTMAN 中，没有 headers，数据如下， 服务 url 与 POST 请求 http://services.example.com/upload.php body 表单数据
j_id = 4124, type = text
q_id = 6, type = text
u_id = 159931, type = text
file = demo.mp4, type = file
在我的应用程序中：
$rootScope.uploadQuestion = function () {
var form = new FormData();
form.append("j_id", "4124");
form.append("q_id", "6");
form.append("u_id", "159931");
form.append("file", $rootScope.videoAns.name); //this returns media object which contain all details of recorded video
return $http({
method: 'POST',
headers: { 'Content-Type': 'multipart/form-data' }, // also tried with application/x-www-form-urlencoded
url: 'http://services.example.com/upload.php',
// url: 'http://services.example.com/upload.php?j_id=4124&q_id=8&u_id=159931&file='+$rootScope.videoAns.fullPath,
// data: "j_id=" + encodeURIComponent(4124) + "&q_id=" + encodeURIComponent(8) + "&u_id=" + encodeURIComponent(159931) +"&file=" + encodeURIComponent($rootScope.videoAns),
data: form,
cache: false,
timeout: 300000
}).success(function (data, status, headers, config) {
if (status == '200') {
if (data.success == "true") {
alert('uploading...');
}
}
}).error(function (data, status, headers, config) {
});
}
推荐： POST 直接二进制文件
使用 multi-part/form-data 发布二进制文件效率低下，因为 base64 encoding 会额外增加 33% 的开销。如果服务器 API 接受带有二进制数据的 POSTs，post 文件直接：
function upload(url, file) {
if (file.constructor.name != "File") {
throw new Error("Not a file");
}
var config = {
headers: {'Content-Type': undefined},
transformRequest: []
};
return $http.post(url, file, config)
.then(function (response) {
console.log("success!");
return response;
}).catch(function (errorResponse) {
console.error("error!");
throw errorResponse;
});
}
通常是 $http service encodes JavaScript objects as JSON strings。使用 transformRequest: [] 覆盖默认转换。
DEMO of Direct POST
angular.module("app",[])
.directive("selectNgFiles", function() {
return {
require: "ngModel",
link: postLink
};
function postLink(scope, elem, attrs, ngModel) {
elem.on("change", function(event) {
ngModel.$setViewValue(elem[0].files);
});
}
})
.controller("ctrl", function($scope, $http) {
var url = "//httpbin.org/post";
var config = {
headers: { 'Content-type': undefined }
};
$scope.upload = function(files) {
var promise = $http.post(url,files[0],config);
promise.then(function(response){
$scope.result="Success "+response.status;
}).catch(function(errorResponse) {
$scope.result="Error "+errorRespone.status;
});
};
})
<script src="//unpkg.com/angular/angular.js"></script>
<body ng-app="app" ng-controller="ctrl">
<input type="file" select-ng-files ng-model="files">
<br>
<button ng-disabled="!files" ng-click="upload(files)">
Upload file
</button>
<pre>
Name={{files[0].name}}
Type={{files[0].type}}
RESULT={{result}}
</pre>
</body>
发帖 'Content-Type': 'multipart/form-data'
当 post 使用 FormData API 读取数据时，将内容类型设置为 undefined:
function uploadQuestion(file) {
var form = new FormData();
form.append("j_id", "4124");
form.append("q_id", "6");
form.append("u_id", "159931");
form.append("file", file); //this returns media object which contain all details of recorded video
return $http({
method: 'POST',
headers: { 'Content-Type': undefined ̶'̶m̶u̶l̶t̶i̶p̶a̶r̶t̶/̶f̶o̶r̶m̶-̶d̶a̶t̶a̶'̶ }, // also tried with application/x-www-form-urlencoded
url: 'http://services.example.com/upload.php',
data: form,
̶c̶a̶c̶h̶e̶:̶ ̶f̶a̶l̶s̶e̶,̶
timeout: 300000
̶}̶)̶.̶s̶u̶c̶c̶e̶s̶s̶(̶f̶u̶n̶c̶t̶i̶o̶n̶ ̶(̶d̶a̶t̶a̶,̶ ̶s̶t̶a̶t̶u̶s̶,̶ ̶h̶e̶a̶d̶e̶r̶s̶,̶ ̶c̶o̶n̶f̶i̶g̶)̶ ̶{̶
}).then(function(response) {
var data = response.data;
var status = response.status;
if (status == '200') {
console.log("Success");
}
̶}̶)̶.̶e̶r̶r̶o̶r̶(̶f̶u̶n̶c̶t̶i̶o̶n̶ ̶(̶d̶a̶t̶a̶,̶ ̶s̶t̶a̶t̶u̶s̶,̶ ̶h̶e̶a̶d̶e̶r̶s̶,̶ ̶c̶o̶n̶f̶i̶g̶)̶ ̶{̶
}).catch(function(response) {
console.log("ERROR");
//IMPORTANT
throw response;
});
}
当 XHR API send method sends a FormData Object, it automatically sets the content type header with the appropriate boundary. When the $http service 覆盖内容类型时，服务器将获得没有正确边界的内容类型 header。