URLSession
原文出自：www.hangge.com 转载请保留原文链接：https://www.hangge.com/blog/cache/detail_2215.html
如何使用原生代码（URLSession）来实现：一次性上传多个文件和多个参数到服务器。
- 客户端代码（ViewController.swift）
swift
import UIKit
import MobileCoreServices
class ViewController: UIViewController {
@IBAction func startUpload(_ sender: Any) {
//分隔线
let boundary = "Boundary-\(UUID().uuidString)"
//传递的参数
let parameters = [
"value1": "hangge.com",
"value2": "1234"
]
//传递的文件
let files = [
(
name: "file1",
path:Bundle.main.path(forResource: "1", ofType: "jpg")!
),
(
name: "file2",
path:Bundle.main.path(forResource: "2", ofType: "png")!
)
]
//上传地址
let url = URL(string: "http://www.hangge.com/upload.php")!
var request = URLRequest(url: url)
//请求类型为POST
request.httpMethod = "POST"
request.setValue("multipart/form-data; boundary=\(boundary)",
forHTTPHeaderField: "Content-Type")
//创建表单body
request.httpBody = try! createBody(with: parameters, files: files, boundary: boundary)
//创建一个表单上传任务
let session = URLSession.shared
let uploadTask = session.dataTask(with: request, completionHandler: {
(data, response, error) -> Void in
//上传完毕后
if error != nil{
print(error!)
}else{
let str = String(data: data!, encoding: String.Encoding.utf8)
print("--- 上传完毕 ---\(str!)")
}
})
//使用resume方法启动任务
uploadTask.resume()
}
//创建表单body
private func createBody(with parameters: [String: String]?,
files: [(name:String, path:String)],
boundary: String) throws -> Data {
var body = Data()
//添加普通参数数据
if parameters != nil {
for (key, value) in parameters! {
// 数据之前要用 --分隔线 来隔开 ，否则后台会解析失败
body.append("--\(boundary)\r\n")
body.append("Content-Disposition: form-data; name=\"\(key)\"\r\n\r\n")
body.append("\(value)\r\n")
}
}
//添加文件数据
for file in files {
let url = URL(fileURLWithPath: file.path)
let filename = url.lastPathComponent
let data = try Data(contentsOf: url)
let mimetype = mimeType(pathExtension: url.pathExtension)
// 数据之前要用 --分隔线 来隔开 ，否则后台会解析失败
body.append("--\(boundary)\r\n")
body.append("Content-Disposition: form-data; "
+ "name=\"\(file.name)\"; filename=\"\(filename)\"\r\n")
body.append("Content-Type: \(mimetype)\r\n\r\n") //文件类型
body.append(data) //文件主体
body.append("\r\n") //使用\r\n来表示这个这个值的结束符
}
// --分隔线-- 为整个表单的结束符
body.append("--\(boundary)--\r\n")
return body
}
//根据后缀获取对应的Mime-Type
func mimeType(pathExtension: String) -> String {
if let uti = UTTypeCreatePreferredIdentifierForTag(kUTTagClassFilenameExtension,
pathExtension as NSString,
nil)?.takeRetainedValue() {
if let mimetype = UTTypeCopyPreferredTagWithClass(uti, kUTTagClassMIMEType)?
.takeRetainedValue() {
return mimetype as String
}
}
//文件资源类型如果不知道，传万能类型application/octet-stream，服务器会自动解析文件类
return "application/octet-stream"
}
}
//扩展Data
extension Data {
//增加直接添加String数据的方法
mutating func append(_ string: String, using encoding: String.Encoding = .utf8) {
if let data = string.data(using: encoding) {
append(data)
}
}
}1
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- 服务端代码（upload.php）
php
<?
$value1 = $_POST["value1"];
$value2 = $_POST["value2"];
move_uploaded_file($_FILES["file1"]["tmp_name"],
$_SERVER["DOCUMENT_ROOT"]."/uploadFiles/" . $_FILES["file1"]["name"]);
move_uploaded_file($_FILES["file2"]["tmp_name"],
$_SERVER["DOCUMENT_ROOT"]."/uploadFiles/" . $_FILES["file2"]["name"]);
echo "\r\n两个参数为：".$value1."，".$value2;
echo "\r\n两个文件为：". $_FILES["file1"]["name"]."，".$_FILES["file2"]["name"];
?>1
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上传时附带上传进度
如果想在上传的过程中实时获取当前进度，就不能使用全局的 URLSession.shared 和 dataTask 方法，而需使用自定义的 URLSession 对象和并实现相关的代理方法。
swift
import UIKit
import MobileCoreServices
class ViewController: UIViewController {
@IBAction func startUpload(_ sender: Any) {
//分隔线
let boundary = "Boundary-\(UUID().uuidString)"
//传递的参数
let parameters = [
"value1": "hangge.com",
"value2": "1234"
]
//传递的文件
let files = [
(
name: "file1",
path:Bundle.main.path(forResource: "1", ofType: "jpg")!
),
(
name: "file2",
path:Bundle.main.path(forResource: "2", ofType: "png")!
)
]
//上传地址
let url = URL(string: "http://www.hangge.com/upload.php")!
var request = URLRequest(url: url)
//请求类型为POST
request.httpMethod = "POST"
request.setValue("multipart/form-data; boundary=\(boundary)",
forHTTPHeaderField: "Content-Type")
//创建表单body
request.httpBody = try! createBody(with: parameters, files: files, boundary: boundary)
//创建一个表单上传任务
let session = URLSession(configuration: .default, delegate: self, delegateQueue: nil)
let uploadTask = session.dataTask(with: request, completionHandler: {
(data, response, error) -> Void in
//上传完毕后
if error != nil{
print(error!)
}else{
let str = String(data: data!, encoding: String.Encoding.utf8)
print("--- 上传完毕 ---\(str!)")
}
})
//使用resume方法启动任务
uploadTask.resume()
}
//创建表单body
private func createBody(with parameters: [String: String]?,
files: [(name:String, path:String)],
boundary: String) throws -> Data {
var body = Data()
//添加普通参数数据
if parameters != nil {
for (key, value) in parameters! {
// 数据之前要用 --分隔线 来隔开 ，否则后台会解析失败
body.append("--\(boundary)\r\n")
body.append("Content-Disposition: form-data; name=\"\(key)\"\r\n\r\n")
body.append("\(value)\r\n")
}
}
//添加文件数据
for file in files {
let url = URL(fileURLWithPath: file.path)
let filename = url.lastPathComponent
let data = try Data(contentsOf: url)
let mimetype = mimeType(pathExtension: url.pathExtension)
// 数据之前要用 --分隔线 来隔开 ，否则后台会解析失败
body.append("--\(boundary)\r\n")
body.append("Content-Disposition: form-data; "
+ "name=\"\(file.name)\"; filename=\"\(filename)\"\r\n")
body.append("Content-Type: \(mimetype)\r\n\r\n") //文件类型
body.append(data) //文件主体
body.append("\r\n") //使用\r\n来表示这个这个值的结束符
}
// --分隔线-- 为整个表单的结束符
body.append("--\(boundary)--\r\n")
return body
}
//根据后缀获取对应的Mime-Type
func mimeType(pathExtension: String) -> String {
if let uti = UTTypeCreatePreferredIdentifierForTag(kUTTagClassFilenameExtension,
pathExtension as NSString,
nil)?.takeRetainedValue() {
if let mimetype = UTTypeCopyPreferredTagWithClass(uti, kUTTagClassMIMEType)?
.takeRetainedValue() {
return mimetype as String
}
}
//文件资源类型如果不知道，传万能类型application/octet-stream，服务器会自动解析文件类
return "application/octet-stream"
}
}
extension ViewController: URLSessionDelegate, URLSessionTaskDelegate {
//上传代理方法，监听上传进度
func urlSession(_ session: URLSession, task: URLSessionTask,
didSendBodyData bytesSent: Int64, totalBytesSent: Int64,
totalBytesExpectedToSend: Int64) {
//获取进度
let written = (Float)(totalBytesSent)
let total = (Float)(totalBytesExpectedToSend)
let pro = written/total
print("当前进度：\(pro)")
}
}
//扩展Data
extension Data {
//增加直接添加String数据的方法
mutating func append(_ string: String, using encoding: String.Encoding = .utf8) {
if let data = string.data(using: encoding) {
append(data)
}
}
}1
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