Kotlin HttpURLConnection与服务器交互实现方法详解

目录

• 1.查询(get)-调用的时候记得开线程
• 2.改(post)
• 3.增(PUT)
• 4.删(DELETE请求)

1.查询(get)-调用的时候记得开线程

GET一般用于获取/查询资源信息

 val sb = StringBuffer()
 try {
     val url = URL(url)
     val conn = url.openConnection() as HttpURLConnection
     conn.requestMethod = "GET"
     conn.connectTimeout = 5000
     val code = conn.responseCode
     if (code == 200) {
         val `is` = conn.inputStream
         val b = ByteArray(1024)
         var len: Int
         while (`is`.read(b).also { len = it } != -1) {
               sb.append(String(b, 0, len, Charset.forName("UTF-8")))
         }
          `is`.close()
         conn.disconnect()
         Log.e("TAG","sb==${sb.toString()}")
     } else {
       Log.e("TAG","code==${code.toString()}")
     }
   } catch (var1: Exception) {
     Log.e("TAG","Exception==${var1.message}")
   }

2.改(post)

post向指定资源提交数据进行处理请求（提交表单、上传文件），又可能导致新的资源的建立或原有资源的修改。

  val sb = StringBuffer()
        object : Thread() {
            override fun run() {
                super.run()
                try {
                    val url = URL(urlPath)
                    val conn = url.openConnection() as HttpURLConnection
                    conn.doOutput = true
                    conn.requestMethod = "POST"
                    conn.connectTimeout = 5000
                    conn.doInput = true
                    conn.useCaches = false
                    conn.setRequestProperty("Connection", "Keep-Alive")
                    conn.setRequestProperty("Charset", "UTF-8")
                    conn.setRequestProperty("Content-Type", "application/json; charset=UTF-8")
                    conn.setRequestProperty("accept", "application/json")
                    conn.setRequestProperty("appid", mAPP_ID)
                    conn.setRequestProperty("ts", time)
                    conn.setRequestProperty("sign", sign)
                    Log.e(TAG, "Json:$Json")
                    if (Json != null && !TextUtils.isEmpty(Json)) {
                        val writebytes = Json.toByteArray()
                        conn.setRequestProperty("Content-Length", writebytes.size.toString())
                        val outwritestream = conn.outputStream
                        outwritestream.write(Json.toByteArray())
                        outwritestream.flush()
                        outwritestream.close()
                    }
                    val code = conn.responseCode
                    if (code == 200) {
                        val `is` = conn.inputStream
                        val b = ByteArray(1024)
                        var len: Int
                        while (`is`.read(b).also { len = it } != -1) {
                            sb.append(String(b, 0, len, Charset.forName("UTF-8")))
                        }
                        `is`.close()
                        conn.disconnect()
                        Log.w(TAG, "TXPost sb====$sb")
                    } else {
                        Log.w(TAG, "TXPost code====$code")
                    }
                } catch (var1: Exception) {
                    Log.w(TAG, "TXPost Exception====$var1")
                }
            }
        }.start()

设置请求头:

1.基本headers 这四句一般没有特殊需求的话,都是需要的
conn.setRequestProperty("Connection", "Keep-Alive")
conn.setRequestProperty("Charset", "UTF-8")
conn.setRequestProperty("Content-Type", "application/json; charset=UTF-8")
conn.setRequestProperty("accept", "application/json")
2.特殊headers 这些是客户端与服务通信服务器所需的headers
conn.setRequestProperty("appid", mAPP_ID)
conn.setRequestProperty("ts", time)
conn.setRequestProperty("sign", sign) 

Headers:

HTTP是“Hypertext Transfer Protocol”的所写，整个万维网都在使用这种协议，几乎你在浏览器里看到的大部分内容都是通过http协议来传输的.

HTTP Headers是HTTP请求和相应的核心，它承载了关于客户端浏览器，请求页面，服务器等相关的信息.

设置body(请求内容)

if (Json != null && !TextUtils.isEmpty(Json)) {
   val writebytes = Json.toByteArray()
   conn.setRequestProperty("Content-Length", writebytes.size.toString())
   val outwritestream = conn.outputStream
   outwritestream.write(Json.toByteArray())
   outwritestream.flush()
   outwritestream.close()
  }

有时候开发的时候你能看到一个名叫token的东西,这个玩意是后台自定义的东西,有时候可以放在请求头,有时候可以放在body里面,具体可以看协议

3.增(PUT)

PUT：这个方法比较少见。HTML表单也不支持这个。本质上来讲， PUT和POST极为相似，都是向服务器发送数据，但它们之间有一个重要区别，PUT通常指定了资源的存放位置，而POST则没有，POST的数据存放位置由服务器自己决定。

val url = URL(urlPath)
        val connection = url.openConnection() as HttpURLConnection
        val outputStream = connection.outputStream
        val inputStream = FileInputStream(file)
        object : Thread() {
            override fun run() {
                super.run()
                try {
                    connection.doOutput = true
                    connection.useCaches = false
                    connection.setRequestProperty("Accept-Charset", "utf-8")
                    connection.setRequestProperty("Connection", "keep-alive")
                    connection.setRequestProperty(
                        "Content-Type",
                        "multipart/form-data;boundary=fengexian===="
                    )
                    connection.setRequestProperty("Accept", "application/json")
                    connection.connect()
                    val bytes = ByteArray(
                        getFileOrFilesSize(file.absolutePath).toInt()
                    )
                    var length: Int
                    while (inputStream.read(bytes).also { length = it } != -1) {
                        outputStream.write(bytes, 0, length)
                    }
                    outputStream.flush()
                    val response = connection.inputStream
                    val reader = InputStreamReader(response)
                    while (reader.read() != -1) {
                        String(bytes, Charset.forName("UTF-8"))
                    }
                    if (connection.responseCode == 200) {
                        Log.w("TAG", "connection===${connection.responseMessage}")
                    } else {
                        Log.w("TAG", "responseCode===${connection.responseCode}")
                    }
                } catch (var13: IOException) {
                    Log.w("TAG", "IOException===${var13.message}")
                } finally {
                    try {
                        outputStream.close()
                        inputStream.close()
                        connection.disconnect()
                    } catch (var12: IOException) {
                        var12.printStackTrace()
                    }
                }
            }
        }.start()

4.删(DELETE请求)

DELETE：删除某一个资源。基本上这个也很少见,我只在像亚马逊s3之类的服务器见过!

val sb = StringBuffer()
        var uri: URL? = null
        var con: HttpURLConnection? = null
        try {
            uri = URL(url)
            con = uri.openConnection() as HttpURLConnection
            con.requestMethod = "DELETE"
            con.doOutput = true
            con.doInput = true
            con.connectTimeout = 60000 //60 secs
            con.readTimeout = 60000 //60 secs
            val code = con.responseCode
            if (code == 200) {
                val `is` = con.inputStream
                val b = ByteArray(1024)
                var len: Int
                while (`is`.read(b).also { len = it } != -1) {
                    sb.append(String(b, 0, len, Charset.forName("UTF-8")))
                }
                `is`.close()
                con.disconnect()
                Log.w("TAG", "sb===${sb}")
            } else {
                Log.w("TAG", "code===$[code]")
            }
        } catch (e: Exception) {
            Log.w("TAG", "Exception===${e.message}")
        }

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