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Android Kotlin 连接 http

 

  由于近期网上搜索了很多Android连接到http的方法, 可是2013年以前的方法现在都不能用了,要么报错,要么被遗弃,岁月留下来的东西只能自己整理了。

 

  其实很简单,就一个HttpUtil通用类。可以实现Get和Post方法,其他东西,里面可以随便改改,基本就这样吧。

 

  参数的话,我用了一个 strUrlPath网址、params键值对、encode编码(如utf-8)。

 

 

  

package Util

import android.os.Handler
import android.os.Message
import android.view.View
import android.widget.Button
import java.io.BufferedReader
import java.io.ByteArrayOutputStream
import java.io.IOException
import java.io.InputStream
import java.io.InputStreamReader
import java.io.OutputStream
import java.net.HttpURLConnection
import java.net.MalformedURLException
import java.net.URL
import java.net.URLEncoder

/**
 * Created by Jason_Jan on 2017/7/5.
 */

object HttpUtil {


    private var handler: Handler? = null
    private var my_result: String? = null

    fun httpGet(strUrlPath: String, params: Map<String, String>, encode: String): String {
        var strUrlPath = strUrlPath
        /* byte[] data = http://www.mamicode.com/getRequestData(params, encode).toString().getBytes();//获得请求体*/"http://emb.mobi/register";*/
        var result: String? = null
        val append_url = getRequestData(params, encode).toString()
        strUrlPath = strUrlPath + "?" + append_url
        try {
            val url = URL(strUrlPath)
            val urlConn = url.openConnection() as HttpURLConnection
            urlConn.connectTimeout = 5000//超时时间
            urlConn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded")//设置头部信息,其实没什么用

            //主角开始登场,不注意就是几个小时的调试,输入流
            val `in` = InputStreamReader(urlConn.inputStream)

            val buffer = BufferedReader(`in`)
            var inputLine: String? = null
            //循环逐行读取输入流中的内容

            result = ""//每次清空数据

            while (buffer.readLine().apply { inputLine = this } != null) {
                result += inputLine!! + "\n"
            }


            `in`.close()
            urlConn.disconnect()


        } catch (e: MalformedURLException) {
            e.printStackTrace()
        } catch (ioe: IOException) {
            ioe.printStackTrace()
            return "err:" + ioe.message.toString()
        }

        return result!!

    }


    private fun getRequestData(params: Map<String, String>, encode: String): StringBuffer {
        val stringBuffer = StringBuffer()        //存储封装好的请求体信息
        try {
            for ((key, value) in params) {
                stringBuffer.append(key)
                        .append("=")
                        .append(URLEncoder.encode(value, encode))
                        .append("&")
            }
            stringBuffer.deleteCharAt(stringBuffer.length - 1)    //删除最后的一个"&"
        } catch (e: Exception) {
            e.printStackTrace()
        }

        return stringBuffer
    }


    fun httpPost(strUrlPath: String, params: Map<String, String>, encode: String): String {
        val data = http://www.mamicode.com/getRequestData(params, encode).toString().toByteArray()"POST"
            http.useCaches = false//使用post方式不能用缓存
            //设置请求体的类型是文本类型
            http.setRequestProperty("Content-Type", "application/x-www-form-urlencoded")
            //设置请求体的长度
            http.setRequestProperty("Content-Length", data.size.toString())
            //获得输出流,向服务器写入数据
            val out = http.outputStream
            out.write(data)

            val response = http.responseCode
            if (response == HttpURLConnection.HTTP_OK) {
                val inputStream = http.inputStream
                return dealResponseResult(inputStream)
            }


        } catch (ioe: IOException) {
            ioe.printStackTrace()
            return "err:" + ioe.message.toString()
        }

        return "-1"
    }


    fun dealResponseResult(inputStream: InputStream): String {
        var resultData: String? = null      //存储处理结果
        val byteArrayOutputStream = ByteArrayOutputStream()
        val data = http://www.mamicode.com/ByteArray(1024)>

  

  

  使用方式很简单--HttpUtil.方法名(参数),返回一个string,之后用Json解析工具来解析。

 

  其次重中之重,安卓网络连接有点坑。下面从两个方面谈谈。

  1.getoutputstream这里,一直报错。解决方案:build.gradle

compile ‘com.squareup.retrofit:retrofit:1.8.0‘
compile ‘com.squareup.okhttp:okhttp:2.1.0‘
compile ‘com.squareup.okhttp:okhttp-urlconnection:2.1.0‘

  2.其次,在AndroidManifest.xml中

<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.INTERNET" />  

  

  

 

  

Android Kotlin 连接 http