打印完整的okhttp网络请求和响应消息

背景

开发中，有时需要核对接口请求和响应参数，需要看到详细的接口调用。本来可以通过Facebook Stetho来监控接口的，但是受限于网络，导致调测界面打不开，所以只要寻求其他方案。

解决方案

通过okhttp添加拦截器，打印接口调用日志。

1. 添加依赖 implementation 'com.squareup.okhttp3:logging-interceptor:3.11.0'
2. 添加拦截器 HttpLogInterceptor.java

class HttpLogInterceptor : Interceptor {
    private val TAG = HttpLogInterceptor::class.java.simpleName
    private val UTF8 = Charset.forName("UTF-8")

    @Throws(IOException::class)
    override fun intercept(chain: Interceptor.Chain): Response {
        val request = chain.request()
        val requestBody = request.body()
        var body: String? = null
        requestBody?.let {
            val buffer = Buffer()
            requestBody.writeTo(buffer)
            var charset: Charset? = UTF8
            val contentType = requestBody.contentType()
            contentType?.let {
                charset = contentType.charset(UTF8)
            }
            body = buffer.readString(charset!!)
        }

        Log.d(TAG,
                "发送请求: method：" + request.method()
                        + "\nurl：" + request.url()
                        + "\n请求头：" + request.headers()
                        + "\n请求参数: " + body)

        val startNs = System.nanoTime()
        val response = chain.proceed(request)
        val tookMs = TimeUnit.NANOSECONDS.toMillis(System.nanoTime() - startNs)

        val responseBody = response.body()
        val rBody: String

        val source = responseBody!!.source()
        source.request(java.lang.Long.MAX_VALUE)
        val buffer = source.buffer()

        var charset: Charset? = UTF8
        val contentType = responseBody.contentType()
        contentType?.let {
            try {
                charset = contentType.charset(UTF8)
            } catch (e: UnsupportedCharsetException) {
                Log.e(TAG,e.message)
            }
        }
        rBody = buffer.clone().readString(charset!!)

        Log.d(TAG,
                "收到响应: code:" + response.code()
                        + "\n请求url：" + response.request().url()
                        + "\n请求body：" + body
                        + "\nResponse: " + rBody)

        return response
    }
}

添加拦截器(该拦截器需要最后添加，否则其他对request、response做修改的Interceptor所导致的变更就无法打印出来的。)：

okBuilder.addInterceptor(HttpLogInterceptor())

3. 打印出的日志样例：

4. 如果想要格式化输出的消息格式，可以参考《利用logger打印完整的okhttp网络请求和响应日志》

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