在Scala编程中，常常会用到调用第三方接口，获取返回值(文件内容是字符类型，或者返回的是字符串)，那么使用Scala自带的Scala.io.Source类，将非常方便。
举例如下：
1、url="http://localhost:9008/services/user/getSampleValue"
2、返回值：有两种
(1)字符串："{"status":"1","timestamp":"201612131742","sampleList":[{"domain":"www.linuxidc.com","proportion":"0.8"},{"domain":"www.linuxidc.net","proportion":"0.4"}]}"
(2)文件流(内容是字符)：sample.txt文件
内容是："{"status":"1","timestamp":"201612131742","sampleList":[{"domain":"www.linuxidc.com","proportion":"0.8"},{"domain":"www.linuxidc.net","proportion":"0.4"}]}"
实现的代码如下：
import Java.io.PrintWriter
import scala.io.Source
/**
* Created by yangjf on 2016/12/14
* Update date:
* Time: 9:35
* Describle :测试使用Scala调用url
* Result of Test:通过
* Command:
*/
object TestScalaUrl {
def main(args: Array[String]) {
//获取抽样参数的url
val url="http://localhost:9008/services/user/getSampleValue"
//链接url，获取返回值
val fileContent = Source.fromURL(url,"utf-8").mkString
//写入本地磁盘
val pw = new PrintWriter("F:/test.ip")
pw.write(fileContent)
pw.flush
pw.close
}
//可以从InputStream中读取
def inputToString(is: java.io.InputStream): String = {
val lines: Iterator[String] = scala.io.Source.fromInputStream(is, "utf-8").getLines()
val sb = new StringBuilder()
lines.foreach(sb.append(_))
sb.toString()
}
//将输入流写入文件(test.txt)中
//参数f---> val file = new File("F:/test.txt")
def inputToFile(is: java.io.InputStream, f: java.io.File) {
val in: BufferedSource = scala.io.Source.fromInputStream(is)
val out = new java.io.PrintWriter(f)
try {
in.getLines().foreach(out.print(_))//等价write，只是多了一句if(s==null)s="null"
}
finally {
out.close
}
}
}
参考Scala 的API：