package com.whyc.util;
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import java.io.*;
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import java.net.HttpURLConnection;
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import java.net.URL;
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/**
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* zzx
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*/
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public class UrlDownload {
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/**
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* 从网络Url中下载文件
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*
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* @param urlStr
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* @param fileName
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* @param savePath
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* @throws IOException
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*/
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public static void downLoadFromUrl(String urlStr, String fileName, String savePath) throws IOException {
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URL url = new URL(urlStr);
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HttpURLConnection conn = (HttpURLConnection) url.openConnection();
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//设置超时间为3秒
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conn.setConnectTimeout(3 * 1000);
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//防止屏蔽程序抓取而返回403错误
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conn.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)");
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conn.setRequestProperty("lfwywxqyh_token", "v32Eo2Tw+qWI/eiKW3D8ye7l19mf1NngRLushO6CumLMHIO1aryun0/Y3N3YQCv/TqzaO/TFHw4=");
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//得到输入流
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InputStream inputStream = conn.getInputStream();
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//获取自己数组
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byte[] getData = readInputStream(inputStream);
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//文件保存位置
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File saveDir = new File(savePath);
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if (!saveDir.exists()) {
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saveDir.mkdir();
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}
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File file = new File(saveDir + File.separator + fileName);
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FileOutputStream fos = new FileOutputStream(file);
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fos.write(getData);
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if (fos != null) {
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fos.close();
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}
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if (inputStream != null) {
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inputStream.close();
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}
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}
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/**
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* 从输入流中获取字节数组
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*
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* @param inputStream
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* @return
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* @throws IOException
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*/
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public static byte[] readInputStream(InputStream inputStream) throws IOException {
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byte[] buffer = new byte[1024];
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int len = 0;
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ByteArrayOutputStream bos = new ByteArrayOutputStream();
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while ((len = inputStream.read(buffer)) != -1) {
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bos.write(buffer, 0, len);
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}
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bos.close();
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return bos.toByteArray();
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}
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}
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