package com.lxzn.framework.utils;
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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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* @author clown
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* * @date 2022/10/18
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*/
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public class HttpRequest {
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/**
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* 从网络Url中下载文件
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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 boolean downLoadFromUrl(String urlStr,String fileName,String savePath) throws IOException {
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//urlStr = "http://localhost:9099/outer/test/download.xhtml";
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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",toekn);*/
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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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System.out.println("info:"+url+" download success");
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return true;
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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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* @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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