這個工具比較簡單，用于配合另外一個工具進行文件傳送,廢話少說，上代碼
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import java.net.URL;import java.net.URLConnection;import java.io.File;import java.io.InputStream;import java.io.FileOutputStream;import java.io.FileNotFoundException;import java.io.IOException;import org.apache.commons.io.FileUtils;public class HttpUtil{ private String httppath = ""; public void setHttpPath(String httppath){ this.httppath = httppath; } public String getHttpPath(){ return this.httppath; } public HttpUtil(String httppath){ this.httppath = httppath; } public InputStream getStream(String url){ InputStream inStream = null; try{ URL httpurl = new URL(url); URLConnection conn = httpurl.openConnection(); inStream = conn.getInputStream(); }catch (Exception e){ e.printStackTrace(); return null; } return inStream; } public int downLoad(String url,String localName ,int lines) throws FileNotFoundException, IOException{ FileOutputStream fos = null; InputStream inStream = null; int ret = 0; try{ URL httpurl = new URL(url); URLConnection conn = httpurl.openConnection(); inStream = conn.getInputStream(); fos = new FileOutputStream(localName); byte[] b = new byte[102400]; int j = 0; while(inStream.read(b) != -1 && lines > 0){ for(int i = j; i < b.length; i++){ if(b[i] == '\n'){ fos.write(b, j, i - j + 1); lines--; if(lines <= 0){ break; } j = i + 1; continue; } } } }catch (Exception e){ e.printStackTrace(); ret = -1; }finally { fos.close(); inStream.close(); return ret; } } public static void main(String[] args){ String httppath = ""; int lines = 0; String localName = ""; try{ httppath = args[0]; localName = args[1]; lines = Integer.parseInt(args[2]); }catch (Exception e){ e.printStackTrace(); return; } try{ HttpUtil hu = new HttpUtil(httppath); hu.downLoad(hu.getHttpPath(),localName ,lines); }catch (Exception e){ e.printStackTrace(); } }} |
這個工具實現了從HTTP服務器上下載指定行數的文件，并且不會因為編碼的問題引起下載的文件內容亂碼
三個工具已經搞定，下一次就是把這三個工具結合起來將HTTP、FTP的文件轉移到HDFS上
以上就是本文所述的全部內容了，希望大家能喜歡。
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