java編寫Http服務(wù)器下載工具

更新時(shí)間：2015年03月25日 15:39:28 投稿：hebedich

這篇文章主要介紹了java編寫Http服務(wù)器下載工具的方法，工具很簡(jiǎn)單，功能也很簡(jiǎn)單，代碼就更簡(jiǎn)潔了，卻非常實(shí)用，有需要的小伙伴參考下吧。

這個(gè)工具比較簡(jiǎn)單，用于配合另外一個(gè)工具進(jìn)行文件傳送,廢話少說(shuō)，上代碼

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(gè)工具實(shí)現(xiàn)了從HTTP服務(wù)器上下載指定行數(shù)的文件，并且不會(huì)因?yàn)榫幋a的問題引起下載的文件內(nèi)容亂碼
三個(gè)工具已經(jīng)搞定，下一次就是把這三個(gè)工具結(jié)合起來(lái)將HTTP、FTP的文件轉(zhuǎn)移到HDFS上

hadoop工具
ftp工具

以上就是本文所述的全部?jī)?nèi)容了，希望大家能喜歡。

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