这个工具比较简单，用于配合另外一个工具进行文件传送,废话少说，上代码

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();        }    }}

这个工具实现了从HTTP服务器上下载指定行数的文件，并且不会因为编码的问题引起下载的文件内容乱码