字节流和字符流完成URL下载，并存入本地

字节流

package download;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.URL;

public class ByteDownload extends Thread {
    private String down_load;
    private String path;
    
    public ByteDownload(String down_load, String path) {
        super();
        this.down_load = down_load;
        this.path = path;
    }

    @Override
    public void run() {
        BufferedInputStream bis=null;
        BufferedOutputStream bos=null;
        try {
            URL url=new URL(down_load);
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.connect();
            bis=new BufferedInputStream(conn.getInputStream());
            bos=new BufferedOutputStream(new FileOutputStream(new File(path)));
            byte[] data=new byte[1024];
            int len;
            if(conn.getResponseCode()==200){
                while((len=bis.read(data))!=-1){
                    bos.write(data, 0, len);
                    bos.flush();
                }
            }
            System.out.println("下载成功");
        } catch (Exception e) {
            e.printStackTrace();
        }finally{
            try {
                bis.close();
                bos.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        
    }
}

字符流

package download;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.URL;

public class CharDownload extends Thread {
    private  String down_url;
    private String path;
    
    public CharDownload(String down_url, String path) {
        super();
        this.down_url = down_url;
        this.path = path;
    }
    @Override
    public void run() {
        BufferedReader br=null;
        BufferedWriter bw=null;
        try {
            URL url=new URL(down_url);
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.connect();
            br=new BufferedReader(new InputStreamReader(conn.getInputStream()));
            bw=new BufferedWriter(new OutputStreamWriter(new FileOutputStream(new File(path))));
            String str = null;
            if(conn.getResponseCode()==200){
                str=br.readLine();
                System.out.println(str);
                bw.write(str);
            }
            ByteDownload bd=new ByteDownload(str, "d:/folder01/99.jpg");
            bd.start();
        } catch (Exception e) {
            e.printStackTrace();
        }finally{
            try {
                br.close();
                bw.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
            
        }
    }

}