字节流和字符流完成URL下载，并存入本地

字节流

 1 package download;
 2 
 3 import java.io.BufferedInputStream;
 4 import java.io.BufferedOutputStream;
 5 import java.io.File;
 6 import java.io.FileOutputStream;
 7 import java.io.IOException;
 8 import java.net.HttpURLConnection;
 9 import java.net.URL;
10 
11 public class ByteDownload extends Thread {
12     private String down_load;
13     private String path;
14     
15     public ByteDownload(String down_load, String path) {
16         super();
17         this.down_load = down_load;
18         this.path = path;
19     }
20 
21     @Override
22     public void run() {
23         BufferedInputStream bis=null;
24         BufferedOutputStream bos=null;
25         try {
26             URL url=new URL(down_load);
27             HttpURLConnection conn = (HttpURLConnection) url.openConnection();
28             conn.connect();
29             bis=new BufferedInputStream(conn.getInputStream());
30             bos=new BufferedOutputStream(new FileOutputStream(new File(path)));
31             byte[] data=new byte[1024];
32             int len;
33             if(conn.getResponseCode()==200){
34                 while((len=bis.read(data))!=-1){
35                     bos.write(data, 0, len);
36                     bos.flush();
37                 }
38             }
39             System.out.println("下载成功");
40         } catch (Exception e) {
41             e.printStackTrace();
42         }finally{
43             try {
44                 bis.close();
45                 bos.close();
46             } catch (IOException e) {
47                 e.printStackTrace();
48             }
49         }
50         
51     }
52 }

字符流

 1 package download;
 2 
 3 import java.io.BufferedReader;
 4 import java.io.BufferedWriter;
 5 import java.io.File;
 6 import java.io.FileOutputStream;
 7 import java.io.IOException;
 8 import java.io.InputStreamReader;
 9 import java.io.OutputStreamWriter;
10 import java.net.HttpURLConnection;
11 import java.net.URL;
12 
13 public class CharDownload extends Thread {
14     private  String down_url;
15     private String path;
16     
17     public CharDownload(String down_url, String path) {
18         super();
19         this.down_url = down_url;
20         this.path = path;
21     }
22     @Override
23     public void run() {
24         BufferedReader br=null;
25         BufferedWriter bw=null;
26         try {
27             URL url=new URL(down_url);
28             HttpURLConnection conn = (HttpURLConnection) url.openConnection();
29             conn.connect();
30             br=new BufferedReader(new InputStreamReader(conn.getInputStream()));
31             bw=new BufferedWriter(new OutputStreamWriter(new FileOutputStream(new File(path))));
32             String str = null;
33             if(conn.getResponseCode()==200){
34                 str=br.readLine();
35                 System.out.println(str);
36                 bw.write(str);
37             }
38             ByteDownload bd=new ByteDownload(str, "d:/folder01/99.jpg");
39             bd.start();
40         } catch (Exception e) {
41             e.printStackTrace();
42         }finally{
43             try {
44                 br.close();
45                 bw.close();
46             } catch (IOException e) {
47                 e.printStackTrace();
48             }
49             
50         }
51     }
52 
53 }