Java-单线程实现图片的下载

package src;

import java.io.File;

import java.io.IOException;

import java.io.InputStream;

import java.io.RandomAccessFile;

import java.net.HttpURLConnection;

import java.net.MalformedURLException;

import java.net.URL;

import java.io.*;

/*

 * 2016年6月7日19:15:30

 * author：toreadwh

 * */

public class OneThread {
//单线程下载图片实例
private static String path ="http://192.168.199.1:8080/zuimei/2.jpg";
public static void main(String[] args){
try {
URL url = new URL(path);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
conn.setConnectTimeout(5000);
if(conn.getResponseCode() == 200){
InputStream in = conn.getInputStream();
byte[] buf = readInputstream(in);
File file = new File("2.jpg");
FileOutputStream fos = new FileOutputStream(file);
fos.write(buf);
in.close();
fos.close();

System.out.println("图片已下载成功！");
}

} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
private static byte[] readInputstream(InputStream in) throws IOException {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
int len = 0;
byte[] buf = new byte[1024];
while((len = in.read(buf))>0){
baos.write(buf,0,len);
}

return baos.toByteArray();
}

}

/*单线程下载图片

 * 总结：

 * 1.如果要下载图片，我们首先要获取图片的地址(这里Tomcat)

 * 2.HttpURLConnection 取得与服务器的连接

 * 3.使用conn得到一个输入流

 * 4.创建一个文件和一个文件输出流

 * 5.readInputstream()方法：对流内容的读取，返回一个字节数组

 * */