使用java下载一首歌(HttpClient/JavaIO)

来源：互联网发布：软件开发项目经费预算编辑：程序博客网时间：2024/06/09 17:26

需要HttpClient的支持，而且需要手动在主函数调用一次。

音乐或文件链接以及本地URL因时因地而异。

初学，望各位大神指点！

package httptest;import java.io.*;import java.util.ArrayList;import java.util.List;import org.apache.http.HttpEntity;import org.apache.http.HttpResponse;import org.apache.http.ParseException;import org.apache.http.client.ClientProtocolException;import org.apache.http.client.entity.UrlEncodedFormEntity;import org.apache.http.client.methods.CloseableHttpResponse;import org.apache.http.client.methods.HttpGet;import org.apache.http.client.methods.HttpPost;import org.apache.http.impl.client.CloseableHttpClient;import org.apache.http.impl.client.HttpClients;import org.apache.http.message.BasicNameValuePair;import org.apache.http.util.EntityUtils;public class HttpClientTest{   public void download()    {        try        {            CloseableHttpClient closeableHttpClient = HttpClients.createDefault();            HttpGet httpGet = new HttpGet("http://mvvideo1.meitudata.com/57199f5ceb9288320.mp4");            HttpResponse httpResponse = closeableHttpClient.execute(httpGet);            System.out.println(httpResponse.getStatusLine());            System.out.println("获取服务器响应成功！");            for (org.apache.http.Header header : httpResponse.getAllHeaders())            {                System.out.println(header.getName() +":"+ header.getValue());            }            HttpEntity entity = httpResponse.getEntity();            InputStream inputStream = entity.getContent();            long len = entity.getContentLength();            File file = new File("C:\\Users\\LiuZijian\\Desktop\\21.mp4");            OutputStream outputStream = new FileOutputStream(file);            int current = 0;            byte data[] = new byte[10];            int length = 0;            while ((length = inputStream.read(data)) != -1)            {                outputStream.write(data,0,length);                current += length;                System.out.println("下载进度 :" + (float) current/(float)len);            }            inputStream.close();            outputStream.close();            System.out.println("下载成功！");        }        catch (IOException e)        {            e.printStackTrace();        }        catch (Exception e)        {            e.printStackTrace();        }    }}

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