java httpclient请求的图片读取字节流代码实现

痛定思痛。 2022-05-17 06:23 198阅读 0赞

代码：

package image;
    
    import downloader.SimpleDownloader;
    import org.apache.http.HttpEntity;
    import org.apache.http.client.methods.CloseableHttpResponse;
    import org.junit.jupiter.api.Test;
    
    import java.io.*;
    
    public class RequestImage{
    
    @Test
    public void requestImageTest() throws Exception {
    SimpleDownloader downloader = new SimpleDownloader();
    String url ="http://cdn.aiclicash.com/uploads/a119b4374decf3172be08784d8de26b6_1501897_225_150.jpg";
    CloseableHttpResponse response = downloader.get(url,null);
    HttpEntity httpEntity = response.getEntity();
    InputStream inputStream = httpEntity.getContent();
    byte[]data = readInputStream(inputStream);
    readWriteGra(data);
    new UseGra(inputStream,data);
    }
    
    private byte[] readInputStream(InputStream inputStream) throws IOException {
    ByteArrayOutputStream outStream = new ByteArrayOutputStream();
    //创建一个Buffer字符串
    byte[] buffer = new byte[1024];
    //每次读取的字符串长度，如果为-1，代表全部读取完毕
    int len = 0;
    //使用一个输入流从buffer里把数据读取出来
    while ((len = inputStream.read(buffer)) != -1) {
    //用输出流往buffer里写入数据，中间参数代表从哪个位置开始读，len代表读取的长度
    outStream.write(buffer, 0, len);
    }
    //把outStream里的数据写入内存
    return outStream.toByteArray();
    }
    
    private void readWriteGra(byte[] data) throws IOException {
    File desc = new File("D:/desc.jpg");
    FileOutputStream out = new FileOutputStream(desc);
    out.write(data);
    out.close();
    }
    
    }