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示例代码

import java.io.File;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.net.HttpURLConnection;

import java.net.URL;

import java.text.SimpleDateFormat;

import java.util.Date;

import java.util.Locale;

import java.util.TimeZone;

import javax.crypto.Mac;

import javax.crypto.spec.SecretKeySpec;

import org.apache.commons.codec.binary.Base64;

public class ImageSample {

private static String objectName = "your_object";

private static String ak = "your_ak";

private static String sk = "your_sk";

private static final int CONN_TIMEOUT = 10000;

private static final int READ_TIMEOUT = 30000;

private static final String DATE_STR = "EEE, d MMM yyyyHH:mm:ss 'GMT'";

private static String bucket = "your_bucket";

private static String host = "oos-hz.ctyunapi.cn";

private static final SimpleDateFormat DATE_FMT = newSimpleDateFormat(DATE_STR, Locale.ENGLISH);

static {

TimeZonegmt = TimeZone.getTimeZone("GMT");

DATE_FMT.setTimeZone(gmt);

    }

public static void main(String[] args) throws Exception {

ImageSample is = new ImageSample();

// 获取单边固定宽度的缩略图片，宽度为100，高度按比例处理

is.getObject(bucket, objectName, "@oosImage|100h", new  File("single_side_width.jpg"));

// 获取单边固定宽度的缩略图片，强制缩略成宽度为100，高度为100

is.getObject(bucket, objectName, "@oosImage|100h_100w_2e",                 new File("force_width_height.jpg"));

// 按比例缩放图片，将图按比例缩小1/2

is.getObject(bucket, objectName, "@oosImage|50p", new File("reduce.jpg"));

//格式转换，将jpg保存成高度为100, 宽度为100的png格式

is.getObject(bucket, objectName, "@oosImage|100h_100w.png",                 new File("format_conversion.png"));

// 获取图片的基本信息和exif信息

is.getObject(bucket, objectName, "@oosImage|infoexif", new File("info.txt"));

// 获取文字水印图片，字体是文泉驿正黑，字体大小是20, 颜色是白色(#FFFFFF), 文字阴影是50, 文字水印内容是：Hello, 图片服务！，水印位置是：右中，水平边距是：10，中线垂直偏移是：20

is.getObject(bucket, objectName,                 "@oosImage|watermark=2&type=d3F5LXplbmhlaQ&size=20&text=SGVsbG8g5Zu-54mH5pyN5YqhIQ&color=I0ZGRkZGRg&s=50&t=90&p=6&x=10&voffset=20", new File("wartermark.jpg"));

}

private String authorize(String httpVerb, String date, String bucket, String objectName) throws Exception {

        String stringToSign = httpVerb + "\n\n\n" + date + "\n/" + bucket + "/" + objectName;

        Mac mac = Mac.getInstance("HmacSHA1");

mac.init(newSecretKeySpec(sk.getBytes("UTF-8"), "HmacSHA1"));

byte[] macResult = mac.doFinal(stringToSign.getBytes("UTF-8"));

        String signature = newString(Base64.encodeBase64(macResult), "UTF-8");

        String authorization = "AWS " + ak + ":" + signature;

        return authorization;

    }

public static void downloadInputStream(InputStreaminput, File file) throws IOException {

 int c;

 FileOutputStream fos = newFileOutputStream(file);

 byte[] buff = newbyte[1024 * 4];

 try {

     while ((c = input.read(buff)) != -1) {

       fos.write(buff, 0, c);

       }

     input.close();

     fos.flush();

 } finally {

    fos.close();

        }

}

public void getObject(String bucketName, String objectName, String imageParams, File destFile) throws Exception {

        String date = DATE_FMT.format(new Date());

        String authorization = authorize("GET", date, bucket, objectName + imageParams);

        URL url = newURL("http", host, 80, "/" + bucket + "/" + objectName + imageParams);

HttpURLConnectionconn = (HttpURLConnection) url.openConnection();

conn.setUseCaches(false);

conn.setRequestProperty("Date", date);

conn.setRequestProperty("Authorization", authorization);

conn.setConnectTimeout(CONN_TIMEOUT);

conn.setReadTimeout(READ_TIMEOUT);

conn.setDoInput(true);

conn.setRequestMethod("GET");

conn.connect();

downloadInputStream(conn.getInputStream(), destFile);

    }

}