服務端字節流輸出圖片

本文轉載自查看原文 2019-03-03 14:04 568 Java：強大的跨平台語言

import java.awt.image.BufferedImage;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletResponse;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

@Controller
@RequestMapping("/imgs/")
public class test {

    @RequestMapping("test")
    public void test(HttpServletResponse response) throws IOException {
        //寫給瀏覽器
        response.setContentType("image/jpeg");
        //瀏覽器不要緩存
        response.setDateHeader("expries", -1);
        response.setHeader("Cache-Control", "no-cache");
        response.setHeader("Pragma", "no-cache");
        BufferedImage buffImg = ImageIO.read(new FileInputStream("g://timg.jpg"));
        ImageIO.write(buffImg, "jpg", response.getOutputStream());
    }
    @RequestMapping("test1")
    public void test1(HttpServletResponse response) throws IOException {
        try {
            response.setContentType("image/jpeg");
            OutputStream toClient = response.getOutputStream();
            String xmlImg = GetImageStr("g://timg.jpg");
            GenerateImage(xmlImg, toClient);
        } catch (Exception ex) {
            System.out.println(ex.toString());
        }
    }
    
    @RequestMapping("test2")
    public void test2(HttpServletResponse response) throws IOException {
        try {
            response.setContentType("text/html");
            String xmlImg = GetImageStr("g://timg.jpg");
            System.out.println(xmlImg);
            response.getWriter().write("<html><body><img src='data:image/jpeg;base64,"+xmlImg+"'/></body></html>");
        } catch (Exception ex) {
            System.out.println(ex.toString());
        }
    }

    public static boolean GenerateImage(String imgStr, OutputStream out) {
        if (imgStr == null) // 圖像數據為空
            return false;
        BASE64Decoder decoder = new BASE64Decoder();
        try {
            // Base64解碼
            byte[] b = decoder.decodeBuffer(imgStr);
            for (int i = 0; i < b.length; ++i) {
                if (b[i] < 0) {
                    b[i] += 256;
                }
            }
            
            out.write(b);
            out.flush();
            out.close();
            return true;
        } catch (Exception e) {
            return false;
        }
    }

    public static String GetImageStr(String imgFilePath) {
        // 將圖片文件轉化為字節數組字符串，並對其進行Base64編碼處理
        byte[] data = null;

        // 讀取圖片字節數組
        try {
            InputStream in = new FileInputStream(imgFilePath);
            data = new byte[in.available()];
            in.read(data);
            in.close();
        } catch (IOException e) {
            e.printStackTrace();
        }

        // 對字節數組Base64編碼
        BASE64Encoder encoder = new BASE64Encoder();
        return encoder.encode(data);//返回字符串
    }
}

轉載來自：https://www.cnblogs.com/1-Admin/p/8029949.html

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