利用Nginx 代理输出缩放图片

nginx 配置文件：

# document ppt convert  Configuration.
upstream document.polyv.net {
    server 127.0.0.1:8080;
}

server {
    listen 80;
    server_name document.polyv.net;
    index index.html index.htm;
    charset utf-8;
    client_max_body_size    1000m;

    # ignore favicon.ico not exist.
    location = /favicon.ico {
        log_not_found off;
        access_log off;
    }

    # not allow to visit hidden files.
    location ~ /\. {
        deny all;
        access_log off;
        log_not_found off;
    }

    location / {
        if ($request_filename ~* ^.*?\.(txt|doc|pdf|rar|gz|zip|docx|exe|xlsx|ppt|pptx)$) {
            add_header Content-Disposition: 'attachment;';
            add_header Content-Type: 'APPLICATION/OCTET-STREAM';
        }

        proxy_pass http://document.polyv.net;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header REQUEST_HOST $host;

        # include proxy.conf;
        charset UTF-8;
    }

    # user upload files
    location /images/ {
            #expires 7d;
        alias /data03/ovp/blobs/;
            proxy_store on;
            proxy_store_access user:rw group:rw all:rw;
            proxy_set_header Accept-Encoding "";
            if ( !-f $request_filename ) {
                proxy_pass http://document.polyv.net;
            }
    }

    location /blobs/ {
            #expires 7d;
        alias /data03/ovp/blobs/;
    }

        location /preview/images/ {
            #expires 7d;
            alias /data03/ovp/blobs/;
            proxy_store on;
            proxy_store_access user:rw group:rw all:rw;
            proxy_set_header Accept-Encoding "";
            if ( !-f $request_filename ) {
                proxy_pass http://document.polyv.net;
            }
        }

}

代理输出缩放图片

package com.document.handle.controller;import java.io.BufferedInputStream;
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.ServletRequestUtils;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;import com.document.tool.ImageMagickUtils;
import com.document.tool.SystemConfig;@Controller
public class ImageAgentController {

    private static final Logger LOG = LoggerFactory.getLogger(ImageAgentController.class);/**
     * ppt预览图片代理输出
     * @throws IOException
     */
    @RequestMapping("/preview/images/{year}/{month}/{md5id}/{preview}/{filename}.{ext}")
    public void cropImage(@PathVariable String year, @PathVariable String month, @PathVariable String md5id,
            @PathVariable String preview, @PathVariable String filename, @PathVariable String ext,
            HttpServletRequest request, HttpServletResponse response) throws IOException {
        // String rootDir = "/data03/ovp/blobs/";
        String rootDir = SystemConfig.getBlobDirectory();
        String oname = filename.substring(1, filename.length());// 原图文件名
        String dirString = rootDir + year + "/" + month + "/" + md5id + "/" + oname + "." + ext;
        String targetFileString = rootDir + year + "/" + month + "/" + md5id + "/preview/" + filename + "." + ext;        //如果原图存在
        File originImage = new File(oname);
        if(originImage.exists()){
            LOG.info("corpImage..." + dirString + " -> " + targetFileString);
            File newfile = new File(targetFileString);
            String pathString = newfile.getParent();
            LOG.info("pathString...{} {}", pathString);
            File pathFile = new File(pathString);
            if (!pathFile.exists()) {
                LOG.info("---create file---");
                pathFile.mkdirs();
            }
            boolean status = ImageMagickUtils.scale(dirString, targetFileString, 240, 180);
            if (status) {
                response.reset();
                response.setContentType("image/" + ext);                java.io.InputStreamin = new java.io.FileInputStream(targetFileString);
                // FilenameUrlUtils.getImageFilename(targetFileString);                if (in != null) {
                    byte[] b = new byte[1024];
                    int len;
                    while ((len = in.read(b)) != -1) {
                        response.getOutputStream().write(b);
                    }

                    in.close();
                }
            }
        }else{
            LOG.info("原图目录不存在-preview：{}",dirString); 
        }
    }


    /**
     * ppt固定尺寸图片代理输出
     * @throws IOException
     * http://document.polyv.net/images/2016/03/de37d2ceb11ac068c18c5e4428541075/jpg-3/1000x540.png
     *
     * http://document.polyv.net/images/2016/03/de37d2ceb11ac068c18c5e4428541075/jpg-3.png
     */
    @RequestMapping("/images/{year}/{month}/{md5id}/{filename}/{width}x{height}.{ext}")
    public void cropfixedImage(@PathVariable String year, @PathVariable String month, @PathVariable String md5id,
            @PathVariable String filename, @PathVariable Integer width, @PathVariable Integer height, @PathVariable String ext,
            HttpServletRequest request, HttpServletResponse response) throws IOException {
        // String rootDir = "/data03/ovp/blobs/";
        String rootDir = SystemConfig.getBlobDirectory();
        //String oname = filename.substring(1, filename.length());// 原图文件名
        String dirString = rootDir + year + "/" + month + "/" + md5id + "/" + ( filename + "." + ext);
        String targetFileString = rootDir + year + "/" + month + "/" + md5id + "/" + filename + "/" + (width + "x" + height + "." + ext);        //如果原图存在
        File originImage = new File(dirString);
        if(originImage.exists()){
            File targetFileStringFile = new File(targetFileString);
            if(!targetFileStringFile.exists()){
                LOG.info("corpImage..." + dirString + " -> " + targetFileString);
                File newfile = new File(targetFileString);
                String pathString = newfile.getParent();
                LOG.info("pathString...{} {}", pathString);
                File pathFile = new File(pathString);
                if (!pathFile.exists()) {
                    LOG.info("---create file---");
                    pathFile.mkdirs();
                }
                ImageMagickUtils.resizeWH(dirString, targetFileString,width,height);
            }
            response.setContentType("image/" + ext);
            java.io.InputStreamin = null;
            try{
                in = new java.io.FileInputStream(targetFileString);
                response.setContentLength(in.available());
                byte[] buffer = new byte[1024];
                int count = 0;
                while ((count = in.read(buffer)) > 0) {
                    response.getOutputStream().write(buffer, 0, count);
                }
                response.flushBuffer();
            }catch(Exception e){
                e.printStackTrace();
            }finally {
                try {
                    in.close();
                } catch (Exception e) {

                }
            }
        }else{
            LOG.info("原图目录不存在：{}",dirString);
        }




    }


    /**
     * 图片下载
     */
    @RequestMapping("get/image/data")
    public void downloadImage(HttpServletRequest request, HttpServletResponse response) throws IOException {  
        String filePath = ServletRequestUtils.getStringParameter(request, "filePath", ""); //图片访问路劲
        String fileName = ServletRequestUtils.getStringParameter(request, "fileName", ""); //名称        if(StringUtils.isNotBlank(filePath) || StringUtils.isNotBlank(fileName)){
            String destUrl = filePath;
            //LOG.info("--------------"+filePath); 
            String fileFormat=filePath.substring(filePath.lastIndexOf("."));
            //String name=fileName.trim()+fileFormat;
            String name=filePath.substring(filePath.lastIndexOf("/")+1, filePath.length()); 
            //File f = new File(filePath);
            //response.setHeader("Content-Disposition", "attachment; filename="+java.net.URLEncoder.encode(f.getName(),"UTF-8"));  
            //LOG.info("--------------"+f.getName());            // 建立链接  
            URL url = new URL(destUrl);  
            HttpURLConnection httpUrl = (HttpURLConnection) url.openConnection();  
            // 连接指定的资源  
            httpUrl.connect();  
            // 获取网络输入流  
            BufferedInputStream bis = new BufferedInputStream(httpUrl.getInputStream());              Integer lenf=httpUrl.getContentLength();
            //String lenf=this.getFileLength(4189053, 7189053);
            response.setContentType("application/x-msdownload"); 
            response.setHeader("Content-Length", lenf.toString());//文件大小值5几M
            response.setHeader("Content-Disposition", "attachment; filename="+java.net.URLEncoder.encode(name,"UTF-8"));
            OutputStream out = response.getOutputStream();
            byte[] buf = new byte[1024];  
            if (destUrl != null) {  
                BufferedInputStream br = bis;  
                int len = 0;  
                while ((len = br.read(buf)) > 0){  
                    out.write(buf, 0, len);  
                }                 
                br.close();  
            }  
            out.flush();  out.close();  
        }

    } 

}

图片缩放的业务

package com.document.tool;

import java.io.IOException;

import javax.swing.ImageIcon;

import org.apache.commons.exec.CommandLine;
import org.apache.commons.exec.DefaultExecuteResultHandler;
import org.apache.commons.exec.DefaultExecutor;
import org.apache.commons.exec.ExecuteException;
import org.apache.commons.exec.ExecuteWatchdog;
import org.apache.commons.exec.Executor;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * 使用ImageMagick对图片文件进行处理的工具类。
 * @author XingNing OU
 */publicabstractclassImageMagickUtils {privatestaticfinal String EXECUTABLE_CONVERT = "/usr/bin/convert"; // convert命令privatestaticfinal String EXECUTABLE_COMPOSITE = "/usr/bin/composite"; // composite命令privatestaticfinallong EXECUTE_TIMEOUT = 30 * 60 * 1000L; // 30 minutesprivatestaticfinal Logger LOG = LoggerFactory.getLogger(ImageMagickUtils.class);

    /**
     * 执行图片处理的命令。
     * @param cmdLine 待执行的命令
     * @return exitValue，一般等于0时表示正常运行结束
     * @throws ExecuteException 命令执行失败时抛出此异常
     * @throws IOException 当发生IO错误时抛出此异常
     * @throws InterruptedException 当等待异步返回结果被中断时抛出此异常
     */publicstaticintexecuteCommandLine(CommandLine cmdLine) throws ExecuteException, IOException,
    InterruptedException {
        Executor executor = new DefaultExecutor();
        executor.setExitValue(0);

        // Kill a run-away process after EXECUTE_TIME milliseconds.
        ExecuteWatchdog watchdog = new ExecuteWatchdog(EXECUTE_TIMEOUT);
        executor.setWatchdog(watchdog);

        // Execute the print job asynchronously.
        DefaultExecuteResultHandler resultHandler = new DefaultExecuteResultHandler();
        executor.execute(cmdLine, resultHandler);

        // Some time later the result handler callback was invoked.
        resultHandler.waitFor();

        // So we can safely request the exit value.return resultHandler.getExitValue();
    }

    /**
     * 按照高宽比例缩小图片。
     * @param src 源图片
     * @param dst 目标图片
     * @param width 图片图片的宽度
     * @param height 目标图片的高度
     * @return 是否处理成功
     */publicstaticbooleanscale(String src, String dst, int width, int height) {
        // 构建命令
        CommandLine cmdLine = new CommandLine(EXECUTABLE_CONVERT);
        cmdLine.addArgument(src);
        cmdLine.addArgument("-scale");
        cmdLine.addArgument(width + "x" + height);
        cmdLine.addArgument(dst);

        try {
            executeCommandLine(cmdLine);
            returntrue;
        } catch (Exception e) {
            LOG.error("缩略图片时发生异常，Cause: ", e);
            returnfalse;
        }
    }

    /**
     * 按照高宽比例缩小图片。
     * @param src 源图片
     * @param dst 目标图片
     * @param width 图片图片的宽度
     * @param height 目标图片的高度
     * @return 是否处理成功
     */publicstaticbooleanthumbnail(String src, String dst, int width, int height) {
        // 构建命令
        CommandLine cmdLine = new CommandLine(EXECUTABLE_CONVERT);
        cmdLine.addArgument(src);
        cmdLine.addArgument("-thumbnail");
        cmdLine.addArgument(width + "x" + height);
        cmdLine.addArgument(dst);

        try {
            executeCommandLine(cmdLine);
            returntrue;
        } catch (Exception e) {
            LOG.error("缩略图片时发生异常，Cause: ", e);
            returnfalse;
        }
    }

    /**
     * 添加图片水印。
     * @param src 源图片
     * @param dst 目标图片
     * @param logofile 水印图片
     * @param dissolve 和水印的融合度,0-100的数字
     * @param gravity 叠放方向,East,West,North,South,NorthEast,NorthWest,SouthEast,SouthWest
     * @return 是否处理成功
     */publicstaticbooleandrawLogo(String src, String dst, String logofile, int dissolve, String gravity) {
        // 构建命令
        CommandLine cmdLine = new CommandLine(EXECUTABLE_COMPOSITE);
        cmdLine.addArgument("-dissolve");
        cmdLine.addArgument(dissolve + "%");
        cmdLine.addArgument("-gravity");
        cmdLine.addArgument(gravity);
        cmdLine.addArgument(logofile);
        cmdLine.addArgument(src);
        cmdLine.addArgument(dst);

        try {
            executeCommandLine(cmdLine);
            returntrue;
        } catch (Exception e) {
            LOG.error("添加图片水印时发生异常，Cause: ", e);
            returnfalse;
        }
    }

    /**
     * 添加图片水印。
     * @param src 源图片
     * @param dst 目标图片
     * @param logofile 水印图片
     * @param dissolve 和水印的融合度,0-100的数字
     * @param x 水印距离左下角的距离
     * @param y 水印距离右下角的距离
     * @return 是否处理成功
     */publicstaticbooleandrawLogo(String src, String dst, String logofile, int dissolve, int x, int y) {
        ImageIcon icon = new ImageIcon(src);
        int width = icon.getIconWidth(); // 源图的宽int height = icon.getIconHeight(); // 源图的高        String _x = String.valueOf(width - x); // 在x轴上水印图片的左上顶点距离图片左上角的距离
        String _y = String.valueOf(height - y); // 在y轴上水印图片的左上顶点距离图片左上角的距离// 构建命令
        CommandLine cmdLine = new CommandLine(EXECUTABLE_COMPOSITE);
        cmdLine.addArgument("-dissolve");
        cmdLine.addArgument(dissolve + "%");
        cmdLine.addArgument("-geometry");
        cmdLine.addArgument(_x + "+" + _y);
        cmdLine.addArgument(logofile);
        cmdLine.addArgument(src);
        cmdLine.addArgument(dst);

        try {
            executeCommandLine(cmdLine);
            returntrue;
        } catch (Exception e) {
            LOG.error("添加图片水印时发生异常，Cause: ", e);
            returnfalse;
        }
    }

    /**
     * 裁剪图片。
     * @param src 源图片
     * @param dst 目标图片
     * @param width 目标宽度
     * @param height 目标高度
     * @param left 裁剪位置：距离左边的像素
     * @param top 裁剪位置：距离上边的像素
     * @return 是否处理成功
     */publicstaticbooleancrop(String src, String dst, int width, int height, int left, int top) {
        // 构建命令
        CommandLine cmdLine = new CommandLine(EXECUTABLE_CONVERT);
        cmdLine.addArgument(src);
        cmdLine.addArgument("-crop");
        cmdLine.addArgument(width + "x" + height + "+" + left + "+" + top);
        cmdLine.addArgument(dst);

        try {
            executeCommandLine(cmdLine);
            returntrue;
        } catch (Exception e) {
            LOG.error("裁剪图片时发生异常，Cause: ", e);
            returnfalse;
        }
    }

    /**
     * 获取矩形的小图。
     * @param src 源图片
     * @param dst 目标图片
     * @param width 目标宽度
     * @param height 目标高度
     * @param left 裁剪位置：距离左边的像素
     * @param top 裁剪位置：距离上边的像素
     * @return 是否处理成功
     */publicstaticbooleancropRect(String src, String dst, int width, int height, int left, int top) {
        ImageIcon icon = new ImageIcon(src);
        int origWidth = icon.getIconWidth();
        int origHeight = icon.getIconHeight();
        int[] s = newint[2];
        if (origWidth // 以宽为标准