Nginx代理输出缩放图片的方法

本文实例为大家分享了Nginx代理输出缩放图片的具体代码，供大家参考，具体内容如下

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;@Controllerpublic 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.InputStream in = 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  * https://cache.yisu.com/upload/information/20200622/115/54625.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.InputStream in = 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 */public abstract class ImageMagickUtils { private static final String EXECUTABLE_CONVERT = "/usr/bin/convert"; // convert命令 private static final String EXECUTABLE_COMPOSITE = "/usr/bin/composite"; // composite命令 private static final long EXECUTE_TIMEOUT = 30 * 60 * 1000L; // 30 minutes private static final 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  */ public static int executeCommandLine(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  */ public static boolean scale(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);   return true;  } catch (Exception e) {   LOG.error("缩略图片时发生异常，Cause: ", e);   return false;  } } /**  * 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  */ public static boolean thumbnail(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);   return true;  } catch (Exception e) {   LOG.error("缩略图片时发生异常，Cause: ", e);   return false;  } } /**  * 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  */ public static boolean drawLogo(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);   return true;  } catch (Exception e) {   LOG.error("添加图片水印时发生异常，Cause: ", e);   return false;  } } /**  * 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  */ public static boolean drawLogo(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);   return true;  } catch (Exception e) {   LOG.error("添加图片水印时发生异常，Cause: ", e);   return false;  } } /**  * 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  */ public static boolean crop(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);   return true;  } catch (Exception e) {   LOG.error("裁剪图片时发生异常，Cause: ", e);   return false;  } } /**  * 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  */ public static boolean cropRect(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 = new int[2];  if (origWidth < origHeight) { // 以宽为标准   s = getSize(origWidth, origHeight, width, height, 1);  } else {// 以高为标准   s = getSize(origWidth, origHeight, width, height, 2);  }  if (thumbnail(src, dst, s[0], s[1])) {   return crop(src, dst, width, height, left, top);  }  return false; } /**  * 加边框。  * @param src 源图片  * @param dst 目标图片  * @param borderWidth 边框的宽度  * @param borderHeight 边框的高度  * @param borderColor 边框的颜色  * @return 是否处理成功  */ public static boolean border(String src, String dst, int borderWidth, int borderHeight, String borderColor) {  // 构建命令  CommandLine cmdLine = new CommandLine(EXECUTABLE_CONVERT);  cmdLine.addArgument("-bordercolor");  cmdLine.addArgument(borderColor);  cmdLine.addArgument("-border");  cmdLine.addArgument(borderWidth + "x" + borderHeight);  cmdLine.addArgument(src);  cmdLine.addArgument(dst);  try {   executeCommandLine(cmdLine);   return true;  } catch (Exception e) {   LOG.error("加图片边框时发生异常，Cause: ", e);   return false;  } } /**  * 转换图片格式。  * @param src 源图片  * @param dst 目标图片  * @param format 转换的格式  * @return 是否处理成功  */ public static boolean format(String src, String dst, String format) {  // 构建命令  CommandLine cmdLine = new CommandLine(EXECUTABLE_CONVERT);  cmdLine.addArgument(src);  cmdLine.addArgument("-format");  cmdLine.addArgument("'" + format + "'");  cmdLine.addArgument(dst);  try {   executeCommandLine(cmdLine);   return true;  } catch (Exception e) {   LOG.error("转换图片格式时发生异常，Cause: ", e);   return false;  } } /**  * 转换无限极的TIFF图片。  */ public static boolean convertTiff(String src, String dst) {    // 构建命令  CommandLine cmdLine = new CommandLine(EXECUTABLE_CONVERT);  cmdLine.addArgument(src);  cmdLine.addArgument("-colorspace");  cmdLine.addArgument("RGB");  cmdLine.addArgument(dst);  try {   executeCommandLine(cmdLine);   return true;  } catch (Exception e) {   LOG.error("转换图片格式时发生异常，Cause: ", e);   return false;  } } /**  * 获得要压缩图片的大小。  * @param w 图片的原宽度  * @param h 图片的原高度  * @param width 标准宽  * @param height 标准高  * @param type 类型 1-以宽为标准压缩 2-以高为标准压缩 3-以比例大小压缩  * @return size[0]-要压缩的宽度， size[1]-要压缩的高度  */ public static int[] getSize(double w, double h, double width, double height, int type) {  if (w < width) {// 如果原宽度比标准宽度小   width = w;  }  if (h < height) {// 如果原高度比标准高度小   height = h;  }  double scale = w / h;  switch (type) {   case 1:    height = width / scale;    break;   case 2:    width = height * scale;    break;   case 3:    if (width / height > scale) {     width = height * scale;    } else if ((width / height) < scale) {     height = width / scale;    }    break;  }  int[] size = new int[2];  size[0] = (int) width;  size[1] = (int) height;  return size; } /**  * 指定宽度。  * @param src  * @param width  * @param dst  */ public static boolean resize(String src, int width, String dst) {  // 构建命令  CommandLine cmdLine = new CommandLine(EXECUTABLE_CONVERT);  cmdLine.addArgument(src);  cmdLine.addArgument("-resize");  cmdLine.addArgument(width + "");  cmdLine.addArgument(dst);  try {   executeCommandLine(cmdLine);   return true;  } catch (Exception e) {   LOG.error("缩略图片时发生异常，Cause: ", e);   return false;  } } /**  * 指定宽度、高度。  * @param src  * @param width  * @param dst  */ public static boolean resizeWH(String src,String dst, int width, int height ) {  // 构建命令  CommandLine cmdLine = new CommandLine(EXECUTABLE_CONVERT);  cmdLine.addArgument(src);  cmdLine.addArgument("-resize");  cmdLine.addArgument(width + "x" + height +"!");  cmdLine.addArgument(dst);  try {   executeCommandLine(cmdLine);   return true;  } catch (Exception e) {   LOG.error("缩略图片时发生异常，Cause: ", e);   return false;  } }}

服务器上要安装imagemagick。

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。