Nginx代理輸出縮放圖片怎么實現

本篇內容介紹了“Nginx代理輸出縮放圖片怎么實現”的有關知識，在實際案例的操作過程中，不少人都會遇到這樣的困境，接下來就讓小編帶領大家學習一下如何處理這些情況吧！希望大家仔細閱讀，能夠學有所成！

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;
???}
??}
}

代理輸出縮放圖片

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預覽圖片代理輸出
??*?@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());//?原圖文件名
??string?dirstring?=?rootdir?+?year?+?"/"?+?month?+?"/"?+?md5id?+?"/"?+?oname?+?"."?+?ext;
??string?targetfilestring?=?rootdir?+?year?+?"/"?+?month?+?"/"?+?md5id?+?"/preview/"?+?filename?+?"."?+?ext;
??//如果原圖存在
??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("原圖目錄不存在-preview：{}",dirstring);?
??}
?}
?/**
??*?ppt固定尺寸圖片代理輸出
??*?@throws?ioexception
??*?https://cache.yisu.com/upload/ask_collection/20210726/113/19154.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());//?原圖文件名
??string?dirstring?=?rootdir?+?year?+?"/"?+?month?+?"/"?+?md5id?+?"/"?+?(?filename?+?"."?+?ext);
??string?targetfilestring?=?rootdir?+?year?+?"/"?+?month?+?"/"?+?md5id?+?"/"?+?filename?+?"/"?+?(width?+?"x"?+?height?+?"."?+?ext);
??//如果原圖存在
??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("原圖目錄不存在：{}",dirstring);
??}
?}
?/**
??*?圖片下載
??*/
?@requestmapping("get/image/data")
?public?void?downloadimage(httpservletrequest?request,?httpservletresponse?response)?throws?ioexception?{?
??string?filepath?=?servletrequestutils.getstringparameter(request,?"filepath",?"");?//圖片訪問路勁
??string?filename?=?servletrequestutils.getstringparameter(request,?"filename",?"");?//名稱
??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());
???//?建立鏈接?
???url?url?=?new?url(desturl);?
???httpurlconnection?httpurl?=?(httpurlconnection)?url.openconnection();?
???//?連接指定的資源?
???httpurl.connect();?
???//?獲取網絡輸入流?
???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幾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();?
??}
?}?
}

圖片縮放的業務

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對圖片文件進行處理的工具類。
?*?@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);
?/**
??*?執行圖片處理的命令。
??*?@param?cmdline?待執行的命令
??*?@return?exitvalue，一般等于0時表示正常運行結束
??*?@throws?executeexception?命令執行失敗時拋出此異常
??*?@throws?ioexception?當發生io錯誤時拋出此異常
??*?@throws?interruptedexception?當等待異步返回結果被中斷時拋出此異常
??*/
?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();
?}
?/**
??*?按照高寬比例縮小圖片。
??*?@param?src?源圖片
??*?@param?dst?目標圖片
??*?@param?width?圖片圖片的寬度
??*?@param?height?目標圖片的高度
??*?@return?是否處理成功
??*/
?public?static?boolean?scale(string?src,?string?dst,?int?width,?int?height)?{
??//?構建命令
??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("縮略圖片時發生異常，cause:?",?e);
???return?false;
??}
?}
?/**
??*?按照高寬比例縮小圖片。
??*?@param?src?源圖片
??*?@param?dst?目標圖片
??*?@param?width?圖片圖片的寬度
??*?@param?height?目標圖片的高度
??*?@return?是否處理成功
??*/
?public?static?boolean?thumbnail(string?src,?string?dst,?int?width,?int?height)?{
??//?構建命令
??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("縮略圖片時發生異常，cause:?",?e);
???return?false;
??}
?}
?/**
??*?添加圖片水印。
??*?@param?src?源圖片
??*?@param?dst?目標圖片
??*?@param?logofile?水印圖片
??*?@param?dissolve?和水印的融合度,0-100的數字
??*?@param?gravity?疊放方向,east,west,north,south,northeast,northwest,southeast,southwest
??*?@return?是否處理成功
??*/
?public?static?boolean?drawlogo(string?src,?string?dst,?string?logofile,?int?dissolve,?string?gravity)?{
??//?構建命令
??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("添加圖片水印時發生異常，cause:?",?e);
???return?false;
??}
?}
?/**
??*?添加圖片水印。
??*?@param?src?源圖片
??*?@param?dst?目標圖片
??*?@param?logofile?水印圖片
??*?@param?dissolve?和水印的融合度,0-100的數字
??*?@param?x?水印距離左下角的距離
??*?@param?y?水印距離右下角的距離
??*?@return?是否處理成功
??*/
?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();?//?源圖的寬
??int?height?=?icon.geticonheight();?//?源圖的高
??string?_x?=?string.valueof(width?-?x);?//?在x軸上水印圖片的左上頂點距離圖片左上角的距離
??string?_y?=?string.valueof(height?-?y);?//?在y軸上水印圖片的左上頂點距離圖片左上角的距離
??//?構建命令
??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("添加圖片水印時發生異常，cause:?",?e);
???return?false;
??}
?}
?/**
??*?裁剪圖片。
??*?@param?src?源圖片
??*?@param?dst?目標圖片
??*?@param?width?目標寬度
??*?@param?height?目標高度
??*?@param?left?裁剪位置：距離左邊的像素
??*?@param?top?裁剪位置：距離上邊的像素
??*?@return?是否處理成功
??*/
?public?static?boolean?crop(string?src,?string?dst,?int?width,?int?height,?int?left,?int?top)?{
??//?構建命令
??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("裁剪圖片時發生異常，cause:?",?e);
???return?false;
??}
?}
?/**
??*?獲取矩形的小圖。
??*?@param?src?源圖片
??*?@param?dst?目標圖片
??*?@param?width?目標寬度
??*?@param?height?目標高度
??*?@param?left?裁剪位置：距離左邊的像素
??*?@param?top?裁剪位置：距離上邊的像素
??*?@return?是否處理成功
??*/
?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)?{?//?以寬為標準
???s?=?getsize(origwidth,?origheight,?width,?height,?1);
??}?else?{//?以高為標準
???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;
?}
?/**
??*?加邊框。
??*?@param?src?源圖片
??*?@param?dst?目標圖片
??*?@param?borderwidth?邊框的寬度
??*?@param?borderheight?邊框的高度
??*?@param?bordercolor?邊框的顏色
??*?@return?是否處理成功
??*/
?public?static?boolean?border(string?src,?string?dst,?int?borderwidth,?int?borderheight,?string?bordercolor)?{
??//?構建命令
??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("加圖片邊框時發生異常，cause:?",?e);
???return?false;
??}
?}
?/**
??*?轉換圖片格式。
??*?@param?src?源圖片
??*?@param?dst?目標圖片
??*?@param?format?轉換的格式
??*?@return?是否處理成功
??*/
?public?static?boolean?format(string?src,?string?dst,?string?format)?{
??//?構建命令
??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("轉換圖片格式時發生異常，cause:?",?e);
???return?false;
??}
?}
?/**
??*?轉換無限極的tiff圖片。
??*/
?public?static?boolean?converttiff(string?src,?string?dst)?{??
??//?構建命令
??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("轉換圖片格式時發生異常，cause:?",?e);
???return?false;
??}
?}
?/**
??*?獲得要壓縮圖片的大小。
??*?@param?w?圖片的原寬度
??*?@param?h?圖片的原高度
??*?@param?width?標準寬
??*?@param?height?標準高
??*?@param?type?類型?1-以寬為標準壓縮?2-以高為標準壓縮?3-以比例大小壓縮
??*?@return?size[0]-要壓縮的寬度，?size[1]-要壓縮的高度
??*/
?public?static?int[]?getsize(double?w,?double?h,?double?width,?double?height,?int?type)?{
??if?(w?<?width)?{//?如果原寬度比標準寬度小
???width?=?w;
??}
??if?(h?<?height)?{//?如果原高度比標準高度小
???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;
?}
?/**
??*?指定寬度。
??*?@param?src
??*?@param?width
??*?@param?dst
??*/
?public?static?boolean?resize(string?src,?int?width,?string?dst)?{
??//?構建命令
??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("縮略圖片時發生異常，cause:?",?e);
???return?false;
??}
?}
?/**
??*?指定寬度、高度。
??*?@param?src
??*?@param?width
??*?@param?dst
??*/
?public?static?boolean?resizewh(string?src,string?dst,?int?width,?int?height?)?{
??//?構建命令
??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("縮略圖片時發生異常，cause:?",?e);
???return?false;
??}
?}
}

服務器上要安裝imagemagick。

“Nginx代理輸出縮放圖片怎么實現”的內容就介紹到這里了，感謝大家的閱讀。如果想了解更多行業相關的知識可以關注蝸牛博客網站，小編將為大家輸出更多高質量的實用文章！

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