本篇内容介绍了“Nginx代理输出缩放图片怎么实现”的有关知识，在实际案例的操作过程中，不少人都会遇到这样的困境，接下来就让小编带领大家学习一下如何处理这些情况吧！希望大家仔细阅读，能够学有所成！
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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.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
* /upload/otherpic63/19154.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。
“Nginx代理输出缩放图片怎么实现”的内容就介绍到这里了，感谢大家的阅读。如果想了解更多行业相关的知识可以关注创新互联网站，小编将为大家输出更多高质量的实用文章！
