浅谈java如何生成分享海报工具类

<!--谷歌图片压缩-->

        <dependency>

            <groupid>net.coobird</groupid>

            <artifactid>thumbnailator</artifactid>

        </dependency>

        <!--谷歌图片压缩-->

        <dependency>

            <groupid>com.google.guava</groupid>

            <artifactid>guava</artifactid>

        </dependency>

        <!--生成二维码-->

        <dependency>

            <groupid>cn.hutool</groupid>

            <artifactid>hutool-extra</artifactid>

            <version> 5.4 . 3 </version>

        </dependency>

        <dependency>

            <groupid>com.google.zxing</groupid>

            <artifactid>core</artifactid>

            <version> 3.3 . 3 </version>

        </dependency>

        <!--生成二维码-->

/**

    * 生成用户的邀请二维码

    *

    * @param userid 用户id

    */

   @getmapping ( "qrcode" )

   @nologin

   public object qrcode( @loginuser integer userid) {

       //判断用户id是否为空

       if (userid == null ) {

           return responseutil.fail( "请选择用户" );

       }

       //获取生成海报的图片路径

       string filepath = wxuserservice.qrcode(userid);

       return responseutil.ok(filepath);

   }

/**

   * 根据用户的邀请码生成分享海报

   *

   * @param userid

   * @return

   */

  string qrcode(integer userid);

/**

    * 根据用户的邀请码生成分享海报

    *

    * @param userid

    * @return

    */

   @override

   public string qrcode(integer userid) {

       try {

           // 根据用户id查询验证码

           userinfo userinfo = userservice.selectbyid(userid);

           //判断是否库是否存在海报地址

           if (!stringutils.isempty(userinfo.getposter())) {

               return userinfo.getposter();

           }

           //要生成海报的模板(一般在springboot工程的 resources下 我的工程路径:templates/poster/xjcq.png  可以改成自己工程需要的路径)

           file hbpath = resourceutils.getfile( "classpath:templates/poster/xjcq.png" );

           //要生成二维码的logo(一般在springboot工程的 resources下 我的工程路径:templates/poster/xjcqlogo.png 可以改成自己工程需要的路径)

           file logopath = resourceutils.getfile( "classpath:templates/poster/xjcqlogo.png" );

           // 获取上传后的路径

           string filepath = imageutil.drawstring(qrcodeinvitescheme + userinfo.getinvitecode(), userinfo.getinvitecode(), userinfo.getinvitecode(), hbpath, logopath);

           //file转multipartfile(因为我们的oss是转multipartfile)

           file file = new file(filepath);

           inputstream inputstream = new fileinputstream(file);

           multipartfile multipartfile = new mockmultipartfile(file.getname(), file.getname(),

                   contenttype.application_octet_stream.tostring(), inputstream);

           //上转至阿里云

           string s = storageutil.uploadossfile(multipartfile);

           //更改数据库

           userinfo updateuserinfo = new userinfo();

           updateuserinfo.setid(userinfo.getid());

           updateuserinfo.setposter(s);

           userservice.updatebyid(updateuserinfo);

           return updateuserinfo.getposter();

       } catch (filenotfoundexception e) {

           log.error( "文件找不到:{}" , e);

       } catch (ioexception e) {

           log.error( "io异常:{}" , e);

       }

       return null ;

   }

package com.legend.core.config;

import lombok.data;

import org.springframework.beans.factory.annotation.value;

import org.springframework.stereotype测试数据ponent;

/**

  * 获取全局配置path

  * @author admin

  */

@component

@data

public class wordpath {

      //生成电子合同的路径

      @value ( "${word.path}" )

      private string wordpath;

      //生成海报的路径

      @value ( "${poster.path}" )

      private string posterpath;

}

package com.legend.core.util;

import cn.hutool.extra.qrcode.qrcodeutil;

import cn.hutool.extra.qrcode.qrconfig;

import com.google.zxing.qrcode.decoder.errorcorrectionlevel;

import com.legend.core.config.wordpath;

import lombok.extern.slf4j.slf4j;

import org.apache测试数据mons.io.ioutils;

import org.springframework.core.io.defaultresourceloader;

import org.springframework.core.io.resourceloader;

import org.springframework.stereotype.service;

import javax.annotation.resource;

import javax.imageio.imageio;

import javax.imageio.stream.imageoutputstream;

import java.awt.*;

import java.awt.image.bufferedimage;

import java.io.*;

/**

  * 生成分享好友

  *

  * @author 生成分享好友

  */

@service

@slf4j

public class imageutil {

     //我把生成海报地址的路径配置到了springboot的yml配置文件中了

     @resource

     private wordpath wordpath;

     /**

      * 生成海报

      *

      * @param content  二维码内容

      * @param written  文字内容

      * @param filepath 保存文件 例:1.png    (d:/1.png)

      * @param hbpath   海报图片地址 例:1.png   (d:/1.png)

      * @param logopath 二维码logo

      * @return

      * @author uncle

      * @description 在一张背景图上添加二维码

      * @date 2020-09-28 23:59

      */

     public string drawstring(string content, string written, string filepath, file hbpath, file logopath) {

         try {

             bufferedimage image = addwater(content, hbpath, logopath);

             graphics2d gd = image.creategraphics();

             // 3、设置对线段的锯齿状边缘处理

             gd.setrenderinghint(renderinghints.key_interpolation, renderinghints.value_interpolation_bilinear);

             // 5、设置水印文字颜色

             gd.setcolor(color.darkgray);

             // 6、设置水印文字font

             gd.setfont( new font( "苹方" , font.plain, 32 ));

             // 8、第一参数->设置的内容，后面两个参数->文字在图片上的坐标位置(x,y)

             gd.drawstring(written, 440 , 1122 );

             gd.dispose();

             bytearrayoutputstream bs = new bytearrayoutputstream();

             imageoutputstream imout = imageio.createimageoutputstream(bs);

             imageio.write(image, "png" , imout);

             inputstream inputstream = new bytearrayinputstream(bs.tobytearray());

             // 获取yml海报的配置

             string file = wordpath.getposterpath() + filepath + ".png" ;

             if (! new file(wordpath.getposterpath()).exists()) {

                 new file(wordpath.getposterpath()).mkdirs();

             }

             outputstream outstream = new fileoutputstream(file);

             ioutils.copy(inputstream, outstream);

             inputstream.close();

             outstream.close();

             // 返回文件地址

             return file;

         } catch (exception e) {

             log.error( "海报生成失败:" , e);

         }

         return null ;

     }

     /***

      * 在一张背景图上添加二维码

      */

     public bufferedimage addwater(string content, file hbpath, file logopath) throws exception {

         // 读取原图片信息

         //得到文件

         //file file = new file(hbpath);

         //文件转化为图片

         image srcimg = imageio.read(hbpath);

         //获取图片的宽

         int srcimgwidth = srcimg.getwidth( null );

         //获取图片的高

         int srcimgheight = srcimg.getheight( null );

         // 加水印

         bufferedimage bufimg = new bufferedimage(srcimgwidth, srcimgheight, bufferedimage.type_int_rgb);

         graphics2d g = bufimg.creategraphics();

         g.drawimage(srcimg, 0 , 0 , srcimgwidth, srcimgheight, null );

         //使用工具类生成二维码

         image image = createqrcode(content, 230 , 230 , logopath);

         //将小图片绘到大图片上,500,300 .表示你的小图片在大图片上的位置。

         g.drawimage(image, 25 , 1070 , null );

         //设置颜色。

         g.setcolor(color.white);

         g.dispose();

         return bufimg;

     }

     private bufferedimage createqrcode(string content, int width, int height, file logopath) throws ioexception {

         qrconfig config = new qrconfig(width, height);

         if (logopath != null ) {

             image image = imageio.read( new fileinputstream(logopath));

             config.setimg(image);

         }

         config.seterrorcorrection(errorcorrectionlevel.h);

         return qrcodeutil.generate(

                 content,

                 config);

     }

     public inputstream resourceloader(string filefullpath) throws ioexception {

         resourceloader resourceloader = new defaultresourceloader();

         return resourceloader.getresource(filefullpath).getinputstream();

     }

}