之前有一片文章，是打包单个java文件的。这次想要将http://www.cnblogs.com/sxdcgaq8080/p/8398780.html 打包成jar包，发现这个java文件中引用了多个第三方的jar，想要单独进行编译都无法通过，更不要说打包成jar了。
所以就营运而生了这个需求，怎么打包单个java文件或多个java文件，将文件中引用的依赖的jar包共同打包成一个jar供别的项目引用。
本次本篇使用的工具是Maven中的
maven-assembly-plugin
插件。
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1.首先，需要新建一个maven项目，将单个或多个java文件拷贝到本项目中
例如，下面这个QR_Code.java文件
package com.sxd.util; import java.awt.Color; import java.awt.Font; import java.awt.Graphics; import java.awt.image.BufferedImage; import java.io.*; import java.util.HashMap; import java.util.Map; import javax.imageio.ImageIO; import com.google.zxing.*; import com.google.zxing.common.HybridBinarizer; import com.google.zxing.qrcode.QRCodeReader; import lombok.AllArgsConstructor; import lombok.Data; import lombok.NoArgsConstructor; import lombok.experimental.Accessors; import com.google.zxing.common.BitMatrix; import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel; /** * 二维码工具类 * @author SXD * @Date 2018.2.1 * */ public class QR_Code { private static int BLACK = 0x000000; private static int WHITE = 0xFFFFFF; /** * 内部类，设置二维码相关参数 */ @Data(staticConstructor = "of") @NoArgsConstructor @AllArgsConstructor @Accessors(chain = true) public class CodeModel { /** * 正文 */ private String contents; /** * 二维码宽度 */ private int width = 400; /** * 二维码高度 */ private int height = 400; /** * 图片格式 */ private String format = "png"; /** * 编码方式 */ private String character_set = "utf-8"; /** * 字体大小 */ private int fontSize = 12; /** * logo */ private File logoFile; /** * logo所占二维码比例 */ private float logoRatio = 0.20f; /** * 二维码下文字 */ private String desc; private int whiteWidth;//白边的宽度 private int[] bottomStart;//二维码最下边的开始坐标 private int[] bottomEnd;//二维码最下边的结束坐标 } /** * 1.创建最原始的二维码图片 * @param info * @return */ private BufferedImage createCodeImage(CodeModel info){ String contents = info.getContents() == null || "".equals(info.getContents()) ? "暂无内容" : info.getContents();//获取正文 int width = info.getWidth();//宽度 int height = info.getHeight();//高度 Map<EncodeHintType, Object> hint = new HashMap<EncodeHintType, Object>(); hint.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);//设置二维码的纠错级别【级别分别为M L H Q ，H纠错能力级别最高，约可纠错30%的数据码字】 hint.put(EncodeHintType.CHARACTER_SET, info.getCharacter_set());//设置二维码编码方式【UTF-8】 hint.put(EncodeHintType.MARGIN, 0); MultiFormatWriter writer = new MultiFormatWriter(); BufferedImage img = null; try { //构建二维码图片 //QR_CODE 一种矩阵二维码 BitMatrix bm = writer.encode(contents, BarcodeFormat.QR_CODE, width, height, hint); int[] locationTopLeft = bm.getTopLeftOnBit(); int[] locationBottomRight = bm.getBottomRightOnBit(); info.setBottomStart(new int[]{locationTopLeft[0], locationBottomRight[1]}); info.setBottomEnd(locationBottomRight); int w = bm.getWidth(); int h = bm.getHeight(); img = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB); for(int x=0;x<w;x++){ for(int y=0;y<h;y++){ img.setRGB(x, y, bm.get(x, y) ? BLACK : WHITE); } } } catch (WriterException e) { e.printStackTrace(); } return img; } /** * 2.为二维码增加logo和二维码下文字 * logo--可以为null * 文字--可以为null或者空字符串"" * @param info * @param output */ private void dealLogoAndDesc(CodeModel info, OutputStream output){ //获取原始二维码图片 BufferedImage bm = createCodeImage(info); //获取Logo图片 File logoFile = info.getLogoFile(); int width = bm.getWidth(); int height = bm.getHeight(); Graphics g = bm.getGraphics(); //处理logo if(logoFile!=null && logoFile.exists()){ try{ BufferedImage logoImg = ImageIO.read(logoFile); int logoWidth = logoImg.getWidth(); int logoHeight = logoImg.getHeight(); float ratio = info.getLogoRatio();//获取Logo所占二维码比例大小 if(ratio>0){ logoWidth = logoWidth>width*ratio ? (int)(width*ratio) : logoWidth; logoHeight = logoHeight>height*ratio ? (int)(height*ratio) : logoHeight; } int x = (width-logoWidth)/2; int y = (height-logoHeight)/2; //根据logo 起始位置 和 宽高 在二维码图片上画出logo g.drawImage(logoImg, x, y, logoWidth, logoHeight, null); }catch(Exception e){ e.printStackTrace(); } } //处理二维码下文字 String desc = info.getDesc(); if(!(desc == null || "".equals(desc))){ try{ //设置文字字体 int whiteWidth = info.getHeight()-info.getBottomEnd()[1]; Font font = new Font("黑体", Font.BOLD, info.getFontSize()); int fontHeight = g.getFontMetrics(font).getHeight(); //计算需要多少行 int lineNum = 1; int currentLineLen = 0; for(int i=0;i<desc.length();i++){ char c = desc.charAt(i); int charWidth = g.getFontMetrics(font).charWidth(c); if(currentLineLen+charWidth>width){ lineNum++; currentLineLen = 0; continue; } currentLineLen += charWidth; } int totalFontHeight = fontHeight*lineNum; int wordTopMargin = 4; BufferedImage bm1 = new BufferedImage(width, height+totalFontHeight+wordTopMargin-whiteWidth, BufferedImage.TYPE_INT_RGB); Graphics g1 = bm1.getGraphics(); if(totalFontHeight+wordTopMargin-whiteWidth>0){ g1.setColor(Color.WHITE); g1.fillRect(0, height, width, totalFontHeight+wordTopMargin-whiteWidth); } g1.setColor(new Color(BLACK)); g1.setFont(font); g1.drawImage(bm, 0, 0, null); width = info.getBottomEnd()[0]-info.getBottomStart()[0]; height = info.getBottomEnd()[1]+1; currentLineLen = 0; int currentLineIndex = 0; int baseLo = g1.getFontMetrics().getAscent(); for(int i=0;i<desc.length();i++){ String c = desc.substring(i, i+1); int charWidth = g.getFontMetrics(font).stringWidth(c); if(currentLineLen+charWidth>width){ currentLineIndex++; currentLineLen = 0; g1.drawString(c, currentLineLen + whiteWidth, height+baseLo+fontHeight*(currentLineIndex)+wordTopMargin); currentLineLen = charWidth; continue; } g1.drawString(c, currentLineLen+whiteWidth, height+baseLo+fontHeight*(currentLineIndex) + wordTopMargin); currentLineLen += charWidth; } g1.dispose(); bm = bm1; }catch(Exception e){ e.printStackTrace(); } } try{ ImageIO.write(bm, (info.getFormat() == null || "".equals(info.getFormat())) ? info.getFormat() : info.getFormat(), output); }catch(Exception e){ e.printStackTrace(); } } /** * 3.创建 带logo和文字的二维码 * @param info * @param file */ public void createCodeImage(CodeModel info, File file){ File parent = file.getParentFile(); if(!parent.exists())parent.mkdirs(); OutputStream output = null; try{ output = new BufferedOutputStream(new FileOutputStream(file)); dealLogoAndDesc(info, output); output.flush(); }catch(Exception e){ e.printStackTrace(); }finally{ try { output.close(); } catch (IOException e) { e.printStackTrace(); } } } /** * 3.创建 带logo和文字的二维码 * @param info * @param filePath */ public void createCodeImage(CodeModel info, String filePath){ createCodeImage(info, new File(filePath)); } /** * 4.创建 带logo和文字的二维码 * @param filePath */ public void createCodeImage(String contents,String filePath){ CodeModel codeModel = new CodeModel(); codeModel.setContents(contents); createCodeImage(codeModel, new File(filePath)); } /** * 5.读取 二维码 获取二维码中正文 * @param input * @return */ public String decode(InputStream input){ Map<DecodeHintType, Object> hint = new HashMap<DecodeHintType, Object>(); hint.put(DecodeHintType.POSSIBLE_FORMATS, BarcodeFormat.QR_CODE); String result = ""; try{ BufferedImage img = ImageIO.read(input); int[] pixels = img.getRGB(0, 0, img.getWidth(), img.getHeight(), null, 0, img.getWidth()); LuminanceSource source = new RGBLuminanceSource(img.getWidth(), img.getHeight(), pixels); BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source)); QRCodeReader reader = new QRCodeReader(); Result r = reader.decode(bitmap, hint); result = r.getText(); }catch(Exception e){ result="读取错误"; } return result; } }
2.完善pom.xml文件，除了项目中依赖的jar的引用，还需要maven-assembly-plugin插件
<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.sxd.util</groupId> <artifactId>QR_Code</artifactId> <version>1.1-SNAPSHOT</version> <dependencies> <!--lombok--> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <version>1.16.20</version> </dependency> <!-- google提供二维码生成和解析https://mvnrepository.com/artifact/com.google.zxing/core --> <dependency> <groupId>com.google.zxing</groupId> <artifactId>core</artifactId> <version>3.3.2</version> </dependency> </dependencies> <build> <plugins> <plugin> <artifactId>maven-compiler-plugin</artifactId> <version>3.7.0</version> <configuration> <source>1.8</source> <target>1.8</target> </configuration> </plugin> <plugin> <artifactId> maven-assembly-plugin </artifactId> <configuration> <descriptorRefs> <descriptorRef>jar-with-dependencies</descriptorRef> </descriptorRefs> <archive> <manifest> <mainClass>com.sxd.util.QR_Code</mainClass> </manifest> </archive> </configuration> <executions> <execution> <id>make-assembly</id> <phase>package</phase> <goals> <goal>single</goal> </goals> </execution> </executions> </plugin> </plugins> </build> </project>
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【解释一下，直接使用的可以跳过】：
》》（1）打包出来的jar包，是以
<groupId>com.sxd.util</groupId> <artifactId>QR_Code</artifactId> <version>1.1-SNAPSHOT</version>
｛artifactId｝-｛version｝.jar命名的
》》（2）maven-assembly-plugin插件中
默认情况下，maven-assembly-plugin内置了几个可以用的assembly descriptor：
- bin ： 类似于默认打包，会将bin目录下的文件打到包中
- jar-with-dependencies ： 会将所有依赖都解压打包到生成物中【本次需求正好是将所有依赖也打包】
- src ：只将源码目录下的文件打包
- project ： 将整个project资源打包
》》（3）针对于maven-assembly-plugin插件中的
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3.使用IDEA的同志们，双击插件 即可执行打包指令
执行完整的语句如下：
"C:\Program Files\Java\jdk1.8.0_131\bin\java" -Dmaven.multiModuleProjectDirectory=G:\ideaProjects\B\sxdproject -Dmaven.home=C:\Users\SXD\AppData\Local\JetBrains\Toolbox\apps\IDEA-U\ch-0\173.3727.127\plugins\maven\lib\maven3 -Dclassworlds.conf=C:\Users\SXD\AppData\Local\JetBrains\Toolbox\apps\IDEA-U\ch-0\173.3727.127\plugins\maven\lib\maven3\bin\m2.conf -javaagent:C:\Users\SXD\AppData\Local\JetBrains\Toolbox\apps\IDEA-U\ch-0\173.3727.127\lib\idea_rt.jar=58262:C:\Users\SXD\AppData\Local\JetBrains\Toolbox\apps\IDEA-U\ch-0\173.3727.127\bin -Dfile.encoding=UTF-8 -classpath C:\Users\SXD\AppData\Local\JetBrains\Toolbox\apps\IDEA-U\ch-0\173.3727.127\plugins\maven\lib\maven3\boot\plexus-classworlds-2.5.2.jar org.codehaus.classworlds.Launcher -Didea.version=2017.3 org.apache.maven.plugins:maven-assembly-plugin:2.2-beta-5:assembly [INFO] Scanning for projects... [INFO] [INFO] ------------------------------------------------------------------------ [INFO] Building QR_Code 1.1-SNAPSHOT [INFO] ------------------------------------------------------------------------ [INFO] [INFO] >>> maven-assembly-plugin:2.2-beta-5:assembly (default-cli) > package @ QR_Code >>> [INFO] [INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ QR_Code --- [WARNING] Using platform encoding (UTF-8 actually) to copy filtered resources, i.e. build is platform dependent! [INFO] Copying 0 resource [INFO] [INFO] --- maven-compiler-plugin:3.7.0:compile (default-compile) @ QR_Code --- [INFO] Changes detected - recompiling the module! [WARNING] File encoding has not been set, using platform encoding UTF-8, i.e. build is platform dependent! [INFO] Compiling 1 source file to G:\ideaProjects\B\sxdproject\target\classes [INFO] [INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ QR_Code --- [WARNING] Using platform encoding (UTF-8 actually) to copy filtered resources, i.e. build is platform dependent! [INFO] skip non existing resourceDirectory G:\ideaProjects\B\sxdproject\src\test\resources [INFO] [INFO] --- maven-compiler-plugin:3.7.0:testCompile (default-testCompile) @ QR_Code --- [INFO] Nothing to compile - all classes are up to date [INFO] [INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ QR_Code --- [INFO] No tests to run. [INFO] [INFO] --- maven-jar-plugin:2.4:jar (default-jar) @ QR_Code --- [INFO] Building jar: G:\ideaProjects\B\sxdproject\target\QR_Code-1.1-SNAPSHOT.jar [INFO] [INFO] --- maven-assembly-plugin:2.2-beta-5:single (make-assembly) @ QR_Code --- [INFO] META-INF/MANIFEST.MF already added, skipping [INFO] Building jar: G:\ideaProjects\B\sxdproject\target\QR_Code-1.1-SNAPSHOT-jar-with-dependencies.jar [INFO] META-INF/MANIFEST.MF already added, skipping [INFO] [INFO] <<< maven-assembly-plugin:2.2-beta-5:assembly (default-cli) < package @ QR_Code <<< [INFO] [INFO] --- maven-assembly-plugin:2.2-beta-5:assembly (default-cli) @ QR_Code --- [INFO] META-INF/MANIFEST.MF already added, skipping [INFO] Building jar: G:\ideaProjects\B\sxdproject\target\QR_Code-1.1-SNAPSHOT-jar-with-dependencies.jar [INFO] META-INF/MANIFEST.MF already added, skipping [INFO] ------------------------------------------------------------------------ [INFO] BUILD SUCCESS [INFO] ------------------------------------------------------------------------ [INFO] Total time: 3.319 s [INFO] Finished at: 2018-02-01T16:30:47+08:00 [INFO] Final Memory: 23M/258M [INFO] ------------------------------------------------------------------------ Process finished with exit code 0
4.执行完成之后，项目结构会发生变化
5.把jar包拷出来，放在一个位置，就可以上传到nexus上，放在maven私服里，给大家引用了【nexus私服搭建以及相关操作，查看http://www.cnblogs.com/sxdcgaq8080/p/7583767.html】
当然，想更改jar的名字，也可以直接修改完成之后再进行如下操作
打开DOM窗口，执行如下命令
mvn deploy:deploy-file -DgroupId=sxd.jar -DartifactId=QR_Code -Dversion=1.1 -Dpackaging=jar -Dfile=G:\test\QR_Code-1.1-SNAPSHOT.jar -Durl=http://localhost:8081/repository/myself_hosted/ -DrepositoryId=myself_hosted
在http://localhost:8081/ 访问nexus
查询就可查看到
这样在项目中引用如下：
<!--QR_Code二维码使用工具包--> <dependency> <groupId>sxd.jar</groupId> <artifactId>QR_Code</artifactId> <version>1.1</version> </dependency>
6.最后，就可以把这个单独创建的项目 删除就好了
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参考地址：https://www.cnblogs.com/f-zhao/p/6929814.html
