Idea Java Gradle创建项目,添加依赖,引用本地jar,打包jar

2020年最后一天，没什么重要的事，就简单研究研究Idea的Gradle

idea版本:2020.2

首先创建项目，选Gradle->java

填好项目名和包名 

然后Finish

创建好后发现没有包和Main.java类，只好自己创建

右上角没法run

在Main.java类内右键->Run 'Main.main()'

看到输出test

项目运行成功，试着在build.gradle添加okhttp

dependencies {
    testCompile group: 'junit', name: 'junit', version: '4.12'
    compile("com.squareup.okhttp3:okhttp:4.9.0")
}

按ctrl+shift+o,刷新一下或者按下下图按钮

写上okhttp代码测试一下

package com.hyq.hm.test.gradle;
import okhttp3.*;
import org.jetbrains.annotations.NotNull;
import java.io.IOException;
import java.util.Objects;
public class Main {
    public static void main(String[] args){
        System.out.println("test");
        String url = "http://wwww.baidu.com";
        OkHttpClient okHttpClient = new OkHttpClient();
        final Request request = new Request.Builder()
                .url(url)
                .get()
                .build();
        Call call = okHttpClient.newCall(request);
        call.enqueue(new Callback() {
            @Override
            public void onFailure(@NotNull Call call, @NotNull IOException e) {
                System.out.println("onFailure");
            }

            @Override
            public void onResponse(@NotNull Call call, @NotNull Response response) throws IOException {
                System.out.println("onResponse: " + Objects.requireNonNull(response.body()).string());
            }
        });
    }
}

run一下

成功

接下来添加本地jar包了，就拿opencv 4.4.0来举例

首先在项目目录内创建一个lib文件夹

将opencv的jar包复制到lib文件夹内

点击idea的右上角的Edit Configurations...

在VM options:内填上opencv_java440.dll的文件夹路径

在build.gradle的dependencies内添加代码

dependencies {
    testCompile group: 'junit', name: 'junit', version: '4.12'
//    compile("com.squareup.okhttp3:okhttp:4.9.0")
    compile fileTree(dir:'lib',includes:['*jar'])
}

按ctrl+shift+o刷新一下

创建ImageGUI.java来显示,也可以跳过这个，我只是显示看看

package com.hyq.hm.test.gradle;
import javax.swing.*;
import java.awt.*;
import java.awt.event.ComponentAdapter;
import java.awt.event.ComponentEvent;
import java.awt.image.BufferedImage;
public class ImageGUI extends JComponent{
    private BufferedImage image;
    @Override
    protected void paintComponent(Graphics g) {
        int width = g.getClipBounds().width;
        int height = g.getClipBounds().height;
        Graphics2D g2d = (Graphics2D)g;
        g2d.setPaint(Color.WHITE);
        g2d.fillRect(0, 0, width, height);
        if(image != null)  {
            int[] rect = viewportSize(width, height,image.getWidth(),image.getHeight());
            g2d.drawImage(image, rect[0], rect[1], rect[2], rect[3], null);
        }
    }


    private JFrame ui;



    public void createWin(String title) {
        ui = new JFrame();
        ui.setLayout(null);
        ui.setTitle(title);
        ui.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);


        int viewWidth = 800;
        int viewHeight = (int) (9.0f/16.0f*viewWidth);

        setBounds(0,0,viewWidth,viewHeight);

        ui.add(this);

        ui.setSize(viewWidth,viewHeight);
        ui.setVisible(true);
        ui.addComponentListener(new ComponentAdapter() {
            @Override
            public void componentResized(ComponentEvent e) {
                int width = ui.getSize().width;
                int height = ui.getSize().height;
                setSize(width, height);
            }
        });
    }

    private int[] viewportSize(int screenWidth, int screenHeight, int width, int height) {
        int left, top, viewWidth, viewHeight;
        float sh = screenWidth * 1.0f / screenHeight;
        float vh = width * 1.0f / height;
        if (sh < vh) {
            left = 0;
            viewWidth = screenWidth;
            viewHeight = (int) (height * 1.0f / width * viewWidth);
            top = (screenHeight - viewHeight) / 2;
        } else {
            top = 0;
            viewHeight = screenHeight;
            viewWidth = (int) (width * 1.0f / height * viewHeight);
            left = (screenWidth - viewWidth) / 2;
        }
        return new int[]{left, top, viewWidth, viewHeight};
    }
    public void imshow(BufferedImage image) {
        this.image = image;
        this.repaint();
    }
}

在Main.java内添加代码

package com.hyq.hm.test.gradle;
import org.opencv.core.Core;
import org.opencv.core.CvType;
import org.opencv.core.Mat;
import org.opencv.core.Scalar;

import java.awt.image.BufferedImage;
import java.awt.image.DataBufferByte;

public class Main {
    static {
        System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
    }
    public static void main(String[] args){
        System.out.println("test");
        Mat mat = new Mat(100,100, CvType.CV_8UC3,new Scalar(255,0,0));
        ImageGUI gui = new ImageGUI();
        gui.createWin("test");
        gui.imshow(toImage(mat));
    }
    public static BufferedImage toImage(Mat matrix) {
        int type = BufferedImage.TYPE_BYTE_GRAY;
        if (matrix.channels() == 3) {
            type = BufferedImage.TYPE_3BYTE_BGR;
        }else if(matrix.channels() == 4){
            type = BufferedImage.TYPE_4BYTE_ABGR;
        }
        int bufferSize = matrix.channels() * matrix.cols() * matrix.rows();
        byte[] buffer = new byte[bufferSize];
        matrix.get(0, 0, buffer);
        BufferedImage image = new BufferedImage(matrix.cols(), matrix.rows(), type);
        final byte[] targetPixels = ((DataBufferByte) image.getRaster().getDataBuffer()).getData();
        System.arraycopy(buffer, 0, targetPixels, 0, buffer.length);
        return image;
    }
}

run一下

好了，引用本地jar也结束了，该打包了

对build.gradle内进行修改和添加代码

apply plugin: 'java'
apply plugin: 'idea'

group 'com.hyq.hm.test.gradle'
version '1.0-SNAPSHOT'

repositories {
    mavenCentral()
}


dependencies {
    testCompile group: 'junit', name: 'junit', version: '4.12'
    compile("com.squareup.okhttp3:okhttp:4.9.0")
    compile fileTree(dir:'lib',includes:['*jar'])
}
jar {
    String someString = ''
    configurations.runtime.each { someString = someString + " lib\\" + it.name }
    manifest {
        attributes 'Main-Class': 'com.hyq.hm.test.gradle.Main'
        attributes 'Class-Path': someString
    }
}
task clearPj(type:Delete){
    delete 'build','target'
}
task copyJar(type:Copy){
    from configurations.runtime
    into ('build/libs/lib')
}
task release(type: Copy,dependsOn: [build,copyJar]){

}

按ctrl+shift+o刷新一下

然后View->Tool Windows->Gradle

双击release

等编译结束后在项目的build文件夹内多出了一个libs文件夹，点开

将opencv_java440.dll也拷贝进来

打开控制台运行一下

打包部分参考文章:最全面的使用idea和gradle把java项目打包成jar的方法

本文地址：https://blog.csdn.net/u010302327/article/details/112005370