idea 创建java项目，引入第三方jar，打包jar包

ゞ浴缸里的玫瑰 2024-03-22 03:30 32阅读 0赞

#### 目录 ####

*   *  一、新建并运行项目
     *  二、下载第三方Jar
     *  三、引入第三方Jar
     *  四、将项目打成Jar包

### 一、新建并运行项目 ###

前提：已安装好JDK，并且配置好了JDK环境变量。

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NjEwMTgzOQ_size_16_color_FFFFFF_t_70][]

直接点击create创建即可

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NjEwMTgzOQ_size_16_color_FFFFFF_t_70 1][]

刚创建完的项目可能是没有out目录的，当我们执行一次main方法，代码会经过编译，然后生成out目录

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NjEwMTgzOQ_size_16_color_FFFFFF_t_70 2][]

打印输出结果，我们第一个java Hello word 就执行完啦。

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NjEwMTgzOQ_size_16_color_FFFFFF_t_70 3][]

创建Java文件和包

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NjEwMTgzOQ_size_16_color_FFFFFF_t_70 4][]

### 二、下载第三方Jar ###

下载jar包的网站：[https://mvnrepository.com/][https_mvnrepository.com]

（1）搜索要下载的框架

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NjEwMTgzOQ_size_16_color_FFFFFF_t_70 5][]

（2）选择要下载的版本

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NjEwMTgzOQ_size_16_color_FFFFFF_t_70 6][]

（3）选择下载jar

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NjEwMTgzOQ_size_16_color_FFFFFF_t_70 7][]

（4）查看下载的jar

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NjEwMTgzOQ_size_16_color_FFFFFF_t_70 8][]

### 三、引入第三方Jar ###

点击File -> Project Structure

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NjEwMTgzOQ_size_16_color_FFFFFF_t_70 9][]

选择Libraries -> + -> Java

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NjEwMTgzOQ_size_16_color_FFFFFF_t_70 10][]

选择刚刚下载的jar，就可以引入到项目里了

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NjEwMTgzOQ_size_16_color_FFFFFF_t_70 11][]

点击ok

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NjEwMTgzOQ_size_16_color_FFFFFF_t_70 12][]

然后点击Apply -> ok 进行保存

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NjEwMTgzOQ_size_16_color_FFFFFF_t_70 13][] ![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NjEwMTgzOQ_size_16_color_FFFFFF_t_70 14][]

hutool官网：[https://www.hutool.cn/][https_www.hutool.cn]

> hutool提供了大量的API供我们使用，而且还是国人开发的，官网很简洁，每个工具类都有用法示例，对于新手来说简直就是开发神器，上面就使用到了hutool当中提供的DateUtil打印当前时间。

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NjEwMTgzOQ_size_16_color_FFFFFF_t_70 15][]

### 四、将项目打成Jar包 ###

点击File -> Project Structure

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NjEwMTgzOQ_size_16_color_FFFFFF_t_70 9][]

点击Artifacts -> +（加号） -> Jar -> From modules

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NjEwMTgzOQ_size_16_color_FFFFFF_t_70 16][]

这里主要是需要指定Main方法所在的类，还有两个选项决定了Jar包结构，下面我会使用这两种方式分别进行打包演示

*  extract to the target JAR ：假如项目引入了第三方Jar，会将第三方Jar解压并合并到当前项目进行打包
 *  copy to the output directory and link via manifest：假如项目引入了第三方Jar，并不会将第三方Jar打包到当前项目的Jar，而是选择分开。

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NjEwMTgzOQ_size_16_color_FFFFFF_t_70 17][]

然后Apply -> ok 进行保存

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NjEwMTgzOQ_size_16_color_FFFFFF_t_70 18][]

点击完会生成一个META-INF文件夹，这个我们不需要管

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NjEwMTgzOQ_size_16_color_FFFFFF_t_70 19][]

选择Build -> Build Artifacts

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NjEwMTgzOQ_size_16_color_FFFFFF_t_70 20][]

然后选择Build构建

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NjEwMTgzOQ_size_16_color_FFFFFF_t_70 21][]

执行过后打开当前项目的out目录，会发现生成了一个artifacts文件夹，这个文件夹就存放的是打出来的jar包

**（1）选择extract to the target JAR打出来的jar包：**

> 注意这里的文件大小，他会将我们引入的hutool的jar包解压一并打到该jar当中

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NjEwMTgzOQ_size_16_color_FFFFFF_t_70 22][]

jar包是可以解压的，我们将java-demo的jar解压后会发现hutool的源代码也在里面

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NjEwMTgzOQ_size_16_color_FFFFFF_t_70 23][]

运行jar：java -jar命令即可运行

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NjEwMTgzOQ_size_16_color_FFFFFF_t_70 24][]

**（2）选择copy to the output directory and link via manifest打出来的jar包：**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NjEwMTgzOQ_size_16_color_FFFFFF_t_70 25][]

这时候运行java -jar同样是可以运行成功的

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NjEwMTgzOQ_size_16_color_FFFFFF_t_70 26][]

倘若一旦删除hutool包后再次运行就会异常

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NjEwMTgzOQ_size_16_color_FFFFFF_t_70 27][]

以上就是打包的两种区别。

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[https_mvnrepository.com]: https://mvnrepository.com/
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[https_www.hutool.cn]: https://www.hutool.cn/
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