blocks|key|1954248|text|是的，你的直觉很好。您不应该使用intellij的三个实例。您可以打开一个项目并添加应用程序的其他“部分”作为模块。通过项目浏览器添加，默认热键为alt%2B1|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1954249|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Yes, your intuition was good. You shouldn't use three instances of intellij. You can open one Project and add other 'parts' of application as Modules. Add them via project browser, default hotkey is alt+1

blocks|key|1741001|text|我认为最近的IntelliJ版本已经改善了这一点。在我的当前版本(12.0.2)中，您可以将任意数量的单独Maven项目添加到同一“工作空间”中。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1741002|我找到的最简单的方法是单击"Maven+Projects“窗口(View+>+Tool+Windows+>+Maven+Projects)中的小%2B图标，然后选择您想要导入的其他pom文件。|offset|length|style|CODE|1741003|entityMap^0|0|20|1|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@$D|L|E|M|F|G]]|9|@]|A|$]]|$1|H|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|I|$]]

I think this has improved with recent versions of IntelliJ. In my current version (12.0.2), you can add any number of separate Maven projects to the same "workspace". 

The simplest way I've found to do this is to click the little <code>+</code> icon in the "Maven Projects" window (View > Tool Windows > Maven Projects) and then select the additional pom file you want to import.

blocks|key|1954419|text|您可以使用import+module选项来打开它，就像在同一个导航器中打开eclipse一样。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1954420|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

you can use import module option which will open it just like eclipse in the same navigator.

blocks|key|1954507|text|没有必要将整个项目移动到一个模块中。与项目容器相比，模块的用例更加细粒度。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1954508|要在同一窗口中打开多个项目，请执行以下操作：|1954509|File+->打开项目|1954510|在此窗口中选择打开。|1954511|显示“添加到当前项目”的复选框。|1954512|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|M|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|N|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|O|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|P|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|K|$]]

There is no need to move entire projects to a module. The use case for module is a bit finer grained than as a project container.

To open multiple projects in the same window: 

File -> Open Project

Select open in this window.

Check box that says add to current project.

blocks|key|1954687|text|在IntelliJ+14.1.2中，我是这样做的：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1954688|选择File->Project+Structure->Modules.|offset|length|style|CODE|1954689|选择%2B和Import+Module，然后选择项目所在的目录(或pom所在的目录)，然后单击OK。|1954690|按照下一个屏幕流程进行操作，单击Finish之后，您应该会在现有项目旁边看到该项目。|1954691|​|1954692|📷|atomic|1954693|1954694|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/b49b1130786b74b1160d9842ae66329c.png|imageAlt^0|0|2|4|8|H|R|7|0|2|1|4|D|0|G|6|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|11|8|@$D|12|E|13|F|G]|$D|14|E|15|F|G]|$D|16|E|17|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|18|8|@$D|19|E|1A|F|G]|$D|1B|E|1C|F|G]]|9|@]|A|$]]|$1|J|3|K|5|6|7|1D|8|@$D|1E|E|1F|F|G]]|9|@]|A|$]]|$1|L|3|M|5|6|7|1G|8|@]|9|@]|A|$]]|$1|N|3|O|5|P|7|1H|8|@]|9|@$D|1I|E|1J|1|1K]]|A|$]]|$1|Q|3|M|5|6|7|1L|8|@]|9|@]|A|$]]|$1|R|3|-4|5|6|7|1M|8|@]|9|@]|A|$]]]|S|$T|$5|U|V|W|A|$X|Y|Z|-4]]]]

In IntelliJ 14.1.2, I did it like following:

Select <code>File</code>-><code>Project Structure</code>-><code>Modules</code>. 

Select <code>+</code> and <code>Import Module</code> and select the directory of your project(or directory where pom exists) and click OK. 

Follow through the next flow of screens and after you click <code>Finish</code>, you should see the project alongside your existing one. 

<img src="https://i.stack.imgur.com/s1fCh.png" alt="enter image description here">

blocks|key|1955084|text|要展开@Neo答案:选择您的目录后。选择import+module+from+external+model并选择您的模型(在本例中为maven)。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1955085|​|1955086|📷|atomic|1955087|1955088|然后从下一个对话框中选中keep+project+files选项。它会将所有文件保存在原始目录中。|1955089|1955090|1955091|1955092|你最终的项目结构应该是这样的。|1955093|1955094|1955095|1955096|现在您可以将您的模块作为依赖项添加到其他模块的pom.xml中，如果您更改了依赖项的源代码，Intellij会负责更新您的项目(不需要手动运行依赖项的mvn+build+)|1955097|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/90bcd446f7c9106fca10486ddf6a8773.png|imageAlt|1|https://ask.qcloudimg.com/http-save/yehe-900000/fb52d95fe5385f89ed97d95415b4c4b1.png|2|https://ask.qcloudimg.com/http-save/yehe-900000/32747e5a578b2d923d1f40ad32815d70.png^0|K|X|0|0|0|1|0|0|0|C|I|0|0|0|1|1|0|0|0|0|0|1|2|0|0|N|7|23|3|0^^$0|@$1|2|3|4|5|6|7|1A|8|@$9|1B|A|1C|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|1D|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|1E|8|@]|D|@$9|1F|A|1G|1|1H]]|E|$]]|$1|K|3|G|5|6|7|1I|8|@]|D|@]|E|$]]|$1|L|3|M|5|6|7|1J|8|@$9|1K|A|1L|B|C]]|D|@]|E|$]]|$1|N|3|G|5|6|7|1M|8|@]|D|@]|E|$]]|$1|O|3|I|5|J|7|1N|8|@]|D|@$9|1O|A|1P|1|1Q]]|E|$]]|$1|P|3|G|5|6|7|1R|8|@]|D|@]|E|$]]|$1|Q|3|R|5|6|7|1S|8|@]|D|@]|E|$]]|$1|S|3|G|5|6|7|1T|8|@]|D|@]|E|$]]|$1|T|3|I|5|J|7|1U|8|@]|D|@$9|1V|A|1W|1|1X]]|E|$]]|$1|U|3|G|5|6|7|1Y|8|@]|D|@]|E|$]]|$1|V|3|W|5|6|7|1Z|8|@$9|20|A|21|B|C]|$9|22|A|23|B|C]]|D|@]|E|$]]|$1|X|3|-4|5|6|7|24|8|@]|D|@]|E|$]]]|Y|$Z|$5|10|11|12|E|$13|14|15|-4]]|16|$5|10|11|12|E|$13|17|15|-4]]|18|$5|10|11|12|E|$13|19|15|-4]]]]

To expand @Neo answer:
after choosing your directory. select <code>import module from external model</code> and choose your model (maven in this case).

<a href="https://i.stack.imgur.com/mpC6A.png" rel="noreferrer"><img src="https://i.stack.imgur.com/mpC6A.png" alt="choose model"></a>

Then check <code>keep project files</code> option from next dialog. It will keep all files in original directory.

<a href="https://i.stack.imgur.com/RIMnj.png" rel="noreferrer"><img src="https://i.stack.imgur.com/RIMnj.png" alt="options"></a>

Your final project structure would be something like this. 

<a href="https://i.stack.imgur.com/0g8LO.png" rel="noreferrer"><img src="https://i.stack.imgur.com/0g8LO.png" alt="structure"></a>

Now you can add your module as dependency to other module's <code>pom.xml</code> and if you change the source code of your dependencies, Intellij takes care of updating your project (there is no need to run <code>mvn</code> build manually for dependencies)

blocks|key|1741904|text|打开preference+->外观和行为->+System+settings，然后选择(在新窗口中打开项目)，然后单击apply。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1741905|📷|atomic|offset|length|1741906|​|1741907|然后，您可以打开和编辑多个项目。|1741908|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/eab705ff14ed4a1e2c8ccfbf6caf4ade.png|imageAlt^0|0|0|1|0|0|0|0^^$0|@$1|2|3|4|5|6|7|T|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|U|8|@]|9|@$E|V|F|W|1|X]]|A|$]]|$1|G|3|H|5|6|7|Y|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|Z|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|10|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R|S|-4]]]]

Open preference -> appearance &amp; behaviour -> System settings -> select (open project in new window) then apply.<a href="https://i.stack.imgur.com/yx3c8.png" rel="noreferrer"><img src="https://i.stack.imgur.com/yx3c8.png" alt="enter image description here"></a>

Then you could open and edit multiple projects.

blocks|key|1955356|text|在将打开“项目结构”的窗口中按"F4“，然后单击"%2B”图标或"Alt+%2B+Insert“选择要导入的新项目；然后单击”确定“按钮...|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1955357|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Press "F4" on windows which will open up "Project Structure" and then click "+" icon or "Alt + Insert" to select a new project to be imported; then click OK button...

blocks|key|1955388|text|对于使用Gradle的用户也可以获得相同的好处：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1955389|​|1955390|📷|atomic|offset|length|1955391|1955392|1955393|1955394|1955395|转到:+1.查看-->工具窗口-->+Gradle+2.单击%2B按钮并添加您的build.gradle文件|style|CODE|1955396|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/5bf69effeee8cf3f96063b9ac7290a49.png|imageAlt|1|https://ask.qcloudimg.com/http-save/yehe-900000/f4c7a377f4fa53d1ec0126677b3a5fcd.png^0|0|0|0|1|0|0|0|0|0|1|1|0|0|U|1|12|C|0^^$0|@$1|2|3|4|5|6|7|11|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|12|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|13|8|@]|9|@$G|14|H|15|1|16]]|A|$]]|$1|I|3|C|5|6|7|17|8|@]|9|@]|A|$]]|$1|J|3|C|5|6|7|18|8|@]|9|@]|A|$]]|$1|K|3|E|5|F|7|19|8|@]|9|@$G|1A|H|1B|1|1C]]|A|$]]|$1|L|3|C|5|6|7|1D|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|1E|8|@$G|1F|H|1G|O|P]|$G|1H|H|1I|O|P]]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|1J|8|@]|9|@]|A|$]]]|R|$S|$5|T|U|V|A|$W|X|Y|-4]]|Z|$5|T|U|V|A|$W|10|Y|-4]]]]

For who uses Gradle can also avail the same:

<a href="https://i.stack.imgur.com/tcvIB.png" rel="noreferrer"><img src="https://i.stack.imgur.com/tcvIB.png" alt="enter image description here"></a>

<a href="https://i.stack.imgur.com/c1NZp.png" rel="noreferrer"><img src="https://i.stack.imgur.com/c1NZp.png" alt="enter image description here"></a>

Go to:
1. View --> Tool Windows --> Gradle
2. Click on the <code>+</code> button and add your <code>build.gradle</code> file

blocks|key|1742154|text|使用add+maven项目的按钮，进入项目的文件夹。然后，选择pom.xml文件并将其添加到IntelliJ中。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1742155|​|1742156|📷|atomic|1742157|1742158|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/1aeeca7afdf0962202a3c3744f41aca8.png|imageAlt^0|V|7|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|X|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|Y|8|@]|D|@$9|Z|A|10|1|11]]|E|$]]|$1|K|3|G|5|6|7|12|8|@]|D|@]|E|$]]|$1|L|3|-4|5|6|7|13|8|@]|D|@]|E|$]]]|M|$N|$5|O|P|Q|E|$R|S|T|-4]]]]

Use the button for the add maven projects and go inside the folder of the project. Then, select the <code>pom.xml</code> file and add them in the IntelliJ. 

<a href="https://i.stack.imgur.com/miHJr.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/miHJr.png" alt="enter image description here"></a>

blocks|key|1742173|text|从版本2019.2开始，这就像文件->附加项目一样简单。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1742174|​|1742175|1742176|📷|atomic|offset|length|1742177|1742178|请参阅：https://youtrack.jetbrains.com/issue/WEB-7968|1742179|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/27687082e0c916595c6a9588672dfa16.png|imageAlt|1|LINK|MUTABLE|url|https://youtrack.jetbrains.com/issue/WEB-7968^0|0|0|0|0|1|0|0|0|4|19|1|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|11|8|@]|9|@]|A|$]]|$1|D|3|C|5|6|7|12|8|@]|9|@]|A|$]]|$1|E|3|F|5|G|7|13|8|@]|9|@$H|14|I|15|1|16]]|A|$]]|$1|J|3|C|5|6|7|17|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|18|8|@]|9|@$H|19|I|1A|1|1B]]|A|$]]|$1|M|3|-4|5|6|7|1C|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|T|U|-4]]|V|$5|W|Q|X|A|$Y|Z]]]]

As of release 2019.2, this is as easy as File->Attach Project.



<a href="https://i.stack.imgur.com/rt3Hz.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/rt3Hz.png" alt="File-&gt;Attach Project"></a>

See: <a href="https://youtrack.jetbrains.com/issue/WEB-7968" rel="nofollow noreferrer">https://youtrack.jetbrains.com/issue/WEB-7968</a>

blocks|key|1742308|text|为了Intellij+IDEA+2019.2，F4+%2B点击模块，点击%2B表示从你的硬盘中添加任何项目，上面的菜单yo可以编辑集成开发环境与你创建的项目和更多的选项，非常简单|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1742309|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

To Intellij IDEA 2019.2, F4 + click on module, click to + for add any project from your HDD, above this menu yo can edit the IDE with you create the project and more options, very easy

blocks|key|1742590|text|自macOS+Big+Sur和IntelliJ+IDEA+2020.3.2以来，您可以使用“在macOS+Big+Sur上的标签中打开项目”功能。要使用它，您必须在系统设置中启用此功能：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1742591|System+Preferences+->+General+->+Prefer+tabs+[always]+when+opening+documents|style|CODE|1742592|​|1742593|📷|atomic|1742594|1742595|完成此步骤后，当您尝试在IntelliJ中打开第二个项目时，请选择New+Window+(是，选择New+Window，而不是This+Window)。|1742596|1742597|1742598|1742599|这应该会导致在同一窗口中打开新项目，但在新卡片中：|1742600|1742601|1742602|1742603|entityMap|0|LINK|mutability|MUTABLE|url|https://blog.jetbrains.com/idea/2021/01/intellij-idea-2020-3-2/|1|IMAGE|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/a31c0dba9396c79008145d1d46bb0dea.png|imageAlt|2|https://ask.qcloudimg.com/http-save/yehe-900000/f038a3e1c25504969e83bdbd480055ca.png|3|https://ask.qcloudimg.com/http-save/yehe-900000/0fb4b091b390412febb6b31414ee67e3.png^0|F|M|0|0|0|24|0|0|0|1|1|0|0|X|A|1D|A|1R|B|0|0|0|1|2|0|0|0|0|0|1|3|0|0^^$0|@$1|2|3|4|5|6|7|1F|8|@]|9|@$A|1G|B|1H|1|1I]]|C|$]]|$1|D|3|E|5|6|7|1J|8|@$A|1K|B|1L|F|G]]|9|@]|C|$]]|$1|H|3|I|5|6|7|1M|8|@]|9|@]|C|$]]|$1|J|3|K|5|L|7|1N|8|@]|9|@$A|1O|B|1P|1|1Q]]|C|$]]|$1|M|3|I|5|6|7|1R|8|@]|9|@]|C|$]]|$1|N|3|O|5|6|7|1S|8|@$A|1T|B|1U|F|G]|$A|1V|B|1W|F|G]|$A|1X|B|1Y|F|G]]|9|@]|C|$]]|$1|P|3|I|5|6|7|1Z|8|@]|9|@]|C|$]]|$1|Q|3|K|5|L|7|20|8|@]|9|@$A|21|B|22|1|23]]|C|$]]|$1|R|3|I|5|6|7|24|8|@]|9|@]|C|$]]|$1|S|3|T|5|6|7|25|8|@]|9|@]|C|$]]|$1|U|3|I|5|6|7|26|8|@]|9|@]|C|$]]|$1|V|3|K|5|L|7|27|8|@]|9|@$A|28|B|29|1|2A]]|C|$]]|$1|W|3|I|5|6|7|2B|8|@]|9|@]|C|$]]|$1|X|3|-4|5|6|7|2C|8|@]|9|@]|C|$]]]|Y|$Z|$5|10|11|12|C|$13|14]]|15|$5|16|11|17|C|$18|19|1A|-4]]|1B|$5|16|11|17|C|$18|1C|1A|-4]]|1D|$5|16|11|17|C|$18|1E|1A|-4]]]]

Since macOS Big Sur and <a href="https://blog.jetbrains.com/idea/2021/01/intellij-idea-2020-3-2/" rel="noreferrer">IntelliJ IDEA 2020.3.2</a> you can use &quot;open projects in tabs on macOS Big Sur&quot; feature. To use it, you have to enable this feature in your system settings:
<code>System Preferences -&gt; General -&gt; Prefer tabs [always] when opening documents</code>
<a href="https://i.stack.imgur.com/lGW6v.png" rel="noreferrer"><img src="https://i.stack.imgur.com/lGW6v.png" alt="enter image description here" /></a>
After this step, when you will try to open second project in IntelliJ, choose <code>New Window</code> (yes, <code>New Window</code>, not <code>This Window</code>).
<a href="https://i.stack.imgur.com/YamKJ.png" rel="noreferrer"><img src="https://i.stack.imgur.com/YamKJ.png" alt="enter image description here" /></a>
It should result with opening new project in same window, but in the new card:
<a href="https://i.stack.imgur.com/rxBXh.png" rel="noreferrer"><img src="https://i.stack.imgur.com/rxBXh.png" alt="enter image description here" /></a>

We build in maven multiple projects (let's name them A,B,C). Project A uses .jar of project B which uses .jar of project C.

I am modifying codes of all A/B/C projects, (A is MVC app, B are business services and C is some shared layer).

The thing is, in Eclipse/NetBeans I can see all of them at once and it's comfortable to modify them. In IDEA though, I have to open 3 instances (or n instances) of IntelliJ IDEA.

Am I missing something? Is there better approach when using IntelliJ? This is the biggest downside of IntelliJ for me atm.

IntelliJ: Working on multiple projects

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我们在maven中构建了多个项目(让我们将它们命名为A、B、C)。项目A使用项目B的.jar，项目B使用项目C的.jar。我正在修改所有A/B/C项目的代码，(A是MVC应用程序，B是业务服务，C是某个共享层)。问题是，在Eclipse/NetBeans中，我可以一次看到所有它们，修改它们很方便。但在IDEA中，我必须...

问IntelliJ:处理多个项目
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