วิธีการ เพิ่ม JAR ใน Build Path ของโปรเจ็คต์ ด้วย Eclipse (Java)

หมายเหตุ: จะดีกว่าเยอะ ถ้าอ้างถึง JAR ที่มีอยู่แล้วใน project นี้หรือ project อื่นๆ เพราะใช้ dependencies ทั้งหมดกับ version control system ได้ (ยังไงคุณก็ ต้อง ใช้ version control อยู่แล้ว)

ให้เลือกหนึ่งในวิธีการต่อไปนี้

วิธีการที่ 1

แนะนำวิธีการนี้ เพราะถ้า project เดียวมีผู้พัฒนาหลายคน จะหา external jar ในที่ต่างๆ ได้ง่ายกว่า

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   1
   คลิกขวาที่ชื่อ project แล้วไปที่ Build Path .
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   2
   เลือก Configure Build Path... แล้วหน้าต่าง properties ของ project จะเปิดขึ้นมาพร้อมตัวปรับแต่ง build path .
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   3
   คลิก Add Variable... .
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   4
   คลิก Configure Variables... .
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   5
   คลิก New... .
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   6
   พิมพ์ชื่อตัวแปร (variable) ใหม่. เช่น ถ้าเป็น JAR ของ Tomcat ก็เป็น TOMCAT_JARS
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   7
   ไปยังโฟลเดอร์ที่มี JAR ที่จะใช้กับ path. (หรือเจาะจงไฟล์ jar ที่จะใช้กับตัวแปรก็ได้)
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   8
   คลิก Ok เพื่อ define ตัวแปร.
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   9
   คลิก Ok เพื่อปิดหน้าต่าง preferences.
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    10
    เลือกตัวแปรจากในรายการ.
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    11
    คลิก Extend... .
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    12
    เลือก JAR ที่จะเพิ่มใน classpath.
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    13
    คลิก Ok เพื่อปิดหน้าต่างที่ขยายออกมา.
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    14
    คลิก Ok เพื่อปิดหน้าต่างตัวแปร classpath.
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    15
    คลิก Ok เพื่อปิดหน้าต่างตั้งค่า build path.

    • ถ้าคุณแชร์ project กับคนอื่น เขาก็ต้อง define ตัวแปรด้วย ใน
      
      Window->Preferences->Java->Build Path->Classpath Variables
    โฆษณา

วิธีการที่ 2

ถ้าใช้วิธีนี้ external JAR ต้องอยู่ตำแหน่งเดียวกันในฮาร์ดไดรฟ์ ทุกคนถึงจะใช้ project นี้ได้ เลยทำให้แชร์ project เดียวกันยากหน่อย

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   1
   คลิกขวาที่ชื่อ project แล้วไปที่ Build Path .
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   2
   เลือก Add External Archives... .
   
   
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   3
   หาแล้วเลือก JAR ที่จะใช้ จากนั้นคลิก Open. JAR จะไปโผล่ใน Referenced Libraries
   โฆษณา

วิธีการที่ 3

ถ้าใช้วิธีนี้ external JAR ต้องอยู่ตำแหน่งเดียวกันในฮาร์ดไดรฟ์ ทุกคนถึงจะใช้ project นี้ได้ เลยทำให้แชร์ project เดียวกันยากหน่อย

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   1
   คลิกขวาที่ชื่อ project แล้วไปที่ Build Path .
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   2
   เลือก Configure Build Path... แล้วหน้าต่าง properties ของ project จะโผล่มาพร้อมตัวปรับแต่ง build path .
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   3
   เลือก tab Libraries .
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   4
   คลิก Add External JARs... .
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   5
   หาแล้วเลือก JAR ที่จะใช้ จากนั้นคลิก Open. JAR จะไปอยู่ในรายชื่อ libraries ของ build path
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   6
   คลิก OK เพื่อปิดหน้าต่าง properties. JAR จะไปอยู่ใน Referenced Libraries
   โฆษณา