[完全版] 新人研修や本では教えてくれないJava！

(C) CASAREAL, Inc. All rights reserved. #ccc_f1 ৽ਓݚम΍ຊͰ͸ ڭ͑ͯ͘Εͳ͍+BWBʂ ʙϑϨʔϜϫʔΫͷ࢓૊Έͱ࣮຿ඞਢπʔϧΛֶ΅͏ʙ
ג ΧαϨΞϧଟాਅහ ++6($$$'BMM

(C) CASAREAL, Inc. All rights reserved. #ccc_f1 ͜ͷηογϣϯʹ͍ͭͯ ▸ ৽ਓݚम΍ࢢൢॻ੶Ͱ͸ͳ͔ͳ͔঺հ͞Εͳ͍
͕ɺ։ൃݱ৔Ͱ͸ॏཁʹͳΔ಺༰ΛϨΫνϟʔ ▸ +BWBॳ৺ऀɺ͓Αͼࢦಋ໾ͷઌഐ͕ର৅ 2

(C) CASAREAL, Inc. All rights reserved. #ccc_f1 ஫ҙ఺ ▸ ෼͔Γ΍͢͞Λ࠷ॏࢹͨͨ͠Ίɺٕज़తͳਖ਼֬
͞ʹ͚ܽΔ෦෼͕͋Δ͔΋͠Ε·ͤΜ ▸ ͓ؾ෇͖ͷ఺͕͋Ε͹ɺ  5XJUUFS౳Ͱ༏͘͠ࢦఠͯ͠΍͍ͬͯͩ͘͞ 3

(C) CASAREAL, Inc. All rights reserved. #ccc_f1 େࣄͳ͜ͱͳͷͰճݴ͍·͢ ▸༏͘͠  ࢦఠͯ͠΍͍ͬͯͩ͘͞
4

(C) CASAREAL, Inc. All rights reserved. #ccc_f1 ᶃ ৽ਓݚमͰڭ͑Δ+BWBɺڭ͑ͳ͍+BWB ᶄ
ϥΠϒϥϦΛ؆୯ʹ࢖͓͏ʂϏϧυπʔϧ.BWFO ᶅ 8FCࡾछͷਆثʂ8FCϑϨʔϜϫʔΫɾ  %*ίϯςφɾ03Ϛούʔ ᶆ ϑϨʔϜϫʔΫͷ࢓૊ΈΛ஌Ζ͏ʂ  ϦϑϨΫγϣϯͱΞϊςʔγϣϯ ᶇ τϥϒϧγϡʔςΟϯάʹඞਢʂ  ϩΪϯάϥΠϒϥϦ-PHCBDL ᶈ ͜Ε͔ΒͲ͏ֶश͢Δ͔ʁ 5

(C) CASAREAL, Inc. All rights reserved. #ccc_f1 ࣗݾ঺հ ▸ ଟాਅහʢ!TVLF@NBTBʣ
▸ ݚमτϨʔφʔ!ΧαϨΞϧ ▸ ઐ໳ɿ+BWB&&4QSJOH4XJGU ▸ (MBTT'JTI6TFS(SPVQ+BQBOӡӦϝϯόʔ ▸ +BWB&&(VBSEJBOT ▸ ++6($$$ग़৔ɿճ࿈ଓճ໨ 6

(C) CASAREAL, Inc. All rights reserved. #ccc_f1 Ұൠతͳ+BWB৽ਓݚम લ൒ ᶃ
ίϯϐϡʔλʔͷجૅʢʙ೔ؒʣ ▸ ίϯϐϡʔλʔͷେػೳɺωοτϫʔΫɺ%#42- ᶄ ϓϩάϥϛϯάͷجૅʢʙ೔ؒʣ ▸ ม਺ɺ৚݅෼ذɺ܁Γฦ͠ɺ഑ྻɺϝιου ᶅ ΦϒδΣΫτࢦ޲ʢʙ೔ؒʣ ▸ ΫϥεɺίϯετϥΫλɺΦʔόʔϩʔυɺܧঝɺΞΫηεम ০ࢠɺΦʔόʔϥΠυɺந৅ΫϥεɺΠϯλϑΣʔε 8

(C) CASAREAL, Inc. All rights reserved. #ccc_f1 Ұൠతͳ+BWB৽ਓݚम ޙ൒ ᶆ
ඪ४"1*ʢʙ೔ؒʣ ▸ 4USJOHɺϥούʔΫϥεɺ%BUFɺ4JNQMF%BUF'PSNBUɺ  'JMF3FBEFS8SJUFSɺ"SSBZ-JTUɺ)BTI.BQ ᶇ 8FCΞϓϦέʔγϣϯʢʙ೔ؒʣ ▸ αʔϒϨοτɺ+41ɺ+%#$ ᶈ ։ൃԋशʢʙ೔ؒʣ ‣ ʙਓͷάϧʔϓͰͷٖࣅϓϩδΣΫτ 9

(C) CASAREAL, Inc. All rights reserved. #ccc_f1 ৽ਓݚमͰ͸ڭΘΒͳ͍ ͜ͱ͕ଟ͍ +BWB
▸ ྻڍܕ &OVN ▸ ֦ுGPSจ ▸ USZXJUISFTPVSDFT ▸ ϥϜμࣜ4USFBN"1* ▸ %BUFBOE5JNF"1* 10 Java SE 5Ҏ߱ͷ৽ػೳ͸ ΄ͱΜͲशΘͳ͍ʂ ※ݱࡏ͸Java SE 8͕࠷৽ ※δΣωϦΫεͱΦʔτϘΫγϯά͸ ɹश͏͜ͱ͕ଟ͍

(C) CASAREAL, Inc. All rights reserved. #ccc_f1 ৽ਓݚमͰ͸ڭΘΒͳ͍ ͜ͱ͕ଟ͍ 8FC
▸ +45- ▸ )551ͷৄࡉ ▸ εςʔλείʔυɺϔομʔɺ$PPLJFͳͲ ▸ σʔλιʔε ▸ !8FC4FSWMFUΞϊςʔγϣϯ 11 ΧϦΩϡϥϜ͸ 15೥͘Β͍มΘͬͯͳ͍

(C) CASAREAL, Inc. All rights reserved. #ccc_f1 ͦ΋ͦ΋+BWB͸ྔ͕ଟ͍ʂ ▸ ʙϲ݄ؒͷ৽ਓݚमͰશ෦͸ڭ͖͑Εͳ͍
▸ ݚमҎ্ͷࣗݾֶश͸ඞਢ ▸ ྑॻ͸ଟ͍ͷͰࣗݾֶश͸Մೳʂ ▸ ࠷ޙʹ঺հ͠·͢ 12

(C) CASAREAL, Inc. All rights reserved. #ccc_f1 +BWB͸Φʔϓϯιʔε͕ॆ࣮ʂ ▸ ੈքதͷਓ͕ϥΠϒϥϦΛ࡞੒ɾެ։͍ͯ͠Δ
14 ͜Μͳͷ࡞ͬͨΑʂ ΈΜͳ࢖ͬͯʂ ͜Μͳͷ࡞ͬͨΑʂ ΈΜͳ࢖ͬͯʂ ͜Μͳͷ࡞ͬͨΑʂ ΈΜͳ࢖ͬͯʂ ͜Μͳͷ࡞ͬͨΑʂ ΈΜͳ࢖ͬͯʂ

(C) CASAREAL, Inc. All rights reserved. #ccc_f1 ໰୊఺ɿͲ͏΍ͬͯϥΠϒϥϦΛूΊΔʁ ▸ ֤ϥΠϒϥϦͷެࣜαΠτʹΞΫηε͢Δ 
ˠݸ਺͕ଟ͍ͱେม 15 ϥΠϒϥϦAͷ ެࣜαΠτ ϥΠϒϥϦBͷ ެࣜαΠτ ϥΠϒϥϦCͷ ެࣜαΠτ ϥΠϒϥϦDͷ ެࣜαΠτ ϥΠϒϥϦEͷ ެࣜαΠτ

(C) CASAREAL, Inc. All rights reserved. #ccc_f1 ໰୊఺ɿґଘੑ͸Ͳ͏΍ͬͯղܾ͢Δʁ ▸ ͋ΔϥΠϒϥϦ"͕ɺผͷϥΠϒϥϦ#ͱ$Λ࢖ͬ
͍ͯͯɺ#͸ߋʹ%ͱ&Λ࢖͍ͬͯΔ  ˠશ෦ௐ΂ͳ͖Ό͍͚ͳ͍ͷʁ 16 ϥΠϒϥϦA ϥΠϒϥϦB ϥΠϒϥϦC ϥΠϒϥϦD ϥΠϒϥϦE

(C) CASAREAL, Inc. All rights reserved. #ccc_f1 ໰୊఺ɿόʔδϣϯΞοϓͲ͏͢Δʁ ▸ ϥΠϒϥϦ"ͷόʔδϣϯΛ্͛Δͱɺґଘ͢Δ
ϥΠϒϥϦ΋ҶͮΔࣜʹ্͛ͳ͚Ε͹ͳΒͳ͍  ˠຖճɺಉ͡ௐࠪΛ͢Δͷʁ 17 ϥΠϒϥϦA 1.0->1.1 ϥΠϒϥϦB 2.1->2.3 ϥΠϒϥϦC 1.1.1->1.1.2 ϥΠϒϥϦD 4.3.0->5.0.0 ϥΠϒϥϦE 2.2.2->2.2.2

(C) CASAREAL, Inc. All rights reserved. #ccc_f1 ͦ͜Ͱ.BWFOʂ ▸ 9.-ʹඞཁͳϥΠϒϥϦΛॻ͚ͩ͘Ͱ
▸ ඞཁͳϥΠϒϥϦͷμ΢ϯϩʔυ΍ɺΫϥεύε΁ͷ௥ Ճ͕Ͱ͖Δʂ ▸ ґଘϥΠϒϥϦΛҶͮΔࣜʹऔಘͰ͖Δʂ ▸ όʔδϣϯΞοϓ͸ઃఆϑΝΠϧΛॻ͖׵͑Δ͚ͩʂ ▸ ݱࡏͰ͸ɺ+BWBϏϧυπʔϧͷσϑΝΫτελϯ μʔυ 18

(C) CASAREAL, Inc. All rights reserved. #ccc_f1 .BWFO$FOUSBM3FQPTJUPSZ ▸ Πϯλʔωοτ্ͷɺ΄ͱ
ΜͲͷΦʔϓϯιʔεϥΠ ϒϥϦ͕ू·͍ͬͯΔ৔ॴ ▸ 9.-ʹࢦఆͨ͠ϥΠϒϥϦ ͸ɺ͔͜͜Βμ΢ϯϩʔυ ͞ΕΔ ▸ IUUQTFBSDINBWFOPSH Ͱݕࡧ΋Մೳ 19 ϥΠϒϥϦ ϥΠϒϥϦ ϥΠϒϥϦ ϥΠϒϥϦ ϥΠϒϥϦ

(C) CASAREAL, Inc. All rights reserved. #ccc_f1 .BWFOͷΠϯετʔϧ ᶃ IUUQTNBWFOBQBDIFPSHEPXOMPBEDHJ 
͔Β;*1Λμ΢ϯϩʔυˠద౰ͳϑΥϧμʹల։ ᶄ ల։ઌϑΥϧμBQBDIFNBWFOCJOΛ؀ ڥม਺1"5)ʹ௥Ճ 20

(C) CASAREAL, Inc. All rights reserved. #ccc_f1 *%&Λ࢖͏ͱʁ ▸ *%&ʹ͸ݩ͔Β.BWFO͕಺แ͞Ε͍ͯΔ
▸ ͨͩ͠ɺίϚϯυϓϩϯϓτ͔Β.BWFOΛ࢖͏ ͜ͱ΋ଟ͍ ▸ ͳΔ΂͘ɺݸผʹ΋Πϯετʔϧ͠·͠ΐ͏ 21

(C) CASAREAL, Inc. All rights reserved. #ccc_f1 .BWFOϓϩδΣΫτͷ࡞੒ ᶃ<ϑΝΠϧ><৽ن>  <ͦͷଞ> 
<.BWFO>  <.BWFOϓϩδΣΫτ>  <࣍΁> ᶄ<γϯϓϧͳϓϩδΣΫτ ͷ࡞੒>ʹνΣοΫ  <࣍΁> 22

(C) CASAREAL, Inc. All rights reserved. #ccc_f1 .BWFOϓϩδΣΫτͷ࡞੒ ᶅ<άϧʔϓ*E>ͱ<ΞʔςΟ ϑΝΫτ*E>ʹద౰ʹೖྗ 
<ύοέʔδϯά>͸8FC ͳΒ<XBS>ɺͦΕҎ֎ͳ Β<KBS>  <׬ྃ> 23

(C) CASAREAL, Inc. All rights reserved. #ccc_f1 QPNYNMͷฤू ▸ ͜͜ʹඞཁͳϥΠϒϥϦΛهड़͢Δ
24 <?xml version="1.0" encoding="UTF-8"?> <project …> <!— தུ —> <dependencies> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> <version>4.3.4.RELEASE</version> <scope>compile</scope> </dependency> </dependencies>

(C) CASAREAL, Inc. All rights reserved. #ccc_f1 QPNYNMͷฤू ▸ ඞཁͳϥΠϒϥϦ͕ҶͮΔࣜʹμ΢ϯϩʔυ͞
ΕΔ 25

(C) CASAREAL, Inc. All rights reserved. #ccc_f1 EFQFOEFODZͷࢠཁૉ 26 ࢠཁૉ໊
ҙຯ groupId ϥΠϒϥϦΛ࡞੒͍ͯ͠Δஂମ໊ artifactId ϥΠϒϥϦ໊ version ϥΠϒϥϦͷόʔδϣϯ scope ʢޙड़ʣ

(C) CASAREAL, Inc. All rights reserved. #ccc_f1 EFQFOEFODZͷॻ͖ํΛௐ΂Δํ๏ ᶃIUUQTFBSDINBWFOPSHͰݕࡧ  ˠόʔδϣϯ൪߸ΛΫϦοΫ
▸ <BMM>ϦϯΫΛΫϦοΫ͢ΔͱɺશόʔδϣϯͷҰཡ͕ݟΕΔ 27

(C) CASAREAL, Inc. All rights reserved. #ccc_f1 EFQFOEFODZͷॻ͖ํΛௐ΂Δํ๏ ᶄ9.-͕ॻ͍ͯ͋ΔͷͰɺ ͜ΕΛίϐϖ͢Ε͹0,
▸ खॻ͖͢Δͱϛε͠·͢ 28

(C) CASAREAL, Inc. All rights reserved. #ccc_f1 ϥΠϒϥϦͷอଘ৔ॴ ▸ Ұ౓μ΢ϯϩʔυͨ͠ϥΠϒϥϦ͸ɺԼهͷϑΥ
ϧμʹอଘ͞ΕΔ ▸ 8JOEPXTˠ$a6TFSTaϢʔβʔ໊aNaSFQPTJUPSZ ▸ NBD04ˠ6TFSTϢʔβʔ໊NSFQPTJUPSZ 29

(C) CASAREAL, Inc. All rights reserved. #ccc_f1 +"3΁ͷύοέʔδϯά ▸ ίϚϯυϓϩϯϓτͰQPNYNM
͕͋ΔϑΥϧμʹҠಈ  ˠmvn packageίϚϯυΛ࣮ߦ  ˠUBSHFUϑΥϧμ͕࡞੒͞Εɺ  ɹͦͷதʹ+"3ϑΝΠϧ͕  ɹ࡞੒͞ΕΔ ▸ લʹ࡞੒ͨ͠+"3ͳͲΛ࡟আͯ͠ ࠶ύοέʔδϯά͍ͨ͠৔߹͸ mvn clean packageΛ࣮ߦ 30

(C) CASAREAL, Inc. All rights reserved. #ccc_f1 .BWFOϓϩδΣΫτͷϑΥϧμߏ଄ 31 ϓϩδΣΫτ
pom.xml src main test java resources java resources ιʔείʔυ ઃఆϑΝΠϧ ςετ༻ιʔείʔυ ςετ༻ઃఆϑΝΠϧ

(C) CASAREAL, Inc. All rights reserved. #ccc_f1 ϑΥϧμߏ଄ͱ+"3ύοέʔδϯά 32 ͚͕ͩ͜͜JARʹ
ؚ·ΕΔ

(C) CASAREAL, Inc. All rights reserved. #ccc_f1 $ jar -tf
target/maven-sample-1.0-SNAPSHOT.jar com/example/entity/Employee.class com/example/repository/EmployeeRepository.class jdbc.properties ϑΥϧμߏ଄ͱ+"3ύοέʔδϯά 33 src/main/java ͷத਎ src/main/resources ͷத਎ JARϑΝΠϧͷத਎ΛݟΔίϚϯυ ※Ұ෦লུ͍ͯ͠·͢

(C) CASAREAL, Inc. All rights reserved. #ccc_f1 8FCΞϓϦέʔγϣϯͷ৔߹ ▸ QPNYNMͰԼهͷΑ͏ʹࢦఆ
34 <?xml version="1.0" encoding="UTF-8"?> <project …> <groupId>com.example</groupId> <artifactId>maven-sample</artifactId> <version>1.0-SNAPSHOT</version> <packaging>war</packaging> <!— লུ —>

(C) CASAREAL, Inc. All rights reserved. #ccc_f1 8FCΞϓϦέʔγϣϯͷϑΥϧμߏ଄ 35 src
main test java resources java resources ιʔείʔυ ઃఆϑΝΠϧ ςετ༻ιʔείʔυ ςετ༻ઃఆϑΝΠϧ webapp WEB-INF web.xml JSPɺHTMLͳͲ ※εϖʔεͷ౎߹্ɺϓϩδΣΫτϑΥϧμͱpom.xml͸লུ͍ͯ͠·͢

(C) CASAREAL, Inc. All rights reserved. #ccc_f1 ϑΥϧμߏ଄ͱ8"3ύοέʔδϯά 36 WEB-INF/classes΁
WAR௚Լ΁

(C) CASAREAL, Inc. All rights reserved. #ccc_f1 $ jar -tf
target/maven-sample-1.0-SNAPSHOT.war index.jsp WEB-INF/web.xml WEB-INF/classes/com/example/entity/Employee.class WEB-INF/classes/com/example/repository/EmployeeRepository.class WEB-INF/classes/jdbc.properties WEB-INF/lib/commons-logging-1.2.jar WEB-INF/lib/spring-beans-4.3.4.RELEASE.jar WEB-INF/lib/spring-core-4.3.4.RELEASE.jar WEB-INF/lib/spring-jdbc-4.3.4.RELEASE.jar WEB-INF/lib/spring-tx-4.3.4.RELEASE.jar ϑΥϧμߏ଄ͱ8"3ύοέʔδϯά 37 src/main/java, src/main/resources pom.xmlʹࢦఆͨ͠ϥΠϒϥϦ ʢҶͮΔࣜʹඞཁͳ΋ͷ΋ؚΉʣ ※Ұ෦লུ͍ͯ͠·͢ src/main/webapp

(C) CASAREAL, Inc. All rights reserved. #ccc_f1 TDPQFͱ͸ 38 <dependency>
<groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> <version>4.3.4.RELEASE</version> <scope>compile</scope> </dependency> ▸ ͦͷϥΠϒϥϦ͕ ▸ ͲΜͳ࣌ʹΫϥεύεʹ௥Ճ͞ΕΔͷ͔ʁ ▸ 8"3ʹؚ·ΕΔͷ͔ʁʢʹ8&#*/'MJCʹೖΔͷ͔ʣ

(C) CASAREAL, Inc. All rights reserved. #ccc_f1 TDPQF͸ओʹछྨ 39 scope໊
ίϯύΠϧ ࣮ߦ ςετ WARʹؚ·ΕΔ compile (σϑΥϧτ) ̋ ̋ ̋ ̋ provided ̋ × × × runtime × ̋ ̋ ̋ test × × ̋ × ※΋͏1ͭʮsystemʯͱ͍͏scope͕͋Γ·͕͢ɺ͋·Γଟ༻͠ͳ͍ͷͰࠓճ͸આ໌͠·ͤΜ

(C) CASAREAL, Inc. All rights reserved. #ccc_f1 TDPQFͷܾΊํ ▸ 8FCΞϓϦέʔγϣϯͷ৔߹
▸ QSPWJEFEˠ"1αʔόʔʹؚ·Ε͍ͯΔ΋ͷʢαʔϒ Ϩοτ"1*ͳͲʣ ▸ DPNQJMFˠ"1αʔόʔʹؚ·Ε͍ͯͳ͍΋ͷ ▸ UFTUˠςετ࣌ʹͷΈඞཁͳ΋ͷ ▸ SVOUJNFˠ΄΅࢖Θͳ͍ 40

(C) CASAREAL, Inc. All rights reserved. #ccc_f1 ຊষͷ·ͱΊ ▸ QPNYNMʹEFQFOEFODZΛॻ͘ʂ
▸ EFQFOEFODZ͸.BWFO$FOUSBM3FQPTJUPSZͰ ݕࡧͯ͠ίϐʔʂ ▸ ϑΥϧμߏ଄͕ܾ·͍ͬͯΔʂ ▸ छྨͷείʔϓΛద੾ʹࢦఆ͠Α͏ʂ 41

(C) CASAREAL, Inc. All rights reserved. #ccc_f1 ৽ਓݚमఆ൪ͷ࠷ऴ՝୊ ▸ αʔϒϨοτɾ+41ɾ+%#$Ͱɺ 
"NB[POͷΑ͏ͳγϣοϐϯάαΠτΛ։ൃ ᶃϩάΠϯɾϩάΞ΢τ ᶄ঎඼ͷݕࡧ ᶅങ͍෺Χΰ΁ͷ௥Ճ ᶆ஫จొ࿥ 43

(C) CASAREAL, Inc. All rights reserved. #ccc_f1 .7$Ϟσϧ ▸ ྫɿ঎඼ͷݕࡧ
44 ݕࡧΩʔϫʔυ ೖྗը໘ ʢJSPʣ ݕࡧ݁Ռ දࣔը໘ ʢJSPʣ ঎඼ݕࡧ ίϯτϩʔϥʔ ʢαʔϒϨοτʣ ঎඼DAO ʢJavaʣ ঎඼ ΤϯςΟςΟ ʢJavaʣ View Controller Model DB

(C) CASAREAL, Inc. All rights reserved. #ccc_f1 αʔϒϨοτɾ+41ͷ໰୊఺ ▸ .ɾ7ɾ$͕ࠞࡏ͢Δ͜ͱ͕͋Δ
▸ ྫɿαʔϒϨοτ͸7JFXʹ΋ͳΕΔʢPVUQSJOUMO ʣ ▸ ྫɿ+41͸%#ΞΫηε΋Ͱ͖ΔʢεΫϦϓτϨοτʣ ▸ ೖྗνΣοΫػೳ͕ແ͍ ▸ αʔϒϨοτͷ୯ମςετ͕ࠔ೉ 45

(C) CASAREAL, Inc. All rights reserved. #ccc_f1 +%#$ͷ໰୊఺ ▸ ࣅͨΑ͏ͳίʔυΛຖճ
ॻ͔ͳ͚Ε͹ͳΒͳ͍ ▸ ίωΫγϣϯऔಘɺ  εςʔτϝϯτऔಘɺ  ύϥϝʔλࢦఆɺ  ݁Ռηοτͷऔಘɺ  ৚݅෼ذͯ͠ɺ  ֤ྻ͔Β஋औΓग़͠ɺ  ΤϯςΟςΟʹ୅ೖɺɾɾɾ 46 public Employee findById(Integer id) { Employee employee = null; // ໭Γ஋ String sql = "SELECT name, department_id," + " joined_date FROM employee WHERE id = ?"; try (Connection con = DriverManager .getConnection(URL, USER, PASSWORD); PreparedStatement ps = con.prepareStatement(sql)) { ps.setInt(1, id); ResultSet rs = ps.executeQuery(); if (rs.next()) { String name = rs.getString("name"); int departmentId = rs.getInt("department_id"); Date joinedDate = rs.getDate("joined_date"); employee = new Employee(); employee.setId(id); employee.setName(name); employee.setDepartmentId(departmentId); employee.setJoinedDate(joinedDate); } } catch (SQLException e) { // ຊདྷ͸ϩάग़ྗ΍ྫ֎ͷ࠶εϩʔΛߦ͏ e.printStackTrace(); } return employee; } ※ ※ʮϘΠϥʔϓϨʔτίʔυʯͱݺ͹ΕΔ

(C) CASAREAL, Inc. All rights reserved. #ccc_f1 ͦ͜Ͱछͷਆثʂ ᶃ8FCϑϨʔϜϫʔΫ ▸
.7$ΛΩονϦ෼͚ΔʂೖྗνΣοΫػೳͱͷ࿈ܞʂ ᶄ%*ίϯςφ ▸ ୯ମςετΛ༰қʹ͢Δʂ ᶅ03Ϛούʔ ▸ %#ΞΫηεΛ؆ܿʹॻ͚Δʂ 47

(C) CASAREAL, Inc. All rights reserved. #ccc_f1 8FCϑϨʔϜϫʔΫͱ͸ʁ ▸ ϑϨʔϜϫʔΫʹ࿮૊Έ
▸ Ϗϡʔͱͷ࿈ܞ͓ΑͼίϯτϩʔϥʔΛఏڙ͢Δ ▸ ίϯτϩʔϥʔ಺ʹϏϡʔͷग़ྗ͸ॻ͚ͳ͍ʂ 48 ೖྗը໘ ݁Ռը໘ ίϯτϩʔϥʔ DAO ΤϯςΟ ςΟ DB WebϑϨʔϜϫʔΫͷൣғ

(C) CASAREAL, Inc. All rights reserved. #ccc_f1 8FCϑϨʔϜϫʔΫͷେ·͔ͳ࢓૊Έ ▸ ϑϩϯτίϯτϩʔϥʔ
ͱݺ͹ΕΔαʔϒϨοτ ͕શͯͷϦΫΤετΛड ͚औΓɺ֤ίϯτϩʔϥʔ ʹॲཧΛৼΓ෼͚Δ 49 ϑϩϯτ ίϯτϩʔϥʔ ʢαʔϒϨοτʣ ίϯτ ϩʔϥʔ ίϯτ ϩʔϥʔ ίϯτ ϩʔϥʔ ϦΫΤετ ※ϑϨʔϜϫʔΫ ಺ͷΫϥε ϦϑϨΫγϣϯΛ ࢖͍ͬͯΔʢޙड़ʣ

(C) CASAREAL, Inc. All rights reserved. #ccc_f1 छྨͷ8FCϑϨʔϜϫʔΫ ᶃΞΫγϣϯϕʔε  ϑϨʔϜϫʔΫ
▸ αʔϒϨοτɾ+41ͱ ΄΅ಉ͡ײ֮Ͱϓϩά ϥϜΛ࡞੒͢Δ ▸ +BWBͰ͸ଟ਺೿ ▸ 4QSJOH.7$ɺ4USVUT ͕୅දྫ 50 ೖྗը໘ ݁Ռը໘ ίϯτϩʔϥʔ

(C) CASAREAL, Inc. All rights reserved. #ccc_f1 छྨͷ8FCϑϨʔϜϫʔΫ ᶄίϯϙʔωϯτϕʔε  ϑϨʔϜϫʔΫ
▸ /&5΍"OESPJEͳͲ(6* ΞϓϦͱಉ͡ײ֮Ͱϓ ϩάϥϜΛ࡞੒͢Δ ▸ +BWBͰ͸গ਺೿ ▸ +4'͕୅දྫ 51 ೖྗը໘ ೖྗ߲໨1 ೖྗ߲໨2 ೖྗ߲໨3 όοΩϯά Ϗʔϯ String input1; String input2; String input3;

(C) CASAREAL, Inc. All rights reserved. #ccc_f1 ೖྗνΣοΫػೳ ▸ ΄΅શͯͷϑϨʔϜϫʔ
ΫͰɺೖྗνΣοΫػ ೳ͕ఏڙ͞Ε͍ͯΔ ▸ ӈͷίʔυ͸  #FBO7BMJEBUJPOͷྫ ▸ 4QSJOH.7$Ͱ΋+4' Ͱ΋࢖͑Δ 52 public class InputForm { @NotNull @Size(min = 1, max = 10) private String input1; @NotNull @Max(99) private Integer number; // setter/getterলུ }

(C) CASAREAL, Inc. All rights reserved. #ccc_f1 Ϗϡʔ͸ʁ ▸ 4QSJOH.7$΍4USVUTͰ͸+41͕σϑΥϧτ 
ˠϏϡʔʹϩδοΫ͕ࠞࡏͰ͖Δ໰୊  ˠ࠷ۙͰ͸୅ΘΓʹ5IZNFMFBG͕Α͘࢖ΘΕΔ ▸ +4'Ͱ͸طʹ+41͕ඇਪ঑  ˠ'BDFMFUTͱ͍͏ผͷϏϡʔٕज़Λ࢖͍ͬͯΔ 53

(C) CASAREAL, Inc. All rights reserved. #ccc_f1 /PNPSF+41 ▸ ࠷ۙͰ͸ɺ+41͸ੵۃతʹ࠾༻͞Εͳ͍܏޲
▸ ϏϡʔͱϩδοΫ͕ࠞࡏͰ͖ͯ͠·͏ ▸ σϑΥϧτͰ͸ΤεέʔϓॲཧΛ͠ͳ͍ͨΊɺ  ΫϩεαΠτεΫϦϓςΟϯά੬ऑੑ͕ى͖΍͍͢ ▸ ग़ྗ͢Δ෦෼͸શͯDPVUͰॻ͔ͳ͍ͱ੬ऑੑʹͳΔ ▸ ৄࡉ͸ʮΫϩεαΠτεΫϦϓςΟϯάʯͰάάͬͯͩ͘ ͍͞ 54

(C) CASAREAL, Inc. All rights reserved. #ccc_f1 03Ϛούʔͱ͸ʁ ▸ %#ΞΫηεΛ؆୯ʹॻ͚ΔϥΠϒϥϦ
▸ +%#$Ͱ਺ेߦͷϓϩάϥϜ͕ɺ΋ͷͷ਺ߦʹʂ ▸ େ͖͘෼͚ͯλΠϓɻϝϦοτɾσϝϦοτΛߟ͑ͯ࠾༻͠·͠ΐ͏ʂ 55 ೖྗը໘ ݁Ռը໘ ίϯτϩʔϥʔ DAO ΤϯςΟ ςΟ DB ORϚούʔͷൣғ

(C) CASAREAL, Inc. All rights reserved. #ccc_f1 λΠϓᶃڱٛͷ03Ϛούʔ ▸ ࠷΋ϓϩάϥϜ͕୹͘ॻ͚Δ
▸ 42-͢Βॻ͔ͳ͍ ▸ ͨͩ͠ɺͦͷ෼͚ͩ։ൃऀ͔Β ݟ͑ͳ͍෦෼΋ଟ͘ɺϋϚΓͲ ͜Ζ͸ଟ͍ ▸ Ұൠతʹɺਖ਼نԽ͞Ε͍ͯͳ͍ %#ʹ͸޲͔ͳ͍ͱ͞Ε͍ͯΔ ▸ ୅දྫɿ+1"ɺ)JCFSOBUF 56 // JPAͷྫ EntityManager em = …; Employee employee = em.find(Employee.class, 101); ϦϑϨΫγϣϯΛ ࢖͍ͬͯΔʢޙड़ʣ

(C) CASAREAL, Inc. All rights reserved. #ccc_f1 λΠϓᶄ42-Ϛούʔ ▸ 42-ΛςΩετϑΝΠϧ΍
9.-ʹॻ͘ ▸ ෳࡶͳ+0*/ɺ෭໰͍߹Θ ͤɺΠϯσοΫεͷ׆༻΋ Մೳ ▸ ࡞੒͢΂͖ϑΝΠϧ͸ɺڱٛ ͷ03ϚούʔΑΓଟ͘ͳΔ ▸ ୅දྫɿ.Z#BUJTɺ%PNB 57 EmployeeDao dao = …; Employee employee = dao.findById(101); // Domaͷྫ @Dao public interface EmployeeDao { Employee findById(int id); } SELECT id, name, joined_date, department_id FROM employee WHERE id = /*id*/999

(C) CASAREAL, Inc. All rights reserved. #ccc_f1 λΠϓᶅλΠϓηʔϑܕ ▸ Ϋϥε΍ϝιουΛར༻
ͯ͠42-Λ૊ΈཱͯΔ ▸ จࣈྻΛॻ͔ͳ͍ͨΊɺه ड़ϛεʹΑΔ࣮ߦ࣌ྫ֎͕ গͳ͘ͳΔ ▸ هड़ྔ͸͔ͳΓ૿͑Δ ▸ ୅දྫɿ2VFSZ%4-ɺ K002ɺ%#'MVUF 58 // QueryDSLͷྫ QCustomer c = new QCustomer("c"); SQLTemplates dialect = …; SQLQuery<?> query = …; List<String> lastNames = query .select(c.lastName) .from(c) .where(c.firstName.eq("Bob")) .fetch(); https://github.com/querydsl/querydsl/tree/master/querydsl-sql ͔ΒҾ༻

(C) CASAREAL, Inc. All rights reserved. #ccc_f1 %*ίϯςφͱ͸ʁ ▸ ίϯτϩʔϥʔͱ%"0ʢ·ͨ͸Ϗδωεϩδο
Ϋʣͷ઀ଓΛ୲౰͢Δ 59 ೖྗը໘ ݁Ռը໘ ίϯτϩʔϥʔ DAO ΤϯςΟ ςΟ DB DIίϯςφͷൣғ

(C) CASAREAL, Inc. All rights reserved. #ccc_f1 %*ͱ͸ʁ 60 //
DAOΠϯλϑΣʔε public interface EmployeeDao { Employee findById(int id); } // DAOΠϯλϑΣʔεͷ࣮૷Ϋϥε public class EmployeeDaoImpl implements EmployeeDao { @Override public Employee findById(int id) { // ORϚούʔͰDBΞΫηε͢Δ } }

DIΛ࢖͍ͬͯͳ͍ίϯτϩʔϥʔΫϥε public class EmployeeController { public String findById(int id) { EmployeeDao dao = new EmployeeDaoImpl(); Employee employee = dao.findById(id); // ը໘ʹϑΥϫʔυ } }

DIΛ࢖͍ͬͯΔίϯτϩʔϥʔΫϥε public class EmployeeController { @Inject EmployeeDao dao; public String findById(int id) { Employee employee = dao.findById(id); // ը໘ʹϑΥϫʔυ } } EmployeeDaoImplͷ Πϯελϯε͕ ࣗಈతʹ୅ೖ͞ΕΔ ϦϑϨΫγϣϯΛ ࢖͍ͬͯΔʢޙड़ʣ

(C) CASAREAL, Inc. All rights reserved. #ccc_f1 %*ͷԿ͕خ͍͔͠ʁ ▸ ୯ମςετ͕΍Γ΍͘͢ͳΔʂ
▸ ίϯτϩʔϥʔΫϥεͷ୯ମςετ࣌ʹɺ  &NQMPZFF%BPͷԾͷΫϥεʢʹελϒɺϞοΫʣʹ ࠩ͠ସ͑͠΍͘͢ͳΔ ▸ %*Λ࢖͍ͬͯͳ͍৔߹ɺඞͣ&NQMPZFF%BP*NQMΫϥ ε͕ඞཁʹͳΔͨΊɺࠩ͠ସ͑͸ࠔ೉ 63

(C) CASAREAL, Inc. All rights reserved. #ccc_f1 ԾͷΫϥεΛར༻ͨ͠୯ମςετ 64 //
DAOΠϯλϑΣʔεͷελϒʢςετ༻ͷԾΫϥεʣ public class StubEmployeeDao implements EmployeeDao { @Override public Employee findById(int id) { // ୯७ͳݻఆ஋Λฦ͢ͷΈ Employee emp = new Employee(); emp.setId(id); emp.setName("ࢁాଠ࿠"); emp.setDepartmentId(10); emp.setJoinedDate(LocalDate.of(2016, 12, 3)); return emp; } }

(C) CASAREAL, Inc. All rights reserved. #ccc_f1 ελϒΛར༻ͨ͠ίϯτϩʔϥʔͷ୯ମςετ 65 //
JUnitͰͷྫ public class EmployeeControllerTest { @Test public void test_findById() { EmployeeController controller = new EmployeeController(); // DAOϑΟʔϧυʹελϒΛ୅ೖ controller.dao = new StubEmployeeDao(); // ίϯτϩʔϥʔϝιουͷςετ String viewName = controller.findById(101); assertThat(viewName, is("index")); } }

(C) CASAREAL, Inc. All rights reserved. #ccc_f1 ຊ൪؀ڥͰ͸ʁ ▸ &NQMPZFF%BP*NQMͷΠϯελϯε͕ࣗಈతʹ୅
ೖ͞ΕΔ ▸ %FQFOEFODZ*OKFDUJPOʢґଘੑͷ஫ೖʣ  ʹΠϯελϯεͷ୅ೖ 66

(C) CASAREAL, Inc. All rights reserved. #ccc_f1 %*ίϯςφͷ΋ͬͱৄ͍͜͠ͱ͸ ▸ ͜ͷ෦԰ͷ࣍ͷηογϣϯ 
ʮ4QSJOH͸Ͳ͏΍ͬͯ%*͍ͯ͠Δͷ͔ʯ  ΁Ͳ͏ͧʂ 67

(C) CASAREAL, Inc. All rights reserved. #ccc_f1 ΞϓϦέʔγϣϯαʔόʔ͕΍͍ͬͯΔ͜ͱ ▸ ΞϓϦέʔγϣϯαʔόʔͷىಈࣗମ͕ 
NBJO ϝιουͷ࣮ߦͱߟ͑Ε͹ྑ͍ ▸ ΞϓϦέʔγϣϯαʔόʔ͸ɺ ᶃXFCYNMΛಡΈࠐΜͰαʔϒϨοτΫϥε໊Λऔಘ͢Δ ᶄΫϥε໊͔ΒαʔϒϨοτͷΠϯελϯεΛੜ੒͢Δ ᶅΠϯελϯεͷEP(FU EP1PTU Λ࣮ߦ͢Δ 71

(C) CASAREAL, Inc. All rights reserved. #ccc_f1 ΞϓϦέʔγϣϯαʔόʔ͕΍͍ͬͯΔ͜ͱ 72 †startup.bat
≒mainϝιουىಈ <servlet> <servlet-name>HelloServlet</servlet-name> <servlet-class>com.example.HelloServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>HelloServlet</servlet-name> <url-pattern>/hello</url-pattern> </servlet-mapping> ᶃweb.xmlಡΈࠐΈ ᶃ’ Ϋϥε໊औಘ αʔϒϨοτ Πϯελϯε ᶄੜ੒ ᶅdoGet/doPost ※࣮ࡍʹ͸ɺΫϥΠΞϯτ͔ΒͦͷαʔϒϨοτ΁ͷॳճϦΫΤετ͕͋ͬͨ࣌ʹɺαʔϒϨοτΠϯελϯε͕ੜ੒͞Ε·͢

(C) CASAREAL, Inc. All rights reserved. #ccc_f1 ϦϑϨΫγϣϯͷαϯϓϧίʔυ 74 //
HelloServletΫϥεΛද͢ClassΠϯελϯεͷऔಘ Class klass = Class.forName("com.example.HelloServlet"); // HelloServletΫϥεͷҾ਺ͳ͠ίϯετϥΫλͷऔಘ Constructor constructor = klass.getConstructor(); // औಘͨ͠ίϯετϥΫλΛར༻ͯ͠ΠϯελϯεΛੜ੒ Object servlet = constructor.newInstance();

(C) CASAREAL, Inc. All rights reserved. #ccc_f1 ϦϑϨΫγϣϯͷαϯϓϧίʔυ 75 //
HelloServletΫϥεͷdoGet()ϝιουΛऔಘ Method method = klass.getMethod("doGet", String.class); // doGet()ϝιουͷ࣮ߦ Object returnValue = method.invoke(servlet, "hoge"); // doGet()ϝιουͷ໭Γ஋Λදࣔ System.out.println(returnValue);

(C) CASAREAL, Inc. All rights reserved. #ccc_f1 +1"ΤϯςΟςΟͷྫ 78 @Entity
// ΤϯςΟςΟΫϥεͰ͋Δ͜ͱΛࣔ͢ @Table(name = "employee") // ରԠ͢Δςʔϒϧ໊ public class EmployeeEntity { @Id // ओΩʔͰ͋Δ͜ͱΛࣔ͢ private Integer id; @Column(name = "emp_name") // ྻ໊͕"emp_name" private String name; // getter/setter͸লུ

(C) CASAREAL, Inc. All rights reserved. #ccc_f1 Ϋϥεʹ෇͍͍ͯΔΞϊςʔγϣϯͷऔಘ 79 Class<Employee>
klass = (Class<Employee>) Class.forName("com.example.Employee"); // EntityΞϊςʔγϣϯͷऔಘ Entity entity = klass.getAnnotation(Entity.class); if (entity != null) { System.out.println("͜ͷΫϥε͸ΤϯςΟςΟͰ͢"); } // TableΞϊςʔγϣϯͷऔಘ Table table = klass.getAnnotation(Table.class); System.out.println("ςʔϒϧ໊͸" + table.name());

(C) CASAREAL, Inc. All rights reserved. #ccc_f1 ϑΟʔϧυʹ෇͍͍ͯΔΞϊςʔγϣϯͷऔಘ 80 Field[]
fields = klass.getDeclaredFields(); for (Field field : fields) { String fieldName = field.getName(); Column column = field.getAnnotation(Column.class); String columnName = column.name(); System.out.println(fieldName + "ͷྻ໊͸" + columnName); Id id = field.getAnnotation(Id.class); if (id != null) { System.out.println(fieldName + "͸ओΩʔͰ͢"); } }

(C) CASAREAL, Inc. All rights reserved. #ccc_f1 ͳͥϩΪϯάϥΠϒϥϦΛ࢖͏ͷʁ 4ZTUFNPVUQSJOUMO ͡Όμϝʁ
ᶃϩάͷϨϕϧΛઃఆͰ͖Δ ▸ ։ൃ؀ڥͰ͸શϩάΛग़ྗɺຊ൪؀ڥͰ͸*/'0ϨϕϧҎ ্ͷΈग़ྗɺͱ͔ ᶄ౷Ұͨ͠ϑΥʔϚοτΛࢦఆͰ͖Δ ▸ ʮ<೥݄೔࣌෼ඵϛϦඵ><Ϋϥε໊>ϝοηʔδʯͱ͔ ᶅϑΝΠϧ΁ͷग़ྗ΍ɺผαʔόʔ΁ͷసૹͳͲ͕Ͱ ͖Δ 85

(C) CASAREAL, Inc. All rights reserved. #ccc_f1 MPHCBDLYNM ▸ ϩάϨϕϧ΍ϑΥʔϚοτΛࢦఆ͢Δ
88 <configuration> <appender name="FILE" class="ch.qos.logback.core.FileAppender"> <file>logback-sample/testFile.log</file> <append>true</append> <encoder> <pattern> %d{yyyy-MM-dd HH:mm:ss.SSS} %-5level %logger{36} - %msg%n </pattern> </encoder> </appender> <root level="info"> <appender-ref ref="FILE" /> </root> </configuration>

(C) CASAREAL, Inc. All rights reserved. #ccc_f1 ϩΨʔͷऔಘͱϩάͷग़ྗ 89 import
org.slf4j.Logger; import org.slf4j.LoggerFactory; public class SampleService { private static final Logger LOGGER = LoggerFactory.getLogger(SampleService.class); public void doSomething() { LOGGER.trace("This is trace log."); LOGGER.debug("This is debug log."); LOGGER.info("This is info log."); LOGGER.warn("This is warn log."); LOGGER.error("This is debug log."); } } logback.xmlʹࢦఆͨ͠ ϨϕϧҎ্ͷΈ ग़ྗ͞ΕΔ Ϋϥεͷ׬શम০໊͕ ϩΨʔͷ໊લͱͳΔ

(C) CASAREAL, Inc. All rights reserved. #ccc_f1 ग़ྗ͞ΕͨϩάϑΝΠϧ 90 2016-12-02
15:03:17.868 INFO com.example.service.SampleService - This is info log. 2016-12-02 15:03:17.868 WARN com.example.service.SampleService - This is warn log. 2016-12-02 15:03:17.868 ERROR com.example.service.SampleService - This is debug log. ▸ MPHCBDLYNMʹࢦఆͨ͠ ▸ ϨϕϧҎ্ͷΈग़ྗ͞ΕΔ ▸ ϝοηʔδͷϑΥʔϚοτͰग़ྗ͞ΕΔ

[完全版] 新人研修や本では教えてくれないJava！

[完全版] 新人研修や本では教えてくれないJava！

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