Java 企业级项目入门:从零开始的实战指南_1
姒傝堪锛?/p>
鏈枃鏃ㄥ湪寮曞浣犲叆闂↗ava浼佷笟绾ч」鐩紝浠庨浂寮€濮嬪叏闈㈣鐩朖ava鍩虹鐭ヨ瘑銆侀潰鍚戝璞$紪绋嬨€乄eb寮€鍙戙€佷紒涓氱骇妗嗘灦浣跨敤锛岀洿鑷冲疄璺甸」鐩紝璁╀綘鍏ㄩ潰鎺屾彙鏋勫缓浼佷笟绾у簲鐢ㄦ墍闇€鎶€鑳姐€?/p>
Java锛屽嚟鍊熷叾绋冲畾銆侀珮鏁堝拰骞挎硾鐨勭敓鎬佺郴缁燂紝宸叉垚涓烘瀯寤轰紒涓氱骇搴旂敤鐨勯閫夎瑷€涔嬩竴銆備紒涓氱骇椤圭洰閫氬父闇€瑕佸鐞嗗ぇ瑙勬ā鐨勬暟鎹€佸鏉傜殑涓氬姟閫昏緫銆侀珮搴︾殑瀹夊叏鎬у拰鍙潬鎬э紝杩欎簺鐗规€ф鏄疛ava寮洪」鎵€鍦ㄣ€傝鎴戜滑寮€濮嬭繖娈垫梾绋嬶紝閫愭鎺屾彙Java鐨勬牳蹇冩妧鑳姐€?/p>
涓€銆丣ava鍩虹鍏ラ棬
1. Java绠€浠嬪強鍏跺紑鍙戠幆澧冩惌寤?/p>
Java鏄竴绉嶉潰鍚戝璞$殑銆佽法骞冲彴鐨勭紪绋嬭瑷€锛岀敱Sun Microsystems寮€鍙戙€傚叾寮哄ぇ鐨勭被搴撱€佷赴瀵岀殑寮€鍙戝伐鍏峰拰骞挎硾鐨勭ぞ鍖烘敮鎸侊紝浣垮叾鎴愪负浼佷笟绾у簲鐢ㄥ紑鍙戠殑棣栭€夎瑷€銆備綘闇€瑕佸畨瑁呬竴涓泦鎴愬紑鍙戠幆澧冿紙IDE锛夛紝濡侷ntelliJ IDEA鎴朎clipse锛屼互鍙奐ava杩愯鐜锛圝RE锛夊拰寮€鍙戝伐鍏峰寘锛圝DK锛夈€?/p>
2. Java鍩烘湰璇硶鍜屾暟鎹被鍨?/p>
Java鐨勫熀鏈娉曠畝娲佹槑浜嗭紝鏄撲簬蹇€熶笂鎵嬨€傛暟鎹被鍨嬪垎涓哄熀鏈被鍨嬶紙濡俰nt銆乨ouble銆乥oolean锛夊拰寮曠敤绫诲瀷锛堝String銆佺被锛夈€備互涓嬫槸涓€涓畝鍗曠殑绀轰緥浠g爜锛?/p>
```java
public class Main {
public static void main(String[] args) {
int age = 25;
String name = "John Doe";
boolean isStudent = true;
System.out.println("Name: " + name);
System.out.println("Age: " + age);
System.out.println("Student: " + isStudent);
}
}
```
3. 鎺у埗娴佺▼
Java鏀寔鏉′欢璇彞锛坕f-else锛夈€佸惊鐜紙for銆亀hile銆乨o-while锛変互鍙婂嚱鏁扮瓑鍩烘湰鎺у埗娴佺▼缁撴瀯銆傞€氳繃鎺屾彙杩欎簺鍩虹缁撴瀯锛屼綘灏嗚兘澶熸瀯寤烘洿涓哄鏉傜殑绋嬪簭閫昏緫銆?/p>
浜屻€侀潰鍚戝璞$紪绋?/h3>
鍦↗ava涓紝涓€鍒囬兘鏄璞°€備綘灏嗗涔犲浣曞垱寤虹被銆佸畾涔夊璞″睘鎬т互鍙婂疄鐜版柟娉曘€傝繕灏嗘繁鍏ヤ簡瑙e皝瑁呫€佺户鎵垮拰澶氭€佺瓑闈㈠悜瀵硅薄缂栫▼鐨勬牳蹇冩蹇点€?/p>
涓夈€乄eb寮€鍙?/h3>
鍦╓eb寮€鍙戦儴鍒嗭紝浣犲皢瀛︿範Java Web搴旂敤寮€鍙戠殑鍩虹鐭ヨ瘑锛屽寘鎷琒ervlet銆丣SP鍜孧VC鏋舵瀯銆備綘灏嗕簡瑙e浣曚娇鐢ㄨ繖浜涙妧鏈瀯寤哄姩鎬佺殑Web搴旂敤绋嬪簭銆?/p>
鍥涖€佷紒涓氱骇妗嗘灦浣跨敤
鏈儴鍒嗗皢甯︿綘鎺㈢储Java浼佷笟绾ф鏋讹紝濡係pring銆丮yBatis鍜孒ibernate銆備綘灏嗗涔犺繖浜涙鏋剁殑鍩烘湰鐢ㄦ硶锛屼互鍙婂浣曞皢瀹冧滑搴旂敤浜庡疄闄呴」鐩腑銆傝繕灏嗕粙缁岼Unit鍗曞厓娴嬭瘯鐨勫疄璺碉紝浠ョ‘淇濅唬鐮佺殑璐ㄩ噺鍜屽彲闈犳€с€?/p>
浜斻€佸疄鎴橀」鐩?/h3>
閫氳繃瀹炴垬椤圭洰锛屽鍦ㄧ嚎涔﹀簵绠$悊绯荤粺绛夛紝浣犲皢瀛︿範鏁呴殰鎺掓煡涓庢€ц兘浼樺寲绛栫暐銆傝繕灏嗕簡瑙i」鐩儴缃蹭笌杩愮淮鍩虹锛屽府鍔╀綘鎼缓楂樺彲鐢ㄣ€侀珮鎬ц兘鐨勪紒涓氱骇搴旂敤銆?/p>
閫氳繃鏈枃鐨勫涔狅紝浣犲皢浠庨浂寮€濮嬮€愭鎺屾彙Java鐨勫熀纭€鐭ヨ瘑銆侀潰鍚戝璞$紪绋嬨€乄eb寮€鍙戙€佷紒涓氱骇妗嗘灦浣跨敤浠ュ強瀹炴垬椤圭洰銆侸ava鐨勭敓鎬佺郴缁熶赴瀵屼笖寮哄ぇ锛屾帉鎻¤繖浜涙妧鑳藉皢鏈夊姪浜庝綘鍦ㄨ蒋浠跺紑鍙戦鍩熷彇寰楁垚鍔熴€傞潰鍚戝璞$紪绋嬪垵鎺?/p>
涓€銆佺被涓庡璞$殑姒傚康
鍦ㄩ潰鍚戝璞$紪绋嬬殑涓栫晫閲岋紝鎴戜滑鍙互灏嗗叿鏈夊叡鍚屽睘鎬у拰琛屼负鐨勫疄浣撴娊璞′负绫汇€傝繖浜涘疄浣撳彲浠ユ槸鐢熸椿涓殑鍏蜂綋浜嬬墿锛屽浜恒€佸姩鐗╃瓑銆傝€屽璞″垯鏄繖浜涚被鐨勫疄渚嬪寲锛屽嵆鍏蜂綋鐨勫疄渚嬨€備緥濡傦紝鎴戜滑鍙互鍒涘缓涓€涓狿erson绫绘潵鎻忚堪浜虹殑鍩烘湰鐗瑰緛鍜岃涓恒€傝繖涓被鍖呭惈灞炴€у拰鏂规硶锛屽垎鍒唬琛ㄤ汉鐨勭壒寰佸拰鍔ㄤ綔銆傛瘡涓壒瀹氱殑涓綋濡傚紶涓夋垨鏉庡洓锛岄兘鍙互鐪嬩綔鏄疨erson绫荤殑瀵硅薄銆備互涓嬫槸Person绫荤殑鍩烘湰缁撴瀯锛?/p>
```java
public class Person {
private String name; // 浜虹殑鍚嶅瓧灞炴€?/p>
private int age; // 浜虹殑骞撮緞灞炴€?/p>
public Person(String name, int age) { // 鏋勯€犲嚱鏁帮紝鐢ㄤ簬鍒涘缓瀵硅薄鏃跺垵濮嬪寲灞炴€?/p>
this.name = name;
this.age = age;
}
public void introduce() { // 鏂规硶锛屾弿杩颁汉鐨勮嚜鎴戜粙缁嶈涓?/p>
System.out.println("My name is " + this.name + " and I am " + this.age + " years old.");
}
}
```
浜屻€佸皝瑁呫€佺户鎵垮拰澶氭€佺殑搴旂敤
瀛︾敓涓庢暀甯堢被浠嬬粛
鍦ㄧ紪绋嬩笘鐣屼腑锛屾垜浠ā鎷熺湡瀹炰笘鐣屼腑鐨勪釜浣擄紝濡傚鐢熷拰鏁欏笀銆傝鎴戜滑鐪嬬湅浠栦滑鐨凧ava绫诲畾涔夛細
瀛︾敓绫伙紙Student锛夌户鎵胯嚜Person绫伙紝鎷ユ湁鐙壒鐨凣PA锛堟垚缁╃偣鏁帮級灞炴€с€傛瘡褰撳垱寤轰竴涓柊鐨勫鐢熷璞℃椂锛屾垜浠渶瑕佷负鍏舵寚瀹氬鍚嶃€佸勾榫勫拰GPA銆備緥濡傦紝涓€涓悕涓哄紶涓夈€佸勾榫勪负20銆丟PA涓?.5鐨勫鐢熷彲浠ヨ繖鏍峰垱寤猴細
```java
public class Student extends Person {
private double gpa;
public Student(String name, int age, double gpa) {
super(name, age);
this.gpa = gpa;
}
public void introduce() {
System.out.println("澶у濂斤紝鎴戞槸" + this.name + "锛屼粖骞? + this.age + "宀侊紝鎴戠殑GPA鏄? + this.gpa + "銆?);
}
}
```
鍚屾牱锛屾暀甯堢被锛圱eacher锛変篃缁ф壙鑷狿erson绫伙紝骞舵嫢鏈変竴涓暀鎺堢鐩睘鎬с€傚垱寤烘暀甯堝璞℃椂锛屾垜浠渶瑕佹寚瀹氬叾濮撳悕銆佸勾榫勫拰鏁欐巿鐨勭鐩€備緥濡傦紝涓€涓悕涓烘潕鍥涖€佸勾榫勪负35銆佹暀鎺堟暟瀛︾殑鏁欏笀鍙互杩欐牱鍒涘缓锛?/p>
```java
public class Teacher extends Person {
private String subject;
public Teacher(String name, int age, String subject) {
super(name, age);
this.subject = subject;
}
public void introduce() {
System.out.println("澶у濂斤紝鎴戞槸" + this.name + "锛屼粖骞? + this.age + "宀侊紝鎴戞暀鎺堢殑璇剧▼鏄? + this.subject + "銆?);
}
}
```
Java Web搴旂敤寮€鍙戝垵鎺?/p>
璁╂垜浠笍涓奐ava Web寮€鍙戠殑鏃呯▼锛佷簡瑙eb鐨勫熀纭€锛欻TTP鍗忚涓嶶RL銆侶TTP锛堣秴鏂囨湰浼犺緭鍗忚锛夋槸娴忚鍣ㄥ拰鏈嶅姟鍣ㄤ箣闂翠氦娴佷俊鎭殑鏍囧噯璇█銆傝€孶RL锛堢粺涓€璧勬簮瀹氫綅绗︼級鍒欏鍚屼簰鑱旂綉涓婄殑鍦板潃锛岀敤浜庢壘鍒扮壒瀹氱殑璧勬簮銆備竴涓畝鍗曠殑URL渚嬪瓙鏄?[ Web寮€鍙戜腑鐨勫簲鐢ㄣ€傝鎴戜滑绠€鍗曚簡瑙e畠浠殑鍩烘湰鐢ㄦ硶鍜岀壒鎬с€係ervlet鏄疛ava Web搴旂敤鐨勬牳蹇冪粍浠朵箣涓€锛岀敤浜庡鐞嗘潵鑷祻瑙堝櫒鐨凥TTP璇锋眰骞剁敓鎴愬搷搴斻€傝€孞SP锛圝ava Server Pages锛夊垯鏄熀浜嶴ervlet鐨勫紑鍙戞ā鍨嬶紝浣垮緱鍔ㄦ€佺綉椤电殑寮€鍙戝彉寰楁洿鍔犵畝鍗曞拰鐩磋銆備互涓嬫槸涓€涓畝鍗曠殑Servlet绀轰緥鍜孞SP椤甸潰鐨勫睍绀猴細JSP椤甸潰鐨勫睍绀轰笌绠€鍗曠殑Servlet浠g爜鐩哥粨鍚堛€傛垜浠彲浠ユ竻妤氬湴鐪嬪埌瀹冧滑鏄浣曞叡鍚屽伐浣滅殑锛氫竴涓猄ervlet鍙兘鐢ㄤ簬澶勭悊鍚庡彴閫昏緫锛堜緥濡傚搷搴擧TTP璇锋眰锛夛紝鑰孞SP椤甸潰鍒欑敤浜庢樉绀虹敤鎴风晫闈㈢殑鍐呭銆傜幇鍦ㄦ垜浠户缁墠琛屾帰绱VC鏋舵瀯鍙婂叾鍦↗ava Web寮€鍙戜腑鐨勫簲鐢ㄣ€侻VC鏋舵瀯鍙婂叾鍦↗ava Web寮€鍙戜腑鐨勫簲鐢∕VC鏋舵瀯鏄竴绉嶈璁℃ā寮忥紝瀹冨皢搴旂敤绋嬪簭鐨勬暟鎹ā鍨嬶紙Model锛夈€佺敤鎴风晫闈紙View锛夊拰鎺у埗閫昏緫锛圕ontroller锛夊垎寮€澶勭悊锛屼娇寰椾唬鐮佹洿鍔犳竻鏅般€佹槗浜庣淮鎶ゅ拰鎵╁睍銆傚湪Java Web寮€鍙戜腑锛孧VC鏋舵瀯鏄疄鐜颁紒涓氱骇搴旂敤绋嬪簭鐨勯噸瑕佸熀鐭充箣涓€銆傚畠甯姪寮€鍙戣€呮瀯寤虹伒娲讳笖鏄撲簬鎵╁睍鐨勫簲鐢ㄧ▼搴忥紝渚夸簬涓庡叾浠栫郴缁熻繘琛岄泦鎴愬拰鏁版嵁浜や簰銆侻VC鏋舵瀯鐨勫疄鐜板彲浠ラ€氳繃澶氱鏂瑰紡鏉ュ畬鎴愬湪Java Web寮€鍙戜腑鍏蜂綋琛ㄧ幇涓烘帶鍒跺櫒璐熻矗鎺ユ敹鏉ヨ嚜瀹㈡埛绔殑璇锋眰骞跺皢鍏惰浆鍙戠粰鐩稿簲鐨勬ā鍨嬪鐞嗭紱妯″瀷澶勭悊瀹屾瘯鍚庡皢鏁版嵁杩斿洖缁欐帶鍒跺櫒锛涙帶鍒跺櫒鍐嶅皢鏁版嵁浼犻€掔粰瑙嗗浘杩涜灞曠ず缁欐渶缁堢敤鎴枫€傛€荤粨浠庡鐢熷拰鏁欏笀绫荤殑瀹氫箟寮€濮嬫垜浠殑缂栫▼涔嬫梾璁╂垜浠簡瑙e埌浜嗛潰鍚戝璞$紪绋嬬殑鍩烘湰姒傚康濡傜户鎵垮拰澶氭€佸湪鐜板疄涓栫晫涓殑瀹為檯搴旂敤锛涙帴鐫€鎴戜滑鎺㈣浜咼ava Web寮€鍙戠殑鍩虹姒傚康濡侶TTP鍗忚鍜孶RL鍦╓eb娴忚鍣ㄥ拰鏈嶅姟鍣ㄤ箣闂翠俊鎭氦鎹腑鎵€鎵紨鐨勮鑹诧紱鏈€鍚庢垜浠簡瑙d簡ServletJSP绠€浠嬩互鍙奙VC鏋舵瀯鍦↗ava Web寮€鍙戜腑鐨勫簲鐢ㄨ繖浜涙蹇垫瀯鎴愪簡Java Web寮€鍙戠殑鏍稿績鍩虹瀹冧滑浣垮緱鎴戜滑鏈夎兘鍔涙瀯寤哄嚭寮哄ぇ涓旀槗浜庣淮鎶ょ殑Web搴旂敤绋嬪簭鏃犺鏄瀯寤轰竴涓畝鍗曠殑鍔ㄦ€佺綉绔欒繕鏄竴涓鏉傜殑浼佷笟绾у簲鐢ㄨ繖浜涘熀纭€鐭ヨ瘑鍜屾妧鑳介兘鏄笉鍙垨缂虹殑锛丣ava浼佷笟绾ф鏋朵笌宸ュ叿姒傝
涓€銆丼pring妗嗘灦鍒濇帰
Spring锛屼綔涓篔ava棰嗗煙鐨勪竴棰楃拃鐠ㄦ槑鐝狅紝鏄竴涓叏鍔熻兘銆佸紑鏀炬簮鐮佺殑Java搴旂敤绋嬪簭妗嗘灦銆傚叾鏍稿績妯″潡娑电洊浜咺oC锛堟帶鍒跺弽杞紝鍗充緷璧栨敞鍏ワ級銆丄OP锛堥潰鍚戝垏闈㈢紪绋嬶級銆佹暟鎹闂拰浜嬪姟绠$悊绛夈€傚畠鍔╁姏寮€鍙戣€呮瀯寤哄ぇ鍨嬨€佸彲绠$悊鐨凧ava搴旂敤銆?/p>
IoC瀹瑰櫒绀轰緥锛?/p>
```java
// Spring IoC渚濊禆娉ㄥ叆绀轰緥
@Autowired
private UserService userService;
@GetMapping("/users")
public List
return userService.getUsers();
}
```
浜屻€丮yBatis鏁版嵁搴撴搷浣滄暣鍚堣瑙?/h3>
MyBatis鏄竴涓紭绉€鐨勬寔涔呭眰妗嗘灦锛屽畠灏哠QL璇彞涓嶫ava浠g爜瀹岀編鍒嗙锛屾彁鍗囦簡寮€鍙戞晥鐜囧拰浠g爜鐨勫彲璇绘€с€傞€氳繃鏄犲皠鏂囦欢锛屽紑鍙戣€呭彲浠ョ洿鎺ヤ功鍐欏師鐢烻QL锛屽疄鐜颁笌鏁版嵁搴撶殑浜や簰銆?/p>
MyBatis鏄犲皠鏂囦欢绀轰緥锛?/p>
```sql
SELECT FROM users WHERE id = {id}
```
涓夈€丠ibernate ORM妗嗘灦浠嬬粛涓庡簲鐢?/p>
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Hibernate閰嶇疆鍙婃搷浣滅ず渚嬶細
```java
SessionFactory sessionFactory = new Configuration()
.addAnnotatedClass(User.class)
.buildSessionFactory();
Session session = sessionFactory.openSession();
session.beginTransaction();
User user = new User("Alice", 25);
session.save(user);
session.getTransaction().commit();
session.close();
```
鍥涖€丣Unit鍗曞厓娴嬭瘯瀹炶返鎸囧崡
JUnit鏄疛ava缂栫▼璇█涓箍鍙楁杩庣殑娴嬭瘯妗嗘灦锛岀敤浜庣紪鍐欏拰杩愯娴嬭瘯銆傞€氳繃JUnit锛屽紑鍙戣€呭彲浠ヨ交鏉惧湴楠岃瘉浠g爜鐨勮川閲忓拰鍔熻兘鎬с€?/p>
```java
import org.junit.Test;
import static org.junit.Assert.assertEquals;
public class MathTest {
@Test
public void addTest() {
int a = 1;
int b = 2;
int expected = 3;
assertEquals(expected, a + b);
}
}
```
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