技術(shù)要點(diǎn)：

1.JDBC工具類(lèi)的搭建

public class JDBCutils {private static BasicDataSource datasource = new BasicDataSource();static {datasource.setDriverClassName("com.mysql.cj.jdbc.Driver");datasource.setUrl("jdbc:mysql://localhost:3306/zb?serverTimezone=UTC");datasource.setUsername("root");datasource.setPassword("123456");datasource.setInitialSize(10);datasource.setMaxIdle(8);datasource.setMinIdle(3);}public static DataSource getdatasource() {return datasource;} }

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2.數(shù)據(jù)庫(kù)增刪改查四大功能熟練使用

3.數(shù)據(jù)IO流的掌握

4.確定幾個(gè)層級(jí)之間的關(guān)系與連通關(guān)系（如下圖所示）

步驟一：環(huán)境的搭建及數(shù)據(jù)庫(kù)的建立

需要用到的幾個(gè)包（commons-dbcp，commons-dbutils，commons-pool，mysql-connector-java）

需要在mysql中建立以個(gè)數(shù)據(jù)庫(kù)，同時(shí)建立一張表格來(lái)存儲(chǔ)用戶(hù)數(shù)據(jù)，表格屬性包括賬務(wù)名、賬務(wù)類(lèi)別、金額、轉(zhuǎn)出賬戶(hù)、創(chuàng)建時(shí)間、具體描述。

步驟二：模塊的構(gòu)建

按照上述圖需要搭建4個(gè)模塊，不同模塊有不同的分工，可以使得任務(wù)完成更加順暢，大的項(xiàng)目工程更加需要這種分包合作。

步驟三：javaBean

JavaBean是指的是Java中的類(lèi)，該類(lèi)中的成員變量與數(shù)據(jù)庫(kù)表中的字段相對(duì)應(yīng)（變量名對(duì)應(yīng)數(shù)據(jù)庫(kù)表字段名、變量數(shù)據(jù)類(lèi)型對(duì)應(yīng)數(shù)據(jù)庫(kù)表字段類(lèi)型），并提供空參數(shù)構(gòu)造方法、set、get方法。

此后我們?cè)谡{(diào)用方法時(shí)的對(duì)象全部來(lái)自于這個(gè)javabean類(lèi)對(duì)象，在本系統(tǒng)中構(gòu)建的是ZhangWu對(duì)象，包含已經(jīng)創(chuàng)建好的數(shù)據(jù)庫(kù)的所有屬性(步驟一所提及)都在這個(gè)類(lèi)對(duì)象ZhangWu中。

public class ZhangWu {private int zwid;private String flname;private double money;private String ZhangHu;private String createtime;private String description;public ZhangWu(int zwid, String flname, double money, String zhangHu, String createtime, String description) {super();this.zwid = zwid;this.flname = flname;this.money = money;ZhangHu = zhangHu;this.createtime = createtime;this.description = description;}public ZhangWu() {}@Overridepublic String toString() {return "ZhangWu [zwid=" + zwid + ", flname=" + flname + ", money=" + money + ", ZhangHu=" + ZhangHu+ ", createtime=" + createtime + ", description=" + description + "]";}public int getZwid() {return zwid;}public void setZwid(int zwid) {this.zwid = zwid;}public String getFlname() {return flname;}public void setFlname(String flname) {this.flname = flname;}public double getMoney() {return money;}public void setMoney(double money) {this.money = money;}public String getZhangHu() {return ZhangHu;}public void setZhangHu(String zhangHu) {ZhangHu = zhangHu;}public String getCreatetime() {return createtime;}public void setCreatetime(String createtime) {this.createtime = createtime;}public String getDescription() {return description;}public void setDescription(String description) {this.description = description;}}

步驟四：View視圖層搭建

主要用于搭建運(yùn)行界面顯示，是與用戶(hù)進(jìn)行交互的直接平臺(tái)。主要構(gòu)建四大功能：添加賬務(wù)、編輯賬務(wù)、刪除賬務(wù)、查詢(xún)賬務(wù)，最后加上一個(gè)退出系統(tǒng)的功能。其中查詢(xún)賬務(wù)分成“查詢(xún)所有賬務(wù)”和“條件查詢(xún)”兩個(gè)功能。

最后視圖層需要與Controller控制層建立連接。

public class MainView {private static Controllerpart cont = new Controllerpart();public void run() {Scanner sc = new Scanner(System.in);while(true) {System.out.print("---------GJP賬務(wù)系統(tǒng)----------");System.out.println("1.添加賬務(wù) 2.編輯賬務(wù) 3.刪除賬務(wù) 4.查詢(xún)賬務(wù) 5.退出系統(tǒng)");System.out.println("請(qǐng)輸入需要操作的功能序號(hào)");int choose = sc.nextInt();switch(choose) {case 1:addZhangWu();break;case 2:eidtZhangWu();break;case 3:deleteZhangWu();break;case 4:selectZhangWu();break;case 5:System.exit(0);break;default:System.out.println("請(qǐng)重新輸入正確的序號(hào)");}?? ?}}private void deleteZhangWu() {// TODO Auto-generated method stubScanner sc = new Scanner(System.in);System.out.println("請(qǐng)輸入需要?jiǎng)h除的賬務(wù)ID");cont.deleteZhangWu(sc.nextInt());System.out.println("刪除成功");}private void eidtZhangWu() {// TODO Auto-generated method stubScanner sc = new Scanner(System.in);System.out.println("選擇需要修改的賬務(wù)ID");int zwid = sc.nextInt();System.out.println("輸入分類(lèi)名稱(chēng)");String flname = sc.next();System.out.println("請(qǐng)輸入金額");double money = sc.nextDouble();System.out.println("請(qǐng)輸入賬戶(hù)");String zhangHu = sc.next();System.out.println("請(qǐng)輸入時(shí)間");String createtime = sc.next();System.out.println("請(qǐng)輸入具體描述");String description = sc.next();ZhangWu zw = new ZhangWu(zwid, flname, money, zhangHu, createtime, description);cont.editZhangWu(zw);System.out.println("賬務(wù)更新成功");}private void addZhangWu() {// TODO Auto-generated method stubSystem.out.println("選擇添加的賬務(wù)，輸入如下內(nèi)容");Scanner sc = new Scanner(System.in);System.out.println("輸入分類(lèi)名稱(chēng)");String flname = sc.next();System.out.println("請(qǐng)輸入金額");double money = sc.nextDouble();System.out.println("請(qǐng)輸入賬戶(hù)");String zhangHu = sc.next();System.out.println("請(qǐng)輸入時(shí)間");String createtime = sc.next();System.out.println("請(qǐng)輸入具體描述");String description = sc.next();ZhangWu zw = new ZhangWu(0, flname, money, zhangHu, createtime, description);cont.addZhangWu(zw);System.out.println("賬務(wù)添加成功");}public void selectZhangWu() {// TODO Auto-generated method stubSystem.out.println("1.查詢(xún)所有賬務(wù) 2.條件查詢(xún)");Scanner op = new Scanner(System.in);int choose = op.nextInt();switch(choose) {case 1:selectAll();break;case 2:select();break;}}public void select() {// TODO Auto-generated method stubSystem.out.println("選擇條件查詢(xún)，輸入日期格式：xxxx-xx-xx");Scanner sc = new Scanner(System.in);System.out.println("請(qǐng)輸入查詢(xún)的起始時(shí)間");String startDate = sc.nextLine();System.out.println("請(qǐng)輸入查詢(xún)的結(jié)束時(shí)間");String endDate = sc.nextLine();List<ZhangWu> list = cont.select(startDate, endDate);if(list.size()!=0)print(list);elseSystem.out.println("沒(méi)有查詢(xún)到需要的數(shù)據(jù)");}private void selectAll() {// TODO Auto-generated method stubList<ZhangWu> list = cont.selectAll();if(list.size()!=0)print(list);elseSystem.out.println("--------沒(méi)有查詢(xún)到需要的數(shù)據(jù)---------");}public void print(List<ZhangWu> list) {System.out.println("ID\t類(lèi)別\t\t賬戶(hù)\t\t金額\t\t時(shí)間\t\t說(shuō)明");for (ZhangWu zw : list) {System.out.println(zw.getZwid() + "\t" + zw.getFlname() + "\t\t"+ zw.getZhangHu() + "\t\t" + zw.getMoney() + "\t\t"+ zw.getCreatetime() + "\t" + zw.getDescription());}} }

步驟五、六：Controller控制層搭建與Service服務(wù)層搭建

此處不做詳細(xì)處理，主要是在其中寫(xiě)入控制層與服務(wù)層以及dao數(shù)據(jù)訪(fǎng)問(wèn)層的連通函數(shù)(主要是前臺(tái)方法的重寫(xiě)調(diào)用)。

public class Controllerpart {private static Servicepart ser = new Servicepart();public void editZhangWu(ZhangWu zw) {ser.editZhangWu(zw);}public List<ZhangWu> addZhangWu(ZhangWu zw){return ser.addZhangWu(zw);}public ?List<ZhangWu> select(String startDate,String endDate){return ser.select(startDate,endDate);}public ?List<ZhangWu> selectAll() {return ser.selectAll();}public void deleteZhangWu(int zwid) {// TODO Auto-generated method stubser.deleteZhangWu(zwid);} }

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public class Servicepart {private static Daopart dao = new Daopart();public List<ZhangWu> selectAll() {// TODO Auto-generated method stubreturn dao.selectAll();}public List<ZhangWu> select(String startDate, String endDate) {// TODO Auto-generated method stubreturn dao.select(startDate,endDate);}public List<ZhangWu> addZhangWu(ZhangWu zw) {// TODO Auto-generated method stubreturn dao.addZhangWu(zw);}public void editZhangWu(ZhangWu zw) {// TODO Auto-generated method stubdao.editZhangWu(zw);}public void deleteZhangWu(int zwid) {// TODO Auto-generated method stubdao.deleteZhangWu(zwid);}

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步驟七：dao數(shù)據(jù)訪(fǎng)問(wèn)層搭建

數(shù)據(jù)訪(fǎng)問(wèn)層用于與數(shù)據(jù)庫(kù)連接，通過(guò)用戶(hù)反饋的操作來(lái)調(diào)用數(shù)據(jù)庫(kù)數(shù)據(jù)來(lái)完成操作。主要掌握數(shù)據(jù)庫(kù)語(yǔ)句的使用，以及jdbc QueryRunner類(lèi)的使用。

QueryRunner.query用于查詢(xún)數(shù)據(jù)庫(kù)；QueryRunner.update用于修改更新數(shù)據(jù)庫(kù)

public class Daopart {private QueryRunner qr = new QueryRunner(JDBCutils.getdatasource());public List<ZhangWu> selectAll() {// TODO Auto-generated method stubtry {String sql = "select * from zbzhangwu";List<ZhangWu> list = qr.query(sql,new BeanListHandler<ZhangWu>(ZhangWu.class));return list;}catch(SQLException ex) {System.out.println(ex);throw new RuntimeException("查詢(xún)失敗");}}public List<ZhangWu> select(String startDate, String endDate) {// TODO Auto-generated method stubtry {String sql = "select * from zbzhangwu where createtime between ? and ?";Object[] params = {startDate,endDate};List<ZhangWu> list = qr.query(sql, new BeanListHandler<ZhangWu>(ZhangWu.class),params);return list;}catch(SQLException ex) {System.out.println(ex);throw new RuntimeException("查詢(xún)失敗");}}public List<ZhangWu> addZhangWu(ZhangWu zw) {// TODO Auto-generated method stubtry {String sql = "insert into zbzhangwu (flname,money,zhangHu,createtime,description)values(?,?,?,?,?)";Object[] params = {zw.getFlname(),zw.getMoney(),zw.getZhangHu(),zw.getCreatetime(),zw.getDescription()};qr.update(sql, params);return null;}catch(SQLException ex) {System.out.println(ex);throw new RuntimeException("賬務(wù)添加失敗");}}public void editZhangWu(ZhangWu zw) {// TODO Auto-generated method stubtry {String sql = "update zbzhangwu set flname=?,money=?,zhangHu=?,createtime=?,description=? where zwid=?";Object[] params = {zw.getFlname(),zw.getMoney(),zw.getZhangHu(),zw.getCreatetime(),zw.getDescription(),zw.getZwid()};qr.update(sql, params);}catch(SQLException ex) {System.out.println(ex);throw new RuntimeException("數(shù)據(jù)更新失敗");}}public void deleteZhangWu(int zwid) {// TODO Auto-generated method stubtry {String sql = "delete from zbzhangwu where zwid=?";qr.update(sql,zwid);}catch(SQLException ex) {System.out.println(ex);throw new RuntimeException("刪除操作失敗");}}}

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