本文实例为大家分享了JavaSwing实现小型学生管理系统的具体代码，供大家参考，具体内容如下
在项目中建立四个包，分别是com.wu.JavaBean、com.wuJavaDao、com.wu.JavaService、com.wu.JavaView
数据库表结构
学生表只有四个属性：学生姓名、学生性别、学生学号(主键)、学生班级
管理员表只有两个属性：管理员用户名(主键)、管理员密码
这里笔者为了简单，学生表只写了四个属性，管理员表只写了两个属性。
在JavaBean新建Student和Root类，如下：
Student.java:
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package com.wu.JavaBean;/** * * @date 2020年12月15日下午9:49:51* @author 一夜星尘 */public class Student { private String name; private String gender; private String id; private String team; public Student() {} public Student(String name,String gender,String id,String team) { this.name = name; this.id = id; this.team = team; this.gender = gender; } public String getName() { return name; } public void setName(String name) { this.name = name; } public String getGender() { return gender; } public void setGender(String gender) { this.gender = gender; } public String getId() { return id; } public void setId(String id) { this.id = id; } public String getTeam() { return team; } public void setTeam(String team) { this.team = team; }} |
Root.java:
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package com.wu.JavaBean;/** * * @date 2020年12月15日下午9:50:30* @author 一夜星尘 */public class Root { private String username; // 账号 private String password; // 密码 private String superroot ; // 超级管理员身份 唯一一个 public Root(String username) { this.username = username; } public Root(String username,String password,String superroot) { this.username = username; this.password = password; this.superroot = superroot; } public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } public boolean isSuperRoot() { return superroot.equals("1"); // 1代表超级管理员 }} |
建立数据库连接DAO层，即在JavaDao包下建立JDBC.java，该程序只是控制数据库的连接：
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package com.wu.JavaDao;import java.sql.Connection;import java.sql.DriverManager;import java.sql.SQLException;/*** @date 2020年12月15日下午9:58:11* @author 一夜星尘*/public class JDBC { private Connection sqllink = null; /** * 获取数据库连接对象 * @return * @throws Exception */ public Connection getConnection() throws Exception{ String DATABASE_DRIVER = "com.mysql.cj.jdbc.Driver"; String DATABASE_URL = "jdbc:mysql://127.0.0.1:3306/jdbc_db"+ "?charcterEncoding=utf-8&useSSL=false&serverTimezone=UTC&allowPublicKeyRetrieval=true"; String DATABASE_USER = "root"; String DATABASE_PASSWORD = "root"; try { Class.forName(DATABASE_DRIVER); // 注册驱动 sqllink = DriverManager.getConnection(DATABASE_URL,DATABASE_USER,DATABASE_PASSWORD); // 连接数据库 return this.sqllink; }catch(SQLException e) { e.printStackTrace(); System.out.println("连接数据库异常"); // 错误信息显示到控制台 return this.sqllink; } } /** * 关闭数据库连接对象 * @throws Exception */ public void closeConnection() throws Exception{ try { if(this.sqllink != null) { this.sqllink.close(); } }catch(SQLException e) { System.out.println("关闭数据库连接异常"); } }} |
com.wu.JavaBean和com.wu.JavaDao已经全部完成了，接下来就是完成业务逻辑JavaService包下的实现
对于增添数据的业务方法Add.java:
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package com.wu.JavaService;import java.sql.Connection;import java.sql.PreparedStatement;import java.sql.SQLException;import com.wu.JavaBean.Root;import com.wu.JavaBean.Student;import com.wu.JavaDao.JDBC;/*** @date 2020年12月15日下午9:59:09* @author 一夜星尘*/public class Add { /** * 添加信息 * @param element 学生或者管理员 * @return * @throws Exception */ public static boolean add(Object element) throws Exception{ // 多态 // 获取数据库对象 JDBC jdbc = new JDBC(); Connection sqllink = jdbc.getConnection(); PreparedStatement sqlaction = null; // 创建一个数据库操作对象 if(element instanceof Student) { String sql = "insert into student(name,gender,id,team) values(?,?,?,?)"; // mysql插入语句 Student student = (Student) element; // 向下转型 try { sqlaction = sqllink.prepareStatement(sql); // 操作对象 sqlaction.setString(1,student.getName()); sqlaction.setString(2,student.getGender()); sqlaction.setString(3,student.getId()); sqlaction.setString(4,student.getTeam()); int count = sqlaction.executeUpdate(); // 执行操作 return (count == 1) ? true : false; }catch(SQLException e) { return false; }finally{ jdbc.closeConnection(); // 关闭数据库连接 if(sqlaction != null) { sqlaction.close(); } } }else if(element instanceof Root) { String sql = "insert into root(username,password,superroot) values(?,?,0)"; // mysql插入语句 Root root = (Root) element; // 向下转型 // 超级管理员权限 if(!root.isSuperRoot()) { return false; } try { sqlaction = sqllink.prepareStatement(sql); // 操作对象 sqlaction.setString(1,root.getUsername()); sqlaction.setString(2,root.getPassword()); int count = sqlaction.executeUpdate(); // 执行操作 return (count == 1) ? true : false; }catch(SQLException e) { return false; }finally{ jdbc.closeConnection(); // 关闭数据库连接 if(sqlaction != null) { sqlaction.close(); } } }else { System.out.println("对象传入错误"); return false; } }} |
对于删除Remove.java:
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package com.wu.JavaService;import java.sql.Connection;import java.sql.PreparedStatement;import java.sql.SQLException;import com.wu.JavaBean.Root;import com.wu.JavaBean.Student;import com.wu.JavaDao.JDBC;/*** @date 2020年12月15日下午10:00:30* @author 一夜星尘*/public class Remove { /** * 移除学生信息 * @param student 待移除的学生 * @param pos 移除方式 * @return * @throws Exception */ public static boolean removeStudent(Student student ,String username,int pos) throws Exception{ // 部分修改或者全部修改 // 权限判断 只有超级管理员才能实现全部学生删除 if (pos == 0 && !Find.getAccess(username).equals("1")) { return false; } // 获取数据库对象 JDBC jdbc = new JDBC(); Connection sqllink = jdbc.getConnection(); PreparedStatement sqlaction = null; // 创建一个数据库操作对象 String sql = ""; String[] info = new String[4]; /** * 0代表删除所有学生 * 1代表删除所有姓名为name的学生 * 2代表删除所有性别为gender的学生 * 3代表删除一个学号为id的学生 * 4代表删除所有班级为team的学生 * 5代表删除所有姓名为name性别为gender的学生 * 6代表删除一个学号为id姓名为name的学生 * 7代表删除所有姓名为name的班级为team的学生 * 8代表删除性别为gender学号为id的一个学生 * 9代表删除所有性别为gender班级为team的学生 * 10代表删除一个学号为id班级为team的学生 * 11代表删除一个姓名为name性别为gender学号为id的学生 * 12代表删除所有姓名为name性别为gender班级为team的学生 * 13代表删除删除一个姓名为name学号为id班级为team的学生 * 14代表删除一个性别为gender学号为id班级为team的学生 * 15代表删除一个姓名为name性别为gender学号为id班级为team的学生 */ switch(pos) { case 0: sql = "delete from student"; try { sqlaction = sqllink.prepareStatement(sql); sqlaction.executeUpdate(); return true; }catch(SQLException e) { e.printStackTrace(); return false; }finally { jdbc.closeConnection(); if(sqlaction != null) { sqlaction.close(); } } case 1: sql = "delete from student where name = ?"; info[0] = student.getName(); break; case 2: sql = "delete from student where gender = ?"; info[0] = student.getGender(); break; case 3: sql = "delete from student where id = ?"; info[0] = student.getId(); break; case 4: sql = "delete from student where team = ?"; info[0] = student.getTeam(); break; case 5: sql = "delete from student where name = ? and gender = ?"; info[0] = student.getName(); info[1] = student.getGender(); break; case 6: sql = "delete from student where name = ? and id = ?"; info[0] = student.getName(); info[1] = student.getId(); break; case 7: sql = "delete from student where name = ? and team = ?"; info[0] = student.getName(); info[1] = student.getTeam(); break; case 8: sql = "delete from student where gender = ? and id = ?"; info[0] = student.getGender(); info[1] = student.getId(); break; case 9: sql = "delete from student where gender = ? and team = ?"; info[0] = student.getId(); info[1] = student.getTeam(); break; case 10: sql = "delete from student where id = ? and team = ?"; info[0] = student.getName(); info[1] = student.getGender(); break; case 11: sql = "delete from student where name = ? and gender = ? and id = ?"; info[0] = student.getName(); info[1] = student.getGender(); info[2] = student.getId(); break; case 12: sql = "delete from student where name = ? and gender = ? and team = ?"; info[0] = student.getName(); info[1] = student.getGender(); info[2] = student.getTeam(); break; case 13: sql = "delete from student where name = ? and id = ? and team = ?"; info[0] = student.getName(); info[1] = student.getId(); info[2] = student.getTeam(); break; case 14: sql = "delete from student where gender = ? and id = ? and team = ?"; info[0] = student.getGender(); info[1] = student.getId(); info[2] = student.getTeam(); break; case 15: sql = "delete from student where name = ? and gender = ? and id = ? and team = ?"; info[0] = student.getName(); info[1] = student.getGender(); info[2] = student.getId(); info[3] = student.getTeam(); } try { sqlaction = sqllink.prepareStatement(sql); switch(pos) { case 1: case 2: case 3: case 4: sqlaction.setString(1, info[0]); break; case 5: case 6: case 7: case 8: case 9: case 10: sqlaction.setString(1, info[0]); sqlaction.setString(2, info[1]); break; case 11: case 12: case 13: case 14: sqlaction.setString(1, info[0]); sqlaction.setString(2, info[1]); sqlaction.setString(3, info[2]); break; case 15: sqlaction.setString(1, info[0]); sqlaction.setString(2, info[1]); sqlaction.setString(3, info[2]); sqlaction.setString(4, info[3]); break; } sqlaction.executeUpdate(); return true; }catch(SQLException e) { e.printStackTrace(); return false; }finally { jdbc.closeConnection(); if(sqlaction != null) { sqlaction.close(); } } } /** * 删除管理员信息 * @param root 待删除管理员 * @return * @throws Exception */ public static boolean removeRoot(Root root) throws Exception{ // 完全删除 // 权限判断 if(!root.isSuperRoot()) { return false; } // 获取数据库对象 JDBC jdbc = new JDBC(); Connection sqllink = jdbc.getConnection(); PreparedStatement sqlaction = null; // 创建一个数据库操作对象 String sql = "delete from root where username = ? "; try { sqlaction = sqllink.prepareStatement(sql); sqlaction.setString(1,root.getUsername()); int count = sqlaction.executeUpdate(); return count == 1?true : false; }catch(SQLException e) { e.printStackTrace(); return false; }finally { jdbc.closeConnection(); if(sqlaction != null) { sqlaction.close(); } } }} |
对于查找Find.java:
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package com.wu.JavaService;import java.sql.Connection;import java.sql.PreparedStatement;import java.sql.ResultSet;import java.sql.SQLException;import java.util.ArrayList;import com.wu.JavaBean.Root;import com.wu.JavaBean.Student;import com.wu.JavaDao.JDBC;/*** @date 2020年12月15日下午10:01:05* @author 一夜星尘*/public class Find { /** * 查找学生信息 * @param student 待查找的学生 * @param pos 查找方式 * @return * @throws Exception */ public static ArrayList<Student> findStduent(Student student,int pos) throws Exception{ // 查询所有学生或者部分学生 // 获取数据库对象 JDBC jdbc = new JDBC(); Connection sqllink = jdbc.getConnection(); PreparedStatement sqlaction = null; // 创建一个数据库操作对象 ResultSet result = null; // 结果集 String sql = ""; ArrayList<Student> studentlist = new ArrayList<Student>(); // 返回的结果 /** * 0 代表查询全部 * 1 代表查询所有姓名为name的学生 * 2 代表查询所有性别为gender的学生 * 3 代表查询一个学号为id的学生 * 4 代表查询所有班级为team的学生 * 5 代表查询...同删除操作 */ switch(pos) { case 0: sql = "select * from student"; try { sqlaction = sqllink.prepareStatement(sql); result = sqlaction.executeQuery(); // 执行查询操作 while(result.next()) { String name = result.getString("name"); String gender = result.getString("gender"); String id = result.getString("id"); String team = result.getString("team"); studentlist.add(new Student(name,gender,id,team)); // 添加至返回结果中 } return studentlist; }catch(SQLException e) { e.printStackTrace(); return null; }finally { jdbc.closeConnection(); if(sqlaction != null) { sqlaction.close(); } } case 1: sql = "select * from student where name like ?"; sqlaction = sqllink.prepareStatement(sql); sqlaction.setString(1,student.getName()); break; case 2: sql = "select * from student where gender like ?"; sqlaction = sqllink.prepareStatement(sql); sqlaction.setString(1,student.getGender()); break; case 3: sql = "select * from student where id like ?"; sqlaction = sqllink.prepareStatement(sql); sqlaction.setString(1,student.getId()); break; case 4: sql = "select * from student where team like ?"; sqlaction = sqllink.prepareStatement(sql); sqlaction.setString(1,student.getTeam()); break; case 5: sql = "select * from student where name like ? and gender like ?"; sqlaction = sqllink.prepareStatement(sql); sqlaction.setString(1,student.getName()); sqlaction.setString(2,student.getGender()); break; case 6: sql = "select * from student where name like ? and id like ?"; sqlaction = sqllink.prepareStatement(sql); sqlaction.setString(1,student.getName()); sqlaction.setString(2,student.getId()); break; case 7: sql = "select * from student where name like ? and team like ?"; sqlaction = sqllink.prepareStatement(sql); sqlaction.setString(1,student.getName()); sqlaction.setString(2,student.getTeam()); break; case 8: sql = "select * from student where gender like ? and id like ?"; sqlaction = sqllink.prepareStatement(sql); sqlaction.setString(1,student.getGender()); sqlaction.setString(2,student.getId()); break; case 9: sql = "select * from student where gender like ? and team like ?"; sqlaction = sqllink.prepareStatement(sql); sqlaction.setString(1,student.getGender()); sqlaction.setString(2,student.getTeam()); break; case 10: sql = "select * from student where id like ? and team like ?"; sqlaction = sqllink.prepareStatement(sql); sqlaction.setString(1,student.getId()); sqlaction.setString(2,student.getTeam()); break; case 11: sql = "select * from student where name like ? and gender like ? and id like ?"; sqlaction = sqllink.prepareStatement(sql); sqlaction.setString(1,student.getName()); sqlaction.setString(2,student.getGender()); sqlaction.setString(3,student.getId()); break; case 12: sql = "select * from student where name like ? and gender like ? and team like ?"; sqlaction = sqllink.prepareStatement(sql); sqlaction.setString(1,student.getName()); sqlaction.setString(2,student.getGender()); sqlaction.setString(3,student.getTeam()); break; case 13: sql = "select * from student where name like ? and id like ? and team like ?"; sqlaction = sqllink.prepareStatement(sql); sqlaction.setString(1,student.getName()); sqlaction.setString(2,student.getId()); sqlaction.setString(3,student.getTeam()); break; case 14: sql = "select * from student where gender like ? and id like ? and team like ?"; sqlaction = sqllink.prepareStatement(sql); sqlaction.setString(1,student.getGender()); sqlaction.setString(2,student.getId()); sqlaction.setString(3,student.getTeam()); break; case 15: sql = "select * from student where name like ? and gender like ? and id like ? and team like ?"; sqlaction = sqllink.prepareStatement(sql); sqlaction.setString(1,student.getName()); sqlaction.setString(2,student.getGender()); sqlaction.setString(3,student.getId()); sqlaction.setString(4,student.getTeam()); break; } try { result = sqlaction.executeQuery(); // 执行查询操作 while(result.next()) { String name = result.getString("name"); String gender = result.getString("gender"); String id = result.getString("id"); String team = result.getString("team"); studentlist.add(new Student(name,gender,id,team)); // 添加至返回结果中 } return studentlist; }catch(SQLException e) { e.printStackTrace(); return null; }finally { jdbc.closeConnection(); if(sqlaction != null) { sqlaction.close(); } } } /** * 超级管理员权限 * 查找所有管理员 * @param root 验证属性 * @return * @throws Exception */ public static ArrayList<Root> findRoot(Root root) throws Exception{ // 完全查找权限 // 获取数据库对象 JDBC jdbc = new JDBC(); Connection sqllink = jdbc.getConnection(); PreparedStatement sqlaction = null; // 创建一个数据库操作对象 ResultSet result = null; ArrayList<Root> rootlist = new ArrayList<Root>(); String sql = "select * from root"; try { sqlaction = sqllink.prepareStatement(sql); result = sqlaction.executeQuery(); while(result.next()) { String username = result.getString("username"); String password = result.getString("password"); String superroot = result.getString("superroot"); rootlist.add(new Root(username,password,superroot)); } return rootlist; }catch(SQLException e) { e.printStackTrace(); return null; }finally { jdbc.closeConnection(); if(sqlaction != null) { sqlaction.close(); } } } /** * 获取权限信息 * @param username 用户名 * @return * @throws Exception */ public static String getAccess(String username) throws Exception{ // 获取数据库对象 JDBC jdbc = new JDBC(); Connection sqllink = jdbc.getConnection(); PreparedStatement sqlaction = null; // 创建一个数据库操作对象 ResultSet result = null; String sql = "select superroot from root where username = ?"; try { sqlaction = sqllink.prepareStatement(sql); sqlaction.setString(1, username); result= sqlaction.executeQuery(); if(result.next()) { return result.getString("superroot"); }else { return "0"; } }catch(SQLException e) { e.printStackTrace(); return "0"; }finally { jdbc.closeConnection(); if(sqlaction != null) { sqlaction.close(); } } } public static int getCount() throws Exception{ // 获取数据库对象 JDBC jdbc = new JDBC(); Connection sqllink = jdbc.getConnection(); PreparedStatement sqlaction = null; // 创建一个数据库操作对象 ResultSet result = null; String sql = "select count(*) from student"; try { sqlaction = sqllink.prepareStatement(sql); result = sqlaction.executeQuery(); if(result.next()) { return Integer.parseInt(result.getString(1)); }else { return 0; } }catch(Exception e) { e.printStackTrace(); return 0; } } } |
对于修改Update.java:
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package com.wu.JavaService;import java.sql.Connection;import java.sql.PreparedStatement;import java.sql.SQLException;import com.wu.JavaBean.Root;import com.wu.JavaBean.Student;import com.wu.JavaDao.JDBC;/*** @date 2020年12月15日下午10:01:22* @author 一夜星尘*/public class Update { /** * 更新学生信息 * @param oldstudent 待修改的学生 * @param newstudent 修改后的学生 * @param pos 修改方式 * @return * @throws Exception */ public static boolean updateStudent(Student oldstudent,Student newstudent,int pos) throws Exception{ // 部分或者完全更新模式 // 获取数据库对象 JDBC jdbc = new JDBC(); Connection sqllink = jdbc.getConnection(); PreparedStatement sqlaction = null; // 创建一个数据库操作对象 String sql = ""; int count = 0; switch(pos) { case 0: sql = "update student set name = ?,gender = ?,id = ?,team = ? where id = ?"; // id一定要存在 try { sqlaction = sqllink.prepareStatement(sql); sqlaction.setString(1,newstudent.getName()); sqlaction.setString(2,newstudent.getGender()); sqlaction.setString(3,newstudent.getId()); sqlaction.setString(4,newstudent.getTeam()); sqlaction.setString(5,oldstudent.getId()); count = sqlaction.executeUpdate(); //执行操作 return count==1?true:false; }catch(SQLException e) { e.printStackTrace(); return false; }finally { jdbc.closeConnection(); if(sqlaction != null) { sqlaction.close(); } } case 1: sql = "update student set name = ? where name = ?"; sqlaction = sqllink.prepareStatement(sql); sqlaction.setString(1,newstudent.getName()); sqlaction.setString(2, oldstudent.getName()); break; case 2: sql = "update student set name = ? where gender = ?"; sqlaction = sqllink.prepareStatement(sql); sqlaction.setString(1,newstudent.getName()); sqlaction.setString(2, oldstudent.getGender()); break; case 3: sql = "update student set name = ? where id = ?"; sqlaction = sqllink.prepareStatement(sql); sqlaction.setString(1,newstudent.getName()); sqlaction.setString(2, oldstudent.getId()); break; case 4: sql = "update student set name = ? where team = ?"; sqlaction = sqllink.prepareStatement(sql); sqlaction.setString(1,newstudent.getName()); sqlaction.setString(2, oldstudent.getTeam()); break; case 5: sql = "update student set gender = ? where name = ?"; sqlaction = sqllink.prepareStatement(sql); sqlaction.setString(1,newstudent.getGender()); sqlaction.setString(2, oldstudent.getName()); break; case 6: sql = "update student set gender = ? where gender = ?"; sqlaction = sqllink.prepareStatement(sql); sqlaction.setString(1,newstudent.getGender()); sqlaction.setString(2, oldstudent.getGender()); break; case 7: sql = "update student set gender = ? where id = ?"; sqlaction = sqllink.prepareStatement(sql); sqlaction.setString(1,newstudent.getGender()); sqlaction.setString(2, oldstudent.getId()); break; case 8: sql = "update student set gender = ? where team = ?"; sqlaction = sqllink.prepareStatement(sql); sqlaction.setString(1,newstudent.getGender()); sqlaction.setString(2, oldstudent.getTeam()); break; case 9: sql = "update student set id = ? where id = ?"; sqlaction = sqllink.prepareStatement(sql); sqlaction.setString(1,newstudent.getId()); sqlaction.setString(2, oldstudent.getId()); break; case 10: sql = "update student set team = ? where name = ?"; sqlaction = sqllink.prepareStatement(sql); sqlaction.setString(1,newstudent.getTeam()); sqlaction.setString(2, oldstudent.getName()); break; case 11: sql = "update student set team = ? where gender = ?"; sqlaction = sqllink.prepareStatement(sql); sqlaction.setString(1,newstudent.getTeam()); sqlaction.setString(2, oldstudent.getGender()); break; case 12: sql = "update student set team = ? where id = ?"; sqlaction = sqllink.prepareStatement(sql); sqlaction.setString(1,newstudent.getTeam()); sqlaction.setString(2, oldstudent.getId()); break; case 13: sql = "update student set team = ? where team = ?"; sqlaction = sqllink.prepareStatement(sql); sqlaction.setString(1,newstudent.getTeam()); sqlaction.setString(2, oldstudent.getTeam()); break; } try { count = sqlaction.executeUpdate(); return count >= 1 ? true:false; }catch(SQLException e) { e.printStackTrace(); return false; }finally { jdbc.closeConnection(); if(sqlaction != null) { sqlaction.close(); } } } /** * 超级管理员权限 * @param root 待更新的管理员 * @param info 更新信息 * @param pos 更新方式 * @return * @throws Exception */ public static boolean updateRoot(Root root ,String info,int pos) throws Exception{ // 完全更新模式 // 获取数据库对象 JDBC jdbc = new JDBC(); Connection sqllink = jdbc.getConnection(); PreparedStatement sqlaction = null; // 创建一个数据库操作对象 String sql = ""; switch(pos){ case 1: sql = "update root set username = ? where username =?"; break; case 2: sql = "update root set password = ? where username =?"; break; } try { sqlaction = sqllink.prepareStatement(sql); sqlaction.setString(1,info); sqlaction.setString(2, root.getUsername()); int count = sqlaction.executeUpdate(); return count == 1?true:false; }catch(SQLException e) { e.printStackTrace(); return false; }finally { jdbc.closeConnection(); if(sqlaction != null) { sqlaction.close(); } } }} |
加上管理员登录认证Exist.java:
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package com.wu.JavaService;import java.sql.Connection;import java.sql.PreparedStatement;import java.sql.ResultSet;import java.sql.SQLException;import com.wu.JavaBean.Root;import com.wu.JavaDao.JDBC;/*** @date 2020年12月15日下午10:41:32* @author 一夜星尘*/public class Exist { /** * 管理员登录认证 * @param root 管理员 * @return * @throws Exception */ public static boolean rootIsExist(Root root) throws Exception { // 获取数据库对象 JDBC jdbc = new JDBC(); Connection sqllink = jdbc.getConnection(); PreparedStatement sqlaction = null; // 创建一个数据库操作对象 ResultSet result = null; String sql = "select count(*) from root where username = ? and password = ?"; try { sqlaction = sqllink.prepareStatement(sql); sqlaction.setString(1,root.getUsername()); sqlaction.setString(2,root.getPassword()); result = sqlaction.executeQuery(); if(result.next()) { int count = Integer.parseInt(result.getString(1)); return count == 1 ? true:false; }else { return false; } }catch(SQLException e) { e.printStackTrace(); return false; }finally { jdbc.closeConnection(); // 关闭数据库连接 if(sqlaction != null) { sqlaction.close(); } } }} |
处理模糊查询的DealString.java:
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package com.wu.JavaService;import java.util.HashMap;import java.util.Iterator;import java.util.Map;import java.util.regex.Matcher;import java.util.regex.Pattern;/*** @date 2020年12月15日下午1:48:05* @author 一夜星尘*/public class DealString { public static String[] deal(String search) { String[] searchs = search.split("&"); String regex = "([\\u4e00-\\u9fa5]+)=([ % _ a-z 0-9 \\u4e00-\\u9fa5]+)"; // 匹配中文或者数字模式 String[] result = new String[5]; result[0] = "0"; // 默认为全部 boolean nameflag = false; boolean genderflag = false; boolean idflag = false; boolean teamflag = false; HashMap<Integer, String> hashmap = new HashMap<Integer, String>(); for(String str : searchs) { Matcher mattcher = Pattern.compile(regex).matcher(str); if(mattcher.find()) { if(mattcher.group(1).equals("姓名")) { nameflag = true; hashmap.put(1,mattcher.group(2)); }else if(mattcher.group(1).equals("性别")){ genderflag = true; hashmap.put(2,mattcher.group(2)); }else if(mattcher.group(1).equals("学号")) { idflag = true; hashmap.put(3,mattcher.group(2)); }else if(mattcher.group(1).equals("班级")) { teamflag = true; hashmap.put(4,mattcher.group(2)); }else { } } } // 对应位置放置相关信息 Iterator<?> iter = hashmap.entrySet().iterator(); while (iter.hasNext()) { Map.Entry entry = (Map.Entry) iter.next(); int key = (int) entry.getKey(); String val =(String) entry.getValue(); result[key] = val; } if(nameflag && !genderflag && !idflag && !teamflag) { result[0] = "1"; return result; }else if(!nameflag && genderflag && !idflag && !teamflag) { result[0] = "2"; return result; }else if(!nameflag && !genderflag && idflag && !teamflag) { result[0] = "3"; return result; }else if(!nameflag && !genderflag && !idflag && teamflag) { result[0] = "4"; return result; }else if(nameflag && genderflag && !idflag && !teamflag) { result[0] = "5"; return result; }else if(nameflag && !genderflag && idflag && !teamflag) { result[0] = "6"; return result; }else if(nameflag && !genderflag && !idflag && teamflag) { result[0] = "7"; return result; }else if(!nameflag && genderflag && idflag && !teamflag) { result[0] = "8"; return result; }else if(!nameflag && genderflag && !idflag && teamflag) { result[0] = "9"; return result; }else if(!nameflag && !genderflag && idflag && teamflag) { result[0] = "10"; return result; }else if(nameflag && genderflag && idflag && !teamflag) { result[0] = "11"; return result; }else if(nameflag && genderflag && !idflag && teamflag) { result[0] = "12"; return result; }else if(nameflag && !genderflag && idflag && teamflag) { result[0] = "13"; return result; }else if(!nameflag && genderflag && idflag && teamflag) { result[0] = "14"; return result; }else if(nameflag && genderflag && idflag && teamflag) { result[0] = "15"; return result; } return result; }} |
接下来就是可视化界面，在JavaView包下
Home.java:
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package com.wu.JavaView;/*** @date 2020年12月16日下午5:09:16* @author 一夜星尘*/public class Hemo { public static void main(String[] args) { try { new Login(); }catch(Exception e) { System.out.println("程序出错!"); } }} |
登录界面Login.java：
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package com.wu.JavaView;import java.awt.Color;import java.awt.Font;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import javax.swing.BorderFactory;import javax.swing.ImageIcon;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JLayeredPane;import javax.swing.JOptionPane;import javax.swing.JPanel;import javax.swing.JPasswordField;import javax.swing.JRootPane;import javax.swing.JTextField;import javax.swing.border.Border;import com.wu.JavaBean.Root;import com.wu.JavaService.Exist;/*** @date 2020年12月16日下午10:02:08* @author 一夜星尘*/public class Login extends JFrame{ private static final long serialVersionUID = 1L; public Login() throws Exception{ this.setSize(450,350); // 设置宽高度 this.setTitle("登录界面"); // 设置标题 this.setResizable(false); // 固定窗口大小 this.setUndecorated(true); // 去掉窗口的装饰 this.getRootPane().setWindowDecorationStyle(JRootPane.PLAIN_DIALOG); //采用指定的窗口装饰风格 this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // 结束程序 this.setLocationRelativeTo(null); // 使之位于主窗口的中心 setBackGroundPanel(); this.setVisible(true); // 显示 } public void setBackGroundPanel() throws Exception{ JPanel panel = new JPanel(); JButton jb=new JButton("测试按钮"); jb.setBounds(100,100,100,100); this.add(panel); panel.setLayout(null); // 空布局 Font font = new Font("微软雅黑",Font.BOLD,11); Border border1 = BorderFactory.createLoweredBevelBorder(); Border border2 = BorderFactory.createLineBorder(Color.BLUE); JLabel usernamelabel = new JLabel("账号: "); usernamelabel.setFont(font); usernamelabel.setForeground(Color.BLACK); usernamelabel.setBounds(130,100,30,15); JLabel passwordlabel = new JLabel("密码: "); passwordlabel.setFont(font); passwordlabel.setForeground(Color.BLACK); passwordlabel.setBounds(130,150,30,15); JTextField usernametext = new JTextField("I am superroot"); usernametext.setBounds(160,95,150,20); usernametext.setBorder(border1);// usernametext.setOpaque(false); // 透明框 JPasswordField passwordtext = new JPasswordField("password"); passwordtext.setBounds(160,145,150,20); passwordtext.setBorder(border1); JButton submit = new JButton("登录"); JButton close = new JButton("退出"); submit.setBorder(border2); // 登录键边框风格 submit.setBounds(130,210,90,25); submit.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent arg0) { String username = usernametext.getText(); String password = new String(passwordtext.getPassword()); if(username.equals("")) { JOptionPane.showMessageDialog(null, "用户名不能为空!", "错误",JOptionPane.WARNING_MESSAGE); }else if(password.equals("")){ JOptionPane.showMessageDialog(null, "密码不能为空!", "错误",JOptionPane.WARNING_MESSAGE); }else { // 登录认证 Root root = new Root(username,password,"0"); // 新建一个虚拟管理员对象 try { if(Exist.rootIsExist(root)) { new Menu(username); dispose(); // 关闭当前的窗口 }else { JOptionPane.showMessageDialog(null, "用户名或密码错误!", "错误",JOptionPane.WARNING_MESSAGE); } }catch(Exception e) { e.printStackTrace(); }finally { usernametext.setText(""); passwordtext.setText(""); } } } }); close.setBorder(border2); // 关闭键边框风格 close.setBounds(250,210,90,25); close.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent arg0) { int quit = JOptionPane.showConfirmDialog(null,"是否退出?","提示",JOptionPane.YES_NO_OPTION); if(quit == JOptionPane.YES_OPTION) { System.exit(0); } } }); panel.add(submit); panel.add(close); panel.add(usernametext); panel.add(passwordtext); panel.add(usernamelabel); panel.add(passwordlabel); } } |
效果如下，布局简单：
主页面Menu.java：
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package com.wu.JavaView;import java.awt.Color;import java.awt.Font;import java.awt.Panel;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JMenu;import javax.swing.JMenuBar;import javax.swing.JMenuItem;import javax.swing.JPanel;import javax.swing.JRootPane;/*** @date 2020年12月16日上午10:53:39* @author 一夜星尘*/public class Menu{ private static JFrame Frame = new JFrame(); private String username = null; private static JPanel Panel = null; public Menu(String username) { this.username = username; Frame.setSize(800,600); // 设置宽高度 Frame.setTitle("菜单界面"); // 设置标题 Frame.setResizable(false); // 固定窗口大小 Frame.setUndecorated(true); // 去掉窗口的装饰 Frame.getRootPane().setWindowDecorationStyle(JRootPane.FRAME); //采用指定的窗口装饰风格 Frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE); Frame.setLocationRelativeTo(null); // 主窗口的中心 Panel = this.getPanel(); this.setMenu(); // 设置菜单项 Frame.add(Panel); Frame.setVisible(true); // 可见 } public JPanel getPanel() { JPanel panel = new JPanel(); panel.setLayout(null);// 绝对布局 panel.setBackground(Color.LIGHT_GRAY); Font font = new Font("微软雅黑",Font.BOLD,20); JLabel id="codetool">
笔者这里由于增删改查界面设计繁琐，亦限于篇幅，只展示‘查’的这一部分FindPanel.java：
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