永久免费网站系统,网站建设文化教程,怎样用apache做网站,怎么开发wordpress子主题Java Web实现信息管理 前言#xff1a; 大二上学期刚学完Oracle#xff0c;老师就要求用Java语言操作Oracle#xff0c;当时真的是懵了。回顾自己前两年的生活#xff0c;大一上学期学习C语言#xff0c;下学期学习Java#xff0c;当时教课老师是学硬件的。课上讲一些理…Java Web实现信息管理 前言 大二上学期刚学完Oracle老师就要求用Java语言操作Oracle当时真的是懵了。回顾自己前两年的生活大一上学期学习C语言下学期学习Java当时教课老师是学硬件的。课上讲一些理论性的问题剩余时间让我们比这课本敲代码感觉自己学的Java太片面了而且那个时候也没有感到Java很重要直到现在真的后悔之前没有好好学习Java…现在想想所谓的连接Oracle和MySQL区别也不是很大JDBC连接数据库的步骤都是固定的SQL语句也差不多之间的区别就在数据库所属的公司不同驱动jar包不同具体的驱动类不同或许想到更细致一点数据库的用户名和密码不同。现在JSPservlet三层架构MVC框架前端技术 HTML CSS JS …涉及的知识范围越广理解起来其实也更加的容易。 Oracle数据库 驱动jar包从官网进行下载ojdbc-x.jar具体驱动类oracle.jdbc.OracleDriver MySQL数据库 驱动jar包mysql-connection-java-x.jar具体驱动类com.mysql.jdbc.Driver 下面是具体的项目管理 主页面显示全部学生信息index.jsp 查询操作 更新修改操作 增加操作 点击删除超链接后数据库中对应的数据成功删除这里不再展示 实现代码 StudentDao.java package org.student.dao;import java.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException; import java.util.ArrayList; import java.util.List;import org.student.entity.Student;/*** author 11441*数据访问层原子性具体的 增删改查*/ public class StudentDao {private final String URL jdbc:mysql://localhost:3306/test1;private final String USERNAME root;private final String PASSWOED root;//判断学生存在public boolean isExist(int sno) {return queryStudentBySno(sno)null ? false : true;}//增加public boolean addStudent(Student student) {//封装到数据类Connection connection null;PreparedStatement pstmt null;try {Class.forName(com.mysql.jdbc.Driver);connection DriverManager.getConnection(URL, USERNAME, PASSWOED);String sql insert into student values (?,?,?,?);pstmt connection.prepareStatement(sql);pstmt.setInt(1, student.getSno());pstmt.setString(2, student.getSname());pstmt.setInt(3, student.getSage());pstmt.setString(4, student.getSaddress());int count pstmt.executeUpdate();if(count 0) {return true;}else {return false;}} catch (ClassNotFoundException e) {e.printStackTrace();return false;} catch (SQLException e) {e.printStackTrace();return false;} catch (Exception e) {e.printStackTrace();return false;} finally {try {if(pstmt ! null) pstmt.close();if(connection ! null) connection.close();} catch (SQLException e) {e.printStackTrace();}}}//根据学号修改学生:根据sno找到要修改的人public boolean updateStudentBySno(int sno,Student student) {Connection connection null;PreparedStatement pstmt null;try {Class.forName(com.mysql.jdbc.Driver);connection DriverManager.getConnection(URL, USERNAME, PASSWOED);String sql update student set sname ?,sage?,saddress? where sno?;pstmt connection.prepareStatement(sql);pstmt.setString(1, student.getSname());pstmt.setInt(2, student.getSage());pstmt.setString(3, student.getSaddress());pstmt.setInt(4, sno);int count pstmt.executeUpdate();if(count 0) {return true;}else {return false;}} catch (ClassNotFoundException e) {e.printStackTrace();return false;} catch (SQLException e) {e.printStackTrace();return false;} catch (Exception e) {e.printStackTrace();return false;} finally {try {if(pstmt ! null) pstmt.close();if(connection ! null) connection.close();} catch (SQLException e) {e.printStackTrace();}}}//根据学号删除学生public boolean deleteStudentBySno(int sno) {//封装到数据类Connection connection null;PreparedStatement pstmt null;try {Class.forName(com.mysql.jdbc.Driver);connection DriverManager.getConnection(URL, USERNAME, PASSWOED);String sql delete from student where sno ?;pstmt connection.prepareStatement(sql);pstmt.setInt(1, sno);int count pstmt.executeUpdate();if(count 0) {return true;}else {return false;}} catch (ClassNotFoundException e) {e.printStackTrace();return false;} catch (SQLException e) {e.printStackTrace();return false;} catch (Exception e) {e.printStackTrace();return false;} finally {try {if(pstmt ! null) pstmt.close();if(connection ! null) connection.close();} catch (SQLException e) {e.printStackTrace();}}}//根据学号查询学生信息public Student queryStudentBySno(int sno) {Student student null;Connection connection null;PreparedStatement pstmt null;ResultSet rs null;try {Class.forName(com.mysql.jdbc.Driver);connection DriverManager.getConnection(URL, USERNAME, PASSWOED);String sql select * from student where sno ?;pstmt connection.prepareStatement(sql);pstmt.setInt(1, sno);rs pstmt.executeQuery();if(rs.next()) {int no rs.getInt(sno);String name rs.getString(sname);int age rs.getInt(sage);String address rs.getString(saddress);student new Student(no,name,age,address);}return student;} catch (ClassNotFoundException e) {e.printStackTrace();return null;} catch (SQLException e) {e.printStackTrace();return null;} catch (Exception e) {e.printStackTrace();return null;} finally {try {if(rs ! null) rs.close();if(pstmt ! null) pstmt.close();if(connection ! null) connection.close();} catch (SQLException e) {e.printStackTrace();}}}//查询全部学生(很多学生)public ListStudent queryAllStudent() {ListStudent students new ArrayList();Student student null;Connection connection null;PreparedStatement pstmt null;ResultSet rs null;try {Class.forName(com.mysql.jdbc.Driver);connection DriverManager.getConnection(URL, USERNAME, PASSWOED);String sql select * from student;pstmt connection.prepareStatement(sql);rs pstmt.executeQuery();while(rs.next()) {int no rs.getInt(sno);String name rs.getString(sname);int age rs.getInt(sage);String address rs.getString(saddress);student new Student(no,name,age,address);students.add(student);}return students;} catch (ClassNotFoundException e) {e.printStackTrace();return null;} catch (SQLException e) {e.printStackTrace();return null;} catch (Exception e) {e.printStackTrace();return null;} finally {try {if(rs ! null) rs.close();if(pstmt ! null) pstmt.close();if(connection ! null) connection.close();} catch (SQLException e) {e.printStackTrace();}}} } Student.java package org.student.entity;/*** author 11441*student实体类*/ public class Student {private int sno;private String sname;private int sage;private String saddress;public Student(String sname, int sage, String saddress) {this.sname sname;this.sage sage;this.saddress saddress;}public Student(int sno, String sname, int sage, String saddress) {this.sno sno;this.sname sname;this.sage sage;this.saddress saddress;}public Student() {}public Student(int sno, String sname, int sage) {this.sno sno;this.sname sname;this.sage sage;}public Student(int sage, String saddress) {this.sage sage;this.saddress saddress;}public int getSno() {return sno;}public void setSno(int sno) {this.sno sno;}public String getSname() {return sname;}public void setSname(String sname) {this.sname sname;}public int getSage() {return sage;}public void setSage(int sage) {this.sage sage;}public String getSaddress() {return saddress;}public void setSaddress(String saddress) {this.saddress saddress;}Overridepublic String toString() {return this.getSno()-this.getSname()-this.getSage()-this.getSaddress();} }StudentService.java package org.student.service;import java.util.List;import org.student.dao.StudentDao; import org.student.entity.Student;/*** author 11441*业务逻辑层逻辑性的增删改查增查增到Dao层进行的组装*/ public class StudentService {StudentDao studentDao new StudentDao();public boolean addStudent(Student student) {if(!studentDao.isExist(student.getSno())) {//学生不存在增加该学生studentDao.addStudent(student);return true;}else {System.out.println(该学生已存在);return false;}}public boolean deleteStudentBySno(int sno) {if(studentDao.isExist(sno)) {return studentDao.deleteStudentBySno(sno);}else {return false;}}public boolean updateStudentBySno(int sno,Student student) {if(studentDao.isExist(sno)) {return studentDao.updateStudentBySno(sno,student);}else {return false;}}//根据学号查询学生public Student queryStudentBySno(int sno) {return studentDao.queryStudentBySno(sno);}//查询所有学生public ListStudent queryAllStudents() {return studentDao.queryAllStudent();} }QueryAllStudentdServlet.java 关于Servlet还有AddStudentServletDeleteStudentServletQueryStudentBySnoServletUpdateStudentServlet这里就不再展示 package org.student.servlet;import java.io.IOException; import java.util.List;import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse;import org.student.entity.Student; import org.student.service.StudentService;public class QueryAllStudentdServlet extends HttpServlet {protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {request.setCharacterEncoding(utf-8);StudentService service new StudentService();ListStudent students service.queryAllStudents();System.out.println(students);request.setAttribute(students, students);//因为request域中有数据因此需要通过请求转发的方式跳转重定向会丢失request域request.getRequestDispatcher(index.jsp).forward(request, response);}protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {doGet(request, response);} }WebContent中的jsp文件 index.jsp %page importorg.student.service.StudentService% %page importorg.student.dao.StudentDao% %page importjava.util.List% %page importorg.student.entity.Student% %page importorg.student.servlet.QueryAllStudentdServlet% % page languagejava contentTypetext/html; charsetUTF-8pageEncodingUTF-8% !DOCTYPE html PUBLIC -//W3C//DTD HTML 4.01 Transitional//EN http://www.w3.org/TR/html4/loose.dtd html head meta http-equivContent-Type contenttext/html; charsetUTF-8 title学生信息列表/title style typetext/css #formstyle {margin:100px 500px; } table{width: 80%;height: 100%; } /style /head body backgroundphoto/海浪.jpg div idformstyletable border#008C8C 3px solidcaption学生信息管理系统/captiontr alignleft th学号/thth姓名/thth年龄/thth操作/th/tr!-- 学生信息有几行要通过循环 --%/* 获取request域中的数据 */ListStudent students (ListStudent)request.getAttribute(students);for(Student student : students){%trtda hrefQueryStudentBySnoServlet?sno%student.getSno() %%student.getSno()%/a/tdtd%student.getSname()%/tdtd%student.getSage()%/tdtda hrefDeleteStudentServlet?sno%student.getSno()%删除/a/td /tr%}%/tablea hrefadd.jsp新增/a /div /body /htmladd.jsp %page importorg.student.entity.Student% % page languagejava contentTypetext/html; charsetUTF-8pageEncodingUTF-8% !DOCTYPE html PUBLIC -//W3C//DTD HTML 4.01 Transitional//EN http://www.w3.org/TR/html4/loose.dtd html head meta http-equivContent-Type contenttext/html; charsetUTF-8 titleInsert title here/title /head body%Student student (Student)request.getAttribute(student);% !--通过表单展示学生 --form actionUpdateStudentServlet学号input typetext namesno value%student.getSno() % readonlyreadonly /br/姓名input typetext namesname value%student.getSname() %/br/年龄input typetext namesage value%student.getSage() %/br/地址input typetext namesaddress value%student.getSaddress() %/br/input typesubmit value 修改 /br/a hrefQueryAllStudentdServlet返回/a/form /body /htmlstudentInfo.jsp %page importorg.student.entity.Student% % page languagejava contentTypetext/html; charsetUTF-8pageEncodingUTF-8% !DOCTYPE html PUBLIC -//W3C//DTD HTML 4.01 Transitional//EN http://www.w3.org/TR/html4/loose.dtd html head meta http-equivContent-Type contenttext/html; charsetUTF-8 titleInsert title here/title /head body%Student student (Student)request.getAttribute(student);% !--通过表单展示学生 --form actionUpdateStudentServlet学号input typetext namesno value%student.getSno() % readonlyreadonly /br/姓名input typetext namesname value%student.getSname() %/br/年龄input typetext namesage value%student.getSage() %/br/地址input typetext namesaddress value%student.getSaddress() %/br/input typesubmit value 修改 /br/a hrefQueryAllStudentdServlet返回/a/form /body /html总结 web项目中信息在各个层次之间的传递的过程跳转页面重定向和请求转发的区别在JSP中怎样获取参数调用方法等各种细节需要不断的练习