Struts2+JSP+JDBC实现学生信息的增删改查

最近敲了敲struts+jsp的增删改查 欧克~话不多说 -------->
准备工作：导入所需要的jar包、struts.xml、配置web.xml
1、分包分模块
创建 dao层 service层 pojo和utils包 当然 不要忘记最重要的Action层
2、创建实体类，在这我创建的是 Student类 ，给他get/set方法，toString方法，有参构造和无参构造（可不添加）
public class Student {

private Integer id;
private String name;
private Integer age;
public Integer getId() {
	return id;
}
public void setId(Integer id) {
	this.id = id;
}
public String getName() {
	return name;
}
public void setName(String name) {
	this.name = name;
}
public Integer getAge() {
	return age;
}
public void setAge(Integer age) {
	this.age = age;
}
@Override
public String toString() {
	return "Student [id=" + id + ", name=" + name + ", age=" + age + "]";
}
public Student(Integer id, String name, Integer age) {
	super();
	this.id = id;
	this.name = name;
	this.age = age;
}
public Student() {
	super();
	// TODO Auto-generated constructor stub
}

}
3、在dao层创建一个接口以及他的实现类
public interface StudentDaoI {

List findList();

Student findById(Integer id);

void UpdateStudent(Student student);

void AddStudent(Student student);

void Delate(Integer id);

}

public class StudentDaoImpl implements StudentDaoI{

@Override
public List findList() {
	String sql="select * from student ";
	List list=new ArrayList();
	
	Connection connection = JDBCUtil.getConnection();
	PreparedStatement pst=null;
	ResultSet rs=null;
	try {
		pst = connection.prepareStatement(sql);
		rs = pst.executeQuery();
		Student stu=null;
		while(rs.next()) {
			stu=new Student(rs.getInt(1), rs.getString(2),rs.getInt(3));
			list.add(stu);
		}
	} catch (SQLException e) {
		// TODO Auto-generated catch block
		e.printStackTrace();
	}

	//关闭
	JDBCUtil.close(rs, pst, connection);
	
	return list;
}
public Student findById(Integer id) {
	// TODO Auto-generated method stub
	
	String sql="select * from student where id=?";
	
	Student student=null;
	PreparedStatement pst=null;
	ResultSet rs=null;
	Connection connection = JDBCUtil.getConnection();
	
	try {
		pst=connection.prepareStatement(sql);
		pst.setInt(1, id);
		rs=pst.executeQuery();
		
		
		if (rs.next()) {
			student=new Student(rs.getInt(1), rs.getString(2), rs.getInt(3));
			
		}
	} catch (SQLException e) {
		// TODO Auto-generated catch block
		e.printStackTrace();
	}
	
	JDBCUtil.close(rs, pst, connection);
	
	return student;
}

@Override
public void UpdateStudent(Student student) {
	// TODO Auto-generated method stub
	String sql="update student set name=?,age=? where id=?";
	Connection connection = JDBCUtil.getConnection();
	PreparedStatement pst=null;
	
	try {
		pst=connection.prepareStatement(sql);
		pst.setString(1, student.getName());
		pst.setInt(2, student.getAge());
		pst.setInt(3, student.getId());
		pst.executeUpdate();
	} catch (SQLException e) {
		// TODO Auto-generated catch block
		e.printStackTrace();
	}
	JDBCUtil.close(null, pst, connection);
	
	
	
}

@Override
public void AddStudent(Student student) {
	// TODO Auto-generated method stub
	
	String sql="insert into  student set  name=?,age=?";
	Connection connection = JDBCUtil.getConnection();
	
	PreparedStatement pst=null;
	try {
		pst=connection.prepareStatement(sql);
		pst.setString(1, student.getName());
		pst.setInt(2, student.getAge());
		pst.executeUpdate();
	} catch (SQLException e) {
		// TODO Auto-generated catch block
		e.printStackTrace();
	}
	JDBCUtil.close(null, pst, connection);
	
	
}

@Override
public void Delate(Integer id) {
	// TODO Auto-generated method stub
	
	String sql="delete from student where id=?";
	Connection connection = JDBCUtil.getConnection();
	PreparedStatement pst=null;
	
	try {
		pst=connection.prepareStatement(sql);
		pst.setInt(1,id);
		pst.executeUpdate();
	} catch (SQLException e) {
		// TODO Auto-generated catch block
		e.printStackTrace();
	}

	JDBCUtil.close(null, pst, connection);
	
}

}

4、在service层同样创建接口并实现 调用dao层的方法
public interface StudentServiceI {

List findList();

Student findById(Integer id);

void UpdateStudent(Student student);

void AddStudent(Student student);

void Delate(Integer id);

}

public class StudentServiceImpl implements StudentServiceI{

private StudentDaoI studentDao=new StudentDaoImpl();

@Override
public List findList() {
	// TODO Auto-generated method stub
	return studentDao.findList();
}
@Override
public Student findById(Integer id) {
	// TODO Auto-generated method stub
	return studentDao.findById(id);
}

@Override
public void UpdateStudent(Student student) {
	// TODO Auto-generated method stub
	studentDao.UpdateStudent(student);
}

@Override
public void AddStudent(Student student) {
	// TODO Auto-generated method stub
	studentDao.AddStudent(student);
}

@Override
public void Delate(Integer id) {
	// TODO Auto-generated method stub
	studentDao.Delate(id);
}	

}

5、接下来最重要的来喽
public class StudenrAction {

private StudentServiceI studentService=new StudentServiceImpl();
HttpServletRequest request = ServletActionContext.getRequest();
HttpServletResponse response = ServletActionContext.getResponse();

public Student student =new Student();

public String findList() {

	List list=studentService.findList();
	request.setAttribute("list", list);
	return "list";
}

public String delete() {	
	int id = Integer.parseInt(request.getParameter("id"));
	studentService.Delate(id);
	return "del";
}

public String add() {
	String name = request.getParameter("name");
	Integer age = Integer.parseInt(request.getParameter("age"));
	Student student=new Student(null, name, age);
	studentService.AddStudent(student);
	
	return "add";
}

public String toupdate() {
	int id = Integer.parseInt(request.getParameter("id"));
	Student student=studentService.findById(id);
	request.setAttribute("student", student);
	return "toupdate";
	
}

public String update() {
	int id = Integer.parseInt(request.getParameter("id"));
	String name = request.getParameter("name");
	Integer age = Integer.parseInt(request.getParameter("age"));
	Student student=new Student(id, name, age);
	studentService.UpdateStudent(student);
	return "update";
	
}

}
6、struts.xml中的代码

       
       /index.jsp
       
       
       
       findList
       
       
       
       findList
       
       
       
       /update.jsp
       
       
       
       findList
       

7、jsp页面

index.jsp

add.jsp

update.jsp

ok~ struts+jsp+jdbc就算完成啦 祝大家事业有成！

ps:转载要注明出处哦