前期准备
使用idea新建个SpringBoot项目
在数据库中建student表
建包
1.编写entity包下实体类Student
(一个Javabean规范)
package com.example.stu.kudestu.stu.entity; import javax.persistence.*; @Entity @Table(name = "student") //@Entity 应用在实体类上 @Table(name = "student") 应用在实体类上,并且name属性为数据库表名 public class Student { @Id @GeneratedValue(strategy = GenerationType.IDENTITY) //ID自增 private Integer id; private String name; private int age; private String sex; @Override public String toString() { return "Student{" + "id=" + id + ", name='" + name + '\'' + ", age=" + age + ", sex='" + sex + '\'' + '}'; } public Student() { } 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 int getAge() { return age; } public void setAge(int age) { this.age = age; } public String getSex() { return sex; } public void setSex(String sex) { this.sex = sex; } }
2.编写dao层StudentDao类
package com.example.stu.kudestu.stu.dao; import com.example.stu.kudestu.stu.entity.Student; import org.springframework.data.jpa.repository.JpaRepository; import org.springframework.data.jpa.repository.Query; import org.springframework.data.repository.query.Param; import java.util.List; public interface StudentDao extends JpaRepository<Student,Integer> { //<Student,Integer>两个参数实体类和主键类型 Student findStuById(Integer id); @Query(name="findStuByName",nativeQuery = true,value = "select * from student where name=:name ") List<Student> findStuByName(@Param("name") String name); }
3.编写service层类StudentService,面象接口
import com.example.stu.kudestu.stu.entity.Student; import org.springframework.data.domain.Page; import java.util.List; public interface StudentService { Student save(Student student);//添加学生 Student update(Student student);//修改 void delete(Integer id);//通过id删除学生 Student findStuById(Integer id);//通过ID查找学生,接口中没有此方法,在StudentDao接口创建 List<Student> findStuByName(String name);//通过学生姓名查找,在StudentDao接口创建 /** * 分页查询所有数据 * @param page //当前页 * @param pageSize //每页记录数 * @return */ Page<Student> findAll(int page,int pageSize); }
在service对接口实现
import org.springframework.stereotype.Service; import java.util.List; @Service public class StudentServiceimpl implements StudentService { @Autowired//用于类中的属性注入 private StudentDao studentDao; @Override public Student save(Student student) { return studentDao.save(student); } @Override public Student update(Student student) { return studentDao.save(student); } @Override public void delete(Integer id) { studentDao.deleteById(id); } @Override public Student findStuById(Integer id) { return studentDao.findStuById(id); } @Override public List<Student> findStuByName(String name) { return studentDao.findStuByName(name); } @Override public Page<Student> findAll(int page,int pageSize) { Pageable pageable= PageRequest.of(page,pageSize); return studentDao.findAll(pageable); } }
4.编写Controller层StudentController类
package com.example.stu.kudestu.stu.controller; import com.example.stu.kudestu.stu.dao.StudentDao; import com.example.stu.kudestu.stu.entity.Student; import com.example.stu.kudestu.stu.service.StudentService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.data.domain.Page; import org.springframework.web.bind.annotation.*; import javax.servlet.http.HttpServletResponse; import java.util.List; @RestController /*应用在Controller层的类上面 @RequestMapping("/s") public class StudentController { @Autowired//依赖注入 private StudentService studentService; /** * 添加学生 * @param student 要添加学生对象 * @return */ @PostMapping("/add") /*@PostMapping 映射一个POST请求 Spring MVC新特性 提供了对Restful风格的支持 @GetMapping,处理get请求 @PostMapping,处理post请求 @PutMapping,处理put请求 @DeleteMapping,处理delete请求 */ public Student save(Student student){ return studentService.save(student); } /** * 修改学生 * @param student */ @PostMapping("/update") public Student update(Student student){ return studentService.save(student); } /** * 删除学生 * @param id 要删除学生id * @return */ @GetMapping("/del/{id}") public String del(@PathVariable int id){ studentService.delete(id); return "yes"; } @GetMapping("/findByName/{name}") public List<Student> findByName(@PathVariable String name){ return studentService.findStuByName(name); } @GetMapping("/query") public Page<Student> findByPage(Integer page , HttpServletResponse response){ response.setHeader("Access-Control-Allow-Origin","*"); //解决跨域请求 if(page==null||page<=0){ page=0; }else{ page-=1; } return studentService.findAll(page,5); } }
@RestController
应用在Controller层的类上面,@RestController注解相当于@ResponseBody + @Controller合在一起的作用,同时返回的数据为json数据
使用@Controller 注解,在对应的方法上,视图解析器可以解析return 的jsp,html页面,并且跳转到相应页面
若返回json等内容到页面,则需要加@ResponseBody注解
@PostMapping(value = "/add")等价于@RequestMapping(value = "/add",method = RequestMethod.POST)
5.利用HBuilder进行前端编写
Jquery.js内容到https://apps.bdimg.com/libs/jquery/2.1.4/jquery.min.js复制即可
主页面:index.html
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title></title> <script src="js/jquery.js" type="text/javascript" charset="utf-8"></script> <script type="text/javascript"> var page = 1; var tp = 0; $(function(){ showData(); }); function upPage(){ if(page>1){ page--; showData(); } } function downPage(){ if(page<tp){ page++; showData(); } } function showData(){ $.ajax({ url:'http://localhost:8888/stu/s/query?page='+page, success:function(result){ var rel = result.content; tp = result.totalPages; var htmlStr = "<table width='80%' algin='center' border='1'>"+ "<tr><th>ID</th><th>姓名</th><th>年龄</th><th>性别</th><th>操作</th></tr>"; for(var i=0;i<rel.length;i++){ var stu = rel[i]; htmlStr += "<tr><td>"+stu.id+"</td><td>"+stu.name+"</td><td>"+stu.age+"</td><td>"+stu.sex+"</td>"+ "<td><a href=''>编辑</a> <a href='http://localhost:8888/stu/s/del/"+stu.id+"'>删除</a></td></tr>"; } htmlStr += "</table>"; $("#show").html(htmlStr); } }); } </script> </head> <body> <h2 >学生管理系统</h2> <hr> <a href="add.html" rel="external nofollow" >添加学生</a> <div id="show"> </div> <a href="javascript:upPage();" rel="external nofollow" >上一页</a> <a href="javascript:downPage();" rel="external nofollow" >下一页</a> </body> </html>
页面效果
添加学生的页面信息add.html
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title></title> </head> <body> <h2>添加学生</h2> <hr> <form action="http://localhost:8888/stu/s/add" method="post"> <p> 姓名:<input type="text" name="name" /> </p> <p> 年龄:<input type="text" name="age" /> </p> <p> 性别: <input type="radio" name="sex" value="男" checked />男 <input type="radio" name="sex" value="女" />女 </p> <p> <input type="submit" value="保存" /> </p> </form> </body> </html>
页面效果
'
如何利用分页
直接调用Dao接口的父类JPA接口的分页方法
在Service接口层定义:
/** * 分页查询所有数据 * @param page * @param pageSize * @return */ Page<Student> findAll(int page,int pageSize);
Service实现:
public Page<Student> findAll(int page,int pageSize) { Pageable pageable= PageRequest.of(page,pageSize); return studentDao.findAll(pageable); }
Controller层:
@GetMapping("/query") public Page<Student> findByPage(Integer page , HttpServletResponse response){ response.setHeader("Access-Control-Allow-Origin","*"); if(page==null||page<=0){ page=0; }else{ page-=1; } return studentService.findAll(page,5); }
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持亿速云。
免责声明:本站发布的内容(图片、视频和文字)以原创、转载和分享为主,文章观点不代表本网站立场,如果涉及侵权请联系站长邮箱:is@yisu.com进行举报,并提供相关证据,一经查实,将立刻删除涉嫌侵权内容。