最近刚学了spring mvc框架,感觉确实方便了不少,减少了大量的冗余代码。就自己做了个小项目练练手,这是个初级的spring mvc应用的项目,没有用到mybatis,项目功能还算完善,实现了基本的增删改查的功能。
项目环境:
系统:win10
开发环境:eclipse Oxygen Release Candidate 3 (4.7)
jdk版本:java1.8(121)
mysql:5.7
spring:4.0
tomcat:8.5
用到的技术:
spring mvc
spring
jsp
jdbc
javaBean
js
jstl
访问地址:http://localhost:8080/你的项目名/all
声明:我只是一个刚入门不久的新手,所写代码难免有出错之处,如发现欢迎各位指出
下面就贴上详细过程
##1. 首先创建一个web项目(Dynamic Web Project)
项目名字就自己写了,不再详细写
##2. 这是我的已完成项目结构
我只是为了实现功能,没有用到接口,只用了简单的三个类,bean包下的实体类,dao层数据库访问类,controller层的界面控制类,
所有引用的jar包都在/WebContent/WEB-INF/lib文件夹下,这点与普通的java项目不同。
package bean;
public class Student {
private Integer id;//学生id
private String name;//学生姓名
private Double javaScore;//java成绩
private Double htmlScore;//html成绩
private Double cssScore;//css成绩
private Double totalScore;
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 Double getJavaScore() {
return javaScore;
}
public void setJavaScore(Double javaScore) {
this.javaScore = javaScore;
}
public Double getHtmlScore() {
return htmlScore;
}
public void setHtmlScore(Double htmlScore) {
this.htmlScore = htmlScore;
}
public Double getCssScore() {
return cssScore;
}
public void setCssScore(Double cssScore) {
this.cssScore = cssScore;
}
public Double getTotalScore() {
return totalScore;
}
public void setTotalScore(Double totalScore) {
this.totalScore = totalScore;
}
}
package dao;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Types;
import java.util.List;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.RowMapper;
import bean.Student;
public class StudentDao {
/**
* @Fields jdbcTemplate : TODO
*/
private JdbcTemplate jdbcTemplate;
/**
* spring提供的类
*
* @param jdbcTemplate
* 返回值类型: void
* @author janinus
*/
public void setJdbcTemplate(JdbcTemplate jdbcTemplate) {
this.jdbcTemplate = jdbcTemplate;
}
/**
* 查询所有学生
*
* @return 返回值类型: List
* @author janinus
*/
public List queryAll() {
String sql = "select id,name,javaScore,htmlScore,cssScore from student";
//将查询结果映射到Student类中,添加到list中,并返回
return jdbcTemplate.query(sql, new StudentMapper());
}
/**
* 通过姓名查询
*
* @param name
* @return 返回值类型: List
* @author janinus
*/
public List queryByName(String name) {
String sql = "select id,name,javaScore,htmlScore,cssScore from student where name like '%" + name + "%'";
return jdbcTemplate.query(sql, new StudentMapper());
}
/**
* 添加学生
*
* @param student
* @return 返回值类型: boolean
* @author janinus
*/
public boolean addStu(Student student) {
String sql = "insert into student(id,name,javaScore,htmlScore,cssScore) values(0,?,?,?,?)";
return jdbcTemplate.update(sql,
new Object[] { student.getName(), student.getJavaScore(), student.getHtmlScore(),
student.getCssScore() },
new int[] { Types.VARCHAR, Types.DOUBLE, Types.DOUBLE, Types.DOUBLE }) == 1;
}
/**
* 删除学生
*
* @param id
* @return 返回值类型: boolean
* @author janinus
*/
public boolean deleteStu(Integer id) {
String sql = "delete from student where id = ?";
return jdbcTemplate.update(sql, id) == 1;
}
/**
* 更新学生信息
*
* @param student
* @return 返回值类型: boolean
* @author janinus
*/
public boolean updateStu(Student student) {
String sql = "update student set name=? ,javaScore=?,htmlScore = ? ,cssScore = ? where id = ?";
Object stuObj[] = new Object[] { student.getName(), student.getJavaScore(), student.getHtmlScore(),
student.getCssScore(), student.getId() };
return jdbcTemplate.update(sql, stuObj) == 1;
}
/**
* 返回总成绩前n名学生
*
* @param num
* @return 返回值类型: List
* @author janinus
*/
public List topNum(int num) {
String sql = "select id,name,javaScore+htmlScore+cssScore from student order by javaScore+htmlScore+cssScore desc ,name asc limit ?";
return jdbcTemplate.query(sql, new RowMapper() {
@Override
public Student mapRow(ResultSet rs, int rowNum) throws SQLException {
// TODO Auto-generated method stub
Student student = new Student();
student.setId(rs.getInt(1));
student.setName(rs.getString(2));
student.setTotalScore(rs.getDouble(3));
return student;
}
}, num);
}
/**
*
* StudentMapper数据库映射
*
* @ClassName StudentMapper
* @author janinus
* @date 2017年6月27日
* @Version V1.0
*/
class StudentMapper implements RowMapper {
@Override
public Student mapRow(ResultSet rs, int rowNum) throws SQLException {
// TODO Auto-generated method stub
Student student = new Student();
student.setId(rs.getInt(1));
student.setName(rs.getString(2));
student.setJavaScore(rs.getDouble(3));
student.setHtmlScore(rs.getDouble(4));
student.setCssScore(rs.getDouble(5));
return student;
}
}
}
package controller;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import bean.Student;
import dao.StudentDao;
@Controller
public class StudentController {
/**
*
* 从数据库中获取全部学生信息,将数据返回给主页index,jsp
*
* @param model
* @return 返回值类型: String
* @author janinus
*/
@RequestMapping(value = "/all")
public String queryAll(Model model) {
ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
//从ioc容器中获取dao
StudentDao dao = (StudentDao) context.getBean("dao");
model.addAttribute("students", dao.queryAll());
model.addAttribute("tops", dao.topNum(3));
return "index.jsp";
}
/**
* 通过姓名查找学生,使用模糊查找,将结果返回给index.jsp
*
* @param name
* @param model
* @return 返回值类型: String
* @author janinus
*/
@RequestMapping(value = "/queryByName")
public String queryByName(String name, Model model) {
ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
//从ioc容器中获取dao
StudentDao dao = (StudentDao) context.getBean("dao");
model.addAttribute("students", dao.queryByName(name));
model.addAttribute("tops", dao.topNum(3));
return "index.jsp";
}
/**
* 添加新学生,并将结果返回给all页面,由all转发到主页
* @param name
* @param javaScore
* @param htmlScore
* @param cssScore
* @param model
* @return 返回值类型: String
* @author janinus
*/
@RequestMapping(value = "/add")
public String addStu(String name, String javaScore, String htmlScore, String cssScore, Model model) {
ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
StudentDao dao = (StudentDao) context.getBean("dao");
Student student = new Student();
student.setName(name);
student.setJavaScore(Double.parseDouble(javaScore));
student.setHtmlScore(Double.parseDouble(htmlScore));
student.setCssScore(Double.parseDouble(cssScore));
boolean result = dao.addStu(student);
if (result)
model.addAttribute("msg", "");
else
model.addAttribute("msg", "");
return "all";
}
/**
* 通过id删除学生
* @param id
* @param model
* @return 返回值类型: String
* @author janinus
*/
@RequestMapping(value = "/deleteById")
public String deleteById(String id, Model model) {
ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
StudentDao dao = (StudentDao) context.getBean("dao");
boolean result = dao.deleteStu(Integer.parseInt(id));
if (result)
model.addAttribute("msg", "");
else
model.addAttribute("msg", "");
return "all";
}
/**
*
* @param id
* @param name
* @param javaScore
* @param htmlScore
* @param cssScore
* @param model
* @return 返回值类型: String
* @author janinus
*/
@RequestMapping(value = "/update")
public String updateStu(String id, String name, String javaScore, String htmlScore, String cssScore, Model model) {
ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
StudentDao dao = (StudentDao) context.getBean("dao");
Student student = new Student();
student.setId(Integer.parseInt(id));
student.setName(name);
student.setJavaScore(Double.parseDouble(javaScore));
student.setHtmlScore(Double.parseDouble(htmlScore));
student.setCssScore(Double.parseDouble(cssScore));
boolean result = dao.updateStu(student);
if (result)
model.addAttribute("msg", msg("修改成功"));
else
model.addAttribute("msg", msg("修改失败"));
return "all";
}
/**
* 要弹出的页面消息
* @param msg
* @return 返回值类型: String
* @author janinus
*/
public String msg(String msg) {
return "";
}
}
所有的java代码已经完成,下面只剩下具体的xml配置和前端页面。
由于是一个简单的小项目,我的js,css都在同一个页面,没有分开,只有两个页面,
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib prefix="fn"
uri="http://java.sun.com/jsp/jstl/functions" %>
<%@ taglib prefix="c"
uri="http://java.sun.com/jsp/jstl/core" %>
学生管理
${msg }
学生管理
所有学生
id
名称
java分数
html分数
css分数
操作
${student.id }
${student.name }
${student.javaScore }
${student.htmlScore }
${student.cssScore }
删除|编辑
前三名
排名
id
姓名
总分数
第${i.index+1 }名
${student.id }
${student.name }
${student.totalScore }
如不显示请:点此刷新
查找学生
添加学生
编辑学生
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
Insert title here
进入主页
这是spring的ioc容器的配置文件,用来实现依赖注入,下面是具体代码:
为我们实现了servlet的大部分代码,我们只需要写业务实现即可。下面是具体代码
这是web工程的配置文件,下面是主要代码:
encodingFilter
org.springframework.web.filter.CharacterEncodingFilter
encoding
utf-8
/all
index.html
index.htm
springMVC
org.springframework.web.servlet.DispatcherServlet
1
springMVC
/
这个项目是个我的日常练习项目,为了更加熟练,我把完整的过程又回顾了一遍,又熟悉了很多,
项目用的jar包附录:
除了spring的包外,还有mysql-jbdc的jar包和jstl的jar包
下载地址:
spring 框架jar包(可选版本): spring官网
mysql-jdbc.jar(可选版本):MySQL官网
jstl.jar( 可选版本):maven官方地址
2017年6月27日15:51:19