springMVC实现增删改查

首先需要准备好一张数据库表我这里用emp这张表：具体代码：

 1 /*
 2 SQLyog 企业版 - MySQL GUI v8.14 
 3 MySQL - 5.1.73-community 
 4 *********************************************************************
 5 */
 6 /*!40101 SET NAMES utf8 */;
 7 
 8 create table `emp` (
 9     `empno` double ,
10     `ename` varchar (60),
11     `job` varchar (60),
12     `mgr` double ,
13     `hiredate` varchar (60),
14     `sal` float ,
15     `comm` float ,
16     `deptno` double 
17 ); 
18 insert into `emp` (`empno`, `ename`, `job`, `mgr`, `hiredate`, `sal`, `comm`, `deptno`) values('7369','SMITH','CLERK','7902','2018-10-28 10:22:37','800','0.565','10');
19 insert into `emp` (`empno`, `ename`, `job`, `mgr`, `hiredate`, `sal`, `comm`, `deptno`) values('7499','Allen','SALESMAN','7698','2018-10-28 10:22:37','1600','300','30');
20 insert into `emp` (`empno`, `ename`, `job`, `mgr`, `hiredate`, `sal`, `comm`, `deptno`) values('7521','Ward','SALESMAN','7698','2018-10-28 10:22:37','1250','500','30');
21 insert into `emp` (`empno`, `ename`, `job`, `mgr`, `hiredate`, `sal`, `comm`, `deptno`) values('7566','JONES','MANAGER','7839','2018-10-28 10:22:37','2975','0','20');
22 insert into `emp` (`empno`, `ename`, `job`, `mgr`, `hiredate`, `sal`, `comm`, `deptno`) values('7654','MARTIN','SALESMAN','7698','2018-10-28 10:22:37','1250','1400','30');
23 insert into `emp` (`empno`, `ename`, `job`, `mgr`, `hiredate`, `sal`, `comm`, `deptno`) values('7782','CLARK','MANAGER','7839','2018-10-28 10:22:37','2450',NULL,'10');
24 insert into `emp` (`empno`, `ename`, `job`, `mgr`, `hiredate`, `sal`, `comm`, `deptno`) values('7788','SCOTT','ANALYST','7566','2018-10-28 10:22:38','3000',NULL,'20');
25 insert into `emp` (`empno`, `ename`, `job`, `mgr`, `hiredate`, `sal`, `comm`, `deptno`) values('7839','KING','PRESIDENT',NULL,'2018-10-28 10:22:38','5000',NULL,'10');
26 insert into `emp` (`empno`, `ename`, `job`, `mgr`, `hiredate`, `sal`, `comm`, `deptno`) values('7844','TURNER','SALESMAN','7698','2018-10-28 10:22:38','1500','0','30');
27 insert into `emp` (`empno`, `ename`, `job`, `mgr`, `hiredate`, `sal`, `comm`, `deptno`) values('7876','ADAMS','CLERK','7788','2018-10-28 10:22:38','1100',NULL,'20');
28 insert into `emp` (`empno`, `ename`, `job`, `mgr`, `hiredate`, `sal`, `comm`, `deptno`) values('7902','FORD','ANALYST','7566','2018-10-28 10:22:38','3000',NULL,'20');

然后开始我们的增删改查工作：

第一步：建立一个Maven项目，我们这里命名为"lianxicrud"，然后配置pom.xml：需要的jar包有：jstl，javax.servlet-api，spring-web，spring-webmvc，

spring-jdbc，mysql

 1  2   xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
 3   4.0.0
 4   web01
 5   lianxicrud
 6   war
 7   0.0.1-SNAPSHOT
 8   lianxicrud Maven Webapp
 9   http://maven.apache.org
10   
11     
12       junit
13       junit
14       3.8.1
15       test
16     
17     
18     
19         javax.servlet
20         jstl
21         1.2
22     
23     
24     
25         javax.servlet
26         javax.servlet-api
27         4.0.1
28         provided
29     
30     
31     
32         org.springframework
33         spring-web
34         5.0.8.RELEASE
35     
36     
37     
38         org.springframework
39         spring-webmvc
40         5.0.8.RELEASE
41     
42     
43     
44         org.springframework
45         spring-jdbc
46         5.0.8.RELEASE
47     
48     
49     
50         mysql
51         mysql-connector-java
52         5.1.47
53     
54   
55   
56     lianxicrud
57   
58 

第二步：在WEB-INF下：建立springMVC-servlet.xml文件。配置springMVC-servlet.xml和WEB-INF下的web.xml

1.springMVC-servlet.xml：主要配置数据源，视图解析器，以及注册拦截器......

 1 
 2  3     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
 4     xmlns:mvc="http://www.springframework.org/schema/mvc"
 5     xsi:schemaLocation="http://www.springframework.org/schema/beans 
 6                         http://www.springframework.org/schema/beans/spring-beans.xsd 
 7                         http://www.springframework.org/schema/context 
 8                         http://www.springframework.org/schema/context/spring-context.xsd
 9                         http://www.springframework.org/schema/mvc 
10                         http://www.springframework.org/schema/mvc/spring-mvc.xsd">
11     package="controller" />
12     package="dao" />
13     package="biz" />
14     
15     
16     class="org.springframework.jdbc.datasource.DriverManagerDataSource">
17         
18         
19         
20         
21     
22     
23     24         class="org.springframework.jdbc.core.JdbcTemplate">
25         
26     
27     
28     29         class="org.springframework.web.servlet.view.InternalResourceViewResolver">
30         
31         
32     
33     
34     
35         class="interruptor.EncodeInterceptor"/>
36     
37     
38 

web.xml:

 1 app PUBLIC
 2  "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
 3  "http://java.sun.com/dtd/web-app_2_3.dtd" >
 4 
 5 
 6   Archetype Created Web Application
 7   
 8       springMVC
 9       class>org.springframework.web.servlet.DispatcherServletclass>
10   
11   
12       springMVC
13     *.mvc
14   
15 

第三步：编写bean，dao，biz，controller，以及处理字符编码集的interrupt

1.bean包：

package bean;

public class EmpBean {

    private Integer empNo;
    private String eName;
    private String job;
    private Integer mgr;
    private String hireDate;
    private Double sal;
    private Double comm;
    private Integer deptNo;
    public EmpBean() {
        // TODO Auto-generated constructor stub
    }
    public Integer getEmpNo() {
        return empNo;
    }
    public void setEmpNo(Integer empNo) {
        this.empNo = empNo;
    }
    public String geteName() {
        return eName;
    }
    public void seteName(String eName) {
        this.eName = eName;
    }
    public String getJob() {
        return job;
    }
    public void setJob(String job) {
        this.job = job;
    }
    public Integer getMgr() {
        return mgr;
    }
    public void setMgr(Integer mgr) {
        this.mgr = mgr;
    }
    public String getHireDate() {
        return hireDate;
    }
    public void setHireDate(String hireDate) {
        this.hireDate = hireDate;
    }
    public Double getSal() {
        return sal;
    }
    public void setSal(Double sal) {
        this.sal = sal;
    }
    public Double getComm() {
        return comm;
    }
    public void setComm(Double comm) {
        this.comm = comm;
    }
    public Integer getDeptNo() {
        return deptNo;
    }
    public void setDeptNo(Integer deptNo) {
        this.deptNo = deptNo;
    }
    @Override
    public String toString() {
        return "EmpBean [empNo=" + empNo + ", eName=" + eName + ", job=" + job + ", mgr=" + mgr + ", hireDate="
                + hireDate + ", sal=" + sal + ", comm=" + comm + ", deptNo=" + deptNo + "]";
    }
    
}

2.dao包：

 1 package dao;
 2 
 3 import java.sql.ResultSet;
 4 import java.sql.SQLException;
 5 import java.util.List;
 6 
 7 import org.springframework.beans.factory.annotation.Autowired;
 8 import org.springframework.jdbc.core.JdbcTemplate;
 9 import org.springframework.jdbc.core.RowMapper;
10 import org.springframework.stereotype.Repository;
11 
12 import bean.EmpBean;
13 
14 @Repository
15 public class EmpDAO {
16 
17     @Autowired
18     private JdbcTemplate jt;
19     
20     public void add(EmpBean eb) {
21         String sql = "insert into emp values(null,?,?,?,?,?,?,?)";
22         jt.update(sql, eb.geteName(),eb.getJob(),eb.getMgr(),eb.getHireDate(),eb.getSal(),eb.getComm(),eb.getDeptNo());
23     } 
24     
25     public void delete(int empNo) {
26         String sql = "delete from emp where empno = ?";
27         jt.update(sql,empNo);
28     }
29     
30     public void update(EmpBean eb) {
31         String sql = "update emp set ename=?,job=？，mgr=?,hiredate=?,sal=?,comm=?,daptno=? where empno=?";
32         jt.update(sql,eb.geteName(),eb.getJob(),eb.getMgr(),eb.getHireDate(),eb.getSal(),eb.getComm(),eb.getDeptNo(),eb.getEmpNo());
33     }
34     
35     public ListfindAll(){
36         String sql = "select * from emp";
37         return jt.query(sql, new RowMapperImpl());
38     }
39     
40     public EmpBean findById(int empNo) {
41         String sql = "select * from emp where empNo ='" + empNo +  "'";
42         return jt.query(sql, new RowMapperImpl()).get(0);
43     }
44 }
45 
46 class RowMapperImpl implements RowMapper{
47     //对象关系映射（ORM）,将查询出来的结果映射成类的属性
48     @Override
49     public EmpBean mapRow(ResultSet rs, int rowNum) throws SQLException {
50         EmpBean eb = new EmpBean();
51         eb.setEmpNo(rs.getInt(1));
52         eb.seteName(rs.getString(2));
53         eb.setJob(rs.getString(3));
54         eb.setMgr(rs.getInt(4));
55         eb.setHireDate(rs.getString(5));
56         eb.setSal(rs.getDouble(6));
57         eb.setComm(rs.getDouble(7));
58         eb.setDeptNo(rs.getInt(8));
59         return eb;
60     }
61 }

3.biz包：

 1 package biz;
 2 
 3 import java.util.List;
 4 
 5 import org.springframework.beans.factory.annotation.Autowired;
 6 import org.springframework.stereotype.Service;
 7 
 8 import bean.EmpBean;
 9 import dao.EmpDAO;
10 
11 @Service
12 public class EmpBiz {
13 
14     @Autowired
15     private EmpDAO edao;
16     public void add(EmpBean eb) {
17         edao.add(eb);
18     }
19     
20     public void delete(int empNo) {
21         edao.delete(empNo);
22     }
23     
24     public void update(EmpBean eb) {
25         edao.update(eb);
26     }
27     
28     public ListfindAll(){
29         return edao.findAll();
30     }
31     
32     public EmpBean findById(int empNo) {
33         return edao.findById(empNo);
34     }
35 }
36     

4.controller包：

 1 package controller;
 2 
 3 import javax.servlet.http.HttpServletRequest;
 4 
 5 import org.springframework.beans.factory.annotation.Autowired;
 6 import org.springframework.stereotype.Controller;
 7 import org.springframework.web.bind.annotation.RequestMapping;
 8 
 9 import bean.EmpBean;
10 import biz.EmpBiz;
11 
12 @Controller
13 @RequestMapping("/emp")
14 public class EmpController {
15     @Autowired
16     private EmpBiz eb;
17     @RequestMapping("/add")
18     public String add(EmpBean emp) {
19         eb.add(emp);
20         return "redirect:../index.jsp";
21     }
22     
23     @RequestMapping("/find")
24     public String findAll(HttpServletRequest request) {
25         request.getSession().setAttribute("ALLEMP",eb.findAll());
26         return "redirect:../index.jsp";
27     }
28     
29     @RequestMapping("/delete")
30     public String delete(int empNo) {
31         eb.delete(empNo);
32         return "redirect:../index.jsp";
33     }
34     
35     @RequestMapping("/findbyid")
36     public String findById(int empNo , HttpServletRequest request) {
37         request.getSession().setAttribute("EMPBEAN", eb.findById(empNo));
38         System.out.println("11111");
39         return "redirect:../update.jsp";
40     }
41     
42     @RequestMapping("/update")
43     public String update(EmpBean emp) {
44         eb.update(emp);
45         System.out.println("22222222");
46         return "redirect:../index.jsp";
47     }
48 }

interrupt包：

 1 package interruptor;
 2 
 3 import javax.servlet.http.HttpServletRequest;
 4 import javax.servlet.http.HttpServletResponse;
 5 
 6 import org.springframework.web.servlet.HandlerInterceptor;
 7 import org.springframework.web.servlet.ModelAndView;
 8 
 9 //建立一个拦截器（类似于Filter）
10 public class EncodeInterceptor implements HandlerInterceptor{
11 
12     @Override
13     public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
14             throws Exception {
15     }
16     
17     @Override
18     public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
19             ModelAndView modelAndView) throws Exception {
20     }
21     @Override
22     public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
23             throws Exception {
24         //针对post请求的编码集操作
25         request.setCharacterEncoding("utf-8");
26         response.setCharacterEncoding("utf-8");
27         return true;
28     }
29     
30 }

第四步：页面处理（为了方便index.jsp只查了这张表的姓名和员工编号，如果想显示更多可以进行查询，方法雷同）这里一定要注意加上isELIgnored="false",不然查不出来，下午找了一下午错误，原来忘了加这句话，哈哈

1.index.jsp：

 1 <%@ page language="java" pageEncoding="utf-8" isELIgnored="false" %>
 2 <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
 3 
 4 
 5     if test="${empty ALLEMP}">
 6         
 7     if>
 8     
 9     
10         ${ei.empNo}  ${ei.eName}
11         删除
12         修改
13         

14     
15 
16 

2.注册新员工页面：add.jsp：

 1 <%@ page language="java" pageEncoding="utf-8" isELIgnored="false"%>
 2 
 3 
 4 
 5 
15 
16 
17     

18         1920
公司员工注册表
212223242728293033343536394041424546474851525354575859606364656869

             

                     
             
        
             

                 
姓名
                 

25                     
26                 
             
             

                 
职位
                 

31                     
32                 
             
             

                 
上司
                 

37                     
38                 
             
             

                 
入职时间
                 

43                     
44                 
             
             

                 
薪资
                 

49                     
50                 
             
             

                 
奖金
                 

55                     
56                 
             
             

                 
部门
                 

61                     
62                 
             
             

                 

66                     
67                 
             
         
70     
71 
72 

3.修改页面：update.jsp：

 1 <%@ page language="java"  pageEncoding="utf-8" isELIgnored="false"%>
 2 
 3 
 4 
 5 
15 
16 
17 19     

20         
21         2223
修改员工信息
242526273031323336373839424344454849505154555657606162636667687172

             

                 
             
             

                 
姓名
                 

28                     
29                 
             
             

                 
职位
                 

34                     
35                 
             
             

                 
上司
                 

40                     
41                 
             
             

                 
入职时间
                 

46                     
47                 
             
             

                 
薪金
                 

52                     
53                 
             
             

                 
奖金
                 

58                     
59                 
             
             

                 
部门
                 

64                     
65                 
             
             

                 

69                     
70                 
             
         
73     
74 
75 
76 

以上四大步就是SpringMVC实现增删改查的具体操作。

下面我们来进行测试：

1.首先我们启动我们的服务器，然后访问我们的index.jsp页面（查找测试）：

2.访问add.jsp:并且填入新员工的信息（增加测试）：

点击提交：

小仙女添加进来了

然后点击修改进行修改测试：我们把小仙女改成老仙女

修改完成。

然后点击老仙女的删除（删除测试）

 

删除成功。

其实这个还可以加入BootStrap将页面进行美化操作