SpringMVC 增删改查实例

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最新推荐文章于 2025-07-01 23:55:14 发布

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本文详细介绍了SpringMVC框架中进行增删改查操作的步骤，包括MVC包的创建规范，实体类的建立，XML及资源文件的配置，以及如何实现数据提取和业务逻辑控制。

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MVC布局格式:
1.MVC包的创建格式(https://img-blog.csdnimg.cn/20181108082144443.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQzNDU1NDEw,size_16,color_FFFFFF,t_70)
2.创建实体类

package cn.ps.entity;

import org.hibernate.validator.constraints.NotBlank;

import javax.validation.constraints.DecimalMax;
import javax.validation.constraints.DecimalMin;
import javax.validation.constraints.Pattern;
import javax.validation.constraints.Size;

public class MySqlUser {
	private int id;
	@NotBlank(message = "学生姓名不能为空")
	private String name;
	@DecimalMin(value="1",message = "年龄不能小于1岁")
	@DecimalMax(value="130",message = "年龄最大为130岁")
	private String age;
	private String sex;
	@Pattern(regexp = ".+@.+\\..+",message = "邮箱格式错误")
	private String eamil;
	@Size(max = 11,min = 11,message = "手机号码必须为11位数")
	private String phone;
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getSex() {
		return sex;
	}
	public void setSex(String sex) {
		this.sex = sex;
	}
	public String getAge() {
		return age;
	}

	public void setAge(String age) {
		this.age = age;
	}

	public String getEamil() {
		return eamil;
	}

	public void setEamil(String eamil) {
		this.eamil = eamil;
	}

	public String getPhone() {
		return phone;
	}

	public void setPhone(String phone) {
		this.phone = phone;
	}

	
	
}

3.配置XML文件和资源文件

web.xml文件
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
         version="4.0">
<!--关联一个空的jsp-->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:spring.xml</param-value>
    </context-param>
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    <!-- 过滤springmvc的请求  将请求字符集修改为UTF-8-->
    <filter>
        <filter-name>fgf</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <init-param>
            <param-name>encoding</param-name>
            <param-value>UTF-8</param-value>
        </init-param>
        <!-- 设置请求头-->
        <init-param>
            <param-name>forceRequestEncoding</param-name>
            <param-value>true</param-value>
        </init-param>
        <!--设置请求体-->
        <init-param>
            <param-name>forceResponseEncoding</param-name>
            <param-value>true</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>fgf</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
        <!--
            springmvc 支持 rest风格
        -->
        <filter>
            <filter-name>httpFile</filter-name>
            <filter-class>org.springframework.web.filter.HiddenHttpMethodFilter</filter-class>
        </filter>
        <filter-mapping>
            <filter-name>httpFile</filter-name>
            <url-pattern>/*</url-pattern>
        </filter-mapping>
        <!--
            中央处理器
        -->
        <servlet>
            <servlet-name>DispatcherServlet</servlet-name>
            <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
            <load-on-startup>1</load-on-startup>
            <init-param>
                <param-name>contextConfigLocation</param-name>
                <param-value>/WEB-INF/springweb.xml</param-value>
            </init-param>
        </servlet>
        <servlet-mapping>
            <servlet-name>DispatcherServlet</servlet-name>
            <url-pattern>/</url-pattern>
        </servlet-mapping>

</web-app>

springweb.xml文件
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
       http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
       http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd
">
        <context:component-scan base-package="cn"></context:component-scan>
        <context:property-placeholder location="classpath:/jdbc.properties"/>
        <!--启用验证-->
        <mvc:annotation-driven></mvc:annotation-driven>
        <bean id="dataSource" class="org.apache.commons.dbcp2.BasicDataSource">
                <property name="driverClassName" value="${jdbcDriver}"></property>
                <property name="url" value="${jdbcUrl}"></property>
                <property name="username" value="${jdbcUsername}"></property>
                <property name="password" value="${jdbcPassword}"></property>
        </bean>
        <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
                <property name="dataSource" ref="dataSource"></property>
        </bean>
</beans>

pom.xml文件
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>cn.ps</groupId>
    <artifactId>SpringMVCRest</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>war</packaging>
    <dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>4.3.20.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>4.3.19.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>commons-lang</groupId>
            <artifactId>commons-lang</artifactId>
            <version>2.1</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.39</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.apache.commons/commons-dbcp2 -->
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-dbcp2</artifactId>
            <version>2.5.0</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/javax.servlet/jstl -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.hibernate/hibernate-validator -->
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-validator</artifactId>
            <version>5.3.6.Final</version>
        </dependency>

    </dependencies>
    <!-- 设定tomcat一些参数  字符集 端口-->
    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.tomcat.maven</groupId>
                <artifactId>tomcat7-maven-plugin</artifactId>
                <version>2.2</version>
                <configuration>
                    <uriEncoding>UTF-8</uriEncoding>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

4.数据的提取和业务的逻辑控制

控制层
 package cn.ps.coutroller;


import cn.ps.entity.MySqlUser;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import cn.ps.service.EmpService;
import cn.ps.utils.PagerBean;
import org.springframework.ui.ModelMap;
import org.springframework.validation.Errors;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

import javax.validation.Valid;


 @Controller
public class DataCoutroller {
	@Autowired
	private EmpService service;

	 /**
	  * 多条件搜索
	  *  传参   /emps?stu=1&curPage=2&pageNum=3
	  * @param stu
	  * @param curPage
	  * @param pageNum
	  * @param map
	  * @return
	  */
	@RequestMapping(value = "/emps",method = RequestMethod.GET)
	public String listEmp(String stu, String curPage, String pageNum, ModelMap map)  {
		try {
			PagerBean<MySqlUser> pb=service.queryClass(stu,curPage,pageNum);
			map.put("pb",pb);
			return "/showemp.jsp";
		}  catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return null;
	}
     @RequestMapping(value = "/emp",method = RequestMethod.POST)
     public String addEmp(@Valid  MySqlUser emp, Errors er, ModelMap map)  {
			if(er.hasErrors()){
				return "/add.jsp";
			}
            service.addEmp(emp);
            return listEmp(null,null,null,map);
     }
	 @RequestMapping(value = "/emp/{id}",method = RequestMethod.PUT)
	 public String updateEmp(@PathVariable  String id,@Valid  MySqlUser emp, Errors er, ModelMap map)  {
		 emp.setId(Integer.parseInt(id));
		 if(er.hasErrors()){
			 map.addAttribute("id",id);
			 return "/update.jsp";
		 }
		 service.updateEmp(emp);
		 return listEmp(null,null,null,map);
	 }
	 @RequestMapping(value = "/emp/{id}",method = RequestMethod.DELETE)
	 public String deleteEmp(@PathVariable  String id, ModelMap map)  {
		 service.deleteEmp(id);
		 return listEmp(null,null,null,map);
	 }
}

dao层（数据层）
package cn.ps.dao.impl;

import java.sql.SQLException;
import java.util.List;
import java.util.Map;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.stereotype.Repository;

import com.mysql.jdbc.StringUtils;

import cn.ps.dao.EmpDao;
import cn.ps.entity.MySqlUser;



@Repository
public class EmpDaoImpl implements EmpDao {
	@Autowired
	private JdbcTemplate jdbcTemplate;
	public int countEmp(String name) throws SQLException {
		String sql="SELECT count(*) as myCount FROM stu1";
		if(!StringUtils.isNullOrEmpty(name)) {
			sql+=" where name like '%"+name+"%'";
		}
		Map map =jdbcTemplate.queryForMap(sql);
		return Integer.parseInt(map.get("myCount").toString());
	}


	public List<MySqlUser> queryClass(String name,int startIndex,int pageNum) throws Exception {
		String sql="SELECT * FROM stu1";
		if(!StringUtils.isNullOrEmpty(name)) {
			sql+=" where name like '%"+name+"%'";
		}
		sql+=" limit "+startIndex+","+pageNum;
		List<MySqlUser> list=jdbcTemplate.query(sql,new BeanPropertyRowMapper<MySqlUser>(MySqlUser.class));
		return list;
	}
	public void addEmp(MySqlUser emp) {
		String sql="insert into stu1(name,age,eamil,sex,phone) values(?,?,?,?,?)";
		jdbcTemplate.update(sql,emp.getName(),emp.getAge(),emp.getEamil(),emp.getSex(),emp.getPhone());
	}

	public void deleteEmp(String id) {
		String sql="delete from stu1 where id=?";
		jdbcTemplate.update(sql,id);
	}

	public void updateEmp(MySqlUser emp) {
		String sql="update stu1 set name=?,age=?,eamil=?,sex=?,phone=? where id=?";
		jdbcTemplate.update(sql,emp.getName(),emp.getAge(),emp.getEamil(),emp.getSex(),emp.getPhone(),emp.getId());
	}

}

Service层（服务层）
package cn.ps.service.impl;


import java.util.List;


import org.apache.commons.lang.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import cn.ps.dao.EmpDao;

import cn.ps.entity.MySqlUser;
import cn.ps.service.EmpService;
import cn.ps.utils.PagerBean;


@Service
public class EmpServiceImpl implements EmpService {
	@Autowired
	private EmpDao dao; 
	public PagerBean<MySqlUser> queryClass(String name,String curPage,String pageNum) throws Exception{
		//第一次访问 没有当前页
		if(StringUtils.isEmpty(curPage)) {
			curPage="1";
		}
		if(StringUtils.isEmpty(pageNum)) {
			pageNum="10";
		}
		
		//转换成int类型
		int curPageIn=Integer.parseInt(curPage);
		int pageNumIn=Integer.parseInt(pageNum);
		int total=dao.countEmp(name);
		PagerBean<MySqlUser> pd=new PagerBean<MySqlUser>(curPageIn, pageNumIn, total);
		List<MySqlUser> queryClass=dao.queryClass(name,pd.getStartIndex(),pd.getPageNum());
		pd.setData(queryClass);
		return pd;
	}

	public void addEmp(MySqlUser emp) {
		dao.addEmp(emp);
	}

	public void deleteEmp(String id) {
		dao.deleteEmp(id);
	}

	public void updateEmp(MySqlUser emp) {
		dao.updateEmp(emp);
	}

}

```java
查询 jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8" %>
  <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
  
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
<style type="text/css">
	table{
		border-collapse: collapse;
	}
	th{
		border: 1px solid #ccc;
	
	}
	td{
		border: 1px solid #ccc;
	}

</style>
</head>
<body>
	<form action="${pageContext.request.contextPath}/emps">
		学生姓名:<input type="text" name='stu'><input type="submit" value="查询">
        <input type="button" value="新增" onclick="window.location='${pageContext.request.contextPath}/add.jsp'">
	</form>
	<table style="width:80%">
		<tr>
			<td>id</td>
			<td>学生姓名</td>
			<td>年龄</td>
            <td>邮箱</td>
			<td>性别</td>
            <td>手机号码</td>
			<td>操作</td>
		</tr>
	<c:forEach  var="tt" items="${requestScope.pb.data}">
		<tr>
			<td>${tt.id}</td>
			<td>${tt.name}</td>
			<td>${tt.age}</td>
            <td>${tt.eamil}</td>
            <td>${tt.sex}</td>
            <td>${tt.phone}</td>
			<td><form action="${pageContext.request.contextPath}/emp/${tt.id}" method="post">
				<input type="hidden" name="_method" value="delete"/>
				<input type="submit" value="删除"/>&nbsp;
				<input type="button" value="修改"onclick="window.location='${pageContext.request.contextPath}/update.jsp?id=${tt.id}&name=${tt.name}&age=${tt.age}&eamil=${tt.eamil}&sex=${tt.sex}&phone=${tt.phone}'"/>

			</form>
			</td>
		</tr>
	</c:forEach> 
	</table>
	<a href="${pageContext.request.contextPath}/emps?curPage=${requestScope.pb.prePage}&stu=${param.stu}">上一页</a>
	<c:forEach var="i" begin="1" end="${requestScope.pb.totalPage}" step="1">
		<a href="emps?curPage=${i}">${i}</a>
	</c:forEach>
	当前页是:${requestScope.pb.curPage}  总页数是:${requestScope.pb.totalPage}  总条数是:${requestScope.pb.total}
	<a href="${pageContext.request.contextPath}/emps?curPage=${requestScope.pb.nextPage}&stu=${param.stu}">下一页</a>
</body>
</html>

新增(add.jsp)
<%--
  Created by IntelliJ IDEA.
  User: Administrator
  Date: 2018-11-07
  Time: 上午 10:47
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib prefix="s" uri="http://www.springframework.org/tags/form" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
    <form method="post" action="${pageContext.request.contextPath}/emp">
        <h1>新增学生</h1>
        <hr>
        学生姓名:<input type="text" name="name"><font color="red"><s:errors path="mySqlUser.name"></s:errors> </font><br/>
        年龄:<input type="text" name="age"><font color="red"><s:errors path="mySqlUser.age"></s:errors></font><br/>
        邮箱:<input type="text" name="eamil"><font color="red"><s:errors path="mySqlUser.eamil"></s:errors></font><br/>
        性别:<input type="text" name="sex"><br/>
        手机号码:<input type="text" name="phone"><font color="red"><s:errors path="mySqlUser.phone"></s:errors></font><br/>
        <input type="submit" value="提交">
        <input type="button" value="返回"onclick="window.location='${pageContext.request.contextPath}/emps'">
        <hr>
        
    </form>
</body>
</html>

修改(update.jsp)
<%--
  Created by IntelliJ IDEA.
  User: Administrator
  Date: 2018-11-07
  Time: 上午 10:47
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib prefix="s" uri="http://www.springframework.org/tags/form" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
    <form method="post" action="${pageContext.request.contextPath}/emp/${param.id==null?requestScope.id:param.id}">
        <input type="hidden" value="put" name="_method">
        <h1>修改学生</h1>
        <hr>
        学生姓名:<input type="text" name="name" value="${param.name}"><font color="red"><s:errors path="mySqlUser.name"></s:errors> </font><br/>
        年龄:<input type="text" name="age" value="${param.age}"><font color="red"><s:errors path="mySqlUser.age"></s:errors></font><br/>
        邮箱:<input type="text" name="eamil" value="${param.eamil}"><font color="red"><s:errors path="mySqlUser.eamil"></s:errors></font><br/>
        性别:<input type="text" name="sex" value="${param.sex}"><br/>
        手机号码:<input type="text" name="phone" value="${param.phone}"><font color="red"><s:errors path="mySqlUser.phone"></s:errors></font><br/>
        <input type="submit" value="提交">
        <input type="button" value="返回"onclick="window.location='${pageContext.request.contextPath}/emps'">
        <hr>
    </form>
</body>
</html>