SpringMVC——CRUD操作
目录
- SpringMVC的CRUD操作
一、SpringMVC完成CRUD
0、导入相关依赖
<dependency>
<groupId>junitgroupId>
<artifactId>junitartifactId>
<version>4.12version>
dependency>
<dependency>
<groupId>org.springframeworkgroupId>
<artifactId>spring-webmvcartifactId>
<version>5.1.9.RELEASEversion>
dependency>
<dependency>
<groupId>javax.servletgroupId>
<artifactId>servlet-apiartifactId>
<version>2.5version>
dependency>
<dependency>
<groupId>javax.servlet.jspgroupId>
<artifactId>jsp-apiartifactId>
<version>2.2version>
dependency>
<dependency>
<groupId>javax.servletgroupId>
<artifactId>jstlartifactId>
<version>1.2version>
dependency>
<dependency>
<groupId>org.projectlombokgroupId>
<artifactId>lombokartifactId>
<version>1.18.10version>
<scope>providedscope>
dependency>
<dependency>
<groupId>com.fasterxml.jackson.coregroupId>
<artifactId>jackson-databindartifactId>
<version>2.9.10version>
dependency>
<dependency>
<groupId>com.fasterxml.jackson.coregroupId>
<artifactId>jackson-coreartifactId>
<version>2.9.10version>
dependency>
<dependency>
<groupId>com.fasterxml.jackson.coregroupId>
<artifactId>jackson-annotationsartifactId>
<version>2.9.10version>
dependency>
<dependency>
<groupId>javax.servletgroupId>
<artifactId>jstlartifactId>
<version>1.2version>
dependency>
<dependency>
<groupId>org.springframeworkgroupId>
<artifactId>spring-webmvcartifactId>
<version>5.2.2.RELEASEversion>
dependency>
<dependency>
<groupId>org.springframeworkgroupId>
<artifactId>spring-jdbcartifactId>
<version>5.2.2.RELEASEversion>
dependency>
<dependency>
<groupId>org.projectlombokgroupId>
<artifactId>lombokartifactId>
<version>1.18.8version>
dependency>
<dependency>
<groupId>junitgroupId>
<artifactId>junitartifactId>
<version>4.12version>
<scope>testscope>
dependency>
<dependency>
<groupId>org.springframeworkgroupId>
<artifactId>spring-testartifactId>
<version>5.2.2.RELEASEversion>
dependency>
<dependency>
<groupId>mysqlgroupId>
<artifactId>mysql-connector-javaartifactId>
<version>5.1.4version>
dependency>
<dependency>
<groupId>com.alibabagroupId>
<artifactId>druidartifactId>
<version>1.1.5version>
dependency>
<dependency>
<groupId>org.aspectjgroupId>
<artifactId>aspectjweaverartifactId>
<version>1.9.4version>
dependency>
<dependency>
<groupId>org.hibernategroupId>
<artifactId>hibernate-validatorartifactId>
<version>6.1.0.Finalversion>
dependency>
<dependency>
<groupId>com.fasterxmlgroupId>
<artifactId>classmateartifactId>
<version>1.3.1version>
dependency>
<dependency>
<groupId>javax.validationgroupId>
<artifactId>validation-apiartifactId>
<version>2.0.1.Finalversion>
dependency>
<dependency>
<groupId>org.jboss.logginggroupId>
<artifactId>jboss-loggingartifactId>
<version>3.3.0.Finalversion>
dependency>
<dependency>
<groupId>commons-fileuploadgroupId>
<artifactId>commons-fileuploadartifactId>
<version>1.3.3version>
dependency>
<dependency>
<groupId>commons-iogroupId>
<artifactId>commons-ioartifactId>
<version>2.4version>
dependency>
<dependency>
<groupId>javax.servletgroupId>
<artifactId>javax.servlet-apiartifactId>
<version>4.0.1version>
dependency>
1、设计数据库表
CREATE TABLE `employee` (
`id` bigint(20) NOT NULL AUTO_INCREMENT,
`username` varchar(20) DEFAULT NULL,
`password` varchar(40) DEFAULT NULL,
`age` int(11) DEFAULT NULL,
`hiredate` date DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=40 DEFAULT CHARSET=utf8;
配置文件
#key=value
jdbc.driverClassName=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/springmvc
jdbc.username=root
jdbc.password=1111
jdbc.initialSize=2
实体类
package com.sunny.domain;
import lombok.Data;
import org.springframework.format.annotation.DateTimeFormat;
import javax.validation.constraints.Max;
import javax.validation.constraints.Min;
import javax.validation.constraints.NotNull;
import javax.validation.constraints.Size;
import java.util.Date;
@Data
public class Employee {
private Long id;
@NotNull(message = "用户名不能为空")
@Size(max = 10, min = 4, message = "用户名在4-10位之间")
private String username;
@NotNull(message = "密码不能为空")
@Size(max = 10, min = 4, message = "密码在4-10位之间")
private String password;
@NotNull(message = "年龄不能为空")
@Min(value = 18, message = "年龄最小值为18")
@Max(value = 60, message = "年龄最大值为60")
private Integer age;
@DateTimeFormat(pattern = "yyyy-MM-dd")
private Date hiredate;
}
2、控制层代码
LoginController
@Controller
public class LoginController {
@Autowired
private IEmployeeService service;
@RequestMapping("/login")
public String login(String username, String password, HttpSession session){
System.out.println("LoginController.login");
Employee current = service.login(username, password);
if (current == null){
session.setAttribute("errorMsg", "账号或密码错误");
return "redirect:/login.jsp";
}
session.setAttribute("user_in_session", current);
return "redirect:/employee/list";
}
/* @RequestMapping("/login")
public String login(String username, String password, HttpSession session) {
try {
service.login(username, password);
} catch (Exception e) {
session.setAttribute("errorMsg", e.getMessage());
return "redirect:/login.jsp";
}
return "redirect:/employee/list";
}*/
}
EmployeeController
@Controller
@RequestMapping("/employee")
public class EmployeeController {
@Autowired
private IEmployeeService employeeService;
@RequestMapping("/list")
public String list(Model model) {
//int a = 1 / 0;
// 共享数据到list界面
model.addAttribute("employees", employeeService.listAll());
return "employee/list"; // 跳转到list界面
}
// 新增员工
@RequestMapping("/input")
public String input(Model model, Long id) {
if (id != null) {
model.addAttribute("employee", employeeService.get(id));
} else {
model.addAttribute("employee", new Employee());
}
return "employee/input";
}
/* @RequestMapping("/saveOrUpdate")
public String saveOrUpdate(Employee emp){
if (emp.getId() == null){
employeeService.save(emp);
} else {
employeeService.update(emp);
}
return "redirect:/employee/list";
}*/
@RequestMapping("/saveOrUpdate")
public String saveOrUpdate(@Valid Employee emp, BindingResult bindingResult, Model model) {
List<ObjectError> errors = bindingResult.getAllErrors();
if (errors.size() > 0) {
model.addAttribute("errors", errors);
return "employee/input";
}
if (emp.getId() == null) {
employeeService.save(emp);
} else {
employeeService.update(emp);
}
return "redirect:/employee/list";
}
@RequestMapping("/delete")
public String delete(Long id) {
if (id != null) {
employeeService.delete(id);
}
return "redirect:/employee/list";
}
}
拦截器代码:CheckLoginInterceptor
public class CheckLoginInterceptor implements HandlerInterceptor {
// 在请求处理方法之前执行
// 如果返回true,执行下一个拦截器
// 如果返回false,就不执行下一个拦截器
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
// 没有登录的情况
if (request.getSession().getAttribute("user_in_session") == null){
System.out.println("----------------");
response.sendRedirect("/login.jsp");
return false; // 阻止往后放行
}
// 放行,给下一个拦截器或者最终的处理器
return true;
}
// 在请求处理方法执行之后执行
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
}
// 在dispatcherServlet处理后执行,做清理工作
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
}
}
3、业务层代码
public interface IEmployeeService {
void save(Employee emp);
void update(Employee emp);
void delete(Long id);
Employee get(Long id);
List<Employee> listAll();
Employee login(String username, String password);
/*void login(String username, String password);*/
}
@Service("employeeServiceImpl")
@Transactional
public class EmployeeServiceImpl implements IEmployeeService {
@Autowired
private IEmployeeDAO dao;
public void save(Employee emp) {
dao.save(emp);
//int a = 1/0;
}
public void update(Employee emp) {
dao.update(emp);
}
public void delete(Long id) {
dao.delete(id);
}
@Transactional(readOnly = true)
public List<Employee> listAll() {
return dao.listAll();
}
@Transactional(readOnly = true)
public Employee get(Long id) {
return dao.get(id);
}
@Transactional(readOnly = true)
public Employee login(String username, String password) {
return dao.login(username, password);
}
/* public void login(String username, String password){
Employee current = dao.login(username, password);
if (current == null){
throw new RuntimeException("账号或密码错误!");
}
UserContext.setCurrentUser(current);
}*/
}
4、持久层代码
public interface IEmployeeDAO {
void save(Employee emp);
void update(Employee emp);
void delete(Long id);
Employee get(Long id);
List<Employee> listAll();
Employee login(String username, String password);
}
public class EmployeeDAOImpl implements IEmployeeDAO {
private JdbcTemplate jdbcTemplate;
public void setDataSource(DataSource ds) {
this.jdbcTemplate = new JdbcTemplate(ds);
}
public void save(Employee e) {
jdbcTemplate.update("INSERT INTO employee (username,password,age,hiredate) VALUES (?,?,?,?)", e.getUsername(),
e.getPassword(), e.getAge(), e.getHiredate());
}
public void update(Employee e) {
jdbcTemplate.update("UPDATE employee SET username= ?,password=?,age = ?,hiredate=? WHERE id= ?",
e.getUsername(), e.getPassword(), e.getAge(), e.getHiredate(), e.getId());
}
public void delete(Long id) {
jdbcTemplate.update("DELETE FROM employee WHERE id = ?", id);
}
public Employee get(Long id) {
String sql = "SELECT id,username,password,age,hiredate FROM employee WHERE id = ?";
List<Employee> list = jdbcTemplate.query(sql, new Object[]{id}, new RowMapper<Employee>() {
public Employee mapRow(ResultSet rs, int i) throws SQLException {
Employee e = new Employee();
e.setId(rs.getLong("id"));
e.setUsername(rs.getString("username"));
e.setPassword(rs.getString("password"));
e.setAge(rs.getInt("age"));
e.setHiredate(rs.getDate("hiredate"));
return e;
}
});
return list.size() == 1 ? list.get(0) : null;
}
public List<Employee> listAll() {
String sql = "SELECT id,username,password,age,hiredate FROM employee";
List<Employee> listAll = jdbcTemplate.query(sql, new Object[]{}, new RowMapper<Employee>() {
public Employee mapRow(ResultSet rs, int i) throws SQLException {
Employee e = new Employee();
e.setId(rs.getLong("id"));
e.setUsername(rs.getString("username"));
e.setPassword(rs.getString("password"));
e.setAge(rs.getInt("age"));
e.setHiredate(rs.getDate("hiredate"));
return e;
}
});
return listAll;
}
public Employee login(String username, String password) {
String sql = "SELECT id,username,password,age,hiredate FROM employee WHERE username = ? AND password = ?";
List<Employee> list = jdbcTemplate.query(sql, new Object[]{username, password}, new RowMapper<Employee>() {
public Employee mapRow(ResultSet rs, int i) throws SQLException {
Employee e = new Employee();
e.setId(rs.getLong("id"));
e.setUsername(rs.getString("username"));
e.setPassword(rs.getString("password"));
e.setAge(rs.getInt("age"));
e.setHiredate(rs.getDate("hiredate"));
return e;
}
});
return list.size() == 1 ? list.get(0) : null;
}
}
全局异常控制
/**
* Description: 处理全局的异常,当发现异常,自动跳转到error.jsp
*
* @author zygui
* @date 2020/3/7 10:21
*/
@ControllerAdvice
public class HandleExceptionAdviceController {
//@ExceptionHandler(XxxException.class) // 对XxxException异常做处理
@ExceptionHandler // 默认就是对Exception做处理
public String error(Model model, Exception ex){
model.addAttribute("errorMsg", ex.getMessage());
return "/commons/error";
}
}
5、web.xml
<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">
<filter>
<filter-name>CharacterEncodingFilterfilter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilterfilter-class>
<init-param>
<param-name>encodingparam-name>
<param-value>utf-8param-value>
init-param>
<init-param>
<param-name>forceRequestEncodingparam-name>
<param-value>trueparam-value>
init-param>
<init-param>
<param-name>forceResponseEncodingparam-name>
<param-value>trueparam-value>
init-param>
filter>
<filter-mapping>
<filter-name>CharacterEncodingFilterfilter-name>
<url-pattern>/*url-pattern>
filter-mapping>
<servlet>
<servlet-name>springMVCservlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServletservlet-class>
<init-param>
<param-name>contextConfigLocationparam-name>
<param-value>classpath:springmvc-servlet.xmlparam-value>
init-param>
<load-on-startup>1load-on-startup>
servlet>
<servlet-mapping>
<servlet-name>springMVCservlet-name>
<url-pattern>/url-pattern>
servlet-mapping>
web-app>
6、applicationContext.xml
<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:tx="http://www.springframework.org/schema/tx"
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/tx http://www.springframework.org/schema/tx/spring-tx.xsd">
<context:annotation-config/>
<context:property-placeholder location="classpath:db.properties" system-properties-mode="NEVER" />
<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close">
<property name="driverClassName" value="${jdbc.driverClassName}" />
<property name="url" value="${jdbc.url}" />
<property name="username" value="${jdbc.username}" />
<property name="password" value="${jdbc.password}" />
<property name="initialSize" value="${jdbc.initialSize}" />
bean>
<bean id="txManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource" />
bean>
<tx:annotation-driven transaction-manager="txManager"/>
beans>
7、springmvc-servlet.xml
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc https://www.springframework.org/schema/mvc/spring-mvc.xsd">
<import resource="classpath:applicationContext.xml"/>
<context:component-scan base-package="com.sunny"/>
<mvc:default-servlet-handler />
<mvc:annotation-driven/>
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" id="InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/views/"/>
<property name="suffix" value=".jsp"/>
bean>
beans>
8、相关jsp页面
login.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>登录界面title>
head>
<body>
<h3>登录界面h3>
<form action="/login" method="post">
账号:<input type="text" name="username"><br>
密码:<input type="password" name="password"><br>
<input type="submit" value="登录"><br>
form>
<span style="color: red">${errorMsg}span>
<%
session.invalidate();
%>
body>
html>
list.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<head>
<title>Titletitle>
head>
<body>
<span>恭喜${user_in_session.username}:登录成功span>
<span style="color: blue"><a href="/login">注销a>span>
<h3>员工列表h3>
<a href="/employee/input">新增a>
<table border="1" cellpadding="0" cellspacing="0" width="500">
<tr>
<th>IDth>
<th>用户名th>
<th>密码th>
<th>入职时期th>
<th>操作th>
tr>
<c:forEach items="${employees}" var="e">
<tr>
<td>${e.id}td>
<td>${e.username}td>
<td>${e.password}td>
<td>${e.hiredate}td>
<td>
<a href="/employee/delete?id=${e.id}">删除a>
<a href="/employee/input?id=${e.id}">编辑a>
td>
tr>
c:forEach>
table>
body>
html>
input.jsp(新增联系人)
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form" %>
<html>
<head>
<title>Titletitle>
head>
<body>
<h3>编辑员工h3>
<form:form action="/employee/saveOrUpdate" modelAttribute="employee">
<form:hidden path="id"/><br>
账号:<form:input path="username"/> <form:errors path="username" cssStyle="color: red"/><br>
密码:<form:password path="password" showPassword="true"/> <form:errors path="password"
cssStyle="color: red"/> <br>
年龄:<form:input path="age"/> <form:errors path="age" cssStyle="color: red"/> <br>
入职:<form:input path="hiredate"/><br>
<input type="submit" value="保存"><br>
form:form>
<hr>
<%-- <c:forEach items="${errors}" var="error">
<div style="color: red">${error.defaultMessage}div>
c:forEach>
<h3>编辑员工h3>
<form action="/employee/saveOrUpdate" method="post">
<input type="hidden" name="id" value="${employee.id}">
账号:<input type="text" name="username" value="${employee.username}"><br>
密码:<input type="password" name="password" value="${employee.password}"><br>
年龄:<input type="text" name="age" value="${employee.age}"><br>
入职:<input type="text" name="hiredate" value="${employee.hiredate}"><br>
<input type="submit" value="保存">
form>--%>
body>
html>
error.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" isErrorPage="true" %>
<html>
<head>
<title>错误页面title>
head>
<body>
出错了:<%= exception%> <br>
${ex}<br>
${errorMsg}<br>
body>
html>