SSM整合版本一之普通的CRUD
程序员文章站
2022-03-27 12:37:46
项目简介(1)项目的经典模块-CRUD功能(2)什么是CRUDCRUD:Create( 创 建 )Retrieve(查询)Update(更新)Delete(删除)使用的技术栈:ssm:SpringMVC+Spring+MyBatis本篇为V1:V1 : ssmV2 : ssm+AjaxV3 : ssm+Ajax+bootstrapSSM环境搭建参考V2版本测试后台代码是否正确@RunWith(SpringJUnit4ClassRunner.class)@ContextConf...
项目简介
- (1)项目的经典模块-CRUD功能
- (2)什么是CRUD
CRUD:Create( 创 建 )Retrieve(查询)Update(更新)Delete(删除)
使用的技术栈:ssm:SpringMVC+Spring+MyBatis -
本篇为V1:
V1 : ssm
V2 : ssm+Ajax
V3 : ssm+Ajax+bootstrap
SSM环境搭建参考V2版本
- 测试后台代码是否正确
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:applicationContext.xml")
public class TestUserService {
private static final Logger log = Logger.getLogger(TestUserService.class.getName());
@Autowired
UserService userService;
@Test
public void test01() {
List<User> list = userService.findAllUser();
log.info("list"+list);
}
}
- User
private int id;
private String username;
private String password;
public User() {
}
@Override
public String toString() {
return "User{" +
"id=" + id +
", username='" + username + '\'' +
", password='" + password + '\'' +
'}';
}
- UserServiceImpl(方法已写)
@Service
public class UserServiceImpl implements UserService {
@Autowired
UserDao userDao;
@Override
public void saveUser(User user) {
userDao.save(user);
}
@Override
public void deleteUser(int id) {
userDao.deleteById(id);
}
@Override
public int login(User u) {
return 0;
}
@Override
public List<User> findAllUser() {
List<User> list = userDao.finAllUser();
return list;
}
@Override
public User findByUserId(int id) {
return userDao.findById(id);
}
@Override
public void updateUserById(User user) {
userDao.update(user);
}
}
- UserDao
List<User> finAllUser();
void save(User user);
void deleteById(int id);
void update(User user);
User findById(int id);
- UserDao.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<!-- User findByName(String username);-->
<mapper namespace="cn.htl.dao.UserDao">
<select id="finAllUser" resultType="user">
select * from user order by id asc;
</select>
<insert id="save" parameterType="user">
insert into user (username,password) values (#{username},#{password}) ;
</insert>
<delete id="deleteById" parameterType="int">
delete from user where id =#{id};
</delete>
<update id="update" parameterType="user">
update user set password = #{password} where id = #{id};
</update>
<select id="findById" parameterType="int" resultType="user">
select * from user where id = #{id};
</select>
</mapper>
Controller层:代码显示
- DepartmentController(方法已写)
@Controller
@RequestMapping("/user")
public class UserController {
private static final Logger log = LoggerFactory.getLogger(UserController.class);
@Autowired
private UserService userService;
@RequestMapping(path = "/list", method = RequestMethod.GET)
public String list(Model model) {
List<User> users = userService.findAllUser();
log.info("list=" + users);
model.addAttribute("users", users);
return "list_user";
}
@RequestMapping(path = "/addUser", method = RequestMethod.GET)
public String AddUser() {
log.info("AddUser");
return "add_user";
}
@RequestMapping(path = "/addUser", method = RequestMethod.POST)
public String SaveUser(User user, Model model) {
if (user.getUsername() != null && !"".equals(user.getUsername())) {
userService.saveUser(user);
log.info("AddUser" + user);
return "redirect:/user/list";
} else {
model.addAttribute("error_msg","添加用户不能为空");
return "forward:/error";
}
}
@RequestMapping(path = "/deleteUser", method = RequestMethod.GET)
public String DeleteUser(Integer id) {
log.info("DeleteUser" + id);
userService.deleteUser(id);
return "redirect:/user/list";
}
@RequestMapping(path = "/updateUser", method = RequestMethod.GET)
public String Update(Integer id,Model model) {
log.info("UpdateUser"+id);
User user = userService.findByUserId(id);
model.addAttribute("user",user);
return "update_user";
}
@RequestMapping(path = "/update", method = RequestMethod.POST)
public String UpdateUser(User user) {
log.info("UpdateUser user"+user);
userService.updateUserById(user);
return "redirect:/user/list";
}
}
前台页面代码
- add_user.jsp
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<form method="post" action="${pageContext.request.contextPath}/user/addUser">
<input type="text" name="username"/><br/>
<input type="text" name="password"/><br/>
<input type="submit" value="保存"/><br/>
</form>
</body>
</html>
- list_user.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<head>
<title>Title</title>
</head>
<body>
${users}
<table border="1px" width="100%">
<tr>
<td>编号</td>
<td>用户名</td>
<td>密码</td>
<td>操作</td>
</tr>
<c:forEach items="${users}" var="user">
<tr>
<td>${user.id}</td>
<td>${user.username}</td>
<td>${user.password}</td>
<td><a href="${pageContext.request.contextPath}/user/deleteUser?id=${user.id}">删除</a>
<a href="${pageContext.request.contextPath}/user/updateUser?id=${user.id}">修改</a></td>
</tr>
</c:forEach>
</table>
</body>
</html>
- update_user.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<form method="post" action="${pageContext.request.contextPath}/user/update">
<input type="hidden" name="id" value="${user.id}" >
<input type="text" value="${user.username}" disabled="disabled"/><br/>
<input type="text" value="${user.password}" disabled="disabled"/><br/>
<input type="text" name="password" value="${user.password}"/><br/>
<input type="submit" value="修改密码"/><br/>
</form>
</body>
</html>
- form表单 不会将 标记为disabled="disabled"作为参数提交到后台
- 所以,必须增加一个type="hidden"的input标签
本文地址:https://blog.csdn.net/weixin_45114005/article/details/109259807