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2020java框架教程之spring的RESTful的CRUD实现

1.创建实体类

2.创建dao

@Repository
public class UsersDao {
    private static Map<Integer, User> map=null;

    static{
        map=new HashMap<Integer, User>();
        map.put(1,new User(1,"admin","admin",25,"admin@qq.com",
                new Address(1,"ah","000")));
        map.put(2,new User(2,"admin2","admin2",11,"admin2@qq.com",
                new Address(2,"ah2","002")));
        map.put(3,new User(3,"admin3","admin3",11,"admin3@qq.com",
                new Address(3,"ah3","003")));
        map.put(4,new User(4,"admin4","admin4",11,"admin4@qq.com",
                new Address(4,"ah4","004")));
    }



    private static Integer initid=5;
    public void save(User user){
        if (user.getId() == null) {
            user.setId(initid++);
        }
        map.put(user.getId(),user);
    }
    //查询所有
    public Collection<User> getAll(){
        return map.values();
    }
    //查询单个
    public User getId(Integer id){
        return map.get(id);
    }
    //移除
    public void delete(Integer id){
        map.remove(id);
    }
}

3.控制层

@RequestMapping("/admin")
@Controller
@SessionAttributes(value = {"user"},types = {String.class})
public class UserController {
    @Autowired
    private UsersDao usersDao;
    /////////////RESTful风格///////////////
    //查询所有
    @RequestMapping(value = "/list",method = RequestMethod.GET)
    public String list(Model model){
        Collection<User> list = usersDao.getAll();
        model.addAttribute("list",list);
        return "admin/list";
    }
    //删除
    @RequestMapping(value = "/{id}",method = RequestMethod.DELETE)
    public String delete(@PathVariable(value = "id") Integer id){
        System.out.println("执行删除，已删除"+id);
        usersDao.delete(id);
        return "redirect:/admin/list";
    }
    //添加表单
    @RequestMapping(value = "/add",method = RequestMethod.GET)
    public String add(){
        System.out.println("add");
        return "admin/add";
    }
    //添加
    @RequestMapping(value = "/",method = RequestMethod.POST)
    public String save(User user){
        System.out.println("save");
        usersDao.save(user);
        return "redirect:/admin/list";
    }
    //修改表单
    @RequestMapping(value = "/{id}",method = RequestMethod.GET)
    public String updateForm(@PathVariable(value = "id") Integer id,Model model){
        System.out.println("edit");
        User user = usersDao.getId(id);
        model.addAttribute("user",user);
        return "admin/updateForm";
    }
    //修改
    @RequestMapping(value = "/",method = RequestMethod.PUT)
    public String update(User user){
        System.out.println("执行修改，已修改");
        usersDao.save(user);
        return "redirect:/admin/list";
    }
}

4.查询所有表单页

<h1>用户列表</h1>
<a href="add">添加用户</a>
<table border="1">
    <tr>
        <th>id</th>
        <th>username</th>
        <th>password</th>
        <th>age</th>
        <th>email</th>
        <th>address</th>
        <th>操作</th>
    </tr>
    <c:forEach var="users" items="${list}">
        <tr>
            <td>${users.id}</td>
            <td>${users.username}</td>
            <td>${users.password}</td>
            <td>${users.age}</td>
            <td>${users.email}</td>
            <td>${users.address}</td>
            <td>
                <a href="javascript:void(0)" onclick="deleteById(${users.id})">删除</a>
                <a href="${pageContext.request.contextPath}/admin/${users.id}" onclick="updateById(${users.id})">修改</a>
            </td>
        </tr>
    </c:forEach>
</table>
<form method="post" id="deleteForm">
    <input type="text" name="_method" value="DELETE">
    <button>删除</button>
</form>

<script>
    function deleteById(id){
        var form=document.getElementById('deleteForm');
        form.action=id;
        document.getElementById('deleteForm').submit();
    }
    function updateById(id){
        document.getElementById('updateForm').submit();
    }
</script>

5.添加表单页面

<form action="${pageContext.request.contextPath}/admin/" method="post">
    <label>id : <input type="text" id="id" name="id"></label><br>
    <label for="username">
        username : <input type="text" id="username" name="username"><br>
    </label>
    <label for="password">
        password : <input type="password" name="password" id="password"><br>
    </label>
    <label for="age">
        age : <input type="text" name="age" id="age"><br>
    </label>
    <label for="email">
        email : <input type="email" name="email" id="email"><br>
    </label>
    <label for="address.addr">
        addr : <input type="text" name="address.addr" id="address.addr"><br>
    </label>
    <label for="address.zipCode">
        zipCode : <input type="text" name="address.zipCode" id="address.zipCode"><br>
    </label>
    <button>submit</button>
</form>

6.修改表单页面

<form action="${pageContext.request.contextPath}/admin/" method="post">
    <input type="hidden" name="_method" value="PUT">
    <label for="id">id : <input type="text" id="id" name="id" value="${user.id}"></label><br>
    <label for="username">
        username : <input type="text" id="username" name="username" value="${user.username}"><br>
    </label>
    <label for="password">
        password : <input type="password" name="password" id="password" value="${user.password}"><br>
    </label>
    <label for="age">
        age : <input type="text" name="age" id="age" value="${user.age}"><br>
    </label>
    <label for="email">
        email : <input type="email" name="email" id="email" value="${user.email}"><br>
    </label>
    <label for="address.addr">
        addr : <input type="text" name="address.addr" id="address.addr" value="${sessionScope.user.address.addr}"><br>
    </label>
    <label for="address.zipCode">
        zipCode : <input type="text" name="address.zipCode" id="address.zipCode" value="${user.address.zipCode}"><br>
    </label>
    <button>submit</button>
</form>