springboot hibernate jsp

Spring Boot 是一个用于创建独立运行的Spring应用程序的框架。Hibernate 是一个流行的Java ORM框架，用于将Java对象映射到关系数据库中。JSP（JavaServer Pages）是一种用于创建动态Web页面的Java技术。

在使用Spring Boot和Hibernate时，可以通过注解来轻松配置和使用Hibernate。同时，Spring Boot也提供了对JSP的支持，可以使用Thymeleaf、Freemarker等模板引擎来创建动态页面。

以下是一个基于Spring Boot、Hibernate和JSP的示例项目：

1. 配置pom.xml文件，添加相关依赖

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-jpa</artifactId>
    </dependency>
    
    <dependency>
        <groupId>org.apache.tomcat.embed</groupId>
        <artifactId>tomcat-embed-jasper</artifactId>
    </dependency>
    
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>jstl</artifactId>
    </dependency>
    
    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-validator</artifactId>
    </dependency>
    
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-validation</artifactId>
    </dependency>
    
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-security</artifactId>
    </dependency>
    
    <dependency>
        <groupId>org.springframework.security</groupId>
        <artifactId>spring-security-test</artifactId>
        <scope>test</scope>
    </dependency>
</dependencies>

2. 创建实体类User，使用Hibernate注解进行映射

@Entity
@Table(name = "users")
public class User {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;
    
    @NotBlank
    @Size(min = 3, max = 50)
    private String username;

    @NotBlank
    @Size(max = 120)
    private String password;
    
    // getters and setters
}

3. 创建数据访问层Repository，继承自JpaRepository

public interface UserRepository extends JpaRepository<User, Long> {
    Optional<User> findByUsername(String username);
}

4. 创建控制层Controller，使用Spring MVC注解进行配置

@Controller
@RequestMapping("/users")
public class UserController {
    @Autowired
    private UserRepository userRepository;
    
    @GetMapping
    public String list(Model model) {
        model.addAttribute("users", userRepository.findAll());
        return "users/list";
    }
    
    @GetMapping("/{id}")
    public String view(@PathVariable("id") Long id, Model model) {
        User user = userRepository.findById(id)
            .orElseThrow(() -> new IllegalArgumentException("Invalid user Id:" + id));
        model.addAttribute("user", user);
        return "users/view";
    }
    
    @GetMapping("/new")
    public String createForm(Model model) {
        model.addAttribute("user", new User());
        return "users/create";
    }
    
    @PostMapping
    public String create(@Valid User user, BindingResult result) {
        if (result.hasErrors()) {
            return "users/create";
        }
        userRepository.save(user);
        return "redirect:/users";
    }
    
    @GetMapping("/{id}/edit")
    public String updateForm(@PathVariable("id") Long id, Model model) {
        User user = userRepository.findById(id)
            .orElseThrow(() -> new IllegalArgumentException("Invalid user Id:" + id));
        model.addAttribute("user", user);
        return "users/update";
    }
    
    @PostMapping("/{id}")
    public String update(@PathVariable("id") Long id, @Valid User user, BindingResult result) {
        if (result.hasErrors()) {
            user.setId(id);
            return "users/update";
        }
        userRepository.save(user);
        return "redirect:/users";
    }
    
    @DeleteMapping("/{id}")
    public String delete(@PathVariable("id") Long id) {
        userRepository.deleteById(id);
        return "redirect:/users";
    }
}

5. 创建视图页面，使用JSP模板引擎进行渲染

<!-- /src/main/resources/templates/users/list.jsp -->
<table>
    <thead>
        <tr>
            <th>Username</th>
            <th></th>
        </tr>
    </thead>
    <tbody>
        <c:forEach items="${users}" var="user">
            <tr>
                <td>${user.username}</td>
                <td>
                    <a href="<c:url value='/users/${user.id}'/>">View</a>
                    <a href="<c:url value='/users/${user.id}/edit'/>">Edit</a>
                    <form action="<c:url value='/users/${user.id}'/>" method="post">
                        <input type="hidden" name="_method" value="delete"/>
                        <input type="submit" value="Delete"/>
                    </form>
                </td>
            </tr>
        </c:forEach>
    </tbody>
</table>

<a href="<c:url value='/users/new'/>">New User</a>


<!-- /src/main/resources/templates/users/view.jsp -->
<h1>${user.username}</h1>

<a href="<c:url value='/users/${user.id}/edit'/>">Edit</a>
<form action="<c:url value='/users/${user.id}'/>" method="post">
    <input type="hidden" name="_method" value="delete"/>
    <input type="submit" value="Delete"/>
</form>


<!-- /src/main/resources/templates/users/create.jsp -->
<h1>Create User</h1>

<form action="<c:url value='/users'/>" method="post">
    <div>
        <label for="username">Username:</label>
        <input type="text" id="username" name="username" value="${user.username}" required/>
        <span th:if="${#fields.hasErrors('username')}" th:errors="*{username}"></span>
    </div>
    <div>
        <label for="password">Password:</label>
        <input type="password" id="password" name="password" value="${user.password}" required/>
        <span th:if="${#fields.hasErrors('password')}" th:errors="*{password}"></span>
    </div>
    <div>
        <button type="submit">Create</button>
    </div>
</form>


<!-- /src/main/resources/templates/users/update.jsp -->
<h1>Edit User</h1>

<form action="<c:url value='/users/${user.id}'/>" method="post">
    <input type="hidden" name="_method" value="put"/>
    <div>
        <label for="username">Username:</label>
        <input type="text" id="username" name="username" value="${user.username}" required/>
        <span th:if="${#fields.hasErrors('username')}" th:errors="*{username}"></span>
    </div>
    <div>
        <label for="password">Password:</label>
        <input type="password" id="password" name="password" value="${user.password}" required/>
        <span th:if="${#fields.hasErrors('password')}" th:errors="*{password}"></span>
    </div>
    <div>
        <button type="submit">Update</button>
    </div>
</form>

这就是一个基于Spring Boot、Hibernate和JSP的示例项目。通过使用注解配置，可以轻松地创建一个简单的Web应用程序。同时，使用Thymeleaf、Freemarker等模板引擎也可以很容易地替换JSP。