如何实现“Java项目计划表甘特图”
作为一名经验丰富的开发者，你可以帮助刚入行的小白实现Java项目计划表甘特图。下面是整个流程的步骤：
erDiagram
PROJECTS ||--o{ TASKS : has
- 创建项目计划表数据库并设计表结构：
```sql
CREATE TABLE PROJECTS (
project_id INT PRIMARY KEY,
project_name VARCHAR(255)
);
CREATE TABLE TASKS (
task_id INT PRIMARY KEY,
task_name VARCHAR(255),
start_date DATE,
end_date DATE,
project_id INT,
FOREIGN KEY (project_id) REFERENCES PROJECTS(project_id)
);
2. 编写Java代码连接数据库：
```markdown
```java
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
public class DatabaseConnection {
private Connection connection;
public DatabaseConnection() {
try {
connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/project_planner", "username", "password");
} catch (SQLException e) {
e.printStackTrace();
}
}
public Connection getConnection() {
return connection;
}
}
3. 创建项目和任务的实体类：
```markdown
```java
public class Project {
private int projectId;
private String projectName;
// getters and setters
}
public class Task {
private int taskId;
private String taskName;
private Date startDate;
private Date endDate;
private int projectId;
// getters and setters
}
4. 编写DAO类实现对数据库的操作：
```markdown
```java
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
public class ProjectDAO {
private Connection connection;
public ProjectDAO(Connection connection) {
this.connection = connection;
}
public void addProject(Project project) {
try {
PreparedStatement ps = connection.prepareStatement("INSERT INTO PROJECTS (project_id, project_name) VALUES (?, ?)");
ps.setInt(1, project.getProjectId());
ps.setString(2, project.getProjectName());
ps.executeUpdate();
} catch (SQLException e) {
e.printStackTrace();
}
}
public List<Project> getAllProjects() {
List<Project> projects = new ArrayList<>();
try {
PreparedStatement ps = connection.prepareStatement("SELECT * FROM PROJECTS");
ResultSet rs = ps.executeQuery();
while (rs.next()) {
Project project = new Project();
project.setProjectId(rs.getInt("project_id"));
project.setProjectName(rs.getString("project_name"));
projects.add(project);
}
} catch (SQLException e) {
e.printStackTrace();
}
return projects;
}
}
5. 创建RESTful API来获取项目和任务数据：
```markdown
```java
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.core.Response;
@Path("/projects")
public class ProjectResource {
@GET
public Response getAllProjects() {
List<Project> projects = new ProjectDAO(DatabaseConnection.getConnection()).getAllProjects();
return Response.ok(projects).build();
}
}
通过以上步骤，你可以实现Java项目计划表甘特图的功能。希望这篇文章对你有所帮助！
```mermaid
pie
title Tasks Distribution
"Analysis": 30
"Design": 20
"Coding": 40
"Testing": 10
结尾处，再次强调每一步骤的重要性，希望读者能够认真学习并实践，从中获得更多的经验和知识。祝你成功！
