新增游客查看各个用户项目的功能之显示用户列表后端

src/main/java/com/web/web_assignment/DatabaseService.java

@@ -188,6 +188,21 @@ public class DatabaseService {
         return null;
     }
 
+    public ArrayList<String> getAllUsers() {
+        ArrayList<String> users = new ArrayList<>();
+        String sql = "SELECT username FROM users";
+        try (Connection conn = getConnection();
+             PreparedStatement stmt = conn.prepareStatement(sql)) {
+            ResultSet rs = stmt.executeQuery();
+            while (rs.next()) {
+                users.add(rs.getString("username"));
+            }
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
+        return users;
+    }
+
     public void saveProjects(String username, List<Project> projects) throws SQLException {
         try (Connection conn = getConnection()) {
             for (Project project : projects) {

src/main/java/com/web/web_assignment/ProjectBean.java

@@ -37,6 +37,8 @@ public class ProjectBean implements Serializable {
         return "jdbc:derby:testDB;create=true";
     }
 
+    private List<String> users;
+
     @PostConstruct
     public void init() {
         loadProjects(); // Load projects from the database
@@ -46,6 +48,7 @@ public class ProjectBean implements Serializable {
             Project emptyProject = new Project("", "", "", new ArrayList<>(), "", new ArrayList<>(), "", "");
         }
         setProject(projects.get(0)); // Set the first project as the current project
+        users = databaseService.getAllUsers();
     }
 
     @PreDestroy
@@ -202,6 +205,17 @@ public class ProjectBean implements Serializable {
         return username;
     }
 
+    public String visitorSetUsername(String username) {
+        this.username = username;
+        loadProjects();
+        if (!projects.isEmpty()) {
+            setProject(projects.get(0));
+        } else {
+            setProject(new Project("", "", "", new ArrayList<>(), "", new ArrayList<>(), "", ""));
+        }
+        return "project";
+    }
+
     public void setUsername(String username) {
         this.username = username;
     }
@@ -273,4 +287,12 @@ public class ProjectBean implements Serializable {
     public Boolean getIsLoggedIn() {
         return isLoggedIn;
     }
+
+    public List<String> getUsers() {
+        return users;
+    }
+
+    public void setUsers(List<String> users) {
+        this.users = users;
+    }
 }