菜单支持多级

src/main/java/run/halo/app/model/dto/MenuOutputDTO.java

@@ -26,4 +26,6 @@ public class MenuOutputDTO implements OutputConverter<MenuOutputDTO, Menu> {
     private String target;
 
     private String icon;
+
+    private Integer parentId;
 }

src/main/java/run/halo/app/model/entity/Menu.java

@@ -58,6 +58,11 @@ public class Menu extends BaseEntity {
     @Column(name = "icon", columnDefinition = "varchar(50) default ''")
     private String icon;
 
+    /**
+     * Parent menu.
+     */
+    @Column(name = "parent_id", columnDefinition = "int default 0")
+    private Integer parentId;
 
     @Override
     public void prePersist() {

src/main/java/run/halo/app/model/params/MenuParam.java

@@ -1,7 +1,5 @@
 package run.halo.app.model.params;
 
-import run.halo.app.model.dto.base.InputConverter;
-import run.halo.app.model.entity.Menu;
 import lombok.Data;
 import lombok.ToString;
 import run.halo.app.model.dto.base.InputConverter;
@@ -37,4 +35,6 @@ public class MenuParam implements InputConverter<Menu> {
 
     @Size(max = 50, message = "Length of menu icon must not be more than {max}")
     private String icon;
+
+    private Integer parentId;
 }

src/main/java/run/halo/app/model/vo/MenuVO.java

@@ -0,0 +1,16 @@
+package run.halo.app.model.vo;
+
+import lombok.Data;
+import run.halo.app.model.dto.MenuOutputDTO;
+
+import java.util.List;
+
+/**
+ * @author : RYAN0UP
+ * @date : 2019-04-07
+ */
+@Data
+public class MenuVO extends MenuOutputDTO {
+
+    private List<MenuVO> children;
+}

src/main/java/run/halo/app/service/MenuService.java

@@ -1,11 +1,11 @@
 package run.halo.app.service;
 
+import org.springframework.data.domain.Sort;
+import org.springframework.lang.NonNull;
 import run.halo.app.model.dto.MenuOutputDTO;
 import run.halo.app.model.entity.Menu;
 import run.halo.app.model.params.MenuParam;
-import run.halo.app.service.base.CrudService;
-import org.springframework.data.domain.Sort;
-import org.springframework.lang.NonNull;
+import run.halo.app.model.vo.MenuVO;
 import run.halo.app.service.base.CrudService;
 
 import java.util.List;
@@ -14,6 +14,7 @@ import java.util.List;
  * Menu service.
  *
  * @author johnniang
+ * @author RYAN0UP
  */
 public interface MenuService extends CrudService<Menu, Integer> {
 
@@ -34,4 +35,12 @@ public interface MenuService extends CrudService<Menu, Integer> {
      */
     @NonNull
     Menu createBy(@NonNull MenuParam menuParam);
+
+    /**
+     * Lists as menu tree.
+     *
+     * @param sort sort info must not be null
+     * @return a menu tree
+     */
+    List<MenuVO> listAsTree(Sort sort);
 }

src/main/java/run/halo/app/service/impl/MenuServiceImpl.java

@@ -1,21 +1,21 @@
 package run.halo.app.service.impl;
 
-import run.halo.app.exception.AlreadyExistsException;
-import run.halo.app.model.dto.MenuOutputDTO;
-import run.halo.app.model.entity.Menu;
-import run.halo.app.model.params.MenuParam;
-import run.halo.app.repository.MenuRepository;
-import run.halo.app.service.MenuService;
-import run.halo.app.service.base.AbstractCrudService;
 import org.springframework.data.domain.Sort;
+import org.springframework.lang.NonNull;
 import org.springframework.stereotype.Service;
 import org.springframework.util.Assert;
 import org.springframework.util.CollectionUtils;
 import run.halo.app.exception.AlreadyExistsException;
+import run.halo.app.model.dto.MenuOutputDTO;
+import run.halo.app.model.entity.Menu;
+import run.halo.app.model.params.MenuParam;
+import run.halo.app.model.vo.MenuVO;
 import run.halo.app.repository.MenuRepository;
+import run.halo.app.service.MenuService;
 import run.halo.app.service.base.AbstractCrudService;
 
 import java.util.Collections;
+import java.util.LinkedList;
 import java.util.List;
 import java.util.stream.Collectors;
 
@@ -57,6 +57,87 @@ public class MenuServiceImpl extends AbstractCrudService<Menu, Integer> implemen
         return create(menuParam.convertTo());
     }
 
+    /**
+     * Lists as menu tree.
+     *
+     * @param sort sort info must not be null
+     * @return a menu tree
+     */
+    @Override
+    public List<MenuVO> listAsTree(Sort sort) {
+        Assert.notNull(sort, "Sort info must not be null");
+
+        // List all menu
+        List<Menu> menus = listAll(sort);
+
+        if (CollectionUtils.isEmpty(menus)) {
+            return Collections.emptyList();
+        }
+
+        // Create top menu
+        MenuVO topLevelMenu = createTopLevelMenu();
+
+        // Concrete the tree
+        concreteTree(topLevelMenu, menus);
+
+        return topLevelMenu.getChildren();
+    }
+
+    /**
+     * Concrete menu tree.
+     *
+     * @param parentMenu parent menu vo must not be null
+     * @param menus     a list of menu
+     */
+    private void concreteTree(MenuVO parentMenu, List<Menu> menus) {
+        Assert.notNull(parentMenu, "Parent menu must not be null");
+
+        if (CollectionUtils.isEmpty(menus)) {
+            return;
+        }
+
+        // Create children container for removing after
+        List<Menu> children = new LinkedList<>();
+
+        menus.forEach(menu -> {
+            if (parentMenu.getId().equals(menu.getParentId())) {
+                // Save child menu
+                children.add(menu);
+
+                // Convert to child menu vo
+                MenuVO child = new MenuVO().convertFrom(menu);
+
+                // Init children if absent
+                if (parentMenu.getChildren() == null) {
+                    parentMenu.setChildren(new LinkedList<>());
+                }
+                parentMenu.getChildren().add(child);
+            }
+        });
+
+        // Remove all child menus
+        menus.removeAll(children);
+
+        // Foreach children vos
+        if (!CollectionUtils.isEmpty(parentMenu.getChildren())) {
+            parentMenu.getChildren().forEach(childMenu -> concreteTree(childMenu, menus));
+        }
+    }
+
+    /**
+     * Creates a top level menu.
+     *
+     * @return top level menu with id 0
+     */
+    @NonNull
+    private MenuVO createTopLevelMenu() {
+        MenuVO topMenu = new MenuVO();
+        // Set default value
+        topMenu.setId(0);
+        topMenu.setChildren(new LinkedList<>());
+        topMenu.setParentId(-1);
+        return topMenu;
+    }
 
     private List<MenuOutputDTO> convertTo(List<Menu> menus) {
         if (CollectionUtils.isEmpty(menus)) {

src/main/java/run/halo/app/web/controller/admin/api/MenuController.java

@@ -1,19 +1,19 @@
 package run.halo.app.web.controller.admin.api;
 
-import run.halo.app.model.dto.MenuOutputDTO;
-import run.halo.app.model.entity.Menu;
-import run.halo.app.model.params.MenuParam;
-import run.halo.app.service.MenuService;
 import io.swagger.annotations.ApiOperation;
 import org.springframework.data.domain.Sort;
 import org.springframework.data.web.SortDefault;
 import org.springframework.web.bind.annotation.*;
+import run.halo.app.model.dto.MenuOutputDTO;
 import run.halo.app.model.entity.Menu;
+import run.halo.app.model.params.MenuParam;
+import run.halo.app.model.vo.MenuVO;
 import run.halo.app.service.MenuService;
 
 import javax.validation.Valid;
 import java.util.List;
 
+import static org.springframework.data.domain.Sort.Direction.ASC;
 import static org.springframework.data.domain.Sort.Direction.DESC;
 
 /**
@@ -38,6 +38,12 @@ public class MenuController {
         return menuService.listDtos(sort);
     }
 
+    @GetMapping("tree_view")
+    @ApiOperation("List as category tree")
+    public List<MenuVO> listAsTree(@SortDefault(sort = "name", direction = ASC) Sort sort) {
+        return menuService.listAsTree(sort);
+    }
+
     @PostMapping
     @ApiOperation("Creates a menu")
     public MenuOutputDTO createBy(@RequestBody @Valid MenuParam menuParam) {