SSH 在页面实现部门树结构

一、如图：

二、创建部门类：

public class Department {    private Long id;    private Set<User> users = new HashSet<User>();    private Department parent;    private Set<Department> children = new HashSet<Department>();    private String name;    private String description;    public Long getId() {        return id;    }    public void setId(Long id) {        this.id = id;    }    public Set<User> getUsers() {        return users;    }    public void setUsers(Set<User> users) {        this.users = users;    }    public Department getParent() {        return parent;    }    public void setParent(Department parent) {        this.parent = parent;    }    public Set<Department> getChildren() {        return children;    }    public void setChildren(Set<Department> children) {        this.children = children;    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public String getDescription() {        return description;    }    public void setDescription(String description) {        this.description = description;    }}

三、创建部门action:

@Controller@Scope("prototype")public class DepartmentAction extends BaseAction<Department> {    private static final long serialVersionUID = 5242842204530086588L;    private Long parentId;    public String list() throws Exception {        //List<Department> departmentList = departmentService.findAll();        List<Department> departmentList = null;        if (parentId == null) {            departmentList = departmentService.findTopList();        }else {            departmentList = departmentService.findChildList(parentId);            //返回上一级所使用的            Department parent = departmentService.getById(parentId);            ActionContext.getContext().put("parent", parent);        }        ActionContext.getContext().put("departmentList", departmentList);        return "list";    }    //// 准备数据：departmentList，显示为树状结构    public String addUI() throws Exception {        // 回显数据        List<Department> departmentList = DepartmentUtil.getAllDepartments(departmentService.findTopList());        ActionContext.getContext().put("departmentList", departmentList);        return "saveUI";    }    public String add() throws Exception {        if (parentId != null) {            Department parent = departmentService.getById(parentId);            model.setParent(parent);        }        departmentService.add(model);        return "toList";    }    public String delete() throws Exception {        departmentService.delete(model.getId());        return "toList";    }    public String editUI() throws Exception {        // 回显数据        //List<Department> departmentList = departmentService.findAll();        List<Department> departmentList = DepartmentUtil.getAllDepartments(departmentService.findTopList());        ActionContext.getContext().put("departmentList", departmentList);        Department department = departmentService.getById(model.getId());        ActionContext.getContext().getValueStack().push(department);        //回显上级部门        if (department.getParent() != null) {            parentId = department.getParent().getId();        }        return "saveUI";    }    public String edit() throws Exception {        // 1.获得实体        Department department = departmentService.getById(model.getId());        // 2.设值        department.setName(model.getName());        department.setDescription(model.getDescription());        //3.设置上级部门        Department parent = departmentService.getById(parentId);        department.setParent(parent);        // 4.更新        departmentService.update(department);        return "toList";    }    @Override    public Department getModel() {        return model;    }    public void setDepartment(Department department) {        this.model = department;    }    public Long getParentId() {        return parentId;    }    public void setParentId(Long parentId) {        this.parentId = parentId;    }}

四、创建部门树工具类：

public class DepartmentUtil {    public static List<Department> getAllDepartments(List<Department> topList){        List<Department> list = new ArrayList<Department>();        walkDepartmentTreeList(topList, " ├", list);        return list;    }    private static void walkDepartmentTreeList(Collection<Department> topList, String prifix, List<Department> list) {        for(Department department : topList){            Department copy = new Department();            if(department.getParent() == null)                copy.setName(department.getName());            else                 copy.setName(prifix + department.getName());            list.add(copy);            walkDepartmentTreeList(department.getChildren(), "　" + prifix, list);        }    }}

五、前端页面：

<table cellpadding="0" cellspacing="0" class="mainForm">                    <tr><td width="100">上级部门</td>                        <td><s:select list="#departmentList" cssClass="SelectStyle" name="parentId" listKey="id" listValue="name" headerKey="" headerValue="=请选择上级部门="></s:select>                        </td>                    </tr>                    <tr><td>部门名称</td>                        <td><s:textfield name="name" cssClass="InputStyle required" />  *</td>                    </tr>                    <tr><td>职能说明</td>                        <td><s:textarea name="description" cssClass="TextareaStyle"></s:textarea></td>                    </tr>                </table>

六、strust2配置:

<action name="*_*" class="{1}Action" method="{2}">            <result name="list">/WEB-INF/jsp/{1}/list.jsp</result>            <result name="saveUI">/WEB-INF/jsp/{1}/saveUI.jsp</result>            <result name="toList" type="redirectAction">{1}_list?parentId=${parentId}</result>        </action>

七、BaseAction代码：

@SuppressWarnings("all")public abstract class BaseAction<T> extends ActionSupport implements ModelDriven<T>{    protected T model;    @Resource    protected DepartmentService departmentService;    @Resource    protected RoleService roleService;    public BaseAction(){        ParameterizedType pt =  (ParameterizedType) this.getClass().getGenericSuperclass();        Class<T> clazz = (Class<T>) pt.getActualTypeArguments()[0];        try {            model = clazz.newInstance();        } catch (InstantiationException e) {            e.printStackTrace();        } catch (IllegalAccessException e) {            e.printStackTrace();        }    }    @Override    public T getModel() {        return model;    }}