struts2中实现一个TreeView功能

Question

数据库是sql server 
4个表是：公司，部门，小组，员工公司是根节点，然后是部门，小组，最后是员工
每个节点前有单选框这样的功能在struts2中怎么实现？
最好给一个例子

Answer 1

老大，您这是在出考试题么？
光使用Struts2不够吧？贴个用JDBC的例子：
Dao层：
//完成树型结构的递归读取
public class ClientTreeReader {
private StringBuffer sbTreeHTML = new StringBuffer();
//返回HTML字符串
public String getClientTreeHTMLString() {
Connection conn = null;
try {
conn = DbUtil.getConnection();
readClientTree(conn, 0, 0);
} catch (Exception e) {
e.printStackTrace();
} finally {
DbUtil.close(conn);
}
return sbTreeHTML.toString();
} //递归读取分销商树
private void readClientTree(Connection conn, int id, int level)throws SQLException {
String sql = "select * from t_client where pid=?";
PreparedStatement pstmt = null;
ResultSet rs = null;
try {
pstmt = conn.prepareStatement(sql);
pstmt.setInt(1, id);
rs = pstmt.executeQuery();
while (rs.next()) {
sbTreeHTML.append(rs.getString("name"))
.append("<br>\n");
if ("N".equals(rs.getString("is_leaf"))) {
readClientTree(conn, rs.getInt("id"), level);
}
}
} finally {
DbUtil.close(rs);
DbUtil.close(pstmt);
}
} //递归读取分销商树
//采用div生成树形结构
private void readClientTree(Connection conn, int id, int level)
throws SQLException {
String sql = "select * from t_client where pid=?";
PreparedStatement pstmt = null;
ResultSet rs = null;
try {
pstmt = conn.prepareStatement(sql);
pstmt.setInt(1, id);
rs = pstmt.executeQuery();
while (rs.next()) {
sbTreeHTML.append("<div>");
sbTreeHTML.append("\n");
for (int i = 0; i < level; i++) {
sbTreeHTML.append("<img src=\"../images/white.gif\">");
sbTreeHTML.append("\n");
}
// if ("N".equals(rs.getString("is_leaf"))) {
if (Constants.NO.equals(rs.getString("is_leaf"))) {
sbTreeHTML
.append("<img alt=\"展开\" style=\"cursor:hand;\" onClick=\"display('"
+ rs.getInt("id")
+ "');\" id=\"img"
+ rs.getInt("id")
+ "\" src=\"../images/plus.gif\">");
sbTreeHTML.append("\n");
sbTreeHTML.append("<img id=\"im" + rs.getInt("id")
+ "\" src=\"../images/closedfold.gif\">");
sbTreeHTML.append("\n");
sbTreeHTML.append("<a href=\"client_node_crud.jsp?id="
+ rs.getInt("id")
+ "\" target=\"clientDispAreaFrame\">"
+ rs.getString("name") + "</a>");
sbTreeHTML.append("\n");
sbTreeHTML.append("<div style=\"display:none;\" id=\"div"
+ rs.getInt("id") + "\">");
sbTreeHTML.append("\n");
readClientTree(conn, rs.getInt("id"), level + 1);
sbTreeHTML.append("</div>");
sbTreeHTML.append("\n");
} else {
sbTreeHTML.append("<img src=\"../images/minus.gif\">");
sbTreeHTML.append("\n");
sbTreeHTML.append("<img src=\"../images/openfold.gif\">");
sbTreeHTML.append("\n");
// if ("Y1".equals(rs.getString("is_client"))) {
if (Constants.YES.equals(rs.getString("is_client"))) {
sbTreeHTML.append("<a href=\"client_crud.jsp?id="
+ rs.getInt("id")
+ "\" target=\"clientDispAreaFrame\">"
+ rs.getString("name") + "</a>");
} else {
sbTreeHTML.append("<a href=\"client_node_crud.jsp?id="
+ rs.getInt("id")
+ "\" target=\"clientDispAreaFrame\">"
+ rs.getString("name") + "</a>");
}
sbTreeHTML.append("\n");
}
sbTreeHTML.append("</div>");
sbTreeHTML.append("\n");
}
} finally {
DbUtil.close(rs);
DbUtil.close(pstmt);
}
}
}

Answer 2

在CSDN上发帖太少……刚才的代码要调整下……但修改不了啊
刚才的例子我好好修改修改再贴上来。

Answer 3

Struts2动态树型从数据库取出 
后台数据层代码:public TEquipmentTree[] getChildren(String treeNodeId) throws Exception {
  Connection conn = getConnection();
  PreparedStatement smt = conn.prepareStatement("select * from t_equipmentclass where eql_pcode ='"+treeNodeId+"'");
  
  ResultSet rs = smt.executeQuery();
  List<TEquipmentTree> childList = new ArrayList<TEquipmentTree>();
  while (rs.next()) {
   TEquipmentTree TEquipmentTree = new TEquipmentTree();
   TEquipmentTree.setEqlCode(rs.getString("eql_code"));
   TEquipmentTree.setEqlName(rs.getString("eql_name"));
   TEquipmentTree.setEqlPcode(rs.getString("eql_pcode"));
   TEquipmentTree.setEqlLevel(rs.getInt("eql_level"));
   TEquipmentTree.setEqlRe(rs.getString("eql_re"));
   TEquipmentTree.setChildEquipment(getChildren(TEquipmentTree.getEqlCode()));
   childList.add(TEquipmentTree);
  }
  rs.close();
  smt.close();
  conn.close();
  TEquipmentTree[] childResult = new TEquipmentTree[childList.size()];
  childResult = childList.toArray(childResult);
  return childResult;
 }public TEquipmentTree[] getAllTEquipmentTree() throws Exception {
  String sql="select * from T_Equipmentclass where EQL_PCODE='EEW1001'";
  Connection conn = getConnection();
  PreparedStatement smt = conn.prepareStatement(sql);
  ResultSet rs = smt.executeQuery();
  List<TEquipmentTree> TEquipmentTreeList = new ArrayList<TEquipmentTree>();
  while (rs.next()) {
   TEquipmentTree TEquipmentTree = new TEquipmentTree();
   TEquipmentTree.setEqlCode(rs.getString("EQL_CODE"));
   TEquipmentTree.setEqlName(rs.getString("EQL_NAME"));
   TEquipmentTree.setEqlPcode(rs.getString("EQL_PCODE"));
   TEquipmentTree.setEqlLevel(rs.getInt("EQL_LEVEL"));
   TEquipmentTree.setEqlRe(rs.getString("EQL_REMARK"));
   TEquipmentTree.setChildEquipment(getChildren(TEquipmentTree.getEqlCode()));
   TEquipmentTreeList.add(TEquipmentTree);  }
  rs.close();
  smt.close();
  conn.close();
  TEquipmentTree[] TEquipmentTree = new TEquipmentTree[TEquipmentTreeList.size()];
  TEquipmentTree = TEquipmentTreeList.toArray(TEquipmentTree);
  return TEquipmentTree;
 }前台页面:<s:head theme="ajax"/>
<script type="text/javascript">
function treeNodeSelected(arg) {
 window.returnValue=arg.source.title+","+arg.source.widgetId;
 window.close();
 //arg.source.widgetId+","
 //window.opener.document.getElementById("eqlCode").value=arg.source.widgetId;
 //alert(arg.source.title);
 //window.opener.document.getElementByName("eqlName").value=arg.source.title;
 //alert("id["+arg.source.widgetId+"], name["+ arg.source.title+ "] selected");
   }
   dojo.addOnLoad(function() {                
      var s = dojo.widget.byId('tree').selector;                
      dojo.event.connect(s, 'select', 'treeNodeSelected');
   });
</script>
</head>
<body>
<s:form>
 <s:tree id="tree" 
 rootNode="root"
 nodeIdProperty="eqlCode" 
 nodeTitleProperty="eqlName" 
 childCollectionProperty="childEquipment" 
 treeSelectedTopic="treeSelected" 
 theme="ajax" 
 showRootGrid="false">
 </s:tree>
</s:form>