spring mvc easyui tree 异步加载

<ul id="orgInfoTree"></ul>

$(function(){
loadOrgTree();
});

function loadOrgTree(){
$('#orgInfoTree').tree({
checkbox: true,
lines:true,
url: '<%=request.getContextPath()%>/FNCG_PD_QRY/loadOrgTree', 这是第一次加载树的url 加载根节点
onBeforeExpand:function(node){
$("#orgInfoTree").tree('options').url='<%=request.getContextPath()%>/FNCG_PD_QRY/loadOrgChildrenTree?FID='+node.id; 这是点击根节点的时候发送请求去加载子节点
},
onClick:function(node){
$("#orgInfoTree").tree('options').url='<%=request.getContextPath()%>/FNCG_PD_QRY/loadOrgChildrenTree?FID='+node.id;
}
});
}

@RequestMapping("/loadOrgTree")
@ResponseBody
public String loadOrgTree(){
List<OrgTree> OTList = fncg_PD_QRY_Service.loadOrgTree();
StringBuffer sb = new StringBuffer();
sb.append("[");
for (OrgTree orgTree : OTList) {
sb.append("{\"id\":" + orgTree.getORGN_CODE() + " ,\"text\":" + "\""
+ orgTree.getORGN_NAME() + "\"" + " ,\"state\":"
+ " \"closed\" " + " ,\"attributes\":" + "\""
+ orgTree.getORGN_LVL() + "\"" + "},");
}
sb.deleteCharAt(sb.length() - 1);
sb.append("]");
return sb.toString();
}

@RequestMapping("/loadOrgChildrenTree")
@ResponseBody
public String loadOrgChildrenTree(String FID){
List<OrgTree> OTList = fncg_PD_QRY_Service.loadOrgChildrenTree(FID);
StringBuffer sb = new StringBuffer();
sb.append("[");
for (OrgTree orgTree : OTList) {
sb.append("{\"id\":" + orgTree.getORGN_CODE() + " ,\"text\":" + "\""
+ orgTree.getORGN_NAME() + "\"" + " ,\"state\":"
+ " \"closed\" " + " ,\"attributes\":" + "\""
+ orgTree.getORGN_LVL() + "\"" + "},");
}
sb.deleteCharAt(sb.length() - 1);
sb.append("]");
return sb.toString();
}

public List<OrgTree> loadOrgTree(){
return fncg_PD_QRY_Dao.loadOrgTree();
}

public List<OrgTree> loadOrgChildrenTree(String FID){
return fncg_PD_QRY_Dao.loadOrgChildrenTree(FID);
}

public List<OrgTree> loadOrgTree();

public List<OrgTree> loadOrgChildrenTree(@Param("FID") String FID);

<select id="loadOrgTree" resultMap="com.cvicin.products.productManage.fngg.mapper.poRes.OrgTree">
SELECT B.ID AS ID,B.ORGN_CODE AS ORGN_CODE,B.F_ORGN_ID AS F_ORGN_ID,B.ORGN_NAME AS ORGN_NAME,B.ORGN_LVL AS ORGN_LVL FROM ORGN_BASIC B WHERE B.ORGN_LVL = (SELECT min(A.ORGN_LVL) FROM ORGN_BASIC A)
</select>

<select id="loadOrgChildrenTree" parameterType="java.lang.String" resultMap="com.cvicin.products.productManage.fngg.mapper.poRes.OrgTree">
SELECT B.ID AS ID,B.ORGN_CODE AS ORGN_CODE,B.F_ORGN_ID AS F_ORGN_ID,B.ORGN_NAME AS ORGN_NAME,B.ORGN_LVL AS ORGN_LVL FROM ORGN_BASIC B WHERE B.F_ORGN_ID = #{FID,jdbcType=VARCHAR}
</select>

public class OrgTree extends BasePO{

private int ID;
private String ORGN_CODE;
private String F_ORGN_ID;
private String ORGN_NAME;
private String ORGN_LVL;

public int getID() {
return ID;
}
public void setID(int iD) {
ID = iD;
}
public String getORGN_CODE() {
return ORGN_CODE;
}
public void setORGN_CODE(String oRGN_CODE) {
ORGN_CODE = oRGN_CODE;
}
public String getF_ORGN_ID() {
return F_ORGN_ID;
}
public void setF_ORGN_ID(String f_ORGN_ID) {
F_ORGN_ID = f_ORGN_ID;
}
public String getORGN_NAME() {
return ORGN_NAME;
}
public void setORGN_NAME(String oRGN_NAME) {
ORGN_NAME = oRGN_NAME;
}
public String getORGN_LVL() {
return ORGN_LVL;
}
public void setORGN_LVL(String oRGN_LVL) {
ORGN_LVL = oRGN_LVL;
}

}

<resultMap id="OrgTree" type="com.cvicin.products.productManage.OrgTree">
<result property="ID"		   column="ID" />
<result property="ORGN_CODE"	   column="ORGN_CODE" />
<result property="F_ORGN_ID"	   column="F_ORGN_ID" />
<result property="ORGN_NAME"	   column="ORGN_NAME" />
<result property="ORGN_LVL"	    column="ORGN_LVL" />
</resultMap>