ssm+mysql+easyui-tree省市区三级联动

package com.onu.controller.awave; import java.io.IOException; import java.util.List; import javax.annotation.Resource; import javax.servlet.http.HttpServletResponse; import net.sf.json.JSONArray; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.ResponseBody; import com.onu.entity.awave.Region; import com.onu.service.awave.RegionService; /** * 生成省市区三级菜单 * @author awave * */ @Controller @RequestMapping("/awave") public class RegionController { @Resource RegionService regionService; @RequestMapping("/getNodesById") public void getNodesById(Integer id,HttpServletResponse response) { System.out.println("kaishi"); String str = ""; StringBuilder json = new StringBuilder(); List<Region> treeRoot = regionService.FindProvince(); // 获得根节点 if (treeRoot != null && treeRoot.size() != 0) { json.append("["); for (Region a : treeRoot) { // 拼接根节点 json.append("{\"id\":" + String.valueOf(a.getId())); json.append(",\"text\":\"" + a.getRegionName() + "\""); // 获取根节点下的所有子节点 List<Region> treeList = regionService.FindCityOrDistrict(a.getId()); // 遍历子节点下的子节点 if (treeList != null && treeList.size() != 0) { json.append(",\"children\":["); for (Region t : treeList) { json.append("{\"id\":" + String.valueOf(t.getId())); json.append(",\"text\":\"" + t.getRegionName() + "\""); json.append(",\"state\":\"open\""); // 该节点有子节点 // 设置为关闭状态,而从构造异步加载tree List<Region> tList = regionService .FindCityOrDistrict(t.getId()); if (tList != null && tList.size() != 0) {// 存在子节点 json.append(",\"children\":["); for (Region c : tList) { json.append("{\"id\":" + String.valueOf(c.getId())); json.append(",\"text\":\""+ c.getRegionName() + "\""); json.append("}"); json.append(","); } json.deleteCharAt(json.length()-1); json.append("]"); } json.append("}"); json.append(","); } json.deleteCharAt(json.length()-1); json.append("]"); } json.append("}"); json.append(","); } json.deleteCharAt(json.length()-1); json.append("]"); str = json.toString(); try { System.out.println("输出json数据"+str); //解决中文response乱码 response.setHeader("Content-type", "text/html;charset=UTF-8"); //向客户端输出内容 response.getWriter().print(str); } catch (IOException e) { e.printStackTrace(); } } } @RequestMapping("/region_add") @ResponseBody public Object addRegion(Region region){ return regionService.addRegion(region); } @RequestMapping("/region_delete") @ResponseBody public Object deleteRegion(Integer id){ return regionService.deleteRegion(id); } }