ssm框架下实现省市县三级联动

运行效果：省份信息从数据库中自动遍历，单击省份下的江西，城市信息便自动从数据库中读出，单击城市中的九江，县城信息便从数据库中读出

数据库

jsp层：comovement.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%> 








    
        
           ------请选择省份-----
           
		${c1.pr_name}		
	    
       
       
           ------请选择城市-----
       
       
           ------请选择县城-----
       

控制层：ComovementController.java

import java.io.IOException;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;
import com.kebo.po.Comovement;
import com.kebo.service.ComovementService;

@Controller
public class ComovementController {
@Autowired
private ComovementService comovementService;
@RequestMapping("findProvince")
public String findProvince(Model model) {
	List province=comovementService.findProvince();
	model.addAttribute("province",province);
	return "comovement";
}
@RequestMapping(value="/testjson1/{pr_name}",method=RequestMethod.GET)
@ResponseBody
public Object testJson1( @PathVariable("pr_name") String pr_name,Model model) throws IOException{
	List city=comovementService.findCityByName(pr_name);
 return city;
}
@RequestMapping(value="/testjson2/{ci_name}",method=RequestMethod.GET)
@ResponseBody
public Object testJson2(@PathVariable("ci_name") String ci_name,Model model) throws IOException{
	List county=comovementService.findCountyByName(ci_name);
 return county;
}
}

Dao层:ComovementDao.java

import java.util.List;

import com.kebo.po.Comovement;

public interface ComovementDao {
public List findProvince();
public List findCityByName(String pr_name);
public List findCountyByName(String ci_name);
}

ComovementDao.xml

    
    
        select distinct pr_name from province
    
    
    
        select distinct ci_name from city,province where ci_belong=pr_id and pr_name=#{pr_name}
    
    
    
        select distinct co_name from county,city where co_belong=ci_id and ci_name=#{ci_name}
    

Service层：ComovementService.java

import java.util.List;

import com.kebo.po.Comovement;

public interface ComovementService {
	public List findProvince();
	public List findCityByName(String pr_name);
	public List findCountyByName(String ci_name);
}

实现层：ComovementServiceImpl.java

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import com.kebo.dao.ComovementDao;
import com.kebo.po.Comovement;
import com.kebo.service.ComovementService;
@Service
@Transactional
public class ComovementServiceImpl implements ComovementService {
	@Autowired
private ComovementDao comovementDao;
	@Override
	public List findProvince() {
		return this.comovementDao.findProvince();
	}

	@Override
	public List findCityByName(String pr_name) {
		// TODO Auto-generated method stub
		return this.comovementDao.findCityByName(pr_name);
	}

	@Override
	public List findCountyByName(String ci_name) {
		// TODO Auto-generated method stub
		return this.comovementDao.findCountyByName(ci_name);
	}

}

po层：Comovement.java

public class Comovement {
private String pr_name;
private String ci_name;
private String co_name;
public String getPr_name() {
	return pr_name;
}
public void setPr_name(String pr_name) {
	this.pr_name = pr_name;
}
public String getCi_name() {
	return ci_name;
}
public void setCi_name(String ci_name) {
	this.ci_name = ci_name;
}
public String getCo_name() {
	return co_name;
}
public void setCo_name(String co_name) {
	this.co_name = co_name;
}

}

注意：ssm框架下springmvc的拦截器会把jq的配置文件给拦截掉，需要在spring-config.xml文件中

使静态文件不被拦截（例如），除此之外，ssm框架下实现此功能除了需要ssm框架本身的jar包之外，还需要导入json支持包，以及jstl.jar和standard.jar包用于遍历输出省级信息

这是整体的项目图：