SpringMVC项目实例代码（基础版），执行流程和三层架构类的代码
1.调用WEB-INF里面的index.jsp
在得到配置后这个java代码可以直接得到浏览器发来的请求"system"
package com.dmc.controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
@Controller
public class IndexConrtoller {
//java代码可以直接接收浏览器的请求，在得到注解后
@RequestMapping("/system")//接收来自浏览器的直接访问
//去后台首页
public String goIndex(){
return "WEB-INF/system/index";//跳转到这个jsp页面，这个字符串经过视图解析器，自动变成jsp的全名直接访问jsp文件
}
}
2.发送请求
代码中有一个src=“system/jobs/show” 用来发送请求
<body>
<div class="container-fluid" style="margin-top: 60px;">
<div class="row">
<!-- 内容展示页 -->
<div class="main_page"> <!-- 加载本jsp文件后自动发送这个请求 -->
<iframe scrolling="no" id="mainContent" name="mainContent" src="system/jobs/show" frameborder="0" src="" style="min-height:600px;width:100%;height:100%;"></iframe>
</div> <!-- 加载本jsp文件后自动发送这个请求 -->
</div>
</div>
</body>
3.接收请求并处理
上面传的请求到这里的就是"system/jobs/show" ，代码匹配到相应的请求之后做相应的逻辑处理：调用goIndex()方法
package com.dmc.controller;
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.RequestMapping;
import com.dmc.domain.Jobs;
import com.dmc.service.SystemIJobsService;
@Controller
@RequestMapping("/system/jobs")
public class SystemJobsController {
@Autowired
public SystemIJobsService service;
@RequestMapping("/show")//到这里的就是请求"system/jobs/show"
public String goIndex(Model mo){
List<Jobs> jobs = service.findAll();
mo.addAttribute("jobs", jobs);
return "WEB-INF/system/jobs";//跳转到这个jsp页面
}
@RequestMapping("/del")//到这里的就是请求"system/jobs/del"
public String delete(Integer id){
service.delete(id);
return "redirect:show";//跳转到这个jsp页面
}
}
4.上一个代码在完成逻辑处理后发送请求"WEB-INF/system/jobs"经过视图解析器后变成"/WEB-INF/system/jobs.jsp"，绑定值、传递值后直接访问这个jsp页面
#${ j.id }
${ j.title }
${ j.address }
${ j.jobnum }
${ j.treatment }
[${ j.inputdate }]
5. 步骤3的逻辑处理List jobs = service.findAll();
逻辑处理是就要注意些注解了，注解写在实现类和controller类里面，接口不写注解。
自动注入的注解写在如下形式代码
@Repository
public class SystemJobsDaoImpl implements SystemIJobsDao{
@Autowired
public JdbcTemplate temple;
@Override
public List<Jobs> findAll() {
return temple.query("select * from jobs", new BeanPropertyRowMapper<Jobs>(Jobs.class));
}
@Override
public void delete(Integer id) {
temple.update("delete from jobs where id = ? " , id);
}
}
6.步骤3的绑定值mo.addAttribute(“jobs”, jobs);
获取方式
#${ j.id }
${ j.title }
${ j.address }
${ j.jobnum }
${ j.treatment }
7.三层架构中的代码
1.controller层
package com.dmc.controller;
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.RequestMapping;
import com.dmc.domain.Citys;
import com.dmc.domain.Jobs;
import com.dmc.service.SystemICityService;
import com.dmc.service.SystemIJobsService;
import com.dmc.util.PageBean;
@Controller
@RequestMapping("/system/jobs")
public class SystemJobsController {
@Autowired
public SystemIJobsService service;
@Autowired
public SystemICityService cityService;
@RequestMapping("/show")
public String goIndex(Integer localPage , Model mo){
//List jobs = service.findAll();
PageBean<Jobs> pageBean = service.page(localPage);
mo.addAttribute("pageBean", pageBean);
return "WEB-INF/system/jobs";//跳转到这个jsp页面
}
@RequestMapping("/del")
public String delete(Integer id){
service.delete(id);
return "redirect:show";//跳转到这个jsp页面
}
//city的方法调用
@RequestMapping("/toAdd")
public String toAdd(Model mo){
List<Citys> citys = cityService.findAll();
mo.addAttribute("citys",citys);
return "WEB-INF/system/jobs_add";
}
//调用jobs方法
@RequestMapping("/add")
public String add(Jobs j){
service.add(j);
return "redirect:show";//跳转到这个jsp页面
}
@RequestMapping("/update1")
public String update1(Integer id , Model mo){
//这里把单个查询设定成了update
Jobs j = service.update1(id);//调用的是单个查询的功能，但写成了update
mo.addAttribute("job1",j);
List<Citys> citys = cityService.findAll();
mo.addAttribute("citys",citys);
return "WEB-INF/system/jobs_edit";//跳转到这个jsp页面
}
@RequestMapping("/update2")
public String update2(Jobs job){
System.out.println(job);
service.updateGo(job);
return "redirect:show";//跳转到这个jsp页面
}
}
2.service层实现类
package com.dmc.service.impl;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import com.dmc.dao.SystemIJobsDao;
import com.dmc.domain.Jobs;
import com.dmc.service.SystemIJobsService;
import com.dmc.util.PageBean;
@Service
public class SystemJobsServiceImpl implements SystemIJobsService{
@Autowired
public SystemIJobsDao dao;
@Override
public List<Jobs> findAll() {
return dao.findAll();
}
@Override
public void delete(Integer id) {
dao.delete(id);
}
@Override
public void add(Jobs j) {
dao.add(j);
}
@Override
public Jobs update1(Integer id) {
return dao.update1(id);
}
@Override
public void updateGo(Jobs job) {
dao.updateGo(job);
}
@Override
public PageBean<Jobs> page(Integer localPage) {
Integer totalNum = dao.findTotalNum();
if(localPage == null){
localPage = 1;
}
PageBean<Jobs> pageBean = new PageBean<>(localPage,totalNum);
List<Jobs> l = dao.findList((pageBean.getLocalPage()-1)*pageBean.getPageSize(),pageBean.getPageSize());
pageBean.setList(l);
return pageBean;
}
}
3.dao层实现类
package com.dmc.dao.impl;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.stereotype.Repository;
import com.dmc.dao.SystemIJobsDao;
import com.dmc.domain.Jobs;
@Repository
public class SystemJobsDaoImpl implements SystemIJobsDao{
@Autowired
public JdbcTemplate temple;
@Override
public List<Jobs> findAll() {
return temple.query("select * from view_jobs_citys", new BeanPropertyRowMapper<Jobs>(Jobs.class));
}
@Override
public void delete(Integer id) {
temple.update("delete from jobs where id = ? " , id);
}
@Override
public void add(Jobs j) {
String sql = "insert into jobs(title,cid,jobnum,treatment,describes,requires,htmlurl,positiontype,isenabled,inputdate) values(?,?,?,?,?,?,?,?,?,?)";
temple.update(sql,j.getTitle(),j.getCid(),j.getJobnum(),j.getTreatment(),j.getDescribes(),j.getRequires(),j.getHtmlurl(),j.getPositiontype(),j.getIsenabled(),j.getInputdate());
}
//这里是单个查询，写成了update
@Override
public Jobs update1(Integer id) {
return temple.queryForObject("select * from jobs where id = ?", new BeanPropertyRowMapper<Jobs>(Jobs.class),id);
}
@Override
public void updateGo(Jobs jobs) {
String sql="update jobs set title=? ,cid = ?,jobnum = ?, treatment=?,describes=?,requires=?,htmlurl=?,positiontype=?,isenabled=?,inputdate=? where id = ?";
temple.update(sql, jobs.getTitle(),jobs.getCid(),jobs.getJobnum(),jobs.getTreatment(),jobs.getDescribes(),jobs.getRequires(),jobs.getHtmlurl(),jobs.getPositiontype(),jobs.getIsenabled(),jobs.getInputdate(),jobs.getId());
}
@Override
public Integer findTotalNum() {
Integer totalNum = temple.queryForObject("select count(id) from jobs", Integer.class);
return totalNum;
}
@Override
public List<Jobs> findList(int i, Integer pageSize) {
return temple.query("select * from jobs limit ? , ? ", new BeanPropertyRowMapper<Jobs>(Jobs.class) , i , pageSize);
}
}