public class User { private int id; private String name; private int age; private String address; private String phone; //set and get}
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controller
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层：
UserController.java
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:
@RestControllerpublic class UserController { @Autowired private UserService userService; private Logger logger = LoggerFactory.getLogger(this.getClass()); @RequestMapping(value = "/queryUserList",method = RequestMethod.GET,produces="application/json;charset=UTF-8") @ResponseBody public String queryLearnList(HttpServletRequest request , HttpServletResponse response){ String name = request.getParameter("name"); String phone = request.getParameter("phone"); Map params = new HashMap(); params.put("name", name); params.put("phone", phone); List userList =userService.queryUserList(params); return JSONArray.fromObject(userList).toString(); }
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service
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层：接口
UserService.java
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和实现类
UserServiceImpl.java
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public interface UserService { List queryUserList(Map params);}
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@Servicepublic class UserServiceImpl implements UserService { @Autowired UserDao userDao; @Override public List queryUserList(Map params) { return userDao.queryUserList(params); }}
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dao
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层：接口
UserDao.java
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和实现类
UserDaoImpl.java
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public interface UserDao { public List queryUserList(Map params);}
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UserDaoImpl .java
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注入
JdbcTemplate
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，spring boot会自动选择我们配置好的数据源:
@Repositorypublic class UserDaoImpl implements UserDao{ @Autowired private JdbcTemplate jdbcTemplate;//这里直接引用即可 @Override public List queryUserList(Map params) { StringBuffer sql =new StringBuffer(); sql.append("select * from user where 1=1"); if(!StringUtil.isNull((String)params.get("name"))){ sql.append(" and name like '%").append((String)params.get("name")).append("%'"); } if(!StringUtil.isNull((String)params.get("phone"))){ sql.append(" and phone like '%").append((String)params.get("phone")).append("%'"); } List list = jdbcTemplate.query(sql.toString(),new BeanPropertyRowMapper(User.class)); return list; }}
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[h2]结果[/h2]
运行项目，浏览器输入：
http://localhost:8080/queryUserList
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，得到如下结果
1.png
[h2]总结[/h2]
在此实践过程可能会出现以下问题：第一个错误
报错信息
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:
1.png
原因
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：项目打了jar包，一旦运行就会有两个启动类，指定其中一个即可
解决办法
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：在pom.xml的plugin下面添加如下配置即可
com.mlin.ChapterApplication
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第二个错误
报错信息：
java.sql.SQLException: The server time zone value 'ú±ê×±' is unrecognized or represents more than one time zone. You must configure either the server or JDBC driver (via the serverTimezone configuration property) to use a more specifc time zone value if you want to utilize time zone support.
转播
