public class Student {
private String name;
private int age;
引入js库，创建前端index.jsp
最后创建controller的类，负责请求的处理和响应
@Controller
public class AjaxAction {
//处理ajax请求,一定要加@ResponseBody
@ResponseBody
@RequestMapping("/ajax")
public List ajax(){
Student stu1 = new Student("张三",22);
Student stu2 = new Student("李四",24);
Student stu3 = new Student("王五",23);
List list = new ArrayList<>();
list.add(stu1);
list.add(stu2);
list.add(stu3);
//调用json转换工具ObjectMapper进行转换
return list; //===>springmvc负责转换成json
}
public interface UserMapper {
List selectUserPage(
@Param("userName")
String userName,
@Param("userSex")
String userSex,
@Param("startRow") //算好的起始行的值
int startRow);
int createUser(User user);
int deleteUserById(String userId);
int getRowCount(
@Param("userName")
String userName,
@Param("userSex")
String userSex);
}
新建UserMapper.xml实现增删查所有功能
user_id,card_type,card_no,user_name,user_sex,user_age,user_role
insert into user values(#{userId},#{cardType},#{cardNo},#{userName},#{userSex},#{userAge},#{userRole})
delete from user where user_id = #{userId}
新建service接口和实现类
public interface UserService {
/**
* url /user/selectUserPage?userName=z&userSex=男&page=null
*/
List selectUserPage(String userName,String userSex,int startRow);
/**
* /user/createUser(参数见下面)
*/
int createUser(User user);
/**
* user/ deleteUserById?userId= 15968162087363060
*/
int deleteUserById(String userId);
/**
* /user/getRowCount?userName=z&userSex=男
*/
int getRowCount(String userName,String userSex);
@Service
public class UserServiceImpl implements UserService {
//切记切记:一定会有数据访问层的对象
@Autowired
UserMapper userMapper;
@Override
public List selectUserPage(String userName, String userSex, int startRow) {
return userMapper.selectUserPage(userName,userSex,startRow);
}
@Override
public int createUser(User user) {
return userMapper.createUser(user);
}
@Override
public int deleteUserById(String userId) {
return userMapper.deleteUserById(userId);
}
@Override
public int getRowCount(String userName, String userSex) {
return userMapper.getRowCount(userName,userSex);
}
新建测试类,完成所有功能的测试
//@RunWith 就是一个运行器，@RunWith(SpringJUnit4ClassRunner.class),让测试运行于Spring测试环境， @ContextConfiguration这个注解通常与@RunWith(SpringJUnit4ClassRunner.class)联合使用用来测试
@RunWith(SpringJUnit4ClassRunner.class) //启动spring容器，
@ContextConfiguration(locations = {"classpath:applicationContext_mapper.xml","classpath:applicationContext_service.xml"})
public class MyTest {
@Autowired
UserService userService;
@Test
public void testSelectUserPage(){
List list = userService.selectUserPage("三","男",0);
list.forEach(user -> System.out.println(user));
}
@Test
public void testDeleteUserById(){
int num = userService.deleteUserById("15968162087363060");
System.out.println(num);
}
@Test
public void testGetRowCount(){
int num = userService.getRowCount(null,"男");
System.out.println(num);
}
@Test
public void testCreateUser(){
User u = new User("125412145214547846","身份证","121451245784","哈哈","男","23","工人");
int num = userService.createUser(u);
System.out.println("-----"+num);
}
新建控制器,完成所有功能
@CrossOrigin //在服务器端支持跨域访问
@RestController //如果本类中全部都是ajax请求,则使用此注解,方法上的@ResponseBody可不写
@RequestMapping("/user")
public class UserController {
//切记切记:一定会有业务逻辑层的对象
@Autowired
UserService userService;
public static final int PAGE_SIZE = 5;
//user/selectUserPage?userName=z&userSex=男&page=null
@RequestMapping("/selectUserPage")
public List selectUserPage(String userName,String userSex,Integer page){
//根据页码计算起始行
int startRow = 0;
if(page != null){
startRow = (page-1) * PAGE_SIZE;
}
return userService.selectUserPage(userName,userSex,startRow);
}
///user/getRowCount?userName=z&userSex=男
@RequestMapping("/getRowCount")
public int getRowCount(String userName,String userSex){
return userService.getRowCount(userName,userSex);
}
///user/deleteUserById?userId= 15968162087363060
@RequestMapping("/deleteUserById")
public int deleteUserById(String userId){
return userService.deleteUserById(userId);
}
///user/createUser(参数见下面)
@RequestMapping("/createUser")
public int createUser(User user){
String userId = System.currentTimeMillis()+"";
user.setUserId(userId);
return userService.createUser(user);
}
}
在系统运行后，在线程快照里总是看到线程池的名字为pool-xx，这样导致很不好定位，怎么给线程池一个有意义的名字呢。参照ThreadPoolExecutor类的ThreadFactory，自己实现ThreadFactory接口，重写newThread方法即可。参考代码如下：
public class Named
错误： IE 中"HTML Parsing Error:Unable to modify the parent container element before the child element is closed"
现象： 同事之间几个IE 测试情况下，有的报这个错，有的不报。经查询资料后，可归纳以下原因。
PropertyPlaceholderConfigurer是个bean工厂后置处理器的实现，也就是BeanFactoryPostProcessor接口的一个实现。关于BeanFactoryPostProcessor和BeanPostProcessor类似。我会在其他地方介绍。PropertyPlaceholderConfigurer可以将上下文（配置文件）中的属性值放在另一个单独的标准java P
创建一个类
public class ContextInitListener implements ServletContextListener
使得该类成为一个监听器。用于监听整个容器生命周期的，主要是初始化和销毁的。
类创建后要在web.xml配置文件中增加一个简单的监听器配置，即刚才我们定义的类。
<listener>
<des
http://developer.apple.com/iphone/library/qa/qa2009/qa1649.html
Excerpt:
You are getting this warning because you probably added your Info.plist file to your Copy Bundle
hi，
自己在做工程的时候，遇到批量插入数据的数据修复场景。我的思路是在插入前准备一个临时表，临时表的整理就看当时的选择条件了，临时表就是要插入的数据集，最后再批量插入到数据库中。
WITH tempT AS (
SELECT
item_id AS combo_id,
item_id,
now() AS create_date
FROM
a
