标签：message pack package string png 监听器 create 行数据 路径
通过三天的时间,跟着视频学习然后做出来了
只是最基本的增删改查,学到了一些比较"小心机"的设计,期间出了不少问题让我一度想要放弃,重要的内容借此平台总结一下
web.xml，主要用于配置Filter，Servlet，Lisenter等
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" version="3.1"> <display-name>usermanage</display-name> <!-- 配置spring容器初始化监听器 --> <context-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:spring/applicationContext*.xml</param-value> </context-param> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> <!-- 配置编码的过滤器 --> <filter> <filter-name>encoding</filter-name> <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class> <init-param> <param-name>encoding</param-name> <param-value>utf8</param-value> </init-param> </filter> <filter-mapping> <filter-name>encoding</filter-name> <!--拦截路径 --> <url-pattern>/*</url-pattern> </filter-mapping> <!-- 配置DispatcherServlet --> <servlet> <servlet-name>usermanage</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:spring/usermanage-servlet.xml</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>usermanage</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> <welcome-file-list> <welcome-file>index.html</welcome-file> <welcome-file>index.htm</welcome-file> <welcome-file>index.jsp</welcome-file> <welcome-file>default.html</welcome-file> <welcome-file>default.htm</welcome-file> <welcome-file>default.jsp</welcome-file> </welcome-file-list> </web-app>
usermanage-servlet.xml，对应于Controller
主要步骤：配置注解驱动；开启注解扫描；解决静态资源的拦截问题；配置视图解析器
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p" xmlns:context="http://www.springframework.org/schema/context" xmlns:mvc="http://www.springframework.org/schema/mvc" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"> <mvc:view-controller path="/user/users" view-name="users"/> <mvc:view-controller path="/user/page/add" view-name="user-add"/> <mvc:view-controller path="/user/page/edit" view-name="user-edit"/> <!-- 配置注解驱动：替代推荐使用的注解映射器和适配器，提供对json的支持 --> <mvc:annotation-driven /> <!-- 开启注解扫描，和spring是一样的 --> <context:component-scan base-package="com.cn.usermanage.controller" /> <!-- 解决静态资源被拦截的问题 --> <mvc:default-servlet-handler/> <!-- 配置视图解析器 --> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix" value="/WEB-INF/views/"></property> <property name="suffix" value=".jsp"></property> </bean> </beans>
applicationContext.xml 中需要配置(省略数据库的配置文件)
<!-- 注解扫描 --> <context:component-scan base-package="com.cn.usermanage.service"/> <!-- 加载资源文件 --> <context:property-placeholder location="classpath:jdbc.properties"/> <!-- 配置数据源 --> <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"> <property name="user" value="${jdbc.user}" /> <property name="password" value="${jdbc.password}" /> <property name="jdbcUrl" value="${jdbc.url}" /> <property name="driverClass" value="${jdbc.driver}" /> </bean>
applicationContext-mybatis.xml中需要配置，和利用mybatis操作数据库相关
步骤：需要初始化SqlsessionFactory对象；配置Mapper接口的包扫描
<!-- spring初始化bean的方式： 1.无参构造 2.静态工厂方法 3.实例化工厂 4.工厂bean --> <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <!-- 指定数据源 --> <property name="dataSource" ref="dataSource" /> <!-- 指定全局配置文件 --> <property name="configLocation" value="classpath:mybatis/mybatis-config.xml"></property> <!-- 指定映射文件(不需要mybatis-config.xml中映射),利用通配符匹配任意目录任意xml配置 --> <property name="mapperLocations" value="classpath:mybatis/mappers/**/*.xml"></property> <!-- 开启别名扫描 --> <property name="typeAliasesPackage" value="com.cn.usermanage.pojo"></property> </bean> <!-- 配置mapper接口的包扫描 --> <mybatis-spring:scan base-package="com.cn.usermanage.mapper" />
mybatis-config.xml只需要配置行为参数即可
<settings> <setting name="mapUnderscoreToCamelCase" value="true" /> </settings>
实体类对象User可以通过注解的方式对属性进行数据校验,常用的注解如:
User.java
public class User { private Long id; // 用户名 @NotNull @Length(min=6, max=20, message="用户名长度不合法") private String userName; // 密码 @JsonIgnore @NotNull @Length(min=6, max=20, message="用户名长度不合法") private String password; // 姓名 @NotNull private String name; // 年龄 @NotNull private Integer age; // 性别，1男性，2女性 @NotNull private Integer sex; // 出生日期 @NotNull @DateTimeFormat(pattern="yyyy-MM-dd") @Past(message="生日必须是过去式") private Date birthday; // 创建时间 private Date created; // 更新时间 private Date updated;
}
UserController.java
@Controller @RequestMapping("user") public class UserController { @Autowired private UserService userService; @RequestMapping("users") public String toUsers() { return "users"; } @RequestMapping("list") @ResponseBody public Map<String, Object> queryUserAll() { Map<String, Object> map = new HashMap<>(); // 查询总条数 Long total = this.userService.queryTotal(); map.put("total", total); List<User> users = this.userService.queryUserAll(); map.put("rows", users); return map; } @RequestMapping("save") @ResponseBody public Map<String, String> saveUser(@Valid User user,BindingResult result) { Map<String,String> map=new HashMap<>(); if(result.hasErrors()) { //输出到控制台 System.out.println(result.getAllErrors());
//status用于前端校验是否执行成功 map.put("status", "500"); return map; } //调用Service方法新增用户信息 Boolean flag=this.userService.saveUser(user); if(flag) map.put("status", "200"); else map.put("status", "500"); return map; } //修改 @RequestMapping("edit") @ResponseBody public Map<String, String> editUser(@Valid User user) { Map<String,String> map=new HashMap<>(); //调用Service方法新增用户信息 Boolean flag=this.userService.editUser(user); if(flag) map.put("status", "200"); else map.put("status", "500"); return map; } //删除 @RequestMapping("delete") @ResponseBody public Map<String, String> deleteUser(@RequestParam("ids")List<Long> ids ) { Map<String,String> map=new HashMap<>(); //调用Service方法新增用户信息 Boolean flag=this.userService.deleteUserByIds(ids); if(flag) map.put("status", "200"); else map.put("status", "500"); return map; } }
标签：message pack package string png 监听器 create 行数据 路径
原文地址：https://www.cnblogs.com/ywqtro/p/12324352.html
