SpringMVC @PathVariable注解
@Controller public class PathController { @RequestMapping("PathVariable/{id}/{username}") public String PathVariable(@PathVariable("id") String id, @PathVariable("username") String userName){ System.out.println("id:"+id); System.out.println("userName:"+userName); return "success"; } }
Springmvc参数注入引入
@RestController public class TestDataController { /** * 紧耦合方式参数注入 * 使用传统的HttpServletRequest对象获取参数 */ @RequestMapping("/getParamByRequest") public String getParam1(HttpServletRequest req, HttpServletResponse resp){ String username=req.getParameter("username"); String password=req.getParameter("password"); return "a"; } /** * 解耦合方式 * HttpServletRequest对象获取参数 通过SpringMVC框架功能，自动转换参数 * 处理单元参数列表中参数名必须和请求中的参数名一致 * */ @RequestMapping("/getParamByRequest.do") public String getParam2(String username,String password){ System.out.println("username"+username); System.out.println("password"+password); return "success"; } }
SpringMVC接收POJO类型的参数
form表单
<%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>Title</title> </head> <body> <form action="getDataByPojo"> 姓名： <p><input type="text" name="pname"></p> 年龄： <p><input type="text" name="page"></p> <p>性别： <input type="radio" name="gender" value="1">男 <input type="radio" name="gender" value="0">女 </p> <p>爱好 <input type="checkbox" name="hobby" value="1">篮球 <input type="checkbox" name="hobby" value="2">足球 <input type="checkbox" name="hobby" value="3">羽毛球 </p> <p>生日： <input type="text" name="birthdate"> </p> <input type="submit"> </form> </body> </html>
实体类：
public class Person implements Serializable { private String pname; private String page; private String gender; private String[] hobby; private String birthdate; public Person(String pname, String page, String gender, String[] hobby, String birthdate) { this.pname = pname; this.page = page; this.gender = gender; this.hobby = hobby; this.birthdate = birthdate; } public Person() { } @Override public String toString() { return "Person{" + "pname='" + pname + '\'' + ", page='" + page + '\'' + ", gender='" + gender + '\'' + ", hobby=" + Arrays.toString(hobby) + ", birthdate='" + birthdate + '\'' + '}'; } public String getPname() { return pname; } public void setPname(String pname) { this.pname = pname; } public String getPage() { return page; } public void setPage(String page) { this.page = page; } public String getGender() { return gender; } public void setGender(String gender) { this.gender = gender; } public String[] getHobby() { return hobby; } public void setHobby(String[] hobby) { this.hobby = hobby; } public String getBirthdate() { return birthdate; } public void setBirthdate(String birthdate) { this.birthdate = birthdate; } }
Controller：
@RestController public class ReceiveDataController { /** * 使用pojo接受参数时，注意事项 * 提交的参数名必须和pojo的属性名保持一致 * 底层是通过反射给参数列表的属性赋值 * 通过set方法设置属性值的。不是操作属性。 * PoJO的属性一定要有set方法，要不然就会接受失败 * @param p * @return */ @RequestMapping("/getDataByPojo") public String getDataByPojo(Person p){ System.out.println(p); return "success"; } }
注入Date类型的参数
@RequestMapping("/getDataByPojo") public String getDataByPojo(@DateTimeFormat(pattern = "yyyy-MM-dd") Date birthdate){ System.out.println(birthdate); return "success"; } //注意，属性值的名称要对应一致
注入List类型的参数
宠物： <p> 宠物1 ： 姓名:<input type="text" name="pets[0].petName" > 类型:<input type="text" name="pets[0].petType"> </p> <p> 宠物2 ： 姓名:<input type="text" name="pets[1].petName" > 类型:<input type="text" name="pets[1].petType"> </p> //把list当作对象的一个属性
注入Map类型的参数
<p> 宠物3 ： 姓名:<input type="text" name="petMap['a'].petName" > 类型:<input type="text" name="petMap['a'].petType"> </p> <p> 宠物4 ： 姓名:<input type="text" name="petMap['b'].petName" > 类型:<input type="text" name="petMap['b'].petType"> </p>
实体类：
@AllArgsConstructor @NoArgsConstructor @Data public class Person implements Serializable { private String pname; private String page; private String gender; private String[] hobby; private String birthdate; private List<Pet> pets; private Map<String,Pet> petMap; }
SpringMVC解决乱码问题：
<filter> <filter-name>enFilter</filter-name> <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class> <init-param> <param-name>encoding</param-name> <param-value>utf-8</param-value> </init-param> </filter> <filter-mapping> <filter-name>enFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping>
SpringMVC常见注解
@RequestMapping; //用于建立请求URL和处理请求方法之间的对应关系 @RequestParam //用于对指定的形参赋值（当页面中请求的参数和代码中处理的参数名称不一致时，需要使用这个注解） @PathVariable //用于绑定url中的占位符，取出某一个字符串段的数据。/delete/{id},如果想取出id这个属性，需要这个注解 @RequestHeader//获取请求头的信息 @CookieValue //获取请求中的cookie信息
SpringMVC请求转发和重定向
@Controller public class TestResponse { /** * 返回字符串告诉DispatcherServlet跳转的路径 * 在路径之前放上一个forward:关键字，就是请求转发 * 如果路径前的关键字是forward,那么可以省略不写 * @return */ @RequestMapping("demo2") public String testDemo2(){ return "forward:/forward.jsp"; } /** * 返回字符串告诉DispatcherServlet跳转的路径 * 在路径之前放上一个redirect:关键字，就是重定向 * 如果路径前的关键字是redirect,那么不可以省略 * /表示当前项目下，这里不需要项目的上下文路径 * @return */ @RequestMapping("demo3") public String testDemo3(){ return "redirect:/forward.jsp"; } } @RequestMapping("demo4") public View testDemo4(){ View view=null; view=new InternalResourceView("/forwardPage.jsp"); view=new RedirectView("/redirectPage.jsp"); return view; }
SpringMVC响应JSON
导入依赖：
<dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-databind</artifactId> <version>2.11.4</version> </dependency>
控制器操作：
@ResponseBody @RequestMapping("testAjax") public Pet testAjax() throws JsonProcessingException { Pet pet=new Pet("Tom","cat"); return pet; }
SpringMVC SSM 整合
ssm整合就是将spring ,springmvc mybatis整合起来。mybatis中要用到的sqlsessionfactory和sqlsession交给spring容器来创建。
配置文件
web.xml:
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd" version="4.0"> <!--DispatcherServlet--> <servlet> <servlet-name>dispatcherServlet</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:springMVC.xml</param-value> </init-param> </servlet> <servlet-mapping> <servlet-name>dispatcherServlet</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> <!-- CharcterEncodingFilter--> <filter> <filter-name>characterEncodingFilter</filter-name> <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class> <init-param> <param-name>encoding</param-name> <param-value>UTF-8</param-value> </init-param> </filter> <filter-mapping> <filter-name>characterEncodingFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <!-- 向ServletContext中添加spring核心配置文件的位置--> <context-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:applicationContext.xml</param-value> </context-param> <!-- Spring核心容器配置 通过监听器，监听JavaWeb项目中的ServletContext创建的时候，就创建一个spring容器，并放入ServletContext对象中 --> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> </web-app>
SpringMVC.xml:
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 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-4.3.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd http://www.springframework.org/schema/mvc https://www.springframework.org/schema/mvc/spring-mvc.xsd"> <!-- 扫描controller--> <context:component-scan base-package="com.msb.controller"></context:component-scan> <!-- 开启mvc注解驱动，自动给我们配置好处理器映射器和处理器适配器--> <mvc:annotation-driven/> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> </bean> <!--<!– 指定前缀和后缀–>--> <!-- <property name="prefix" value="/WEB-INF/"></property>--> <!-- <property name="suffix" value=".jsp"></property>--> <!-- </bean>--> <!-- 静态资源放行--> <!-- mapping url中的路径 location=对应的路径到项目--> <!-- <mvc:resources mapping="/js/**" location="/js/"></mvc:resources>--> </beans>
