spring-MVC web.xml springmvc-servlet.xml 配置文件

以你之姓@ 2023-10-05 10:22 61阅读 0赞

## springMVC配置文件 ##

### web.xml ###

<?xml version="1.0" encoding="UTF-8"?>
    <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    	xmlns="http://java.sun.com/xml/ns/javaee"
    	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
    	id="WebApp_ID" version="3.0">
    
    
    	
    	<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-servlet.xml</param-value>
    		</init-param>
    
    		
    		<load-on-startup>1</load-on-startup>
    
    		
    	<servlet-mapping>
    		<servlet-name>DispatcherServlet</servlet-name>
    		<url-pattern>/</url-pattern>
    	</servlet-mapping>
    
    	
    	<filter>
    		<filter-name>encodingFilter</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>
    		<init-param>
    			<param-name>forceEncoding</param-name>
    			<param-value>true</param-value>
    		</init-param>
    	</filter>
    
    	<filter-mapping>
    		<filter-name>encodingFilter</filter-name>
    		<url-pattern>/*</url-pattern>
    	</filter-mapping>
    	</servlet>
    
    
    	
    	<servlet-mapping>
    		<servlet-name>DispatcherServlet</servlet-name>
    		<url-pattern>/</url-pattern>
    	</servlet-mapping>
    </web-app>

### springmvc-servlet.xml配置文件 ###

<?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans"
    	xmlns:context="http://www.springframework.org/schema/context"
    	xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    	xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context-3.2.xsd
        http://www.springframework.org/schema/mvc
        http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd
        ">
    
    	
    	<context:component-scan base-package="controller" />
    
    	
    	<mvc:annotation-driven />
    
    	
    	
    	<bean
    	class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    		<property name="prefix" value="/WEB-INF/jsp/" />
    		<property name="suffix" value=".jsp" />
    	</bean>
    
    	
    	<mvc:resources location="/static/" mapping="/static/**" />
    
    	
    	<bean
    		class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver">
    		<property name="exceptionMappings">
    			<props>
    				<prop key="java.lang.RuntimeException">error</prop>
    			</props>
    		</property>
    	</bean>
    </beans>

### controller类 ###

#### LoginController.java ####

/**
    	 * 实现登录功能
    	 * 
    	 * @param username
    	 * @param password
    	 * @return
    	 */
    	@RequestMapping(value = "/login", method = RequestMethod.POST)
    	// @RequestParam(required = true参数必须 说明表单里必须有name属性且值和参数名一样；false参数不必须,value属性值和表单里的name属性值相同) 参数名和表单name属性值相同value属性可以省略
    	//注解作用：标注参数是必须的
    	String login(
    			@RequestParam(required = false, value = "uname") String username,
    			@RequestParam(required = false, value = "upwd") String password) {
        
    		// 防止出现空指针异常
    		if ("admin".equals(username) && "123456".equals(password)) {
        
    			return "index";
    		}
    		return "login/login";
    	}
    //等效于
    @RequestMapping(value = "/login", method = RequestMethod.POST, params = {
        
    			"username", "password" })
    	String login(String username, String password) {
        
    		System.out.println(username);
    		System.out.println(password);
    		// 防止出现空指针异常
    		if ("admin".equals(username) && "123456".equals(password)) {
        
    			return "index";
    		}
    		return "login/login";
    	}

#### UserController.java ####

@RequestMapping(value = "/useradd", method = RequestMethod.POST)
    	// 使用对象作参数 ，user的属性名必须和表单的name属性值相同 ，user里面没有的属性在写在后面
    	String useradd(User user, String reUserPassword) {
        
    		System.out.println(user.getUserCode());
    		System.out.println(user.getUserName());
    		System.out.println(reUserPassword);
    		return "user/useradd";
    	}

#### 把参数传给视图 ####

@RequestMapping(value = "/login", method = RequestMethod.POST, params = {
        
    			"username", "password" })
    	//返回
    	String login(String username, String password, Model model) {
        
    		User user = new User();
    		if ("admin".equals(username) && "123456".equals(password)) {
        
    			user.setUserName(username);
    			user.setUserPassword(password);
    		} else {
        
    			return "login/login";
    		}
    		// 绑定数据
    		// mav.addAllObjects();//添加多个对象
    		model.addAttribute(user);
    		return "index";
    	}

#### 转发的请求是POST那转发去的页码也必须是POST ####

@RequestMapping(value = "/login", method=RequestMethod.POST)
    String login(){
        
    	//返回的是url
    	return "forward:index.html";
    }
    @RequestMapping(value = "/index.html", method=RequestMethod.POST)
    String index(){
        
    	return "index";
    }
    /* 		../上一层      / 根目录		*/

#### 重定向 客户端请求两次 ####

String login(){
        
    	//返回的是url
    	return "redirect:index.html";
    }