JAVA 框架-Springmvc

web.xml配置文件

<?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"
	id="WebApp_ID" version="3.1">
	<!-- 配置spring-mvc文件 -->
	<servlet>
		<servlet-name>springmvc</servlet-name>
		<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
		<init-param><!-- 如果不写这个spring会自动去WEB-INF下找springmvc-servlet.xml文件 -->
			<param-name>contextConfigLocation</param-name><!-- 固定的名字，不能改变 -->
			<param-value>classpath:spring-mvc.xml</param-value>
		</init-param>
		<load-on-startup>1</load-on-startup><!-- 服务器启动时加载 -->
	</servlet>
	<servlet-mapping>
		<servlet-name>springmvc</servlet-name>
		<url-pattern>*.do</url-pattern><!--接收所有以.do结尾的请求-->
	</servlet-mapping>
	<!--配置中文过滤器 -->
	<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>
</web-app>

 spring-mvc.xml配置文件

<?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:context="http://www.springframework.org/schema/context"
	xmlns:mvc="http://www.springframework.org/schema/mvc"
	xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd
		http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd">
<context:component-scan base-package="com.hanqi.controller"></context:component-scan><!--注解扫描器-->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"><!-- 视图解析器 -->
	<property name="prefix" value="/WEB-INF/page/"></property>
	<property name="suffix" value=".jsp"></property>
</bean>
<mvc:annotation-driven><!--配置spring消息转换器-->
	<mvc:message-converters register-defaults="false"><!--不使用spring默认提供的转换器-->
		<bean class="org.springframework.http.converter.StringHttpMessageConverter"></bean>
		<bean class= "org.springframework.http.converter.ByteArrayHttpMessageConverter"></bean>
		<bean class="org.springframework.http.converter.BufferedImageHttpMessageConverter"></bean>
		<bean class="com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter">
			<property name="supportedMediaTypes"><!-- 加入支持的媒体类型：返回contentType -->
				<list>
					<value>text/html;charset=utf-8</value><!-- 这里顺序不能反，一定先写text/html, 不然ie下会出现下载提示 -->
					<value>application/json;charset=utf-8</value>
				</list>
			</property>
		</bean>
	</mvc:message-converters>
</mvc:annotation-driven>
</beans>

 Appuser实体类文件

AppuserController类：

package com.hanqi.controller;

import static org.springframework.test.web.client.response.MockRestResponseCreators.withBadRequest;
import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.request;

import org.springframework.format.annotation.DateTimeFormat;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.SessionAttributes;
import org.springframework.web.servlet.ModelAndView;

import com.hanqi.model.Appuser;

@SessionAttributes("orgUser")//该注解只能修饰类，当使用model设置属性时，会自动将model里属性名为orgUser的键值对放到session里
//可以传多个({"",""})model也需要设置多个
@Controller//声明当前类为控制器类
@RequestMapping("/appuser")//定义接收的请求
public class AppuserController {
	//参数传递
	@RequestMapping("/login")//定义接受的请求
	public String login(@RequestParam("uname")String uname,String pword,@DateTimeFormat(pattern="yyyy-MM-dd")String birthday) {
		System.out.println("用户名为"+ uname);
		System.out.println("密码为"+ pword);
		System.out.println("生日为" + birthday);
		return "index";
	}
	//实体传递，当传递带日期型参数的实体类时需要在类的成员变量上注解@DateTimeFormat(pattern="yyyy-MM-dd")
	//否则会报400错误
	@RequestMapping("/register")
	public String register(Appuser user) {
		System.out.println("用户名为"+user.getUname() );
		System.out.println("密码为"+ user.getPword());
		return "index";
	}
	//页面跳转
	/*@RequestMapping(value="/{path}")//以路径作为请求参数
	public String toPage(@PathVariable("path")String page) {
		return page;
	}*/
	@ResponseBody//当向前台返回字符串时需要再加上这个注解
	public String select() {
		return null;
	}
	//使用ModelAndView
	//springmvc中，如果不设置视图的名字，会默认以请求路径作为视图名
	@RequestMapping("login1")
	//defaultValue如果找不到会以此值为默认值，required默认为true，表示请求参数必须存在，可为空字符串但不能为null
	public ModelAndView login1(@RequestParam(value="uname",defaultValue="uname",required=false)String uname,String pword,ModelAndView mav) {
		Appuser user = new Appuser();
		user.setUname(uname);
		user.setPword(pword);
		if("admin".equals(uname)&& "123".equals(pword)) {
			mav.addObject("orgUser", user);
			mav.setViewName("index");
		}
		return mav;
	}
	//使用Model
	@RequestMapping(value="login2",method={RequestMethod.POST})//设置接收的请求为post请求，常用的还有get，delete，put，如果不匹配会报405错误
	public String login2(String uname,String pword,Model model) {//同样也可以传入session，request对象进行属性设置
		Appuser user = new Appuser();
		user.setUname(uname);
		user.setPword(pword);
		if("admin".equals(uname)&& "123".equals(pword)) {
			model.addAttribute("orgUser", user);
		}
		return "index";
	}
	//在视图层可以拿到orgUser的值
}

 @ModelAttribute用法

package com.hanqi.controller;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;

import com.hanqi.model.Appuser;
@Controller
@RequestMapping("/appuser")
public class TestController {
	/*@ModelAttribute用法
	1.单独修饰方法时，优先于其他方法执行，同时设置一个属性；
	2.与requestMapping同时修饰时，请求路径作为视图层，返回值作为属性值放到request对象中；
	3.修饰参数时，该参数不再接受请求，而是接收注解修饰方法中的参数*/
	//第一种
	@ModelAttribute("username")
	public String getUname(String uname) {
		System.out.println("getUname: " + uname);
		// request.setAttribute("username", uname);
		return uname;
	}

	@RequestMapping("/login4")
	public String testAttribute1(String uname) {
		System.out.println("testAttribute1: " + uname);
		return "index";
	}
	//第二种
	@ModelAttribute("test")
	@RequestMapping("testModelAttribute2")
	public String testAttribute2(String uname) {
		System.out.println("testAttribute2: " + uname);
		// request.setAttribute("test", "success");
		return "success";
	}
	//第三种
	@ModelAttribute("user")
	public Appuser getUser(Appuser user) {
		user.setPword("1111");
		return user;
	}
	@RequestMapping("/login4")
	public String login4(@ModelAttribute("user")Appuser user) {
		return "index";
	}
}