7.SpringMVC参数，Controller返回值类型，Web对象的获取

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工程目录结构:

项目依赖包:

SpringMVC参数

Vo

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package com.course.vo;

public class User {

	private Integer id;
	private String name;
	private Integer age;
	
	public User() {
		super();
	}
	
	public User(Integer id, String name, Integer age) {
		super();
		this.id = id;
		this.name = name;
		this.age = age;
	}
	
	public Integer getId() {
		return id;
	}
	public void setId(Integer id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public Integer getAge() {
		return age;
	}
	public void setAge(Integer age) {
		this.age = age;
	}

	@Override
	public String toString() {
		return "User [id=" + id + ", name=" + name + ", age=" + age + "]";
	}
			
}
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package com.course.vo;

import java.util.Date;

import org.springframework.format.annotation.DateTimeFormat;

public class UserInfo {

	private Integer id;
	private String name;
	private Integer age;
	@DateTimeFormat(pattern = "yyyy-MM-dd")
	private Date hireDate;
	
	public UserInfo() {
		super();
	}

	public UserInfo(Integer id, String name, Integer age, Date hireDate) {
		super();
		this.id = id;
		this.name = name;
		this.age = age;
		this.hireDate = hireDate;
	}

	public Integer getId() {
		return id;
	}

	public void setId(Integer id) {
		this.id = id;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public Integer getAge() {
		return age;
	}

	public void setAge(Integer age) {
		this.age = age;
	}

	public Date getHireDate() {
		return hireDate;
	}

	public void setHireDate(Date hireDate) {
		this.hireDate = hireDate;
	}

	@Override
	public String toString() {
		return "UserInfo [id=" + id + ", name=" + name + ", age=" + age + ", hireDate=" + hireDate + "]";
	}
	
}

Controller

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package com.course.controller;

import java.util.Arrays;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.ModelAndView;

import com.course.vo.User;
import com.course.vo.UserInfo;

@Controller
@RequestMapping("user")
public class UserController {

	// 基本数据类型的参数
	@RequestMapping(value = "addUserInfo01", method = RequestMethod.POST)
	public ModelAndView addUserInfo01(String username, String password, Integer age) {
		
		System.out.println(username + "   " + password + "   " + age);
		// name1   123456   20
		// 封装页面地址和发送到页面的数据
		ModelAndView modelAndView = new ModelAndView();
		// 相当于httpServletRequest.getRequestDispatcher("/WEB-INF/view/UserList.jsp").forward(httpServletRequest, httpServletResponse);
		modelAndView.setViewName("/WEB-INF/view/success.jsp");
		
		return modelAndView;
	}
	
	// 数组类型的参数
	@RequestMapping(value = "addUserInfo02", method = RequestMethod.POST)
	public ModelAndView addUserInfo02(String[] hobby) {
		System.out.println(Arrays.toString(hobby));
		// [reading, riding, running, swimming]
		// 封装页面地址和发送到页面的数据
		ModelAndView modelAndView = new ModelAndView();
		// 相当于httpServletRequest.getRequestDispatcher("/WEB-INF/view/UserList.jsp").forward(httpServletRequest, httpServletResponse);
		modelAndView.setViewName("/WEB-INF/view/success.jsp");
		
		return modelAndView;
	}
	
	// 对象类型的参数
	@RequestMapping(value = "addUserInfo03", method = RequestMethod.POST)
	public ModelAndView addUserInfo03(User user) {
		System.out.println(user);
		// User [id=1, name=name2, age=10]
		// 封装页面地址和发送到页面的数据
		ModelAndView modelAndView = new ModelAndView();
		// 相当于httpServletRequest.getRequestDispatcher("/WEB-INF/view/UserList.jsp").forward(httpServletRequest, httpServletResponse);
		modelAndView.setViewName("/WEB-INF/view/success.jsp");
		
		return modelAndView;
	}
	
	// 包含时间类型属性的对象类型的参数
	@RequestMapping(value = "addUserInfo04", method = RequestMethod.POST)
	public ModelAndView addUserInfo04(UserInfo userInfo) {
		System.out.println(userInfo);
		// UserInfo [id=1, name=name2, age=10, hireDate=Thu Jan 10 00:00:00 CST 2002]
		// 封装页面地址和发送到页面的数据
		ModelAndView modelAndView = new ModelAndView();
		// 相当于httpServletRequest.getRequestDispatcher("/WEB-INF/view/UserList.jsp").forward(httpServletRequest, httpServletResponse);
		modelAndView.setViewName("/WEB-INF/view/success.jsp");
		
		return modelAndView;
	}
		
}

index.jsp

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<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>

	<h2>1.parameters: basic data type</h2>
	<form action="user/addUserInfo01.do" method="post">
		<p>
			name: <input type="text" name="username">
		</p>
		<p>
			password: <input type="password" name="password">
		</p>
		<p>
			age: <input type="text" name="age">
		</p>
		<p>
			<input type="submit" value="submit">
		</p>
	</form>
	
	<h2>2.parameters: array type</h2>
	<form action="user/addUserInfo02.do" method="post">
		<p>hobby: </p>
		<input type="checkbox" name="hobby" value="reading">reading
		<input type="checkbox" name="hobby" value="riding">riding
		<input type="checkbox" name="hobby" value="running">running
		<input type="checkbox" name="hobby" value="swimming">swimming
		<p>
			<input type="submit" value="submit">
		</p>
	</form>
	
	<h2>3.parameters: object type</h2>
	<form action="user/addUserInfo03.do" method="post">
		<p>
			id: <input type="text" name="id">
		</p>
		<p>
			name: <input type="text" name="name">
		</p>
		<p>
			age: <input type="text" name="age">
		</p>
		<p>
			<input type="submit" value="submit">
		</p>
	</form>
	
	<h2>4.parameters: object type which contain date type</h2>
	<form action="user/addUserInfo04.do" method="post">
		<p>
			id: <input type="text" name="id">
		</p>
		<p>
			name: <input type="text" name="name">
		</p>
		<p>
			age: <input type="text" name="age">
		</p>
		<p>
			hireDate: <input type="text" name="hireDate">
		</p>
		<p>
			<input type="submit" value="submit">
		</p>
	</form>

</body>
</html>

success.jsp

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<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
	<p>Add successfully!</p>
</body>
</html>

springmvc.xml

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<?xml version="1.0" encoding="UTF-8"?>

<!-- 头文件 -->
<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"
	xmlns:aop="http://www.springframework.org/schema/aop"
	xmlns:tx="http://www.springframework.org/schema/tx"
	xsi:schemaLocation="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.xsd
        http://www.springframework.org/schema/mvc
		http://www.springframework.org/schema/mvc/spring-mvc.xsd">
		

	<!-- 
		配置控制器
		包扫描
	 -->
	 <context:component-scan base-package="com.course.controller"></context:component-scan>
	
	<!-- 
		合并注解的控制器映射器和控制器适配器的配置
		对控制器映射器和控制器适配器进行加强，如把对象转化为json字符串
	 -->
	<mvc:annotation-driven></mvc:annotation-driven>
	
	<!-- 配置视图解析器 -->
	<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"></bean>
	
</beans>

web.xml

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<?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">
  <display-name>01_springmvc_hello</display-name>
  <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>
  
  <!-- 配置前端控制器 -->
  <servlet>
  	<servlet-name>springmvc</servlet-name>
  	<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
  	
  	<!-- 加载springmvc.xml -->
  	<init-param>
  		<param-name>contextConfigLocation</param-name>
  		<param-value>classpath:springmvc.xml</param-value>
  	</init-param>
  	
  	<!-- 启动加载 -->
  	<load-on-startup>1</load-on-startup>
  	
  </servlet>
  
  <servlet-mapping>
  	<servlet-name>springmvc</servlet-name>
  	<url-pattern>*.do</url-pattern>
  </servlet-mapping>
  
</web-app>
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# Global logging configuration
log4j.rootLogger=INFO, stdout
# MyBatis logging configuration...
log4j.logger.org.mybatis.example.BlogMapper=TRACE
# Console output...
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%5p [%t] - %m%n

启动Tomcat，浏览器访问: http://localhost:8080/01_springmvc_init/index.jsp

Controller返回值类型

Controller返回值类型:

  1. ModelAndView
  2. String

Controller

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package com.course.controller;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.ModelAndView;

import com.course.vo.User;
import com.course.vo.UserInfo;

@Controller
@RequestMapping("user")
public class UserController {

	@RequestMapping("getUserList5")
	public ModelAndView getUserList5() {
		List<User> userList = new ArrayList<>();
		User user;
		for (int i = 0; i < 5; i++) {
			user = new User(i, "name" + i, 10 + i);
			userList.add(user);
		}
		
		ModelAndView modelAndView = new ModelAndView();
		modelAndView.addObject("userList", userList);
		modelAndView.setViewName("/WEB-INF/view/UserList.jsp");
		
		return modelAndView;
	}
	
	@RequestMapping("getUserList10")
	public String getUserList10(Model model) {
		List<User> userList = new ArrayList<>();
		User user;
		for (int i = 0; i < 10; i++) {
			user = new User(i, "name" + i, 10 + i);
			userList.add(user);
		}

        // 相当于httpServletRequest.setAttribute();
		model.addAttribute("userList", userList);
		
		return "/WEB-INF/view/UserList.jsp";
	}
	
}

UserList.jsp

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<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
	<h1>User List</h1>
	<hr/>
	<table align="center" width="60%" border="1" cellspacing="5">
		<thead>
			<tr>
				<th>Id</th>
				<th>Name</th>
				<th>Age</th>
			<tr>
		</thead>
		<tbody>
			<c:forEach var="user" items="${userList}">
				<tr>
					<td>${user.id}</td>
					<td>${user.name}</td>
					<td>${user.age}</td>
				</tr>
			</c:forEach>
		</tbody>
	</table>
</body>
</html>

启动Tomcat，

浏览器访问: http://localhost:8080/01_springmvc_init/user/getUserList5.do

浏览器访问: http://localhost:8080/01_springmvc_init/user/getUserList10.do

Web对象的获取

Web对象:

  1. HttpServletRequest
  2. HttpServletResponse
  3. HttpSession
  4. ServletContext

Controller

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package com.course.controller;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.ModelAndView;

import com.course.util.WebObjectUtil;
import com.course.vo.User;
import com.course.vo.UserInfo;

@Controller
@RequestMapping("user")
public class UserController {
	
	// 方法1: 方式参数注入
	@RequestMapping(value = "getWebObject")
	public String getWebObject(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, HttpSession httpSession) {
		System.out.println("httpServletRequest = " + httpServletRequest);
		System.out.println("httpServletResponse = " + httpServletResponse);
		
		HttpSession httpSession2 = httpServletRequest.getSession();
		System.out.println("httpSession = " + httpSession);
		System.out.println("httpSession2 = " + httpSession2);
		
		ServletContext servletContext = httpServletRequest.getServletContext();
		ServletContext servletContext2 = httpSession.getServletContext();
		System.out.println("servletContext = " + servletContext);
		System.out.println("servletContext2 = " + servletContext2);
		
		// httpServletRequest = org.apache.catalina.connector.RequestFacade@edd5a0e
		// httpServletResponse = org.apache.catalina.connector.ResponseFacade@6614eaaf
		// httpSession = org.apache.catalina.session.StandardSessionFacade@67fd41ae
		// httpSession2 = org.apache.catalina.session.StandardSessionFacade@67fd41ae
		// servletContext = org.apache.catalina.core.ApplicationContextFacade@3296dfad
		// servletContext2 = org.apache.catalina.core.ApplicationContextFacade@3296dfad

		return "/WEB-INF/view/success.jsp";
	}
	
    // 方法2: 类属性注入
	@Autowired
	private HttpServletRequest httpServletRequest;
	@Autowired
	private HttpServletResponse httpServletResponse;
	@Autowired
	private HttpSession httpSession;
	
	@RequestMapping(value = "getWebObject2")
	public String getWebObject2() {
		System.out.println("httpServletRequest = " + httpServletRequest);
		System.out.println("httpServletResponse = " + httpServletResponse);
		
		httpSession.setAttribute("aaa", "123");
		HttpSession httpSession2 = httpServletRequest.getSession();
		System.out.println(httpSession2.getAttribute("aaa"));
			
		ServletContext servletContext = httpServletRequest.getServletContext();
		ServletContext servletContext2 = httpSession.getServletContext();
		System.out.println("servletContext = " + servletContext);
		System.out.println("servletContext2 = " + servletContext2);
		
		// httpServletRequest = Current HttpServletRequest
		// httpServletResponse = Current HttpServletResponse
		// 123
		// servletContext = org.apache.catalina.core.ApplicationContextFacade@163708e8
		// servletContext2 = org.apache.catalina.core.ApplicationContextFacade@163708e8
				
		return "/WEB-INF/view/success.jsp";
	}
	
    // 方法3: 使用解耦方式
	@RequestMapping(value = "getWebObject3")
	public String getWebObject3() {
		WebObjectUtil.getWebObjectUtil();
		return "/WEB-INF/view/success.jsp";
	}
	
}

Util: WebObjectUtil

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package com.course.util;

import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

public class WebObjectUtil {

	public static void getWebObjectUtil() {
		ServletRequestAttributes servletRequestAttributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
		HttpServletRequest httpServletRequest = servletRequestAttributes.getRequest();
		HttpServletResponse httpServletResponse = servletRequestAttributes.getResponse();
		System.out.println("httpServletRequest = " + httpServletRequest);
		System.out.println("httpServletResponse = " + httpServletResponse);
		
		HttpSession httpSession = httpServletRequest.getSession();
		System.out.println("httpSession = " + httpSession);
		ServletContext servletContext = httpServletRequest.getServletContext();
		System.out.println("servletContext = " + servletContext);

		// httpServletRequest = org.apache.catalina.connector.RequestFacade@1b8d7d3a
		// httpServletResponse = org.apache.catalina.connector.ResponseFacade@77c19b8f
		// httpSession = org.apache.catalina.session.StandardSessionFacade@2048cb71
		// servletContext = org.apache.catalina.core.ApplicationContextFacade@6221abcc
				
	}
}

启动Tomcat，

浏览器访问:

http://localhost:8080/01_springmvc_init/user/getWebObject.do

http://localhost:8080/01_springmvc_init/user/getWebObject2.do

http://localhost:8080/01_springmvc_init/user/getWebObject3.do

结果均为: