SpringBoot视图层技术（整合JSP，FreeMarker）

一、SpringBoot整合JSP

项目目录结构图

1、pom文件添加关于整合jsp的依赖：

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>

	<groupId>com.example</groupId>
	<artifactId>demo</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>jar</packaging>
	
	<name>springBoot_view</name>
	<description>Demo project for Spring Boot</description>

	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>1.5.17.RELEASE</version>
		<relativePath/>
	</parent>

	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
		<java.version>1.8</java.version>
	</properties>

	<dependencies>
		<!-- springboot 启动器 支持全栈式的web开发，包括springmvc 和tomcat的jar包-->
		<dependency>
        	<groupId>org.springframework.boot</groupId>
        	<artifactId>spring-boot-starter-web</artifactId>
 		</dependency>
 		
 		<!-- jstl  -->
 		<dependency>
 		    <groupId>javax.servlet</groupId>
 		    <artifactId>jstl</artifactId>
 		</dependency>
 		
 		<!-- jasper -->
 		<dependency>
 		    <groupId>org.apache.tomcat.embed</groupId>
 		    <artifactId>tomcat-embed-jasper</artifactId>
 		</dependency>
	</dependencies>

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>
</project>

2、创建SpringBoot的全局配置文件，application.properties

#访问jsp的前缀
spring.mvc.view.prefix=/WEB-INF/jsp/
#访问jsp的后缀
spring.mvc.view.suffix=.jsp

3、User.java

package com.example.domain;

public class User {
	
	private int userId;
	private String name;
	private int age;
	
	public User(int userId, String name, int age) {
		this.userId = userId;
		this.name = name;
		this.age = age;
	}
        //get,set方法省略
}

4、UserController.java

package com.example.controller;
/**
 * Spring整合jsp
 */
@Controller
public class UserController {
	/**
	 * 处理请求
	 */
	@RequestMapping("/showUser")
	public String showUser(Model model){
		List<User> list=new ArrayList<>();
		list.add(new User(1,"张三",20));
		list.add(new User(2,"李四",24));
		list.add(new User(3,"王五",28));
		
		//需要一个model对象
		model.addAttribute("list",list);
		return "index";  // 自动查找/WEB-INF/jsp/index.jsp
	}
}

5、index.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>springBoot整合jsp</title>
</head>
<body>
<table border="1" align="center" width="50%">
    <tr>
        <th>ID</th>
        <th>Name</th>
        <th>Age</th>
    </tr>
    <c:forEach items="${list}" var="user">
        <tr>
            <td>${user.userId }</td>
            <td>${user.name }</td>
            <td>${user.age }</td>
        </tr>
    </c:forEach>
</table>
</body>
</html>

6、编写启动类：

package com.example;

@SpringBootApplication
public class AppJsp {
	public static void main(String[] args) {
		SpringApplication.run(AppJsp.class, args);
	}
}

运行启动类，访问：http://localhost:8080/showUser

二、SpringBoot整合FreeMarker

项目目录结构

1、修改pom文件：

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>

	<groupId>com.example</groupId>
	<artifactId>demo</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>jar</packaging>
	
	<name>springBoot_view</name>
	<description>Demo project for Spring Boot</description>

	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>1.5.17.RELEASE</version>
		<relativePath/> 
	</parent>

	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
		<java.version>1.8</java.version>
	</properties>

	<dependencies>
		<!-- springboot 启动器 支持全栈式的web开发，包括springmvc 和tomcat的jar包-->
		<dependency>
        	<groupId>org.springframework.boot</groupId>
        	<artifactId>spring-boot-starter-web</artifactId>
 		</dependency>
 		<!-- Freemarker启动器 -->
 		 <dependency>
 		<groupId>org.springframework.boot</groupId>
 		<artifactId>spring-boot-starter-freemarker</artifactId>
 		</dependency> 		
	</dependencies>

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>
</project>

2、编写视图

<html>
	<head>
		<title>展示用户数据</title>
		<meta charset="utf-8" />
	</head>	
	<body>
		<table border="1" align="center" width="50%">
			<tr>
			<td>ID</td>
			<td>Name</td>
			<td>Age</td>
			</tr>			
			<#list list as user>
			<tr>
			<td>${user.userId}</td>
			<td>${user.name}</td>
			<td>${user.age}</td>
			</tr>
			</#list>
		</table>
	</body>
</html>

注意：SpringBoot要求模板形式的试图层技术的文件必须要放到src/main/resources目录下必须要一个名称为templates。

（其他类与整合jsp一致）

运行启动类，访问：http://localhost:8080/showUser

SpringBoot视图层技术（整合JSP，FreeMarker）

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