Spring Boot入门篇一: Jsp项目搭建

1. 写在前面

写代码不要着急，注意配置文件或目录名不要存在空格

2. 开发环境/ 工具准备

JDK1.8.0_25

C:\Users\Administrator>java -version
java version "1.8.0_25"
Java(TM) SE Runtime Environment (build 1.8.0_25-b18)
Java HotSpot(TM) 64-Bit Server VM (build 25.25-b02, mixed mode)

Maven3.3.3

C:\Users\Administrator>mvn -v
Apache Maven 3.3.3 (7994120775791599e205a5524ec3e0dfe41d4a06; 2015-
Maven home: D:\appData\maven\apache-maven-3.3.3\bin\..
Java version: 1.8.0_25, vendor: Oracle Corporation
Java home: C:\Program Files\Java\jdk1.8.0_25\jre
Default locale: zh_CN, platform encoding: GBK
OS name: "windows 7", version: "6.1", arch: "amd64", family: "dos"

eclipse

3. 新建 Maven 项目

点击Next

点击Finish

由于我这里已经建过一个 spring-boot-example 了，所以就直接跳过了。

4. 配置 pom.xml 依赖

以下是我的 pom.xml 配置：

<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.springboot</groupId>
    <artifactId>spring-boot-example</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <!-- Spring Boot parent dependency -->
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.9.RELEASE</version>
    </parent>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <!-- 开发web项目必须依赖的 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!-- spring boot 自带的 tomcat 服务器 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-tomcat</artifactId>
            <scope>provided</scope>
        </dependency>
        <!-- jstl 标签库 -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
        </dependency>
        <!-- spring-boot默认已经不再支持jsp视图展示，要支持jsp需要加这个依赖 -->
        <dependency>
            <groupId>org.apache.tomcat.embed</groupId>
            <artifactId>tomcat-embed-jasper</artifactId>
            <scope>provided</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-surefire-plugin</artifactId>
                <configuration>
                    <useSystemClassLoader>false</useSystemClassLoader>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

5. 建立项目目录结构

以下是我的项目目录截图：

项目目录结构

这里需要注意了， Application.java 为 Spring Boot 的应用程序配置文件，是整个项目的启动文件，必须放在 com.example 中，即所有模块（dao、entity、service、web）的父包中。

6. 配置 application.properties

在你的 src/main/resources 目录下配置 application.properties 文件：

spring.mvc.view.prefix: /WEB-INF/views/
spring.mvc.view.suffix: .jsp
application.message: Hello Phil

webapp 目录结构：

webapp目录结构

其中，index.jsp:

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>spring-boot example</title>
</head>
<body>
  <p>index.jsp</p>
</body>
</html>

welcome.jsp:

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>spring-boot example</title>
</head>
<body>
  <p>welcome, spring-boot!</p>
</body>
</html>

7. 编写程序启动入口类 Application.java

package com.example;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.boot.web.support.SpringBootServletInitializer;

@SpringBootApplication
public class Application extends SpringBootServletInitializer {
    
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
    
    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
        return application.sources(Application.class);
    }
}

8. 编写 HelloController.java

package com.example.web;

import java.util.Date;
import java.util.Map;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
public class HelloController {
    
    @Value("${application.message: Hello World}")
    private String message = "Hello World";
    
    @RequestMapping("/")
    public String main () {
        return "index";
    }
    
    @RequestMapping("/welcome")
    public String welcome(Map<String, Object> model){
        model.put("time", new Date());
        model.put("message", this.message);
        return "welcome";
    }
    
}

9. 启动项目

打开终端，输入下面命令行：

mvn spring-boot:run

终端启动项目

访问： localhost:8080 显示 :

index.jsp

访问 localhost:8080/welcome 显示：

welcome.jsp

Enjoy it~