Spring boot 之一 HelloWorld

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Spring boot 之一 HelloWorld

watimer 2018-09-06 23:04:04 浏览664
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谨以此专辑,纪念Spring Boot学习之旅。

创建第一个项目以及跳转到JSP页面

1、新建项目
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2、项目创建完成后的目录结构
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3、pom.xml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>demo</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.4.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>10</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <!--web 支持-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <!--jsp页面使用jstl标签-->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
        </dependency>

        <!--用于编译jsp-->
        <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>
        </plugins>
    </build>

</project>

4、启动类DemoApplication.java 文件

package com.example.demo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class DemoApplication {

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

5、HelloController控制器文件

package com.example.demo;

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

import javax.servlet.http.HttpServletRequest;

@Controller
@RequestMapping(value = "/view")
public class HelloController {

    @RequestMapping(value = "/hello")
    public String hello(HttpServletRequest request){
        System.out.println("测试数据");
        request.setAttribute("demo","大漠孤烟直");
        request.setAttribute("demo2","长河落日圆");
        return "hello";
    }
}

6、application.properties文件

spring.mvc.view.prefix = /WEB-INF/views/
spring.mvc.view.suffix = .jsp

7、hello.jsp 文件

<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%>
<%
    String path = request.getContextPath();
    String basepath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

%>
<html>
<head>
    <base href="<%=basepath %>" />
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title>Insert title here</title>
</head>
<body>
    这是测试页面
    <%
        String demo = (String)request.getAttribute("demo");

        String demo2 = (String)request.getAttribute("demo2");

        System.out.println("demo :"+demo);
        System.out.println("demo2:"+demo2);
    %>

</body>
</html>```  

8、启动成功
![image](https://yqfile.alicdn.com/878fb0ca4dd3e27223e243e7e1690c64d97a6cc3.png)

9、访问测试
![image](https://yqfile.alicdn.com/cf4d9448373204825fbe75f150930d76db88b47c.png)

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