springboot学习（五）spring boot 整合jsp

最近在学习springboot，根据网上各位大神的博客以及官网例子，经历了小白的各种艰难险阻，尚未达到理想效果。spring boot整合jsp，可是把我整够了，各种搜学习资料，但是我不乐意直接放大神们的代码，所以我小坑略多。

1. pom.xml需要引入相关支持

   <?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>spring-boot-sample-jsp1</artifactId>
   	<version>0.0.1-SNAPSHOT</version>
   	<packaging>war</packaging>
   
   	<name>spring-boot-sample-jsp1</name>
   	<description>Demo project for Spring Boot</description>
   
   	<parent>
   		<groupId>org.springframework.boot</groupId>
   		<artifactId>spring-boot-starter-parent</artifactId>
   		<version>1.5.7.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>1.8</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-tomcat</artifactId>
   			<scope>provided</scope>
   		</dependency>
   		<dependency>
   			<groupId>org.springframework.boot</groupId>
   			<artifactId>spring-boot-starter-test</artifactId>
   			<scope>test</scope>
   		</dependency>
   
   		<!--添加对tomcat的支持 -->
   		<dependency>
   			<groupId>org.springframework.boot</groupId>
   			<artifactId>spring-boot-starter-tomcat</artifactId>
   			<scope>provided</scope>
   		</dependency>
   
   		<!--对jsp的支持 -->
   		<dependency>
   			<groupId>org.apache.tomcat.embed</groupId>
   			<artifactId>tomcat-embed-jasper</artifactId>
   			<scope>required</scope>
   		</dependency>
   	</dependencies>
   
   	<build>
   		<plugins>
   			<plugin>
   				<groupId>org.springframework.boot</groupId>
   				<artifactId>spring-boot-maven-plugin</artifactId>
   			</plugin>
   		</plugins>
   	</build>
   </project>
   

    
2. 测试controller，需要留意这里要注解是@Controller，不是@RestController，否则怎么配置都不会返回页面的，后者返回的是内容，各位可以去自习了解下

   package com.example.springbootsamplejsp1;
   
   import java.util.Map;
   
   import org.springframework.stereotype.Controller;
   import org.springframework.web.bind.annotation.RequestMapping;
   
   /** 
    * 功能说明
    * @date 2017年9月22日 下午3:00:06
    * @author wusj 
    * @version 1.0
    */
   @Controller
   public class TestController {
   
       @RequestMapping("/index")
       public String index(Map<String,Object> map){
           map.put("name", "wusj");
           return "index";
       }
   }
   

3. 新建maven项目时，需要选择war，而非jar，我不知道jar包该如何弄。我一开始哪里都对的，就是项目是jar包，而非war包，一直报错：This application has no explicit mapping for /error, so you are seeing this as a fallback
   
4. 启动类需要继承SpringBootServletInitializer，或者单独写个类继承它ServletInitializer.java

   package com.example.springbootsamplejsp1;
   
   import org.springframework.boot.builder.SpringApplicationBuilder;
   import org.springframework.boot.web.support.SpringBootServletInitializer;
   
   import com.example.SpringBootSampleJsp1Application;
   
   public class ServletInitializer extends SpringBootServletInitializer {
   
   	@Override
   	protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
   		return application.sources(SpringBootSampleJsp1Application.class);
   	}
   
   }
   

5. 配置文件需要配置相关信息

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

6. 以上都做到了还出不来的话，初步判断可能rp不如我好。
7. 希望大家不要走弯路，嘻嘻。项目结构如下