3.如何在SPRINGBOOT中使用JSP

pom.xml 

增加对JSP支持

 

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<?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.how2java</groupId>   <artifactId>springboot</artifactId>   <version>0.0.1-SNAPSHOT</version>   <name>springboot</name>   <description>springboot</description>   <packaging>war</packaging>         <parent>         <groupId>org.springframework.boot</groupId>         <artifactId>spring-boot-starter-parent</artifactId>         <version>1.5.9.RELEASE</version>     </parent>       <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>                       </dependency>         <dependency>               <groupId>junit</groupId>               <artifactId>junit</artifactId>               <version>3.8.1</version>               <scope>test</scope>         </dependency>         <!-- servlet依赖. -->         <dependency>               <groupId>javax.servlet</groupId>               <artifactId>javax.servlet-api</artifactId>                         </dependency>               <dependency>                      <groupId>javax.servlet</groupId>                      <artifactId>jstl</artifactId>               </dependency>         <!-- tomcat的支持.-->         <dependency>                <groupId>org.apache.tomcat.embed</groupId>                <artifactId>tomcat-embed-jasper</artifactId>                          </dependency>         </dependencies>       <properties>         <java.version>1.8</java.version>     </properties>       <build>         <plugins>             <plugin>                 <groupId>org.springframework.boot</groupId>                 <artifactId>spring-boot-maven-plugin</artifactId>             </plugin>         </plugins>     </build>   </project>

application.properties

 

在src/main/resources 目录下增加 application.properties文件，用于视图重定向jsp文件的位置

1 2	spring.mvc.view.prefix=/WEB-INF/jsp/ spring.mvc.view.suffix=.jsp

HelloController

修改HelloController，把本来的@RestController 改为@Controller。
这时返回"hello"就不再是字符串，而是根据application.properties 中的视图重定向，到/WEB-INF/jsp目录下去寻找hello.jsp文件

 

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package com.how2java.springboot.web; import java.text.DateFormat; import java.util.Date;   import org.springframework.stereotype.Controller; import org.springframework.ui.Model; import org.springframework.web.bind.annotation.RequestMapping;    @Controller public class HelloController {        @RequestMapping("/hello")     public String hello(Model m) {         m.addAttribute("now", DateFormat.getDateTimeInstance().format(new Date()));         return "hello";     } }

hello.jsp

在main目录下，新建-> webapp/WEB-INF/jsp 目录。
随后新建hello.jsp 文件，在其中使用EL 表达式显示放在HelloController的model中的当前时间。

 

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<%@ page language="java" contentType="text/html; charset=UTF-8"     pageEncoding="UTF-8"%> Hi JSP. 现在时间是  ${now}

启动测试

测试地址是：

 

http://127.0.0.1:8080/hello

 

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