19. Spring Boot 添加JSP支持【从零开始学Spring Boot】

这个部分比较复杂,所以单独创建一个工程来进行讲解;

     大体步骤:

(1)       创建Maven web project

(2)       在pom.xml文件添加依赖;

(3)       配置application.properties支持jsp

(4)       编写测试Controller

(5)       编写JSP页面

(6)       编写启动类App.java

1,FreeMarker
2
,Groovy
3
,Thymeleaf (Spring 官网使用这个)
4
,Velocity
5
,JSP (貌似Spring Boot官方不推荐,STS创建的项目会在src/main/resources 下有个templates 目录,这里就是让我们放模版文件的,然后并没有生成诸如SpringMVC 中的webapp目录)
不过本文还是选择大家都熟悉的JSP来举例,因为使用JSP与默认支持的模版需要特殊处理,所以拿来举例更好。

(1)创建Maven web project

使用Eclipse新建一个Maven Web Project ,项目取名为:

spring-boot-jsp

(2)在pom.xml文件添加依赖

<!-- spring boot parent节点,引入这个之后,在下面和springboot相关的就不需要引入版本了; -->

       <parent>

              <groupId>org.springframework.boot</groupId>

              <artifactId>spring-boot-starter-parent</artifactId>

              <version>1.3.3.RELEASE</version>

       </parent>

依赖包:

<!-- web支持: 1、webmvc; 2、restful; 3、jackjson支持; 4、aop ........ -->

              <dependency>

                     <groupId>org.springframework.boot</groupId>

                     <artifactId>spring-boot-starter-web</artifactId>

              </dependency>

             

              <!-- servlet依赖. -->

              <dependency>

                     <groupId>javax.servlet</groupId>

                     <artifactId>javax.servlet-api</artifactId>

                     <scope>provided</scope>

              </dependency>

             

              <!--

                     JSTL(JSP Standard TagLibrary,JSP标准标签库)是一个不断完善的开放源代码的JSP标签库,是由apachejakarta小组来维护的。JSTL只能运行在支持JSP1.2和Servlet2.3规范的容器上,如tomcat 4.x。在JSP2.0中也是作为标准支持的。

                    

                    不然报异常信息:

                     javax.servlet.ServletException:Circular view path [/helloJsp]: would dispatch back to the current handler URL[/helloJsp] again. Check your ViewResolver setup! (Hint: This may be the resultof an unspecified view, due to default view name generation.)

                      

               -->

              <dependency>

                     <groupId>javax.servlet</groupId>

                     <artifactId>jstl</artifactId>

              </dependency>

             

             

             

              <!-- tomcat的支持.-->

              <dependency>

                     <groupId>org.springframework.boot</groupId>

                     <artifactId>spring-boot-starter-tomcat</artifactId>

                     <scope>provided</scope>

              </dependency>

              <dependency>

                     <groupId>org.apache.tomcat.embed</groupId>

                     <artifactId>tomcat-embed-jasper</artifactId>

                     <scope>provided</scope>

              </dependency>

Jdk编译版本:

<build>

              <finalName>spring-boot-jsp</finalName>

              <plugins>

                     <plugin>

                            <artifactId>maven-compiler-plugin</artifactId>

                            <configuration>

                                  <source>1.8</source>

                                  <target>1.8</target>

                            </configuration>

                     </plugin>

              </plugins>

       </build>






(3)application.properties配置

上面说了spring-boot 不推荐JSP,想使用JSP需要配置application.properties。 
添加src/main/resources/application.properties内容:

#页面默认前缀目录

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

#响应页面默认后缀

spring.mvc.view.suffix=.jsp

#自定义属性,可以在Controller中读取

application.hello=HelloAngel From application

(4)编写测试Controller

编写类:com.kfit.jsp.controller.HelloController:

package com.kfit.jsp.controller;

 

import java.util.Map;

 

import org.springframework.beans.factory.annotation.Value;

import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.RequestMapping;

 

/**

 *测试

 * @authorAngel(QQ:412887952)

 * @version v.0.1

 */

@Controller

public class HelloController {

      

       //从 application.properties中读取配置,如取不到默认值为HelloShanhy

   @Value("${application.hello:Hello Angel}")

    private String hello;

   

      

       @RequestMapping("/helloJsp")

       public StringhelloJsp(Map<String,Object> map){

              System.out.println("HelloController.helloJsp().hello="+hello);

              map.put("hello",hello);

              return"helloJsp";

       }

}

(5)编写JSP页面

在 src/main 下面创建 webapp/WEB-INF/jsp 目录用来存放我们的jsp页面:helloJsp.jsp

<%@pagelanguage="java"contentType="text/html;charset=UTF-8"

    pageEncoding="UTF-8"%>

<!DOCTYPEhtmlPUBLIC "-//W3C//DTDHTML 4.01 Transitional//EN""http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<metahttp-equiv="Content-Type"content="text/html; charset=UTF-8">

<title>Insert title here</title>

</head>

<body>

       helloJsp

       <hr>

       ${hello}

      

</body>

</html>

(6)编写启动类

编写App.java启动类:

package com.kfit.jsp;

 

import org.springframework.boot.SpringApplication;

importorg.springframework.boot.autoconfigure.SpringBootApplication;

importorg.springframework.boot.context.web.SpringBootServletInitializer;

 

@SpringBootApplication

public class App extends SpringBootServletInitializer {

//    @Override

//    protectedSpringApplicationBuilder configure(SpringApplicationBuilder application) {

//           returnapplication.sources(App.class);

//    }

      

       public static voidmain(String[] args) {

              SpringApplication.run(App.class,args);

       }

}

右键Run As  Java Application访问:http://127.0.0.1:8080/helloJsp 可以访问到:

helloJsp


Hello Angel Fromapplication

特别说明:针对el表达式,类似${hello}这个对于servlet的版本是有限制的,2.4版本版本以下是不支持的,是无法进行识别的,请注意。


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