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Spring Boot JSP 视图解析器教程

教程分享 > Java教程 (1064) 2024-04-17 12:31:29

学习创建和配置使用JSP 模板文件渲染视图层的Spring Boot jsp 视图解析器。本示例使用嵌入式 Tomcat 服务器来运行应用程序。

演示项目源码下载：（访问密码：9987）
spring-boot-demo-jsp-example.zip

源代码结构

此应用程序中的文件作为图像中的给定结构放置。

Spring Boot 应用程序结构

Maven 依赖 – pom.xml

此应用程序使用下面给出的依赖项。

<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/maven-v4_0_0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.howtodoinjava</groupId>
    <artifactId>spring-boot-demo</artifactId>
    <packaging>war</packaging>
    <version>0.0.1-SNAPSHOT</version>
    <name>spring-boot-demo Maven Webapp</name>
    <url>http://maven.apache.org</url>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.1.RELEASE</version>
    </parent>
    <properties>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>
        <!-- Web -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!-- Tomcat Embed -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-tomcat</artifactId>
            <scope>provided</scope>
        </dependency>
        <!-- JSTL -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
        </dependency>
        <!-- To compile JSP files -->
        <dependency>
            <groupId>org.apache.tomcat.embed</groupId>
            <artifactId>tomcat-embed-jasper</artifactId>
            <scope>provided</scope>
        </dependency>
    </dependencies>
</project>

Spring Boot 应用程序初始化器
生成可部署的战争文件的第一步是提供一个SpringBootServletInitializer子类并覆盖其configure()方法。这利用了 Spring Framework 的 Servlet 3.0 支持，并允许您在应用程序由 servlet 容器启动时对其进行配置。

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

Spring Controller

控制器类可以将方法映射到应用程序中的特定 URL。在给定的应用程序中，它有两个视图，即“/”和“/next”。

import java.util.Map;
 
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
 
@Controller
public class IndexController {
 
    @RequestMapping("/")
    public String home(Map<String, Object> model) {
        model.put("message", "HowToDoInJava Reader !!");
        return "index";
    }
     
    @RequestMapping("/next")
    public String next(Map<String, Object> model) {
        model.put("message", "You are in new page !!");
        return "next";
    }
 
}

Spring Boot JSP ViewResolver 配置

要解析JSP文件的位置，您可以有两种方法。

1) 在 application.properties 中添加条目

spring.mvc.view.prefix=/WEB-INF/view/
spring.mvc.view.suffix=.jsp
 
//For detailed logging during development
 
logging.level.org.springframework=TRACE
logging.level.com=TRACE

2）配置InternalResourceViewResolver来服务JSP页面

import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.ViewResolverRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
import org.springframework.web.servlet.view.InternalResourceViewResolver;
import org.springframework.web.servlet.view.JstlView;
 
@Configuration
@EnableWebMvc
@ComponentScan
public class MvcConfiguration extends WebMvcConfigurerAdapter
{
    @Override
    public void configureViewResolvers(ViewResolverRegistry registry) {
        InternalResourceViewResolver resolver = new InternalResourceViewResolver();
        resolver.setPrefix("/WEB-INF/view/");
        resolver.setSuffix(".jsp");
        resolver.setViewClass(JstlView.class);
        registry.viewResolver(resolver);
    }
}

JSP 文件

这个 spring boot jsp 示例中使用的两个 JSP 文件如下。
index.jsp

<!DOCTYPE html>
<%@ taglib prefix="spring" uri="http://www.springframework.org/tags"%>
<html lang="en">
<body>
    <div>
        <div>
            <h1>Spring Boot JSP Example</h1>
            <h2>Hello ${message}</h2>
             
            Click on this <strong><a href="next">link</a></strong> to visit another page.
        </div>
    </div>
</body>
</html>

next.jsp

<!DOCTYPE html>
<%@ taglib prefix="spring" uri="http://www.springframework.org/tags"%>
<html lang="en">
<body>
    <div>
        <div>
            <h1>Another page</h1>
            <h2>Hello ${message}</h2>
             
            Click on this <strong><a href="/">link</a></strong> to visit previous page.
        </div>
    </div>
</body>
</html>