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9、SpringBoot 新增JSP支援

SpringBoot 新增JSP支援

專案結構

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在pom.xml檔案新增依賴

<?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>cn.ylx</groupId> <artifactId>springboot-helloworld</artifactId> <version>1.0-SNAPSHOT</version> <packaging>jar</packaging> <name>springboot-helloworld</name> <description
>
springboot-helloworld</description> <!-- SpringBoot專案要繼承的父類 --> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.1.0.RELEASE</version> <
relativePath
/>
<!-- lookup parent from repository --> </parent> <!-- SpringBoot專案要繼承的父類 --> <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> <!-- web支援: 1、web mvc; 2、restful; 3、jackjson支援; 4、aop ........ --> <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> <!-- servlet 依賴 --> <dependency> <groupId>javax.servlet</groupId> <artifactId>javax.servlet-api</artifactId> <scope>provided</scope> </dependency> <!-- JSTL 標籤庫 --> <dependency> <groupId>javax.servlet</groupId> <artifactId>jstl</artifactId> </dependency> <!-- tomcat 的支援 --> <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> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> </project>

JSTL(JSP Standard Tag Library,JSP標準標籤庫)是一個不斷完善的開放原始碼的JSP標籤庫,是由apache的jakarta小組來維護的。

配置application.yml支援jsp

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

編寫測試Controller

package cn.ylx.controller;

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

import java.util.Map;

@Controller
public class HelloController {

    @RequestMapping("/index")
    public String index(Map<String,Object> map){
        map.put("name", "Nancy");
        return "index";
    }

}

編寫JSP頁面

<%@ page language="java" contentType="text/html; charset=UTF-8"
         pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>Insert title here</title>
</head>
<body>
    <h2>Hello ${name} </h2>
</body>
</html>

測試:能成功取值。

注意

IDEA啟動該專案如果直接啟動啟動項,瀏覽器輸入 http://localhost:8080/index ,會報錯:

There was an unexpected error (type=Not Found, status=404).
/WEB-INF/jsp/index.jsp

使用右側的外掛啟動就不會報錯:
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