按照指南配置了Spring Boot,仍然找不到我的jsp视图。因此,启动后我收到此消息“此应用程序没有 /error 的显式映射,因此您将其视为后备。”
有什么建议吗?
pom:
<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.7.5</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.lib.secondtry</groupId>
<artifactId>MyLibrary</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>MyLibrary</name>
<description>MyLibrary</description>
<properties>
<java.version>11</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.apache.tomcat.embed</groupId>
<artifactId>tomcat-embed-jasper</artifactId>
<version>9.0.44</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
<dependency>
<groupId>org.apache.tomcat.embed</groupId>
<artifactId>tomcat-embed-jasper</artifactId>
<version>9.0.44</version>
<scope>provided</scope>
</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-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
<optional>true</optional>
</dependency>
<dependency>
<groupId>com.mysql</groupId>
<artifactId>mysql-connector-j</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
特性:
spring.mvc.view.prefix=/webapp/WEB-INF/jsp/
spring.mvc.view.suffix=.jsp
控制器:
@Controller
public class FirstController {
@GetMapping("/")
public String sayHello(){
return "hello";
}
}
控制台:
2022-11-15 23:09:26.879 INFO 11896 --- [ restartedMain] c.l.s.mylibrary.MyLibraryApplication : No active profile set, falling back to 1 default profile: "default"
2022-11-15 23:09:26.907 INFO 11896 --- [ restartedMain] .e.DevToolsPropertyDefaultsPostProcessor : Devtools property defaults active! Set 'spring.devtools.add-properties' to 'false' to disable
2022-11-15 23:09:26.908 INFO 11896 --- [ restartedMain] .e.DevToolsPropertyDefaultsPostProcessor : For additional web related logging consider setting the 'logging.level.web' property to 'DEBUG'
2022-11-15 23:09:27.369 INFO 11896 --- [ restartedMain] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
2022-11-15 23:09:27.374 INFO 11896 --- [ restartedMain] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2022-11-15 23:09:27.375 INFO 11896 --- [ restartedMain] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.68]
2022-11-15 23:09:27.495 INFO 11896 --- [ restartedMain] org.apache.jasper.servlet.TldScanner : At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.
2022-11-15 23:09:27.500 INFO 11896 --- [ restartedMain] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2022-11-15 23:09:27.501 INFO 11896 --- [ restartedMain] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 593 ms
2022-11-15 23:09:27.663 INFO 11896 --- [ restartedMain] o.s.b.d.a.OptionalLiveReloadServer : LiveReload server is running on port 35729
2022-11-15 23:09:27.694 INFO 11896 --- [ restartedMain] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path ''
2022-11-15 23:09:27.700 INFO 11896 --- [ restartedMain] c.l.s.mylibrary.MyLibraryApplication : Started MyLibraryApplication in 1.008 seconds (JVM running for 1.342)
2022-11-15 23:09:43.705 INFO 11896 --- [nio-8080-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring DispatcherServlet 'dispatcherServlet'
2022-11-15 23:09:43.705 INFO 11896 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : Initializing Servlet 'dispatcherServlet'
2022-11-15 23:09:43.706 INFO 11896 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : Completed initialization in 1 ms
在 main 中我创建了 webapp/WEB-INF/jsp/ 但没有帮助。
在maven中(如果省略)默认打包是运行使用嵌入式 servlet 容器(并打包为可执行存档)的 Spring Boot 应用程序时,JSP 支持存在一些限制。
对于 Jetty 和 Tomcat,如果您使用
包装,它应该可以工作。可执行的 war 在使用war
启动时可以工作,并且也可以部署到任何标准容器。 使用可执行 jar 时不支持 JSP。java -jar
- Undertow 不支持 JSP。
- 创建自定义
error.jsp
页面不会覆盖错误处理的默认视图。应改用自定义错误页面。
jar
,所以请添加:
pom.xml
:
<project>
...
<packaging>war</packaging>
...
build.gradle
:
plugins {
...
id 'war'
...
}
spring-boot-starter-tomcat
设置为
prvoided
范围(即将其从打包中排除/准备外部部署))
还请注意“提示”
如果可能,应避免 JSP 我能够使用https://stackoverflow.com/a/50846032/2137125
的一部分)让 JSP 与可执行 JAR 一起使用,以及https://dzone.com/articles/spring-boot-with-jsps-in-executable-jars-1.
但正如第一个链接中的其他答案所说,支持的方式似乎是使用可执行的战争,即你可以java -jar something.war
,虽然我没有尝试过,也许是因为我很固执。
编辑 2024:我已经从 JAR 上的 JSP 迁移出来,因为我们开始随机页面未加载,每次重新启动后页面都会更改,或者有时没有页面会受到影响。
尝试将您的
.properties
spring.mvc.view.prefix=/WEB-INF/jsp/
spring.mvc.view.suffix=.jsp