springboot之集成jsp(springMVC)

1、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

---

2、新建SpringInitialzr

---

3、pom文件

< 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 >
            < scope >provided scope >
        dependency >
        < dependency >
            < groupId >org.apache.tomcat.embed groupId >
            < artifactId >tomcat-embed-jasper artifactId >
        dependency >
        < dependency >
            < groupId >org.springframework.boot groupId >
            < artifactId >spring-boot-starter-test artifactId >
            < scope >test scope >
        dependency >
    dependencies >

---

4、application.properties文件

# 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=Hello GOD

---

5、Controller文件

package  com.example;

import  org.springframework.beans.factory.annotation.Value;
import  org.springframework.stereotype.Controller;
import  org.springframework.web.bind.annotation.RequestMapping;

import  java.util.Map;

/**
 * on 2016/9/9.
 */
@Controller

public  class  HelloController {

    // 从 application.properties 中读取配置，如取不到默认值为Hello
    @Value ( "${application.hello:Hello}" )
    private  String hello;


    @RequestMapping ( "/helloJsp" )
    public  String helloJsp(Map map) {
        System.out.println( "HelloController.helloJsp().hello="  + hello);
        map.put( "hello" , hello);
        return  "helloJsp" ;

    }

}

---

6、jsp页面

<%@ page language="java" contentType="text/html; charset=UTF-8"pageEncoding="UTF-8" %>

< html >
< head >< meta  http-equiv = "Content-Type"  content = "text/html; charset=UTF-8" >< title >GOD title > head >
< body >
helloJsp
< hr >
${hello}
body >
html >

---

7、遇到的问题

1、Spring Boot: Unable to start EmbeddedWebApplicationContext due to missing EmbeddedServletContainerFactory bean

把pom中所有的provided注释掉

2、报404

<1>注意controller和restcontroller区别

<2>检查application.properties

<3>检查pom是否缺支持jsp包

3、Failed to introspect annotated methods on class org.springframework.boot.web.support.SpringBootServletInitializer

org.springframework.beans.factory.BeanDefinitionStoreException: Failed to parse configuration  class  [com.example.SampleWebJspApplication]; nested exception is java.lang.IllegalStateException: Failed to introspect annotated methods on  class  org.springframework.boot.web.support.SpringBootServletInitializer
    at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java: 187 ) ~[spring-context- 4.3 . 2 .RELEASE.jar: 4.3 . 2 .RELEASE]
    at org.springframework.context.annotation.ConfigurationClassPostProcessor.processConfigBeanDefinitions(ConfigurationClassPostProcessor.java: 321 ) ~[spring-context- 4.3 . 2 .RELEASE.jar: 4.3 . 2 .RELEASE]
    at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanDefinitionRegistry(ConfigurationClassPostProcessor.java: 243 ) ~[spring-context- 4.3 . 2 .RELEASE.jar: 4.3 . 2 .RELEASE]
    at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanDefinitionRegistryPostProcessors(PostProcessorRegistrationDelegate.java: 273 ) ~[spring-context- 4.3 . 2 .RELEASE.jar: 4.3 . 2 .RELEASE]
    at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java: 98 ) ~[spring-context- 4.3 . 2 .RELEASE.jar: 4.3 . 2 .RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java: 681 ) ~[spring-context- 4.3 . 2 .RELEASE.jar: 4.3 . 2 .RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java: 523 ) ~[spring-context- 4.3 . 2 .RELEASE.jar: 4.3 . 2 .RELEASE]
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java: 759 ) [spring-boot- 1.4 . 0 .RELEASE.jar: 1.4 . 0 .RELEASE]
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java: 369 ) [spring-boot- 1.4 . 0 .RELEASE.jar: 1.4 . 0 .RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java: 313 ) [spring-boot- 1.4 . 0 .RELEASE.jar: 1.4 . 0 .RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java: 1185 ) [spring-boot- 1.4 . 0 .RELEASE.jar: 1.4 . 0 .RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java: 1174 ) [spring-boot- 1.4 . 0 .RELEASE.jar: 1.4 . 0 .RELEASE]
    at com.example.SampleWebJspApplication.main(SampleWebJspApplication.java: 20 ) [classes/:na]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na: 1.8 .0_77]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java: 62 ) ~[na: 1.8 .0_77]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java: 43 ) ~[na: 1.8 .0_77]
    at java.lang.reflect.Method.invoke(Method.java: 498 ) ~[na: 1.8 .0_77]
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java: 147 ) [idea_rt.jar:na]
Caused by: java.lang.IllegalStateException: Failed to introspect annotated methods on  class  org.springframework.boot.web.support.SpringBootServletInitializer
    at org.springframework.core.type.StandardAnnotationMetadata.getAnnotatedMethods(StandardAnnotationMetadata.java: 163 ) ~[spring-core- 4.3 . 2 .RELEASE.jar: 4.3 . 2 .RELEASE]
    at org.springframework.context.annotation.ConfigurationClassParser.doProcessConfigurationClass(ConfigurationClassParser.java: 301 ) ~[spring-context- 4.3 . 2 .RELEASE.jar: 4.3 . 2 .RELEASE]
    at org.springframework.context.annotation.ConfigurationClassParser.processConfigurationClass(ConfigurationClassParser.java: 237 ) ~[spring-context- 4.3 . 2 .RELEASE.jar: 4.3 . 2 .RELEASE]
    at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java: 204 ) ~[spring-context- 4.3 . 2 .RELEASE.jar: 4.3 . 2 .RELEASE]
    at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java: 173 ) ~[spring-context- 4.3 . 2 .RELEASE.jar: 4.3 . 2 .RELEASE]
    ...  17  common frames omitted

解决方案：添加以下依赖

 < dependency >
            < groupId >org.apache.tomcat.embed groupId >
            < artifactId >tomcat-embed-jasper artifactId >
        dependency >

4、java.lang.NoClassDefFoundError: javax/servlet/ServletContext

Caused by: java.lang.NoClassDefFoundError: javax/servlet/ServletContext
    at java.lang.Class.getDeclaredMethods0(Native Method) ~[na: 1.8 .0_77]
    at java.lang.Class.privateGetDeclaredMethods(Class.java: 2701 ) ~[na: 1.8 .0_77]
    at java.lang.Class.getDeclaredMethods(Class.java: 1975 ) ~[na: 1.8 .0_77]
    at org.springframework.core.type.StandardAnnotationMetadata.getAnnotatedMethods(StandardAnnotationMetadata.java: 152 ) ~[spring-core- 4.3 . 2 .RELEASE.jar: 4.3 . 2 .RELEASE]
    ...  21  common frames omitted
Caused by: java.lang.ClassNotFoundException: javax.servlet.ServletContext
    at java.net.URLClassLoader.findClass(URLClassLoader.java: 381 ) ~[na: 1.8 .0_77]
    at java.lang.ClassLoader.loadClass(ClassLoader.java: 424 ) ~[na: 1.8 .0_77]
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java: 331 ) ~[na: 1.8 .0_77]
    at java.lang.ClassLoader.loadClass(ClassLoader.java: 357 ) ~[na: 1.8 .0_77]
    ...  25  common frames omitted

解决方案：添加

< dependency >
            < groupId >javax.servlet groupId >
            < artifactId >javax.servlet-api artifactId >
        dependency >
        < dependency >
            < groupId >javax.servlet groupId >
            < artifactId >jstl artifactId >
        dependency >

删除其他依赖中的provided