spring boot项目打包成可执行jar包后, 无法访问jsp时, 可以从以下几个方面进行排查解决:

1.打包jsp等资源文件, pom.xml需要配置以下内容:

<build>
..............
        <resources>
            <!-- 打包时将jsp文件拷贝到META-INF目录下 -->
            <resource>
                <!-- 指定resources插件处理哪个目录下的资源文件 -->
                <directory>src/main/webapp</directory>
                <!--注意此次必须要放在此目录下才能被访问到 -->
                <targetPath>META-INF/resources</targetPath>
                <includes>
                    <include>**/**</include>
                </includes>
                <filtering>false</filtering>
            </resource>
            <resource>
                <!-- 指定resources插件处理哪个目录下的资源文件 -->
                <directory>src/main/resources</directory>
                <includes>
                    <include>**/**</include>
                </includes>
                <filtering>false</filtering>
            </resource>
        </resources>
    </build>

2.指定spring-boot-maven-plugin版本为1.4.2.RELEASE(注意，这个必须指定否则无法正常打包且无法解决404问题):

            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <version>1.4.2.RELEASE</version>
                <configuration>
                  <mainClass>start.Application</mainClass>
                </configuration>
            </plugin>

3.添加jstl、servlet、tomcat-embed-jasper依赖：

        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
            <scope>provided</scope>
		</dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>org.apache.tomcat.embed</groupId>
            <artifactId>tomcat-embed-jasper</artifactId>
            <scope>provided</scope>
        </dependency>