只有第一个请求映射解析Java Spring Boot（圆形视图路径）答案

【问题标题】：Only first request mapping resolves Java Spring Boot (circular view path)只有第一个请求映射解析Java Spring Boot（圆形视图路径）
【发布时间】：2017-05-05 20:45:43
【问题描述】：

我正在尝试在我的 Spring Boot 应用程序中映射多个请求路径。这是一个 RESTful Web 服务，但我希望用户界面有两个视图（main 和 help）。我尝试调整返回字符串的名称（即从“help.html”到“help”），以及清理我的项目和重建，但我不明白为什么一个视图解析而另一个视图没有并返回一个循环路径。我还尝试创建一个单独的 HelpController 并将其映射到那里。我看不出两者之间有什么不同。

这是我的 MainController.java：

   @Controller
public class MainController {

    @RequestMapping(value = "/help", method = RequestMethod.GET)
    public String help(){
        System.out.println("GET called on help page");
        return "help.html";
    }

    @RequestMapping(value = "/main", method = RequestMethod.GET)
    public String landing(){
        System.out.println("GET called on index page");
        return "landing.html";
    }
}

我的 App.java：

@SpringBootApplication
@EnableAutoConfiguration(exclude = {DataSourceAutoConfiguration.class, HibernateJpaAutoConfiguration.class})
public class App {

//    private static final Logger logger = Logger.getLogger(App.class.toString());

    public static void main(String[] args){
        SpringApplication.run(App.class, args);
    }
}

我把我的两个html模板放在resources/static目录下：

但这两条路径中只有一条正确解析。 main.html 看起来很棒：

但是 help.html 有一个我无法解析或理解的循环引用：

这是我的 pom.xml（出于隐私考虑，省略了某些标签）：

  <build>

    <sourceDirectory>src</sourceDirectory>
    <plugins>
      <plugin>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.5.1</version>
        <configuration>
          <source>1.8</source>
          <target>1.8</target>
        </configuration>
      </plugin>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
            <version>1.5.2.RELEASE</version>
            <executions>
                <execution>
                    <goals>
                        <goal>repackage</goal>
                    </goals>
                </execution>
            </executions>
        </plugin>
      <plugin>
        <artifactId>maven-war-plugin</artifactId>
        <version>3.0.0</version>
        <configuration>
          <warSourceDirectory>WebContent</warSourceDirectory>
        </configuration>
      </plugin>
    </plugins>
  </build>
    <repositories>
        <repository>
            <id>dynamodb-local-oregon</id>
            <name>DynamoDB Local Release Repository</name>
            <url>https://s3-us-west-2.amazonaws.com/dynamodb-local/release</url>
        </repository>
    </repositories>

  <parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.5.2.RELEASE</version>
  </parent>

  <dependencies>
      <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-web -->
      <dependency>
          <groupId>org.springframework.boot</groupId>
          <artifactId>spring-boot-starter-web</artifactId>
          <version>1.5.2.RELEASE</version>
      </dependency>
      <!-- https://mvnrepository.com/artifact/com.github.derjust/spring-data-dynamodb -->
      <dependency>
          <groupId>com.github.derjust</groupId>
          <artifactId>spring-data-dynamodb</artifactId>
          <version>4.5.0</version>
      </dependency>
      <!-- https://mvnrepository.com/artifact/com.amazonaws/aws-java-sdk-dynamodb -->
      <dependency>
          <groupId>com.amazonaws</groupId>
          <artifactId>aws-java-sdk-dynamodb</artifactId>
          <version>1.11.125</version>
      </dependency>
      <dependency>
          <groupId>org.springframework.data</groupId>
          <artifactId>spring-data-releasetrain</artifactId>
          <version>Gosling-SR1</version>
          <type>pom</type>
          <scope>import</scope>
      </dependency>
      <dependency>
          <groupId>com.amazonaws</groupId>
          <artifactId>aws-java-sdk-bom</artifactId>
          <version>${aws-java-sdk.version}</version>
          <type>pom</type>
          <scope>import</scope>
      </dependency>
      <dependency>
          <groupId>org.springframework.boot</groupId>
          <artifactId>spring-boot-starter-tomcat</artifactId>
          <version>1.5.2.RELEASE</version>
      </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context</artifactId>
      <version>4.3.7.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-core</artifactId>
      <version>4.3.7.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-web</artifactId>
      <version>4.3.4.RELEASE</version>
    </dependency>
      <dependency>
          <groupId>org.springframework.boot</groupId>
          <artifactId>spring-boot-starter-data-jpa</artifactId>
          <exclusions>
              <exclusion>
                  <groupId>org.hibernate</groupId>
                  <artifactId>hibernate-entitymanager</artifactId>
              </exclusion>
          </exclusions>
      </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>4.3.4.RELEASE</version>
    </dependency>
      <dependency>
          <groupId>javax.servlet</groupId>
          <artifactId>javax.servlet-api</artifactId>
          <version>3.0.1</version>
          <scope>provided</scope>
      </dependency>
    <dependency>
      <groupId>jstl</groupId>
      <artifactId>jstl</artifactId>
      <version>1.2</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-beans</artifactId>
      <version>4.3.7.RELEASE</version>
    </dependency>
      <dependency>
          <groupId>org.springframework</groupId>
          <artifactId>spring-web</artifactId>
          <version>4.3.4.RELEASE</version>
      </dependency>
      <dependency>
          <groupId>org.springframework</groupId>
          <artifactId>spring-web</artifactId>
          <version>4.3.3.RELEASE</version>
      </dependency>
      <dependency>
          <groupId>com.fasterxml.jackson.core</groupId>
          <artifactId>jackson-databind</artifactId>
          <version>${jackson.version}</version>
      </dependency>
      <dependency>
          <groupId>javax.servlet</groupId>
          <artifactId>javax.servlet-api</artifactId>
          <version>3.0.1</version>
          <scope>provided</scope>
      </dependency>
      <dependency>
          <groupId>com.amazonaws</groupId>
          <artifactId>DynamoDBLocal</artifactId>
          <version>${aws.dynamodblocal.version}</version>
      </dependency>
  </dependencies>
</project>

【问题讨论】：

标签： spring spring-mvc spring-boot

【解决方案1】：

解决问题的最简单方法是将映射从 /help 更改为其他内容，或将静态文件重命名为 help.html。

循环依赖的原因是视图名称help.html 将再次映射到您的控制器。 Spring MVC 默认使用后缀来确定响应的mimetype，这意味着映射到/help 的方法也会拦截/help.html 请求

【讨论】：