Spring Boot WhiteLabel错误页面(Spring 4.0)

时间:2018-12-08 02:27:16

标签: spring spring-mvc spring-boot

几年前问过的几乎相同的问题,但无济于事,我想是时候在这里问了。

为什么我的小组看到此Whilelabel错误页面? -> (https://i.imgur.com/hGd61Qr.png

文件结构图1:https://i.imgur.com/x5Jn4gP.png

文件结构图2:https://i.imgur.com/K8gP59y.png

文件结构图3:https://i.imgur.com/JFFEidy.png

似乎我们具有Spring喜欢的一般结构,主应用程序位于所有其他控制器等之上。

MainApp类:     包com.example;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ComponentScan;


@SpringBootApplication(scanBasePackages = {"com.example.demo", 
"com.example.demo.domain", "com.example.demo.dao", 
"com.example.demo.service"})
@ComponentScan("com.example.demo.domain.Book_CopiesMapper")
public class MySpringBootApplication {

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

我们必须拥有那个ComponentScan,否则我们会收到此错误: https://i.imgur.com/BKDwHyn.png

控制器类:

package com.example.demo;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

import com.example.demo.domain.Borrower;
import com.example.demo.domain.Employee;
import com.example.demo.service.BorrowerService;


@RestController
public class LoginController {

    @Autowired
    BorrowerService borrowerService;

    @GetMapping("/login")
    public String login() {
        System.out.println("hello from LoginController");
        return "login";
    }

    @GetMapping("/signup")
    public String signup() {
        return "signup";
    }

    @RequestMapping(value = "/registerUser", method = RequestMethod.POST)
    public String registerUser(@ModelAttribute Borrower borrower, Model model) {

        borrowerService.insertBorrower(borrower);
        model.addAttribute("message", "Success! You may now login with Card Number: " + borrower.getcardNo());

        return "registerUser";
    }
}

登录是一个简单的登录页面,注册是一种允许用户注册到我们的库的表单,registerUser用于连接到我们的Oracle SQL数据库并将用户插入到相应的表中(我们假设这是是正确的方法)

pom.xml:

<?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>com.example</groupId>
    <artifactId>MySpringBoot</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>MySpringBoot</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.0.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <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>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.3.2</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
        </dependency>

        <dependency>
            <groupId>com.oracle</groupId>
            <artifactId>ojdbc6</artifactId>
            <version>11.2.0.3</version>
        </dependency>


    </dependencies>

  <repositories>
        <repository>
            <id>codelds</id>
            <url>https://code.lds.org/nexus/content/groups/main-repo</url>
        </repository>
    </repositories>



    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>


</project>

application.properties:

#spring.autoconfigure.exclude=org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration
spring.thymeleaf.cache = false

#mybatis
mybatis.type-aliases-package=com.example.demo.domain

spring.datasource.url = jdbc:oracle:thin:@dataserv.mscs.mu.edu:1521:orcl
spring.datasource.username = 
spring.datasource.password = 
spring.datasource.driver-class-name = oracle.jdbc.driver.OracleDriver

出于明显的原因,省略了数据库的用户名和密码。

如果任何人都可以提供反馈,我们将不胜感激!评论人们是否希望我发布其他图片或文件。

谢谢!

编辑:我们使用的路径是localhost:8080 / login或localhost:8080 / signup。目前看来,我们采取的任何路径都会导致此错误

此外,我们所有的DAO类都将@Autowired标记用于我们使用的任何服务,并且类似地,我们@Autowire使用其他类(例如Service包中的DAO)中需要的其他任何东西。抱歉,这句话有点含糊

1 个答案:

答案 0 :(得分:0)

问题是因为您正在使用@RestController,并且默认情况下您正在发送视图,其余控制器发送的消息将返回域对象/ pojo而不是视图,请用@Controller替换它。希望对您有所帮助。