春季启动银行项目：登录页面不显示

时间：2017-12-11 09:53:46

标签： java spring spring-boot

我正在创建一个登录页面，允许用户登录。但是，当我尝试通过谷歌浏览器访问http://localhost:8080/index时，我只看到“索引”，没有别的。但它应该显示我使用HTML和Bootstrap创建的登录页面。

以下是HomeController.java的代码

package com.userFront.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

@Controller
public class HomeController {

    @RequestMapping("/")
    public String home() {
        return "redirect:/index";
    }

    @RequestMapping("/index")
    public @ResponseBody String index() {
        return "index";
    }

}

您可以在此处找到所有项目文件： https://drive.google.com/open?id=1fxTWDo_3_iaS4zaav60KaT9OvB-kSjv6

更新：1 我被建议从方法索引（）中删除@ResponseBody。但是当我这样做时，会出现以下问题：

Whitelabel Error Page
This application has no explicit mapping for /error, so you are seeing this as a fallback.

Mon Dec 11 17:52:53 
There was an unexpected error (type=Internal Server Error, status=500).
Circular view path [index]: would dispatch back to the current handler URL [/index] again. Check your ViewResolver setup! (Hint: This may be the result of an unspecified view, due to default view name generation.)

更新2： 这是HomeController类的最新版本，我根据我从@vtx收到的建议进行了修改：

package com.userFront.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

    @Controller
    public class HomeController {

        @RequestMapping("/")
        public String home() {
            return "redirect:/index";
        }

        @RequestMapping("/welcome")
        public String index() {
            return "index";
        }

    }

但是现在，出现了一个新错误，其中包含：

Whitelabel Error Page
This application has no explicit mapping for /error, so you are seeing this as a fallback.

Mon Dec 11 18:52:41 
There was an unexpected error (type=Not Found, status=404).
No message available

更新3：正如@vtx所建议的那样，我试图清理安装Maven。但是，会发生以下错误：

[INFO] Scanning for projects...
[INFO]                                                                         
[INFO] ------------------------------------------------------------------------
[INFO] Building UserFront 0.0.1-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO] 
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ userFront ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 1 resource
[INFO] Copying 30 resources
[INFO] 
[INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ userFront ---
[INFO] Changes detected - recompiling the module!
[INFO] Compiling 9 source files to C:\Users\Kanon\eclipse-workspace\UserFront\target\classes
[INFO] -------------------------------------------------------------
[ERROR] COMPILATION ERROR : 
[INFO] -------------------------------------------------------------
[ERROR] No compiler is provided in this environment. Perhaps you are running on a JRE rather than a JDK?
[INFO] 1 error
[INFO] -------------------------------------------------------------
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 1.606 s
[INFO] Finished at: 2017-12-11T23:31:14+06:00
[INFO] Final Memory: 18M/227M
[INFO] ------------------------------------------------------------------------
[WARNING] The requested profile "pom.xml" could not be activated because it does not exist.
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project userFront: Compilation failure
[ERROR] No compiler is provided in this environment. Perhaps you are running on a JRE rather than a JDK?
[ERROR] -> [Help 1]
[ERROR] 
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR] 
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException

更新4：根据@vtx的建议，我已经完成了Maven的干净安装。
我关注了stackoverflow.com/questions/19655184 / ...和stackoverflow.com/questions/19655184 / ... Maven安装干净，没有任何错误。但是现在，我得到了“循环视图路径”错误。

更新5： @vtx建议我再次使用以下代码：

package com.userFront.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

    @Controller
    public class HomeController {

        @RequestMapping("/")
        public String home() {
            return "redirect:/index";
        }

        @RequestMapping("/welcome")
        public String index() {
            return "index";
        }

    }

但是再一次，我收到以下错误：

Whitelabel Error Page
This application has no explicit mapping for /error, so you are seeing this as a fallback.

Tue Dec 12 00:27:42 
There was an unexpected error (type=Not Found, status=404).
No message available

令人难以置信的沮丧。但我不会放弃！

2 个答案:

答案 0 :(得分：0)

@ResponseBody注释告诉控制器返回的对象会自动序列化为JSON并传回HttpResponse对象。

您应该删除@ResponseBody 

@RequestMapping("/index")
    public String index() {
        return "index";
    }

我能够通过上述更改成功运行您的代码，我没有遇到任何循环路径错误或404.

<强>证明 

@Controller
public class HomeController {

    @RequestMapping("/")
    public String home() {
        return "redirect:/index";
    }

    @RequestMapping("/index")
    public  String index() {
        return "index";
    }

}

enter image description here 

017-12-11 21:15:07.835  INFO 4840 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean  : Mapping servlet: 'dispatcherServlet' to [/]
2017-12-11 21:15:07.843  INFO 4840 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'characterEncodingFilter' to: [/*]
2017-12-11 21:15:07.843  INFO 4840 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2017-12-11 21:15:07.844  INFO 4840 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'httpPutFormContentFilter' to: [/*]
2017-12-11 21:15:07.844  INFO 4840 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'requestContextFilter' to: [/*]
2017-12-11 21:15:08.311  INFO 4840 --- [           main] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for @ControllerAdvice: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@6c9f5c0d: startup date [Mon Dec 11 21:15:04 IST 2017]; root of context hierarchy
2017-12-11 21:15:08.409  INFO 4840 --- [           main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/index]}" onto public java.lang.String com.userFront.controller.HomeController.index()
2017-12-11 21:15:08.410  INFO 4840 --- [           main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/]}" onto public java.lang.String com.userFront.controller.HomeController.home()
2017-12-11 21:15:08.416  INFO 4840 --- [           main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error]}" onto public org.springframework.http.ResponseEntity<java.util.Map<java.lang.String, java.lang.Object>> org.springframework.boot.autoconfigure.web.BasicErrorController.error(javax.servlet.http.HttpServletRequest)
2017-12-11 21:15:08.416  INFO 4840 --- [           main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error],produces=[text/html]}" onto public org.springframework.web.servlet.ModelAndView org.springframework.boot.autoconfigure.web.BasicErrorController.errorHtml(javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse)
2017-12-11 21:15:08.464  INFO 4840 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2017-12-11 21:15:08.464  INFO 4840 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2017-12-11 21:15:08.516  INFO 4840 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]

请执行mvn clean install。希望能有所帮助

答案 1 :(得分：0)

我看着你最后的更改，看到你重定向到索引，但你没有映射＆＃34; / index＆＃34;。 也许你应该这样做

 @RequestMapping("/")
    public String home() {
        return "redirect:/welcome";
    }

    @RequestMapping("/welcome")
    public String index() {
        return "index";
    }

它会起作用，但看起来不是逻辑。 只需写下

@RequestMapping("/")
    public String home() {
        return "index";
    }

这就是返回索引页面的全部内容。 确保你已将index.html页面设置为src / main / resources / static文件夹如果你没有更改默认配置，那么spring boot会看到那里

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