如何获取用户 Object 的 HTML 表单数据 | Spring 开机 | Controller |

Question

我正在尝试创建一个简单的 Web 应用程序来注册用户。 我遇到了一个问题，我无法在我的 controller 方法中从 HTML 表格中获取数据。 我尝试了很多东西但徒劳无功

主class：

 package main; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.context.annotation.ComponentScan; @ComponentScan @SpringBootApplication public class Web1Application { public static void main(String[] args) { SpringApplication.run(Web1Application.class, args); } }

这是我的 controller class：

Controller class

 package main.controller; import org.springframework.stereotype.Component; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.servlet.ModelAndView; import main.models.Test; @Component @Controller public class WebController { @RequestMapping("/register") public ModelAndView getRegistrationPage() { ModelAndView mv = new ModelAndView(); mv.setViewName("register.jsp"); return mv; } @RequestMapping("/saveuser") public void handle(Test user) { System.out.println(user); } }

这是我的测试 class 我正在使用其他一些 class 但正在测试..

实体 class

 package main.models; import javax.persistence.Entity; import javax.persistence.Id; import org.springframework.stereotype.Component; @Component @Entity public class Test { @Id private int id; private String name; private String username; private String password; //getters + setters + toString }

这是我的 html 表单标签。 我在 jasper 文件中使用此代码。

注册 HTML 文件

 <form action="/saveuser" method="post"> <label for="id">Name: </label> <input type="number" name="id"> <label for="name">Name: </label> <input type="text" name="name"> <label for="username">User Name: </label> <input type="text" name="username"> <label for="password">Password: </label> <input type="password" name="password"> <input type="submit" name="submit" value="Submit"> </form>

POM 依赖项

 <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-jpa</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-security</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.apache.tomcat</groupId> <artifactId>tomcat-jasper</artifactId> <version>9.0.35</version> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <scope>runtime</scope> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> <exclusions> <exclusion> <groupId>org.junit.vintage</groupId> <artifactId>junit-vintage-engine</artifactId> </exclusion> </exclusions> </dependency> <dependency> <groupId>org.springframework.security</groupId> <artifactId>spring-security-test</artifactId> <scope>test</scope> </dependency> </dependencies>

Eclipse IDE 控制台日志

 2020-06-03 12:15:46.301 INFO 8260 --- [ main] main.Web1Application: Starting Web1Application on DESKTOP-1FI2H1T with PID 8260 (C:\Users\Pancham Goyal\git\Web-Repository\Web-1\target\classes started by Pancham Goyal in C:\Users\Pancham Goyal\git\Web-Repository\Web-1) 2020-06-03 12:15:46.306 INFO 8260 --- [ main] main.Web1Application: No active profile set, falling back to default profiles: default 2020-06-03 12:15:47.455 INFO 8260 --- [ main].sdr.c.RepositoryConfigurationDelegate: Bootstrapping Spring Data JPA repositories in DEFERRED mode. 2020-06-03 12:15:47.555 INFO 8260 --- [ main].sdr.c.RepositoryConfigurationDelegate: Finished Spring Data repository scanning in 87ms. Found 1 JPA repository interfaces. 2020-06-03 12:15:48.376 INFO 8260 --- [ main] osbwembedded.tomcat.TomcatWebServer: Tomcat initialized with port(s): 8080 (http) 2020-06-03 12:15:48.389 INFO 8260 --- [ main] o.apache.catalina.core.StandardService: Starting service [Tomcat] 2020-06-03 12:15:48.389 INFO 8260 --- [ main] org.apache.catalina.core.StandardEngine: Starting Servlet engine: [Apache Tomcat/9.0.35] 2020-06-03 12:15:48.801 INFO 8260 --- [ main] org.apache.jasper.servlet.TldScanner: At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time. 2020-06-03 12:15:48.807 INFO 8260 --- [ main] oac.c.C.[Tomcat].[localhost].[/]: Initializing Spring embedded WebApplicationContext 2020-06-03 12:15:48.808 INFO 8260 --- [ main] osweb.context.ContextLoader: Root WebApplicationContext: initialization completed in 2436 ms Loading class `com.mysql.jdbc.Driver'. This is deprecated. The new driver class is `com.mysql.cj.jdbc.Driver'. The driver is automatically registered via the SPI and manual loading of the driver class is generally unnecessary. 2020-06-03 12:15:49.152 INFO 8260 --- [ main] ossconcurrent.ThreadPoolTaskExecutor: Initializing ExecutorService 'applicationTaskExecutor' 2020-06-03 12:15:49.214 INFO 8260 --- [ task-1] o.hibernate.jpa.internal.util.LogHelper: HHH000204: Processing PersistenceUnitInfo [name: default] 2020-06-03 12:15:49.261 WARN 8260 --- [ main] JpaBaseConfiguration$JpaWebConfiguration: spring.jpa.open-in-view is enabled by default. Therefore, database queries may be performed during view rendering. Explicitly configure spring.jpa.open-in-view to disable this warning 2020-06-03 12:15:49.302 INFO 8260 --- [ task-1] org.hibernate.Version: HHH000412: Hibernate ORM core version 5.4.15.Final 2020-06-03 12:15:49.538 INFO 8260 --- [ task-1] o.hibernate.annotations.common.Version: HCANN000001: Hibernate Commons Annotations {5.1.0.Final} 2020-06-03 12:15:49.547 INFO 8260 --- [ main] ossweb.DefaultSecurityFilterChain: Creating filter chain: any request, [org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter@7f92b990, org.springframework.security.web.context.SecurityContextPersistenceFilter@2f1ea80d, org.springframework.security.web.header.HeaderWriterFilter@34cf294c, org.springframework.security.web.csrf.CsrfFilter@4f4c789f, org.springframework.security.web.authentication.logout.LogoutFilter@c808207, org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter@778db7c5, org.springframework.security.web.savedrequest.RequestCacheAwareFilter@f1a45f8, org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter@1ffcf674, org.springframework.security.web.authentication.AnonymousAuthenticationFilter@31e04b13, org.springframework.security.web.session.SessionManagementFilter@604b1e1d, org.springframework.security.web.access.ExceptionTranslationFilter@21618fa7, org.springframework.security.web.access.intercept.FilterSecurityInterceptor@7a8136b3] 2020-06-03 12:15:49.840 INFO 8260 --- [ task-1] com.zaxxer.hikari.HikariDataSource: HikariPool-1 - Starting... 2020-06-03 12:15:49.841 WARN 8260 --- [ task-1] com.zaxxer.hikari.util.DriverDataSource: Registered driver with driverClassName=com.mysql.jdbc.Driver was not found, trying direct instantiation. 2020-06-03 12:15:50.030 INFO 8260 --- [ task-1] com.zaxxer.hikari.HikariDataSource: HikariPool-1 - Start completed. 2020-06-03 12:15:50.049 INFO 8260 --- [ task-1] org.hibernate.dialect.Dialect: HHH000400: Using dialect: org.hibernate.dialect.MySQL5Dialect 2020-06-03 12:15:51.001 INFO 8260 --- [ task-1] ohetjpiJtaPlatformInitiator: HHH000490: Using JtaPlatform implementation: [org.hibernate.engine.transaction.jta.platform.internal.NoJtaPlatform] 2020-06-03 12:15:51.013 INFO 8260 --- [ task-1] j.LocalContainerEntityManagerFactoryBean: Initialized JPA EntityManagerFactory for persistence unit 'default' 2020-06-03 12:15:51.815 INFO 8260 --- [ main] osbwembedded.tomcat.TomcatWebServer: Tomcat started on port(s): 8080 (http) with context path '' 2020-06-03 12:15:51.817 INFO 8260 --- [ main] DeferredRepositoryInitializationListener: Triggering deferred initialization of Spring Data repositories… 2020-06-03 12:15:51.917 INFO 8260 --- [ main] DeferredRepositoryInitializationListener: Spring Data repositories initialized: 2020-06-03 12:15.51.932 INFO 8260 --- [ main] main:Web1Application. Started Web1Application in 6.27 seconds (JVM running for 8.203)

在页面上提交表单后，我在屏幕上收到此白色 label 错误错误提交后按

chrome上的错误提交后

文件模式

谢谢你：）

Answer 1

我没有在 controller 上使用 POST，这就是我收到此错误并且还有许多其他错误的原因。 谢谢！