在SPRING BOOT中查看解析器设置问题

Question

控制台中显示错误：

  

在路径为[]的上下文中，用于servlet [dispatcherServlet]的Servlet.service（）抛出异常

     

[圆形视图路径[登录]：将调度   再次返回到当前处理程序URL [/ login]。

     

检查您的   ViewResolver设置！ （提示：这可能是由于未指定   视图，原因是默认视图名称生成。）]根本原因

AND

  

圆形视图路径[登录]：将分派回当前处理程序   再次输入网址[/ login]。检查您的ViewResolver设置！ （提示：这可能是   由于默认视图名称，未指定视图的结果   

配置文件：

WebMvcConfig.java

package com.BasicWebMVC;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

@Configuration
public class WebMvcConfig implements WebMvcConfigurer{
    @Bean
    public BCryptPasswordEncoder passwordEncoder() {
        BCryptPasswordEncoder bCryptPasswordEncoder = new BCryptPasswordEncoder();
        return bCryptPasswordEncoder;
    }


}

SecurityConfiguration.java

package com.BasicWebMVC;

import javax.sql.DataSource;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.builders.WebSecurity;
import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.security.web.util.matcher.AntPathRequestMatcher;

@Configuration
@EnableWebSecurity
public class SecurityConfiguration extends WebSecurityConfigurerAdapter {

    @Autowired
    private BCryptPasswordEncoder bCryptPasswordEncoder;



    @Autowired
    private DataSource dataSource;

    @Value("${spring.queries.users-query}")
    private String usersQuery;

    @Value("${spring.queries.roles-query}")
    private String rolesQuery;

    @Override
    protected void configure(AuthenticationManagerBuilder auth) throws Exception {
        auth.jdbcAuthentication().usersByUsernameQuery(usersQuery).authoritiesByUsernameQuery(rolesQuery)
                .dataSource(dataSource).passwordEncoder(bCryptPasswordEncoder);
    }

    @Override
    protected void configure(HttpSecurity http) throws Exception {

        http.authorizeRequests()
                // URLs matching for access rights
                .antMatchers("/").permitAll()
                .antMatchers("/login").permitAll()
                .antMatchers("/register").permitAll()
                .antMatchers("/home/**").hasAnyAuthority("SUPER_USER", "ADMIN_USER", "SITE_USER")
                .anyRequest().authenticated()
                .and()
                // form login
                .csrf().disable().formLogin()
                .loginPage("/login")
                .failureUrl("/login?error=true")
                .defaultSuccessUrl("/home")
                .usernameParameter("email")
                .passwordParameter("password")
                .and()
                // logout
                .logout()
                .logoutRequestMatcher(new AntPathRequestMatcher("/logout"))
                .logoutSuccessUrl("/").and()
                .exceptionHandling()
                .accessDeniedPage("/access-denied");
    }

    @Override
    public void configure(WebSecurity web) throws Exception {
        web.ignoring().antMatchers("/resources/**", "/static/**", "/css/**", "/js/**", "/images/**");
    }

}

控制器：

AuthenticationController.java

package com.BasicWebMVC.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.ModelAndView;

import com.BasicWebMVC.model.User;

@Controller
public class AuthenticationController {

    @RequestMapping(value = { "/login" }, method = RequestMethod.GET)
    public ModelAndView login() {
        ModelAndView modelAndView = new ModelAndView();
        modelAndView.setViewName("login"); // resources/template/login.html
        return modelAndView;
    }

    @RequestMapping(value = "/register", method = RequestMethod.GET)
    public ModelAndView register() {
        ModelAndView modelAndView = new ModelAndView();
        // User user = new User();
        // modelAndView.addObject("user", user); 
        modelAndView.setViewName("register"); // resources/template/register.html
        return modelAndView;
    }

    @RequestMapping(value = "/home", method = RequestMethod.GET)
    public ModelAndView home() {
        ModelAndView modelAndView = new ModelAndView();
        modelAndView.setViewName("home"); // resources/template/home.html
        return modelAndView;
    }
}

应用程序属性

# Database Details
spring.datasource.url=jdbc:mysql://localhost/demo
spring.datasource.username=root
spring.datasource.password=admin
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver

#Spring Security login queries
#problem in this line
#security.basic.enabled=false  
spring.thymeleaf.enabled=false
spring.queries.users-query=select email, password, '1' as enabled from auth_user where email=? and status='VERIFIED'
spring.queries.roles-query=select u.email, r.role_name from auth_user u inner join auth_user_role ur on(u.auth_user_id=ur.auth_user_id) inner join auth_role r on(ur.auth_role_id=r.auth_role_id) where u.email=?

型号：

User.java

package com.BasicWebMVC.model;

import java.util.Set;

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.JoinTable;
import javax.persistence.ManyToMany;
import javax.persistence.Table;

@Entity
@Table(name = "auth_user")
public class User {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name = "auth_user_id")
    private int id;

    @Column(name = "first_name")
    private String name;

    @Column(name = "last_name")
    private String lastName;

    @Column(name = "email")
    private String email;

    @Column(name = "password")
    private String password;

    @Column(name = "mobile")
    private String mobile;

    @Column(name = "status")
    private String status;

    @ManyToMany(cascade = CascadeType.ALL)
    @JoinTable(name = "auth_user_role", joinColumns = @JoinColumn(name = "auth_user_id"), inverseJoinColumns = @JoinColumn(name = "auth_role_id"))
    private Set<Role> roles;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getLastName() {
        return lastName;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String getMobile() {
        return mobile;
    }

    public void setMobile(String mobile) {
        this.mobile = mobile;
    }

    public String getStatus() {
        return status;
    }

    public void setStatus(String status) {
        this.status = status;
    }

    public Set<Role> getRoles() {
        return roles;
    }

    public void setRoles(Set<Role> roles) {
        this.roles = roles;
    }


}

role.java

package com.BasicWebMVC.model;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table(name = "auth_role")
public class Role {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name = "auth_role_id")
    private int id;

    @Column(name = "role_name")
    private String role;

    @Column(name = "role_desc")
    private String desc;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getRole() {
        return role;
    }

    public void setRole(String role) {
        this.role = role;
    }

    public String getDesc() {
        return desc;
    }

    public void setDesc(String desc) {
        this.desc = desc;
    }


}

如何解决该问题？ 提前致谢。

Answer 1

首先检查您的视图解析器是否正确配置。在您的代码中，我找不到正在配置的视图解析器，这可能会导致问题。在您的application.properties中，您已禁用thymeleaf视图解析器，因此spring不会为您自动配置它：

data.table

  

如果您使用Thymeleaf，则还有一个名为ThymeleafViewResolver的   ‘thymeleafViewResolver’。它通过围绕   查看带有前缀和后缀的名称。前缀是   spring.thymeleaf.prefix，后缀是spring.thymeleaf.suffix。   前缀和后缀的值默认为“ classpath：/ templates /”   和“ .html”。您可以通过以下方法覆盖ThymeleafViewResolver   提供同名的豆子。

还要确保在pom中添加了spring-boot thymeleaf依赖项：

spring.thymeleaf.enabled=false

如果您将百里香叶用作视图解析器并希望对其进行手动配置，请添加以下配置或通过application.properties将启用默认的自动配置：

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-thymeleaf</artifactId>
    <version>1.4.0.RELEASE</version>
</dependency>

如果您使用的是 jsp 作为视图解析器，则可以通过@Configuration public class WebConfig implements WebMvcConfigurer { @Bean public ClassLoaderTemplateResolver templateResolver() { var templateResolver = new ClassLoaderTemplateResolver(); templateResolver.setPrefix("templates/"); templateResolver.setCacheable(false); templateResolver.setSuffix(".html"); templateResolver.setTemplateMode("HTML5"); templateResolver.setCharacterEncoding("UTF-8"); return templateResolver; } @Bean public SpringTemplateEngine templateEngine() { SpringTemplateEngine templateEngine = new SpringTemplateEngine(); templateEngine.setTemplateResolver(templateResolver()); templateEngine.setTemplateEngineMessageSource(messageSource()); return templateEngine; } @Bean public ViewResolver viewResolver() { var viewResolver = new ThymeleafViewResolver(); viewResolver.setTemplateEngine(templateEngine()); viewResolver.setCharacterEncoding("UTF-8"); return viewResolver; } } 或appplication.yml使用默认配置进行配置。但是jsp仅能正常工作 WAR ，并小心添加必要的依赖项。

application.properties

如果我们未明确注册任何ViewResolver，则默认情况下将使用spring.mvc.view.prefix=/WEB-INF/view/ spring.mvc.view.suffix=.jsp 实例，其'prefix'和'suffix'属性设置为空字符串。这就是说，我们必须在应用程序中使用完整的视图路径，如果不这样做，则会由于构建视图路径的方式而获得循环视图路径异常。

关于您的循环依赖，这是一篇相关的文章：How to avoid the "Circular view path" exception with Spring MVC test

Answer 2

将@Controller更改为@RestController可以解决此错误。