类型依赖

类型依赖

关注
发信
关注(28)粉丝(399)

spring mvc @Autowired error不满意的'必需'类型依赖

本文介绍了spring mvc @Autowired error不满意的'必需'类型依赖的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

在使用用户服务之前，我有用户服务处理用户实体，@Autowired在用户控制器类中。所以，我得到了错误：

I have user service that treat user entity, and @Autowired in user controller class before use user service. so, I got the error:

这里的代码：

userService

userService 

package com.yes.service;

import java.util.List;
import java.util.UUID;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.yes.domain.User;
import com.yes.repository.RoleRepository;
import com.yes.repository.UserRepository;

@Service
public class UserService {


    @Autowired
    private UserRepository userRepository;
    @Autowired
    private RoleRepository roleRepository;

    public User create(User user) {
        user.setId(UUID.randomUUID().toString());
        user.getRole().setId(UUID.randomUUID().toString());
        // We must save both separately since there is no cascading feature
        // in Spring Data MongoDB (for now)
        roleRepository.save(user.getRole());
        return userRepository.save(user);
    }
    public User read(User user) {
        return user;
    }
    public List<User> readAll() {
        return userRepository.findAll();
    }
    public User update(User user) {
        User existingUser = userRepository.findByUsername(user.getUserName());
        if (existingUser == null) {
            return null;
        }
        existingUser.setFirstName(user.getFirstName());
        existingUser.setLastName(user.getLastName());
        existingUser.getRole().setRole(user.getRole().getRole());
        // We must save both separately since there is no cascading feature
        // in Spring Data MongoDB (for now)
        roleRepository.save(existingUser.getRole());
        return userRepository.save(existingUser);
    }
    public Boolean delete(User user) {
        User existingUser = userRepository.findByUsername(user.getUserName());
        if (existingUser == null) {
            return false;
        }
        // We must delete both separately since there is no cascading feature
        // in Spring Data MongoDB (for now)
        roleRepository.delete(existingUser.getRole());
        userRepository.delete(existingUser);
        return true;
    }
}

userController（我使用userService，问题出在哪里） is）

userController (where i use the userService, and the problem is)

@Controller
@RequestMapping("/users")
public class UserController {

    @Autowired
    private UserService service;
    @RequestMapping
    public String getUsersPage() {
        return "users";
    }
    @RequestMapping(value="/records")
    public @ResponseBody UserListDto getUsers() {
        UserListDto userListDto = new UserListDto();
        userListDto.setUsers(service.readAll());
        return userListDto;
    }
    @RequestMapping(value="/get")
    public @ResponseBody User get(@RequestBody User user) {
        return service.read(user);
    }

    @RequestMapping(value="/create", method=RequestMethod.POST)
    public @ResponseBody User create(
            @RequestParam String username,
            @RequestParam String password,
            @RequestParam String firstName,
            @RequestParam String lastName,
            @RequestParam Integer role) {

        Role newRole = new Role();
        newRole.setRole(role);
        User newUser = new User();
        newUser.setUserName(username);
        newUser.setPassword(password);
        newUser.setFirstName(firstName);
        newUser.setLastName(lastName);
        newUser.setRole(newRole);
        return service.create(newUser);
    }
    @RequestMapping(value="/update", method=RequestMethod.POST)
    public @ResponseBody User update(
            @RequestParam String username,
            @RequestParam String firstName,
            @RequestParam String lastName,
            @RequestParam Integer role) {

        Role existingRole = new Role();
        existingRole.setRole(role);
        User existingUser = new User();
        existingUser.setUserName(username);
        existingUser.setFirstName(firstName);
        existingUser.setLastName(lastName);
        existingUser.setRole(existingRole);
        return service.update(existingUser);
    }
    @RequestMapping(value="/delete", method=RequestMethod.POST)
    public @ResponseBody Boolean delete(
            @RequestParam String username) {

        User existingUser = new User();
        existingUser.setUserName(username);
        return service.delete(existingUser);
    }
}

spring-data.xml

spring-data.xml

    <?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"
    xmlns:c="http://www.springframework.org/schema/c" xmlns:tx="http://www.springframework.org/schema/tx"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:mongo="http://www.springframework.org/schema/data/mongo"
    xmlns:util="http://www.springframework.org/schema/util"
    xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-3.1.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.1.xsd
http://www.springframework.org/schema/data/mongo
http://www.springframework.org/schema/data/mongo/spring-mongo-1.0.xsd
http://www.springframework.org/schema/util
http://www.springframework.org/schema/util/spring-util-3.1.xsd">

    <context:property-placeholder
        properties-ref="deployProperties" />


    <!-- MongoDB host -->
    <mongo:mongo host="${mongo.host.name}" port="${mongo.host.port}" />

    <!-- Template for performing MongoDB operations -->
    <bean id="mongoTemplate" class="org.springframework.data.mongodb.core.MongoTemplate"
        c:mongo-ref="mongo" c:databaseName="${mongo.db.name}" />

    <!-- Activate Spring Data MongoDB repository support -->
    <mongo:repositories base-package="com.yes.repository" mongo-template-ref="mongoTemplate"/>



    <!-- Service for initializing MongoDB with sample data using MongoTemplate -->
    <bean id="initMongoService" class="com.yes.service.InitMongoService" init-method="init"/>
</beans>

servlet-context.xml

servlet-context.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans:beans xmlns="http://www.springframework.org/schema/mvc"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:beans="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd
    http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
    http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">

<!-- DispatcherServlet Context: defines this servlet's request-processing infrastructure -->

<!-- Enables the Spring MVC @Controller programming model -->
<annotation-driven />
<context:component-scan base-package="com.yes.controller"/>



<!-- Handles HTTP GET requests for /resources/** by efficiently serving up static resources in the ${webappRoot}/resources directory -->
<resources mapping="/resources/**" location="/resources/" />

<!-- Resolves views selected for rendering by @Controllers to .jsp resources in the /WEB-INF/views directory -->
<beans:bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    <beans:property name="prefix" value="WEB-INF/views/" />
    <beans:property name="suffix" value=".jsp" />
</beans:bean>

applicationContext.xml

applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
xmlns:p="http://www.springframework.org/schema/p" xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
<context:property-placeholder
    properties-ref="deployProperties" />

<!-- Activates various annotations to be detected in bean classes -->
<context:annotation-config />

<!-- Scans the classpath for annotated components that will be auto-registered
    as Spring beans. For example @Controller and @Service. Make sure to set the
    correct base-package -->

    <context:component-scan base-package="com.yes.domain"/>
    <context:component-scan base-package="com.yes.dto"/>
    <context:component-scan base-package="com.yes.service"/>

<!-- Configures the annotation-driven Spring MVC Controller programming
    model. Note that, with Spring 3.0, this tag works in Servlet MVC only! -->
<mvc:annotation-driven />
<mvc:resources mapping="/resources/**" location="/resources/" />

<!-- Imports datasource configuration -->
<import resource="spring-data.xml" />
<bean id="deployProperties"
    class="org.springframework.beans.factory.config.PropertiesFactoryBean"
    p:location="/WEB-INF/spring/spring.properties" />

错误堆栈：

ERROR: org.springframework.web.servlet.DispatcherServlet - Context initialization failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userController': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private com.yes.service.UserService com.yes.controller.UserController.service; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No matching bean of type [com.yes.service.UserService] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:287)

web.xml 

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">

    <!-- The definition of the Root Spring Container shared by all Servlets and Filters -->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>/WEB-INF/spring/applicationContext.xml</param-value>
    </context-param>

    <!-- Creates the Spring Container shared by all Servlets and Filters -->
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

    <!-- Processes application requests -->
    <servlet>
        <servlet-name>appServlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>/WEB-INF/spring/appServlet/servlet-context.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>

    <servlet-mapping>
        <servlet-name>appServlet</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

</web-app>

编辑：问题是在修复Sotirios Delimanolis的错误后回答和评论。

the question is after fix the errors written in Sotirios Delimanolis answer and comment.

导致错误的问题是什么？

What is the problem cause the error?

答案：问题出现在Sotirios Delimanolis的回答中。关于答案的评论中描述的精确解决方案

谢谢

推荐答案

您的应用程序上下文和servlet上下文是在相同的包上进行组件扫描。

Your application context and servlet context are component scanning over the same packages.

您的申请上下文

<context:component-scan base-package="com.yes" />

与servlet上下文中的所有内容

Versus everything in servlet context

<context:component-scan base-package="com.yes.service"/>
<context:component-scan base-package="com.yes.controller"/>
<context:component-scan base-package="com.yes.domain"/>
<context:component-scan base-package="com.yes.repository"/>
<context:component-scan base-package="com.yes.dto"/>

因此会覆盖一些bean。你不想要这个。您的servlet上下文应扫描 @Controller bean。您的应用程序上下文应扫描其他所有内容，但不要让您的应用程序上下文扫描您的子（已导入）数据上下文已扫描的内容。修复你的包声明，以便所有这些都是不相交的。

So some beans will be overriden. You don't want this. Your servlet context should scan for @Controller beans. Your application context should scan for everything else, but don't make your application context scan for things already scanned by your child (imported) data context. Fix your package declarations so all of these are disjoint.

这篇关于spring mvc @Autowired error不满意的'必需'类型依赖的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！

08-21 04:02
Powered by LMLPHP ©2024 类型依赖 0.035106