欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识！
您现在的位置是： 首页  >  IT编程

javaweb各种框架组合案例(四)：maven+spring+springMVC+spring data jpa【失败案例】

程序员文章站 2022-06-24 11:14:08
一、失败案例 1. 控制台报错信息 2. 初步判断 spring data jpa 无法自动实现dao层接口 3. 原因 未知，非扫描包问题 二、项目 1. 项目整体包结构 2. 业务 实现一个用户具有多部手机的业务 3. 各配置文件 （1）pom.xml （2）spring-context.xml ......

一、失败案例

1. 控制台报错信息

严重: exception sending context initialized event to listener instance of class org.springframework.web.context.contextloaderlistener
org.springframework.beans.factory.unsatisfieddependencyexception: error creating bean with name 'userserviceimpl': unsatisfied dependency expressed through field 'userdao'; nested exception is org.springframework.beans.factory.beancreationexception: error creating bean with name 'userdao': invocation of init method failed; nested exception is java.util.nosuchelementexception
    at org.springframework.beans.factory.annotation.autowiredannotationbeanpostprocessor$autowiredfieldelement.inject(autowiredannotationbeanpostprocessor.java:588)
    at org.springframework.beans.factory.annotation.injectionmetadata.inject(injectionmetadata.java:88)
    at org.springframework.beans.factory.annotation.autowiredannotationbeanpostprocessor.postprocesspropertyvalues(autowiredannotationbeanpostprocessor.java:366)
    at org.springframework.beans.factory.support.abstractautowirecapablebeanfactory.populatebean(abstractautowirecapablebeanfactory.java:1264)
    at org.springframework.beans.factory.support.abstractautowirecapablebeanfactory.docreatebean(abstractautowirecapablebeanfactory.java:553)
    at org.springframework.beans.factory.support.abstractautowirecapablebeanfactory.createbean(abstractautowirecapablebeanfactory.java:483)
    at org.springframework.beans.factory.support.abstractbeanfactory$1.getobject(abstractbeanfactory.java:306)
    at org.springframework.beans.factory.support.defaultsingletonbeanregistry.getsingleton(defaultsingletonbeanregistry.java:230)
    at org.springframework.beans.factory.support.abstractbeanfactory.dogetbean(abstractbeanfactory.java:302)
    at org.springframework.beans.factory.support.abstractbeanfactory.getbean(abstractbeanfactory.java:197)
    at org.springframework.beans.factory.support.defaultlistablebeanfactory.preinstantiatesingletons(defaultlistablebeanfactory.java:761)
    at org.springframework.context.support.abstractapplicationcontext.finishbeanfactoryinitialization(abstractapplicationcontext.java:867)
    at org.springframework.context.support.abstractapplicationcontext.refresh(abstractapplicationcontext.java:543)
    at org.springframework.web.context.contextloader.configureandrefreshwebapplicationcontext(contextloader.java:443)
    at org.springframework.web.context.contextloader.initwebapplicationcontext(contextloader.java:325)
    at org.springframework.web.context.contextloaderlistener.contextinitialized(contextloaderlistener.java:107)
    at org.apache.catalina.core.standardcontext.listenerstart(standardcontext.java:4797)
    at org.apache.catalina.core.standardcontext.startinternal(standardcontext.java:5291)
    at org.apache.catalina.util.lifecyclebase.start(lifecyclebase.java:150)
    at org.apache.catalina.core.containerbase$startchild.call(containerbase.java:1559)
    at org.apache.catalina.core.containerbase$startchild.call(containerbase.java:1549)
    at java.util.concurrent.futuretask.run(futuretask.java:266)
    at java.util.concurrent.threadpoolexecutor.runworker(threadpoolexecutor.java:1149)
    at java.util.concurrent.threadpoolexecutor$worker.run(threadpoolexecutor.java:624)
    at java.lang.thread.run(thread.java:748)

 

2. 初步判断

　　spring data jpa 无法自动实现dao层接口

3. 原因

　　未知，非扫描包问题

 

二、项目

1. 项目整体包结构

javaweb各种框架组合案例(四)：maven+spring+springMVC+spring data jpa【失败案例】

2. 业务

　　实现一个用户具有多部手机的业务

3. 各配置文件

（1）pom.xml

<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.xiaog</groupid>
  <artifactid>testssdj</artifactid>
  <version>0.0.1-snapshot</version>
  <packaging>war</packaging>
  
  <dependencies>
      <!-- spring+springmvc*依赖包，包含spring-webmvc、spring-aop、spring-beans、
      spring-context、spring-core、spring-jcl、spring-expression、spring-web -->
      <dependency>
      <groupid>org.springframework</groupid>
      <artifactid>spring-webmvc</artifactid>
      <version>4.3.10.release</version>
    </dependency>
    
    <!-- spring-aop所依赖的静态代理 ，
        使用aop方式管理事务，在service方法执行前开启事务，
        方法执行后提交事务，方法执行失败回滚事务-->
    <dependency>
        <groupid>org.aspectj</groupid>
        <artifactid>aspectjrt</artifactid>
        <version>1.8.0</version>
    </dependency>
    <dependency>
        <groupid>org.aspectj</groupid>
        <artifactid>aspectjweaver</artifactid>
        <version>1.8.0</version>
    </dependency>
    
    <!-- 数据库方面 -->
    <dependency>
        <groupid>mysql</groupid>
        <artifactid>mysql-connector-java</artifactid>
        <version>5.1.47</version>
    </dependency>
    <dependency>
        <groupid>com.alibaba</groupid>
        <artifactid>druid</artifactid>
        <version>1.1.10</version>
    </dependency>
    
    <!-- orm框架 -->
    <dependency>
        <groupid>org.hibernate</groupid>
        <artifactid>hibernate-core</artifactid>
        <version>4.2.2.final</version>
    </dependency>
    
    <dependency>
        <groupid>org.hibernate</groupid>
        <artifactid>hibernate-entitymanager</artifactid>
        <version>4.2.2.final</version>
    </dependency>
    
    <!-- spring data jpa -->
    <dependency>
        <groupid>org.springframework.data</groupid>
        <artifactid>spring-data-jpa</artifactid>
        <version>1.11.3.release</version>
    </dependency>
    
    <dependency>
        <groupid>org.slf4j</groupid>
        <artifactid>slf4j-api</artifactid>
        <version>1.7.25</version>
    </dependency>
    
    <dependency>
        <groupid>org.slf4j</groupid>
        <artifactid>slf4j-log4j12</artifactid>
        <version>1.7.25</version>
    </dependency>
    
    <!-- logback -->
    <!-- <dependency>
        <groupid>ch.qos.logback</groupid>
        <artifactid>logback-classic</artifactid>
        <version>0.9.19</version>
    </dependency>
    <dependency>
        <groupid>org.logback-extensions</groupid>
        <artifactid>logback-ext-spring</artifactid>
        <version>0.1.2</version>
    </dependency>
    <dependency>
        <groupid>org.slf4j</groupid>
        <artifactid>jcl-over-slf4j</artifactid>
        <version>1.6.6</version>
    </dependency> --> 
    
    <!-- jsp需要 -->
    <dependency>
      <groupid>javax.servlet</groupid>
      <artifactid>servlet-api</artifactid>
      <version>3.0-alpha-1</version>
      <scope>provided</scope>
    </dependency>
    <dependency>
      <groupid>jstl</groupid>
      <artifactid>jstl</artifactid>
      <version>1.1.2</version>
    </dependency>
  </dependencies>
  
  <build>
  <defaultgoal>compile</defaultgoal>
      <plugins>
          <!-- maven插件 -->
         <plugin> 
            <groupid>org.apache.maven.plugins</groupid> 
            <artifactid>maven-compiler-plugin</artifactid>
            <version>3.1</version> 
            <configuration>
            <source>1.8</source>
            <target>1.8</target>            
                <encoding>utf-8</encoding> 
            </configuration> 
         </plugin> 
         
        <!-- tomcat插件 -->
        <plugin>
            <groupid>org.apache.tomcat.maven</groupid>
            <artifactid>tomcat7-maven-plugin</artifactid>
            <version>2.1</version>
            <configuration>
                <port>9999</port>
                <path>/testssdj</path>
                <uriencoding>utf-8</uriencoding>
                <finalname>testssdj</finalname>
                <server>tomcat7</server>
            </configuration>
        </plugin> 
      </plugins>
  </build>
</project>

 

（2）spring-context.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:tx="http://www.springframework.org/schema/tx"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:jpa="http://www.springframework.org/schema/data/jpa"
    xsi:schemalocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
                        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd
                        http://www.springframework.org/schema/context
                        http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa.xsd">

    <!--指定连接池配置 -->
    <!-- dao层 数据库连接部分 -->
    <!-- 加载配置文件 -->
    <context:property-placeholder
        location="classpath:jdbc.properties" />

    <!-- 配置service扫描 -->
    <context:component-scan
        base-package="com.xiaog.service" />

    <!-- 数据库连接池 -->
    <bean id="datasource"
        class="com.alibaba.druid.pool.druiddatasource" destroy-method="close">
        <property name="driverclassname" value="${jdbc.driver}" />
        <property name="url" value="${jdbc.url}" />
        <property name="username" value="${jdbc.username}" />
        <property name="password" value="${jdbc.password}" />
        <!-- 连接池的最大数据库连接数 -->
        <property name="maxactive" value="10" />
        <!-- 最大空闲数 -->
        <property name="maxidle" value="5" />
    </bean>
    
    <!-- spring整合jpa -->
    <bean id="entitymanagerfactory" class="org.springframework.orm.jpa.localcontainerentitymanagerfactorybean">
        <property name="datasource" ref="datasource"/>
        <property name="jpavendoradapter">
            <bean class="org.springframework.orm.jpa.vendor.hibernatejpavendoradapter"></bean>
        </property>
        <!-- 配置包扫描，扫描实体 -->
        <property name="packagestoscan" value="com.xiaog.entity"/>
        <property name="jpaproperties">
            <props>
                <!-- 生成的数据表的列的映射策略 -->
                <prop key="hibernate.ejb.naming_strategy">org.hibernate.cfg.improvednamingstrategy</prop>
                <!-- hibernate 基本属性 -->
                <prop key="hibernate.dialect">org.hibernate.dialect.mysql5innodbdialect</prop>
                <prop key="hibernate.show_sql">true</prop>
                <prop key="hibernate.format_sql">true</prop>
                <prop key="hibernate.hbm2ddl.auto">update</prop>
            </props>
        </property>
    </bean>

    <!-- 配置事务管理器 -->
    <bean id="transactionmanager" class="org.springframework.orm.jpa.jpatransactionmanager">
        <property name="entitymanagerfactory" ref="entitymanagerfactory" />
    </bean>

    <!-- 开启事务注解 -->
    <tx:annotation-driven transaction-manager="transactionmanager" />
    
    <!--指定spring data jpa要进行扫描的包,该包中的类框架会自动为其创建代理 -->
    <jpa:repositories base-package="com.xiaog.dao" entity-manager-factory-ref="entitymanagerfactory"></jpa:repositories>

</beans>

 

（3）spring-mvc.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:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemalocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
              http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd
              http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd">

    <!--配置controller扫描-->
    <context:component-scan base-package="com.xiaog.controller"/>

    <!-- 注解驱动 -->
    <mvc:annotation-driven/>

    <!--视图解析器-->
    <bean class="org.springframework.web.servlet.view.internalresourceviewresolver">
        <property name="prefix" value="/"/>
        <property name="suffix" value=".jsp"/>
    </bean>
</beans>

 

（4）jdbc.properties

jdbc.driver=com.mysql.jdbc.driver
jdbc.url=jdbc:mysql://localhost:3306/ssdj?usessl=false&amp;useunicode=true&amp;characterencoding=utf8
jdbc.username=root
jdbc.password=root

 

（5）web.xml

<?xml version="1.0" encoding="utf-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/xmlschema-instance"
    xmlns="http://java.sun.com/xml/ns/javaee"
    xsi:schemalocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
    version="3.0">
    <display-name>testssdj</display-name>
    <!-- spring配置文件路径 -->
    <context-param>
        <param-name>contextconfiglocation</param-name>
        <param-value>classpath:spring-context.xml</param-value>
    </context-param>

    <listener>
        <listener-class>org.springframework.web.context.contextloaderlistener</listener-class>
    </listener>

    <!-- 解决post乱码问题 -->
    <filter>
        <filter-name>encoding</filter-name>
        <filter-class>org.springframework.web.filter.characterencodingfilter</filter-class>
        <!-- 设置编码参是utf8 -->
        <init-param>
            <param-name>encoding</param-name>
            <param-value>utf-8</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>encoding</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    <!-- 配置springmvc 前端控制器 -->
    <servlet>
        <servlet-name>spring-mvc</servlet-name>
        <servlet-class>org.springframework.web.servlet.dispatcherservlet</servlet-class>
        <!--指定springmvc 配置文件 -->
        <init-param>
            <param-name>contextconfiglocation</param-name>
            <param-value>classpath:spring-mvc.xml</param-value>
        </init-param>
    </servlet>
    <servlet-mapping>
        <servlet-name>spring-mvc</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

    <!-- 添加日志监听器 -->
    <!-- <context-param>
        <param-name>logbackconfiglocation</param-name>
        <param-value>classpath:logback.xml</param-value>
    </context-param>
    <listener>
        <listener-class>ch.qos.logback.ext.spring.web.logbackconfiglistener</listener-class>
    </listener>  -->

    <welcome-file-list>
        <welcome-file>index.jsp</welcome-file>
    </welcome-file-list>
</web-app>

 

4. 实体层

package com.xiaog.entity;

import javax.persistence.entity;
import javax.persistence.generatedvalue;
import javax.persistence.generationtype;
import javax.persistence.id;
import javax.persistence.table;

@entity
@table(name="phone")
public class phone {
    
    @id
    @generatedvalue(strategy=generationtype.identity)
    private integer id;
    
    private string brand;//品牌

    public integer getid() {
        return id;
    }

    public void setid(integer id) {
        this.id = id;
    }

    public string getbrand() {
        return brand;
    }

    public void setbrand(string brand) {
        this.brand = brand;
    }

    @override
    public string tostring() {
        return "phone [id=" + id + ", brand=" + brand + "]";
    }

}
package com.xiaog.entity;

import java.util.list;

import javax.persistence.entity;
import javax.persistence.generatedvalue;
import javax.persistence.generationtype;
import javax.persistence.id;
import javax.persistence.joincolumn;
import javax.persistence.onetomany;
import javax.persistence.table;

@entity
@table(name="user")
public class user {
    
    @id
    @generatedvalue(strategy=generationtype.identity)
    private integer id;
    
    private string username;
    
    private string password;
    
    @onetomany(targetentity=phone.class)
    @joincolumn(name="user_id")
    private list<phone> phones;//一个用户拥有多部手机

    public integer getid() {
        return id;
    }

    public void setid(integer id) {
        this.id = id;
    }

    public string getusername() {
        return username;
    }

    public void setusername(string username) {
        this.username = username;
    }

    public string getpassword() {
        return password;
    }

    public void setpassword(string password) {
        this.password = password;
    }

    public list<phone> getphones() {
        return phones;
    }

    public void setphones(list<phone> phones) {
        this.phones = phones;
    }

    @override
    public string tostring() {
        return "user [id=" + id + ", username=" + username + ", password=" + password + ", phones=" + phones + "]";
    }
    
}

 

5. dao层

package com.xiaog.dao;

import org.springframework.data.jpa.repository.jparepository;
import org.springframework.stereotype.repository;

import com.xiaog.entity.phone;

@repository
public interface phonedao extends jparepository<phone, integer> {

}
package com.xiaog.dao;

import org.springframework.data.jpa.repository.jparepository;
import org.springframework.stereotype.repository;

import com.xiaog.entity.user;

@repository
public interface userdao extends jparepository<user, integer> {
    user findbyusernameandpassword(user user);
}

 

6. service层

package com.xiaog.service;

import com.xiaog.entity.user;

public interface userservice {
    user login(user user);
}
package com.xiaog.service.impl;

import org.slf4j.logger;
import org.slf4j.loggerfactory;
import org.springframework.beans.factory.annotation.autowired;
import org.springframework.stereotype.service;
import org.springframework.transaction.annotation.transactional;

import com.xiaog.dao.userdao;
import com.xiaog.entity.user;
import com.xiaog.service.userservice;

@service
@transactional
public class userserviceimpl implements userservice {

    @autowired
    private userdao userdao;
    
    private final static logger logger = loggerfactory.getlogger(userserviceimpl.class);
    
    @override
    public user login(user user) {
        //logger.info("进入userserviceimpl......");
        user = userdao.findbyusernameandpassword(user);
        logger.info("user="+user);
        return user;
    }

}

 

7.controller层

package com.xiaog.controller;

import org.slf4j.logger;
import org.slf4j.loggerfactory;
import org.springframework.beans.factory.annotation.autowired;
import org.springframework.stereotype.controller;
import org.springframework.ui.model;
import org.springframework.web.bind.annotation.requestmapping;

import com.xiaog.entity.user;
import com.xiaog.service.userservice;

@controller
@requestmapping("/user")
public class usercontroller {

    @autowired(required=false)
    private userservice userservice;
    
    private final static logger logger = loggerfactory.getlogger(usercontroller.class);
    
    @requestmapping(value = "/login",params= {"username","password","username!=","password!="})
    public string login(model model,user user) {
        logger.info("user(request)="+user);
        user = userservice.login(user);
        logger.info("user="+user);
        model.addattribute("user", user);
        return "result";
    }
    
}

 

8.jsp页面

<%@ page language="java" contenttype="text/html; charset=utf-8" pageencoding="utf-8"%>
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>insert title here</title>
</head>
<body>
    <form action="user/login" method="post">
        <div>
            <label>username</label>
            <input type="text" name="username"/>
        </div>
        <div>
            <label>password</label>
            <input type="password" name="password"/>
        </div>
        <div>
            <input type="submit" value="登录">
        </div>
    </form>
</body>
</html>
<%@ page language="java" contenttype="text/html; charset=utf-8" pageencoding="utf-8"%>
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title></title>
</head>
<body>
    username=${user}
</body>
</html>

 

三、求解决

　　若有大神能够解决问题，在下感激不尽

上一篇： MySQL(十一)--MySQL主从复制

下一篇： 大专生自学Java到找到工作的心得经历

推荐阅读