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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 2022-03-20 21:17:40
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

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