guice整合struts2与jpa，guice的使用

Posted 2020-08-05 全力以赴001

传统我们开发一般使用ssh，但是有些微服务应用的项目我们不需要这么臃肿的框架做开发，于是采用了guice+struts2+guice作为框架组合进行了开发。

 

先看我们项目引用的jar包:

使用的时候一定要主要jar的版本问题.我项目在jdk1.7上面开发的

 

然后看一下web.xml的配置:

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <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">
 3   <filter>
 4     <filter-name>guiceFilter</filter-name>
 5     <filter-class>com.google.inject.servlet.GuiceFilter</filter-class>
 6   </filter>
 7   <filter-mapping>
 8     <filter-name>guiceFilter</filter-name>
 9     <url-pattern>/*</url-pattern>
10   </filter-mapping>
11   <listener>
12     <listener-class>com.ming.core.web.listener.GoogleGuiceServletContextListener</listener-class>
13   </listener>
14   
15   <welcome-file-list>
16     <welcome-file>index.jsp</welcome-file>
17   </welcome-file-list>
18 </web-app>

然后是struts.xml的配置:

 1 <?xml version="1.0" encoding="UTF-8" ?>
 2 <!DOCTYPE struts PUBLIC
 3     "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
 4     "http://struts.apache.org/dtds/struts-2.3.dtd">
 5 
 6 <struts>
 7     <!-- 引用guice代理 -->
 8     <constant name="struts.objectFactory" value="guice" />
 9     <constant name="struts.i18n.encoding" value="UTF-8" />    
10     <constant name="struts.enable.DynamicMethodInvocation" value="true"/>
11     <include file="com/ming/user/action/userStruts.xml"></include>
12 </struts>

然后是jpa的persistence.xml的配置:

 1 <persistence xmlns="http://java.sun.com/xml/ns/persistence"
 2     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 3     xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd"
 4     version="2.0">
 5     <persistence-unit name="myunit" transaction-type="RESOURCE_LOCAL">
 6 
 7         <provider>org.hibernate.ejb.HibernatePersistence</provider>
 8         <class>com.ming.user.entity.Student</class>
 9         <properties>
10             <property name="hibernate.connection.provider_class"
11                 value="org.hibernate.service.jdbc.connections.internal.C3P0ConnectionProvider" />
12             <property name="hibernate.dialect" value="org.hibernate.dialect.mysql5Dialect" />
13             <property name="hibernate.c3p0.max_size" value="2" />
14             <property name="hibernate.c3p0.min_size" value="1" />
15             <property name="hibernate.c3p0.timeout" value="120" />
16             <property name="hibernate.c3p0.max_statements" value="100" />
17             <property name="hibernate.c3p0.idle_test_period" value="120" />
18             <property name="hibernate.c3p0.acquire_increment" value="1" />
19             <property name="hibernate.show_sql" value="true" />
20             <property name="hibernate.connection.driver_class" value="com.mysql.jdbc.Driver" />
21             <property name="hibernate.connection.url"
22                 value="jdbc:mysql://localhost:3306/test?autoReconnect=true&amp;useUnicode=true&amp;characterEncoding=gbk" />
23             <property name="hibernate.connection.username" value="root" />
24             <property name="hibernate.connection.password" value="root" />
25             <property name="hibernate.temp.use_jdbc_metadata_defaults"
26                 value="false" />
27         </properties>
28 
29         <!-- <properties> <property name="hibernate.dialect" value="org.hibernate.dialect.MySQL5Dialect" 
30             /> <property name="hibernate.connection.driver_class" value="com.mysql.jdbc.Driver" 
31             /> <property name="hibernate.connection.driver" value="com.mysql.jdbc.Driver" 
32             /> <property name="hibernate.connection.url" value="jdbc:mysql://localhost:3306/test?autoReconnect=true&amp;useUnicode=true&amp;characterEncoding=UTF-8" 
33             /> <property name="hibernate.connection.user" value="root" /> <property name="hibernate.connection.password" 
34             value="root" /> <property name="hibernate.temp.use_jdbc_metadata_defaults" 
35             value="false"/> </properties> -->
36     </persistence-unit>
37 </persistence>

然后是module的一些配置:

package com.ming.core.web.listener;

import com.google.inject.Guice;
import com.google.inject.Injector;
import com.google.inject.servlet.GuiceServletContextListener;
import com.ming.user.UserModule;

public class GoogleGuiceServletContextListener extends GuiceServletContextListener {

    @Override
    protected Injector getInjector() {
        
        return Guice.createInjector(new UserModule());
        //如果绑定多个module，需要像下面这样就可以了
        //return Guice.createInjector(new UserModule(),new UserModule());
    }

}

package com.ming.user;

import org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter;

import com.google.inject.AbstractModule;
import com.google.inject.Singleton;
import com.google.inject.persist.PersistFilter;
import com.google.inject.persist.jpa.JpaPersistModule;
import com.google.inject.servlet.ServletModule;
import com.google.inject.struts2.Struts2GuicePluginModule;
public class UserModule extends AbstractModule {
    @Override
    protected void configure() {
        install(new ServletModule(){
            @Override
            protected void configureServlets() {
                install(new JpaPersistModule("myunit")); //这个一定要写最前面
                install(new Struts2GuicePluginModule());//这个是struts2与guice组件结合的注入
                bind(StrutsPrepareAndExecuteFilter.class).in(Singleton.class);//这个类似struts2的那个过滤
                filter("/*").through(StrutsPrepareAndExecuteFilter.class);
                filter("/*").through(PersistFilter.class);
            }
        });
    
    }
    
}

以上是几个重要的配置文件。

下面是项目结构:

 

 注意persistence.xml这个配置文件要放在src下的META-INF下。

 

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