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Web开发:Struts2 Spring Hibernate整合(二)——Spring的使用

2015-09-09 17:25 447 查看

    在struts2的基础上使用Spring,

1、首先需要导入Spring相关的包,在pom.xml中加入以下内容:

<!-- spring依赖包 -->
<!-- spring3 -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>3.1.2.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>3.1.2.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>3.1.2.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-beans</artifactId>
<version>3.1.2.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>3.1.2.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-expression</artifactId>
<version>3.1.2.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-orm</artifactId>
<version>3.1.2.RELEASE</version>
</dependency>

 2、使用spring

(1)使用spring:首先在web.xml中配置spring相关项,第一项设置spring配置文件路径,后面配置spring的监听,当采用spring创建实例方式时,将按照配置文件中类的依赖关系进行依赖注入。

<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:contextConfig.xml</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>

 (2)配置类的依赖关系:创建contextConfig.xml文件,将文件放置在上面指定的路径下,文件内容如下(loginAction依赖于loginService,其中loginService用来做逻辑判断是否登录成功):

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
<bean id="loginService" class="com.mz.service.LoginServiceImpl">
</bean>

<bean id="loginAction" class="com.mz.action.LoginAction">
<property name="loginService" >
<ref local="loginService"/>
</property>
</bean>
</beans>

 (3)创建ILoginService接口和创建LoginServiceImpl类:类实现接口,在LoginAction中包含ILoginService类型的属性,通过set方法设置属性所指向的具体的对象(依赖注入),这样可以通过修改配置文件修改具体实现:

LoginAction类:

package com.mz.action;

import com.mz.service.ILoginService;
import com.opensymphony.xwork2.ActionSupport;
import org.apache.struts2.ServletActionContext;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.UnsupportedEncodingException;

/**
* Created by hadoop on 15-9-7.
*/
public class LoginAction extends ActionSupport {
private static final long serialVersionUID = 1L;

private ILoginService loginService;

public void setLoginService(ILoginService loginService) {
this.loginService = loginService;
}

public ILoginService getLoginService(){
return this.loginService;
}

public String execute(){
return SUCCESS;
}

public String login() throws IOException {
try {

HttpServletRequest request = ServletActionContext.getRequest();
HttpServletResponse response = ServletActionContext.getResponse();
request.setCharacterEncoding("UTF-8");
response.setContentType("text/html;charset=utf-8");
String username = request.getParameter("username");
String password = request.getParameter("password");
System.out.println(username + ":" + password);
boolean login = loginService.userLogin(username, password);
if(login){
response.getWriter().write("login success!");
response.getWriter().flush();
return SUCCESS;
}
else {
response.getWriter().write("login failed!");
response.getWriter().flush();
return "login";
}
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
return "login";
}

}
}

 ILoginService接口:

package com.mz.service;

/**
* Created by hadoop on 15-9-8.
*/
public interface ILoginService {
boolean userLogin(String username, String password);
}

 LoginServiceImple类:

package com.mz.service;

import com.mz.dao.IUserDao;

/**
* Created by hadoop on 15-9-8.
*/
public class LoginServiceImpl implements ILoginService {

public boolean userLogin(String username, String password) {

if("admin".equals(username)&&"123456".equals(password)){
return true;
}else{
return false;
}
}
}

 (这个时候rebuild工程,发现网页访问时报错,nullPointException,因为在前面的配置中action类是通过struts2生成的实例,它不会使用依赖注入创建loginService)

(4)让struts2按照spring的规则来生成对象:修改strut.xml配置文件,将class换成Spring配置文件中的id

<package name="front" namespace="/" extends="struts-default">

<action name="login" class="loginAction" method="login">
<result name="success">/index.jsp</result>
<result name="login">/login.jsp</result>
</action>

</package>

(5)最后还需要使用struts2与Spring结合的包,所以在pom.xml中导入包,注意版本对应,否在可能出错:

<!-- spring3和struts2结合包 -->
<dependency>
<groupId>org.apache.struts</groupId>
<artifactId>struts2-spring-plugin</artifactId>
<version>2.3.4.1</version>
</dependency>

然后告诉struts2需要使用Spring,在Struts.xml中加入

<constant name="struts.objectFactory" value="spring" />

这个时候struts2碰到loginAction时会去采用Spring的规则生成对象,rebuild工程,测试一般可以通过。

相关内容

(1)Web开发:Struts2 Spring Hibernate整合(一)——Struts2的使用

(2)Web开发:Struts2 Spring Hibernate整合(三)上——Hibernate的使用

(3)Web开发:Struts2 Spring Hibernate整合(三)下——Hibernate的使用

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