spring整合javaweb(第二版)

引入依赖

<!--spring web-->
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-web</artifactId>
    <version>4.3.10.RELEASE</version>
</dependency>

整个目录结构：


entity层

public class Book {
    private Integer bookid;
    private String bookname;
    private String bookprice;
    private String booktype;

    public Integer getBookid() {return bookid;}
    public void setBookid(Integer bookid) {
        this.bookid = bookid;
    }

    public String getBookname() {
        return bookname;
    }
    public void setBookname(String bookname) {
        this.bookname = bookname;
    }

    public String getBookprice() {
        return bookprice;
    }
    public void setBookprice(String bookprice) {
        this.bookprice = bookprice;
    }

    public String getBooktype() {
        return booktype;
    }
    public void setBooktype(String booktype) {
        this.booktype = booktype;
    }
}

dao层

public interface IBookDAO {
    /**
     *
     * @param book
     * @return
     */
    public int addBook(Book book);
}

IBookDAO.xml

<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="cn.happy.javaweb.dao.IBookDAO">
    
    <insert id="addBook" parameterType="Book">
        insert into book(bookname,bookprice,booktype) value(#{bookname},#{bookprice},#{booktype})
    </insert>

</mapper>


service层

public interface IBookService {
    /**
     *
     * @param book
     * @return
     */
    public int addBook(Book book);
}

public class BookServiceImpl implements IBookService {
    //植入dao
    private IBookDAO dao;
    public int addBook(Book book) {
        return dao.addBook(book);
    }


    public IBookDAO getDao() {return dao;}
    public void setDao(IBookDAO dao) {
        this.dao = dao;
    }
}


jdbc.properties配置文件

jdbc.driverClassName=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql:///school
jdbc.username=root
jdbc.password=123156

大配置文件（mybatis-config01.xml）

<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>  <!--根节点 -->

    <!--配置类型别名-->
    <typeAliases>
         <!--将该类中的简单类型作为别名 -->
        <package name="cn.happy.javaweb.entity"></package>
     </typeAliases>

</configuration>

success.jsp页面

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>添加图书</title>
</head>
<body>
    <center>
    <form method="post" action="/BookServlet">
        图书名称:<input type="text" name="name"><br/>
        图书价格:<input type="text" name="price"><br/>
        图书类型:<input type="text" name="type"><br/>
        <input type="submit" value="提交">
    </form>
    </center>
</body>
</html>

index.jsp页面

<%@ page language="java"  pageEncoding="UTF-8" %>
<html>
<head>
    <title>添加图书</title>
</head>
<body>
<h2>添加成功</h2>
</body>
</html>

web.xml配置文件

<!--上下文-->
<context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:applicationContextJavaWed.xml</param-value>
</context-param>
<!--监听器  监听ServletContext i你提的方法执行过程-->
<listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>

servlet层

public class BookServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        request.setCharacterEncoding("UTF-8");
       String name= request.getParameter("name");
       String price= request.getParameter("price");
       String type= request.getParameter("type");
       Book book=new Book();
       book.setBookname(name);
       book.setBookprice(price);
       book.setBooktype(type);
        //调用添加的方法
       /* ClassPathXmlApplicationContext context=new ClassPathXmlApplicationContext("applicationContextJavaWed.xml");*/

        WebApplicationContext context = WebApplicationContextUtils.getRequiredWebApplicationContext(getServletContext());

        System.out.println(context);
        IBookService service = (IBookService)context.getBean("studentService");
        int count = service.addBook(book);
        if (count>0){  //添加成功
            request.getRequestDispatcher("/index.jsp").forward(request,response);
        }else {   //添加失败
            request.getRequestDispatcher("/success.jsp").forward(request,response);
        }

    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
      doPost(request,response);
    }
}

借助Tomcat来运行web应用
    ServletContext到底是什么？
    解析：在jsp中，他就是内置对象application的类型  ，在servlet中就是Servlet上下文    
 
      1.对于Web应用来说，ServletContext对象是唯一的，一个Web应用，只有一个ServletContext对象。
        该对象是在Web应用装载时初始化的，即在Web应用装载时自动执行接口ServletContext的初始化方法。
  
      2.该初始化方法在整个应用中只会执行一次。若将Spring容器的创建语句放到ServletContext的初始化方法中执行，
        并将创建好的Spring容器作为ServletContext的属性放入其中。以后再需要Spring容器，直接读取该属性值即可。
  
      3.ServletContext对象生命周期与Web应用的相同。即放在其中的属性为全局属性。
       所以，放入ServletContext中的Spring容器，在整个应用的生命周期中均可被访问。
       这样就可以保证Spring容器在Web应用中的唯一性了。

posted @ 2017-10-26 14:58 努力奋斗吧阅读(588) 评论(0) 收藏举报

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spring整合javaweb(第二版)

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