第89天学习打卡（SpringMVC ssmbuild整合）
ssmbuild 整合
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:mvc="http://www.springframework.org/schema/mvc"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd">
<!--1.注解驱动-->
<mvc:annotation-driven/>
<!-- 2静态资源过滤-->
<mvc:default-servlet-handler/>
<!-- 3.扫描包 controller-->
<context:component-scan base-package="com.kuang.controller"/>
<!-- 4.视图解析器-->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/jsp/"/>
<property name="suffix" value=".jsp"/>
</bean>
</beans>
applicationContext.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"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd">
<import resource="classpath:spring-dao.xml"/>
<import resource="spring-service.xml"/>
<import resource="classpath:spring-mvc.xml"/>
</beans>
web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
version="4.0">
<!-- DispatchServlet-->
<servlet>
<servlet-name>springmvc</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:applicationContext.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>springmvc</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<filter>
<filter-name>encodingFilter</filter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>utf-8</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>encodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<!-- Session-->
<session-config>
<session-timeout>15</session-timeout>
</session-config>
</web-app>
BookController:
package com.kuang.controller;
import com.kuang.pojo.Books;
import com.kuang.services.BookService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import java.util.List;
@Controller
@RequestMapping("/book")
public class BookController {
//controller 调service层
@Autowired
@Qualifier("BookServiceImpl")
private BookService bookService;
//查询全部的书籍，并且返回到一个书籍展示页面 调service层的方法
@RequestMapping("/allBook")
public String list(Model model){
List<Books> list = bookService.queryAllBook();
//返回前端展示
model.addAttribute("list",list);
//返回allBook页面
return "allBook";
}
}
出现的错误：
**在测试Tomcat的时候没能启动的时候出现 Artifact ssmbuild:war exploded: Error during artifact deployment. See server log for details **
前提是projectstructer里面已经配置了lib的情况下可以把9换成8
测试：
import com.kuang.pojo.Books;
import com.kuang.services.BookService;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class MyTest {
@Test
public void test(){
ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
BookService bookServiceImpl = (BookService) context.getBean("BookServiceImpl");
for (Books books : bookServiceImpl.queryAllBook()) {
System.out.println(books);
}
}
}
出现的空指针错误：
排错思路：
问题： bean不存在
步骤：
1.查看这个bean注入是否成功! ok
2.Junit单元测试 看我们的代码是否能够查询出来结果! ok
3.上两步成功 那么问题，一定不在我们的底层，是spring出了问题!
4.springmvc ,整合的时候没有调用到我们的service 层的bean;
1.applicationContext.xml 没有注入bean
2web.xml中，我们也绑定过配置文件，发现问题，我们配置的是spring-mvc.xml.这里面确实没有service bean ,所有为空指针
在web.xml中配置这个:**我在前面也配置了的 不知道怎么回事 再次运行就解决了 **
<servlet>
<servlet-name>springmvc</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:applicationContext.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
BookController:
package com.kuang.controller;
import com.kuang.pojo.Books;
import com.kuang.services.BookService;
import com.kuang.services.BookServiceImpl;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import java.util.List;
@Controller
@RequestMapping("/book")
public class BookController {
//controller 调service层
@Autowired
@Qualifier("BookServiceImpl")
private BookService bookService ;
//查询全部的书籍，并且返回到一个书籍展示页面 调service层的方法
@RequestMapping("/allBook")
public String list(Model model){
List<Books> list = bookService.queryAllBook();
//返回前端展示
model.addAttribute("list",list);
//返回allBook页面
return "allBook";
}
//跳转到增加书籍页面
@RequestMapping("/toAddBook")
public String toAddPaper(){
return "addBook";
}
//添加书籍的请求
@RequestMapping("/addBook")
public String addBook(Books books){
System.out.println("addBook=>" + books);
bookService.addBook(books);
//重定向可以阻止重复提交表单
return "redirect:/book/allBook"; //重定向到我们的 @RequestMapping("/allBook")请求
}
}
addBook.jsp
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %><%@ page contentType="text/html;charset=UTF-8" language="java" %><html><head> <title>Title</title> <link href="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet"></head><body><div class="container"> <div class="row clearfix"> <div class="col-md-12 column"> <div class="page-header"> <h1> <small>新增书籍</small> </h1> </div> </div> </div> <form action="${pageContext.request.contextPath}/book/addBook" method="post"> <div class="form-group"> <label >书籍名称:</label> <input type="text" name="bookName" class="form-control" required > </div> <div class="form-group"> <label >书籍数量:</label> <input type="text" name="bookCounts" class="form-control" required> </div> <div class="form-group"> <label>书籍描述:</label> <input type="text" name="detail" class="form-control" required> </div> <div class="form-group"> <label>书籍描述:</label> <input type="submit" class="form-control" value="添加"> </div> </form></div></body></html>
allBook.jsp
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %><%@ page contentType="text/html;charset=UTF-8" language="java" %><html><head> <title>书籍展示</title><%-- BookStrap 美化界面--%> <link href="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet"></head><body><div class="container"><%-- 栅格 把屏幕分成12分--%> <div class="row clearfix"> <div class="col-md-12 column"> <div class="page-header"> <h1> <small>书籍列表-----显示所有书籍</small> </h1> </div> </div> <div class="row"> <div class="col-md-4 column"> <a class="btn btn-primary" href="${pageContext.request.contextPath}/book/toAddBook">新增书籍</a> </div> </div> </div><%-- 清除浮动--%> <div class="row clearfix"> <div class="col-md-12 column"> <table class="table table-hover table-striped"> <thead> <tr> <th>书籍编号</th> <th>书籍名称</th> <th>书籍数量</th> <th>书籍详情</th> <th>操作</th> </tr> </thead><%-- 书籍从数据库中查询出来，从这个list中遍历出来：foreach--%> <tbody> <c:forEach var="book" items="${list}"> <tr> <td>${book.bookID}</td> <td>${book.bookName}</td> <td>${book.bookCounts}</td> <td>${book.detail}</td> <td> <a href="${pageContext.request.contextPath}/book/toUpdate?id=${book.bookID}">修改</a> | <a href="#">删除</a> </td> </tr> </c:forEach> </tbody> </table> </div> </div></div></body></html>
index.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %><html> <head> <title>首页</title> <style> a{ text-decoration: none; color: black; font-size: 18px; } h3{ width: 180px; height: 38px; margin: 100px auto; text-align: center; line-height: 38px; background: deepskyblue; border-radius: 5px; } </style> </head> <body><%-- 取绝对地址--%><h3> <a href="${pageContext.request.contextPath}/book/allBook">进入书籍页面</a></h3> </body></html>
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