Springmvc入门
博客目标
- 1、Springmvc简介及配置
- 什么是Springmvc？
- Springmvc运作原理
- 原理图
- 2.Springmvc之helloword实现
- 导入pom依赖
- SSM整合的pom
- 写配置文件
- 修改配置文件web.xml
- 测试是否搭建成功
- 效果图
- 3、SpringmvcCRUD
- 提供工具类
- PageTag.java
- h.tld WEB-INF下
- bookList.jsp
- bookEdit.jsp
- BookService.java
- BookServiceImpl.java
- BookController.java
- 4.springmvc结果集处理
- Springmvc-servlet.xml
- 结果集处理的五种情况
- Resultset.jsp web-inf下
- b.jsp webapp下
- 5、Springmvc静态资源处理
- Springmvc-servlet.xml
1、Springmvc简介及配置
什么是Springmvc？
Spring Web MVC是一种基于Java的实现了MVC设计模式的、请求驱动类型的、轻量级Web框架。
Springmvc运作原理
1.浏览器请求：http://localhost:8080/say1
request对象去处理这个url,可以获取到除去ip+port+项目这一个固定的串，拿到/say1
2.在dispatcherservlet去寻找HandlerMapping
HandlerMapping:在整个spring上下文中寻找到了所有的被@requertMapping注解所标记的方法
如果@requertMapping这个注解里面的值有/say1,那么进行下一步
3.从前面以及能够获取到需要被调用的方法，那么dispatcherservlet就会寻找到handlerAdapt适配器来动态调用这个方法，然后会出一个结果
4.dispatcherservlet将结果封装成一个modelAndView对象，将其放回给ViewReslover进行解析
5.ViewReslover解析完毕后，会将对应的视图展示给用户
原理图
2.Springmvc之helloword实现
导入pom依赖
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>${spring.version}</version>
</dependency>
取代了之前的spring-context 依赖，spring-context的jar包是包含在了spring-webmvc中,所以只需要导入spring-webmvc既是导入了spring-context的jar包
<!--自定义标签库-->
<jstl.version>1.2</jstl.version>
<standard.version>1.1.2</standard.version>
<tomcat-jsp-api.version>8.0.47</tomcat-jsp-api.version>
<!--自定义标签库-->
<!-- 5.3、jstl、standard -->
<dependency>
<groupId>jstl</groupId>
<artifactId>jstl</artifactId>
<version>${jstl.version}</version>
</dependency>
<dependency>
<groupId>taglibs</groupId>
<artifactId>standard</artifactId>
<version>${standard.version}</version>
</dependency>
<!-- 5.4、tomcat-jsp-api -->
<dependency>
<groupId>org.apache.tomcat</groupId>
<artifactId>tomcat-jsp-api</artifactId>
<version>${tomcat-jsp-api.version} </version>
</dependency>
SSM整合的pom
<?xml version="1.0" encoding="UTF-8"?>
<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.zking</groupId>
<artifactId>ssm</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>war</packaging>
<name>ssm Maven Webapp</name>
<!-- FIXME change it to the project's website -->
<url>http://www.example.com</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
<maven.compiler.plugin.version>3.7.0</maven.compiler.plugin.version>
<!--添加jar包依赖-->
<!--1.spring 5.0.2.RELEASE相关-->
<spring.version>5.0.2.RELEASE</spring.version>
<!--2.mybatis相关-->
<mybatis.version>3.4.5</mybatis.version>
<!--mysql-->
<mysql.version>5.1.44</mysql.version>
<!--pagehelper分页jar依赖-->
<pagehelper.version>5.1.2</pagehelper.version>
<!--mybatis与spring集成jar依赖-->
<mybatis.spring.version>1.3.1</mybatis.spring.version>
<!--3.dbcp2连接池相关 druid-->
<commons.dbcp2.version>2.1.1</commons.dbcp2.version>
<commons.pool2.version>2.4.3</commons.pool2.version>
<!-- log4j2日志配置相关依赖 -->
<log4j2.version>2.9.1</log4j2.version>
<log4j2.disruptor.version>3.2.0</log4j2.disruptor.version>
<slf4j.version>1.7.13</slf4j.version>
<!--5.其他-->
<junit.version>4.12</junit.version>
<servlet.version>4.0.0</servlet.version>
<lombok.version>1.18.2</lombok.version>
<!-- redis与spring的整合依赖 -->
<redis.version>2.9.0</redis.version>
<redis.spring.version>1.7.1.RELEASE</redis.spring.version>
<!-- jackson -->
<jackson.version>2.9.3</jackson.version>
<!--自定义标签库-->
<jstl.version>1.2</jstl.version>
<standard.version>1.1.2</standard.version>
<tomcat-jsp-api.version>8.0.47</tomcat-jsp-api.version>
</properties>
<dependencies>
<!--1.spring相关-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-orm</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aspects</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>${spring.version}</version>
</dependency>
<!--2.mybatis相关-->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>${mybatis.version}</version>
</dependency>
<!--mysql-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>${mysql.version}</version>
</dependency>
<!--pagehelper分页插件jar包依赖-->
<dependency>
<groupId>com.github.pagehelper</groupId>
<artifactId>pagehelper</artifactId>
<version>${pagehelper.version}</version>
</dependency>
<!--mybatis与spring集成jar包依赖-->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>${mybatis.spring.version}</version>
</dependency>
<!--3.dbcp2连接池相关-->
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-dbcp2</artifactId>
<version>${commons.dbcp2.version}</version>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-pool2</artifactId>
<version>${commons.pool2.version}</version>
</dependency>
<!-- log4j2日志相关依赖 -->
<!-- log配置：Log4j2 + Slf4j -->
<!-- slf4j核心包-->
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>${slf4j.version}</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>jcl-over-slf4j</artifactId>
<version>${slf4j.version}</version>
<scope>runtime</scope>
</dependency>
<!--核心log4j2jar包-->
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-api</artifactId>
<version>${log4j2.version}</version>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-core</artifactId>
<version>${log4j2.version}</version>
</dependency>
<!--用于与slf4j保持桥接-->
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-slf4j-impl</artifactId>
<version>${log4j2.version}</version>
</dependency>
<!--web工程需要包含log4j-web，非web工程不需要-->
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-web</artifactId>
<version>${log4j2.version}</version>
<scope>runtime</scope>
</dependency>
<!--需要使用log4j2的AsyncLogger需要包含disruptor-->
<dependency>
<groupId>com.lmax</groupId>
<artifactId>disruptor</artifactId>
<version>${log4j2.disruptor.version}</version>
</dependency>
<!--5.其他-->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>${junit.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>${servlet.version}</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>${lombok.version}</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context-support</artifactId>
<version>${spring.version}</version>
</dependency>
<!--mybatis与ehcache整合-->
<dependency>
<groupId>org.mybatis.caches</groupId>
<artifactId>mybatis-ehcache</artifactId>
<version>1.1.0</version>
</dependency>
<!--ehcache依赖-->
<dependency>
<groupId>net.sf.ehcache</groupId>
<artifactId>ehcache</artifactId>
<version>2.10.0</version>
</dependency>
<!--redis-->
<dependency>
<groupId>redis.clients</groupId>
<artifactId>jedis</artifactId>
<version>${redis.version}</version>
</dependency>
<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-redis</artifactId>
<version>${redis.spring.version}</version>
</dependency>
<!-- jackson -->
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>${jackson.version}</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>${jackson.version}</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-annotations</artifactId>
<version>${jackson.version}</version>
</dependency>
<!--自定义标签库-->
<!-- 5.3、jstl、standard -->
<dependency>
<groupId>jstl</groupId>
<artifactId>jstl</artifactId>
<version>${jstl.version}</version>
</dependency>
<dependency>
<groupId>taglibs</groupId>
<artifactId>standard</artifactId>
<version>${standard.version}</version>
</dependency>
<!-- 5.4、tomcat-jsp-api -->
<dependency>
<groupId>org.apache.tomcat</groupId>
<artifactId>tomcat-jsp-api</artifactId>
<version>${tomcat-jsp-api.version}</version>
</dependency>
</dependencies>
<build>
<finalName>ssm</finalName>
<resources>
<!--解决mybatis-generator-maven-plugin运行时没有将XxxMapper.xml文件放入target文件夹的问题-->
<resource>
<directory>src/main/java</directory>
<includes>
<include>**/*.xml
src/main/resources
jdbc.properties
*.xml
maven-clean-plugin
3.1.0
maven-resources-plugin
3.0.2
maven-compiler-plugin
3.8.0
maven-surefire-plugin
2.22.1
maven-war-plugin
3.2.2
maven-install-plugin
2.5.2
maven-deploy-plugin
2.8.2
org.apache.maven.plugins
maven-compiler-plugin
${maven.compiler.plugin.version}
${maven.compiler.source}
${maven.compiler.target}
${project.build.sourceEncoding}
org.mybatis.generator
mybatis-generator-maven-plugin
1.3.2
mysql
mysql-connector-java
${mysql.version}
true
写配置文件
在WEB-INF下添加springmvc-servlet.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" xmlns:aop="http://www.springframework.org/schema/aop"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd">
<!-- 通过context:component-scan元素扫描指定包下的控制器-->
<!--1) 扫描com.onlyK.zf及子子孙孙包下的控制器(扫描范围过大，耗时)-->
<aop:aspectj-autoproxy/>
<context:component-scan base-package="com.onlyK.ssm"/>
<!--2) 此标签默认注册DefaultAnnotationHandlerMapping和AnnotationMethodHandlerAdapter -->
<!--两个bean，这两个bean是spring MVC为@Controllers分发请求所必须的。并提供了数据绑定支持，-->
<!--@NumberFormatannotation支持，@DateTimeFormat支持，@Valid支持，读写XML的支持（JAXB），读写JSON的支持（Jackson）-->
<mvc:annotation-driven></mvc:annotation-driven>
<!--3) ViewResolver视图解析器，不用写映射文件了 -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<!-- viewClass需要在pom中引入两个包：standard.jar and jstl.jar -->
<property name="viewClass"
value="org.springframework.web.servlet.view.JstlView"></property>
<property name="prefix" value="/"/>
<property name="suffix" value=".jsp"/>
</bean>
<!--4) 单独处理图片、样式、js等资源 -->
<!--<mvc:resources location="/css/" mapping="/css/**"/>-->
<!-- <mvc:resources location="/images/" mapping="/images/**"/>-->
<!--<mvc:resources location="/js/" mapping="/js/**"/>-->
</beans>
修改配置文件web.xml
<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_3_1.xsd"
version="3.1">
<display-name>Archetype Created Web Application</display-name>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:applicationContext.xml</param-value>
</context-param>
<!-- 读取Spring上下文的监听器 -->
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<!-- Spring MVC servlet -->
<servlet>
<servlet-name>SpringMVC</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<!--此参数可以不配置，默认值为：/WEB-INF/springmvc-servlet.xml-->
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/springmvc-servlet.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
<!--web.xml 3.0的新特性，是否支持异步-->
<async-supported>true</async-supported>
</servlet>
<servlet-mapping>
<servlet-name>SpringMVC</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<!-- 3、添加过滤器 解决中文乱码问题 -->
<filter>
<filter-name>encodingFilter</filter-name>
<filter-class>
org.springframework.web.filter.CharacterEncodingFilter
</filter-class>
<async-supported>true</async-supported>
<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>/*
到这里SSM整合完毕
测试是否搭建成功
写controller层 HelloController
package com.onlyK.ssm.controller;
import org.springframework.stereotype.Controller;
import org.springframework.stereotype.Service;
import org.springframework.web.bind.annotation.RequestMapping;
/**
* @author only老K
* @create 2019-11-24 15:22
*/
@Controller //给spring进行管理
public class HelloController {
@RequestMapping("say1")
public String say1(){
return "hello";
}
}
在webapp下写一个hello.jsp页面
<%--
Created by IntelliJ IDEA.
User: 86135
Date: 2019/11/24
Time: 15:24
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
onlyK
</body>
</html>
运行tomcat测试即可
效果图
3、SpringmvcCRUD
提供工具类
PageTag.java
package com.onlyK.ssm.tag;
import com.onlyK.ssm.utils.PageBean;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.tagext.BodyTagSupport;
import java.io.IOException;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
public class PageTag extends BodyTagSupport {
private static final long serialVersionUID = 383258790166308355L;
private PageBean pageBean;
public int doStartTag() throws JspException {
JspWriter out = pageContext.getOut();
try {
out.print(toHTML());
} catch (IOException e) {
e.printStackTrace();
}
return SKIP_BODY;
}
private String toHTML() {
StringBuilder sb = new StringBuilder();
// 拼接下一次分页请求搜提交的分页表单
sb.append(");
sb.append(" ");
Map<String, String[]> paMap = pageBean.getPaMap();
if(paMap != null && paMap.size()>0) {
Set<Entry<String, String[]>> entrySet = paMap.entrySet();
for (Entry<String, String[]> entry : entrySet) {
for(String value :entry.getValue() ) {
if(!"page".equals(entry.getKey())) {
sb.append("");
}
}
}
}
sb.append("");
// 拼接分页条
sb.append("");
// 拼接分页的javascript 代码
sb.append(" ");
return sb.toString();
}
public PageBean getPageBean() {
return pageBean;
}
public void setPageBean(PageBean pageBean) {
this.pageBean = pageBean;
}
}
h.tld WEB-INF下
<?xml version="1.0" encoding="UTF-8" ?>
<taglib xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-jsptaglibrary_2_0.xsd"
version="2.0">
<description>hyf 1.1 core library</description>
<display-name>hyf core</display-name>
<tlib-version>1.1</tlib-version>
<short-name>c</short-name>
<uri>/hyf</uri>
<tag>
<!--填写的是标签库中的标签名-->
<name>page</name>
<!--标签对应后台助手类-->
<tag-class>com.onlyK.ssm.tag.PageTag</tag-class>
<!--标签类别-->
<body-content>JSP</body-content>
<attribute>
<!--自定义标签中属性-->
<name>pageBean</name>
<!--属性值是否必填-->
<required>true</required>
<!--是否支持表达式EL表达式/ognl表达式-->
<rtexprvalue>true</rtexprvalue>
</attribute>
</tag>
</taglib>
bookList.jsp
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ taglib uri="/hyf" prefix="h"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>书籍</title>
</head>
<body>
<h2>书籍</h2>
<br>
<form action="${pageContext.request.contextPath}/book/list" method="post">
<!--用户设置查询 一页20条记录 -->
<!-- <input type="hidden" name="rows" value="20"/> -->
<!--用户设置不分页 -->
<!-- <input type="hidden" name="pagination" value="false"/> -->
书名：<input type="text" name="bname"> <input type="submit"
value="确定">
</form>
<a href="${pageContext.request.contextPath}/book/preSave">增加</a>
<table border="1" width="100%">
<tr>
<td>编号</td>
<td>名称</td>
<td>价格</td>
<td>操作</td>
</tr>
<c:forEach items="${bookList}" var="b">
<tr>
<td>${b.bid }</td>
<td>${b.bname }</td>
<td>${b.price }</td>
<td>
<a href="${pageContext.request.contextPath}/book/preSave?bid=${b.bid}">修改</a>
<a href="${pageContext.request.contextPath}/book/del/${b.bid}">删除</a>
</td>
</tr>
</c:forEach>
</table>
<h:page pageBean="${pagebean}"></h:page>
</body>
</html>
bookEdit.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>编辑页面</title>
</head>
<body>
<form action="${pageContext.request.contextPath}${b.bname == null ?'/book/add' : '/book/edit'}" method="post">
bid: <input type="text" value="${b.bid}" name="bid"/><br>
bname:<input type="text" value="${b.bname}" name="bname"/><br>
price:<input type="text" value="${b.price}" name="price"/><br>
<button type="submit">确认</button>
</form>
</body>
</html>
BookService.java
package com.onlyK.ssm.service;
import com.onlyK.ssm.model.Book;
import com.onlyK.ssm.utils.PageBean;
import java.util.List;
import java.util.Map;
/**
* @author only老K
* @create 2019-11-24 8:24
*/
public interface BookService {
int deleteByPrimaryKey(Integer bid);
int insert(Book record);
int insertSelective(Book record);
Book selectByPrimaryKey(Integer bid);
int updateByPrimaryKeySelective(Book record);
int updateByPrimaryKey(Book record);
List<Map> listPager(Map map, PageBean pageBean);
List<Map> listPager(Book book, PageBean pageBean);
}
BookServiceImpl.java
package com.onlyK.ssm.service.impl;
import com.onlyK.ssm.mapper.BookMapper;
import com.onlyK.ssm.model.Book;
import com.onlyK.ssm.service.BookService;
import com.onlyK.ssm.utils.PageBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
* @author only老K
* @create 2019-11-24 8:27
*/
@Service
public class BookServiceImpl implements BookService {
@Autowired
private BookMapper bookMapper;
@Override
public int deleteByPrimaryKey(Integer bid) {
return bookMapper.deleteByPrimaryKey(bid);
}
@Override
public int insert(Book record) {
return bookMapper.insert(record);
}
@Override
public int insertSelective(Book record) {
return bookMapper.insertSelective(record);
}
@Override
public Book selectByPrimaryKey(Integer bid) {
return bookMapper.selectByPrimaryKey(bid);
}
@Override
public int updateByPrimaryKeySelective(Book record) {
return bookMapper.updateByPrimaryKeySelective(record);
}
@Override
public int updateByPrimaryKey(Book record) {
return bookMapper.updateByPrimaryKey(record);
}
@Override
public List<Map> listPager(Map map, PageBean pageBean) {
return bookMapper.listPager(map);
}
@Override
public List<Map> listPager(Book book, PageBean pageBean) {
Map map=new HashMap();
map.put("bname",book.getBname());
return bookMapper.listPager(map);
}
}
BookController.java
package com.onlyK.ssm.controller;
import com.onlyK.ssm.model.Book;
import com.onlyK.ssm.service.BookService;
import com.onlyK.ssm.utils.PageBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import javax.servlet.http.HttpServletRequest;
import java.util.List;
import java.util.Map;
/**
* @author only老K
* @create 2019-11-24 16:01
*/
@Controller
@RequestMapping("/book")
public class BookController {
@Autowired
private BookService bookService;
@RequestMapping("/list")
public String list(Book book, HttpServletRequest req){
PageBean pageBean=new PageBean();
pageBean.setRequest(req);
List<Map> list = bookService.listPager(book,pageBean);
req.setAttribute("bookList",list);
req.setAttribute("pagebean",pageBean);
return "bookList";
}
@RequestMapping("/preSave")
public String preSave(Book book, HttpServletRequest req){
if(book ==null || book.getBid() ==null || book.getBid()==0){
return "bookEdit";
}
Map map = bookService.listPager(book, null).get(0);
req.setAttribute("b",map);
return "bookList";
}
@RequestMapping("/add")
public String add(Book book){
bookService.insertSelective(book);
return "redirect:/book/list";
}
@RequestMapping("/del/{bid}")
public String del(@PathVariable("bid") Integer bid){
bookService.deleteByPrimaryKey(bid);
return "redirect:/book/list";
}
@RequestMapping("/edit")
public String edit(Book book){
bookService.updateByPrimaryKeySelective(book);
return "redirect:/book/list";
}
}
4.springmvc结果集处理
springmvc中五种返回值处理情况
转发3种
转发到安全目录web-inf下
转发到根目录
转发到requestMapping
重定向2种
重定向到根目录
重定向到requestMapping
Springmvc-servlet.xml
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<!-- viewClass需要在pom中引入两个包：standard.jar and jstl.jar -->
<property name="viewClass"
value="org.springframework.web.servlet.view.JstlView"></property>
<property name="prefix" value="/WEB-INF/"/>//这里更改到了web-inf路径下
<property name="suffix" value=".jsp"/>
</bean>
结果集处理的五种情况
package com.onlyK.ssm.controller;
import org.springframework.stereotype.Controller;
import org.springframework.stereotype.Service;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;
/**
* @author only老K
* @create 2019-11-24 15:22
*/
@Controller //给spring进行管理
public class HelloController {
@RequestMapping("say1")
public String say1() {
return "hello";
}
@RequestMapping("say2")
public ModelAndView say2(){
ModelAndView mv=new ModelAndView();
mv.setViewName("/hello");
mv.addObject("msg","换个花样");
return mv;
}
//转发到安全目录下
@RequestMapping("/req1")
public String req1(){
System.out.println("转发到安全目录下..");
return "Resultset";
}
//转发到根目录下
@RequestMapping("/req2")
public String req2(){
System.out.println("转发到根目录下..");
return "forward:/b.jsp";
}
//转发到requestMapping
@RequestMapping("/req3")
public String req3(){
System.out.println("转发到requestMapping..");
return "forward:/req2";
}
//根目录下
@RequestMapping("/red1")
public String red1(){
System.out.println("重定向到根目录下..red1");
return "redirect:/b.jsp";
}
//
@RequestMapping("/red2")
public String red2(){
System.out.println("重定向到根目录下..");
return "redirect:/req2";
}
}
Resultset.jsp web-inf下
<%--
Created by IntelliJ IDEA.
User: 86135
Date: 2019/11/24
Time: 16:57
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>结果集知识点</title>
</head>
<body>
结果集知识点介绍
</body>
</html>
b.jsp webapp下
<%--
Created by IntelliJ IDEA.
User: 86135
Date: 2019/11/24
Time: 17:04
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
转发到根目录...
</body>
</html>
5、Springmvc静态资源处理
Springmvc-servlet.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" xmlns:aop="http://www.springframework.org/schema/aop"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd">
<!-- 通过context:component-scan元素扫描指定包下的控制器-->
<!--1) 扫描com.onlyK.zf及子子孙孙包下的控制器(扫描范围过大，耗时)-->
<aop:aspectj-autoproxy/>
<context:component-scan base-package="com.onlyK.ssm"/>
<!--2) 此标签默认注册DefaultAnnotationHandlerMapping和AnnotationMethodHandlerAdapter -->
<!--两个bean，这两个bean是spring MVC为@Controllers分发请求所必须的。并提供了数据绑定支持，-->
<!--@NumberFormatannotation支持，@DateTimeFormat支持，@Valid支持，读写XML的支持（JAXB），读写JSON的支持（Jackson）-->
<mvc:annotation-driven></mvc:annotation-driven>
<!--3) ViewResolver视图解析器，不用写映射文件了 -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<!-- viewClass需要在pom中引入两个包：standard.jar and jstl.jar -->
<property name="viewClass"
value="org.springframework.web.servlet.view.JstlView"></property>
<property name="prefix" value="/WEB-INF/"/>
<property name="suffix" value=".jsp"/>
</bean>
<!--4) 单独处理图片、样式、js等资源 -->
<!--<mvc:resources location="/css/" mapping="/css/**"/>-->
<mvc:resources location="/static/" mapping="/static/**"/>
<!--<mvc:resources location="/js/" mapping="/js/**"/>-->
</beans>
测试即可