1、构建项目结构如下
2、构建项目中的pom.xml文件中的依赖资源，里面包含ajax和分页插件的依赖哦
1 <?xml version="1.0" encoding="UTF-8"?> 2 3 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 4 xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> 5 <modelVersion>4.0.0</modelVersion> 6 7 <groupId>com</groupId> 8 <artifactId>ssm_day45_01</artifactId> 9 <version>1.0-SNAPSHOT</version> 10 <packaging>war</packaging> 11 12 <name>ssm_day45_01 Maven Webapp</name> 13 <!-- FIXME change it to the project's website --> 14 <url>http://www.example.com</url> 15 16 <properties> 17 <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> 18 <maven.compiler.source>1.7</maven.compiler.source> 19 <maven.compiler.target>1.7</maven.compiler.target> 20 </properties> 21 22 <dependencies> 23 <dependency> 24 <groupId>junit</groupId> 25 <artifactId>junit</artifactId> 26 <version>4.11</version> 27 </dependency> 28 29 30 <!--1 https://mvnrepository.com/artifact/org.springframework/spring-beans --> 31 <dependency> 32 <groupId>org.springframework</groupId> 33 <artifactId>spring-beans</artifactId> 34 <version>4.3.6.RELEASE</version> 35 </dependency> 36 37 38 <!--2 https://mvnrepository.com/artifact/org.springframework/spring-context --> 39 <dependency> 40 <groupId>org.springframework</groupId> 41 <artifactId>spring-context</artifactId> 42 <version>4.3.6.RELEASE</version> 43 </dependency> 44 45 46 <!-- 3https://mvnrepository.com/artifact/org.springframework/spring-core --> 47 <dependency> 48 <groupId>org.springframework</groupId> 49 <artifactId>spring-core</artifactId> 50 <version>4.3.6.RELEASE</version> 51 </dependency> 52 53 54 <!--4 https://mvnrepository.com/artifact/org.springframework/spring-expression --> 55 <dependency> 56 <groupId>org.springframework</groupId> 57 <artifactId>spring-expression</artifactId> 58 <version>4.3.6.RELEASE</version> 59 </dependency> 60 61 62 <!--5 https://mvnrepository.com/artifact/org.springframework/spring-aop --> 63 <dependency> 64 <groupId>org.springframework</groupId> 65 <artifactId>spring-aop</artifactId> 66 <version>4.3.6.RELEASE</version> 67 </dependency> 68 69 70 <!--6 https://mvnrepository.com/artifact/aopalliance/aopalliance --> 71 <dependency> 72 <groupId>aopalliance</groupId> 73 <artifactId>aopalliance</artifactId> 74 <version>1.0</version> 75 </dependency> 76 77 78 <!--7 https://mvnrepository.com/artifact/org.aspectj/aspectjweaver --> 79 <dependency> 80 <groupId>org.aspectj</groupId> 81 <artifactId>aspectjweaver</artifactId> 82 <version>1.8.10</version> 83 </dependency> 84 85 86 <!--8 https://mvnrepository.com/artifact/log4j/log4j --> 87 <dependency> 88 <groupId>log4j</groupId> 89 <artifactId>log4j</artifactId> 90 <version>1.2.17</version> 91 </dependency> 92 93 94 <!--9 https://mvnrepository.com/artifact/commons-logging/commons-logging --> 95 <dependency> 96 <groupId>commons-logging</groupId> 97 <artifactId>commons-logging</artifactId> 98 <version>1.2</version> 99 </dependency> 100 101 102 <!--10 https://mvnrepository.com/artifact/org.springframework/spring-jdbc --> 103 <dependency> 104 <groupId>org.springframework</groupId> 105 <artifactId>spring-jdbc</artifactId> 106 <version>4.3.6.RELEASE</version> 107 </dependency> 108 109 110 <!--11 https://mvnrepository.com/artifact/org.springframework/spring-orm --> 111 <dependency> 112 <groupId>org.springframework</groupId> 113 <artifactId>spring-orm</artifactId> 114 <version>4.3.6.RELEASE</version> 115 </dependency> 116 117 118 <!--12 https://mvnrepository.com/artifact/org.springframework/spring-tx --> 119 <dependency> 120 <groupId>org.springframework</groupId> 121 <artifactId>spring-tx</artifactId> 122 <version>4.3.6.RELEASE</version> 123 </dependency> 124 125 126 <!--13 https://mvnrepository.com/artifact/org.springframework/spring-web --> 127 <dependency> 128 <groupId>org.springframework</groupId> 129 <artifactId>spring-web</artifactId> 130 <version>4.3.6.RELEASE</version> 131 </dependency> 132 133 134 <!--14 https://mvnrepository.com/artifact/org.springframework/spring-webmvc --> 135 <dependency> 136 <groupId>org.springframework</groupId> 137 <artifactId>spring-webmvc</artifactId> 138 <version>4.3.6.RELEASE</version> 139 </dependency> 140 141 142 <!--15 https://mvnrepository.com/artifact/org.mybatis/mybatis --> 143 <dependency> 144 <groupId>org.mybatis</groupId> 145 <artifactId>mybatis</artifactId> 146 <version>3.4.6</version> 147 </dependency> 148 149 150 <!--16 https://mvnrepository.com/artifact/mysql/mysql-connector-java --> 151 <dependency> 152 <groupId>mysql</groupId> 153 <artifactId>mysql-connector-java</artifactId> 154 <version>5.1.38</version> 155 </dependency> 156 157 158 <!--17 https://mvnrepository.com/artifact/org.mybatis/mybatis-spring --> 159 <dependency> 160 <groupId>org.mybatis</groupId> 161 <artifactId>mybatis-spring</artifactId> 162 <version>1.3.2</version> 163 </dependency> 164 165 <!--18 https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api --> 166 <dependency> 167 <groupId>javax.servlet</groupId> 168 <artifactId>javax.servlet-api</artifactId> 169 <version>3.1.0</version> 170 </dependency> 171 172 <!--19 https://mvnrepository.com/artifact/javax.servlet/jstl --> 173 <dependency> 174 <groupId>javax.servlet</groupId> 175 <artifactId>jstl</artifactId> 176 <version>1.2</version> 177 </dependency> 178 179 180 <!--20 https://mvnrepository.com/artifact/taglibs/standard --> 181 <dependency> 182 <groupId>taglibs</groupId> 183 <artifactId>standard</artifactId> 184 <version>1.1.2</version> 185 </dependency> 186 187 <!--文件上传使用的jar--> 188 <!--21 https://mvnrepository.com/artifact/commons-io/commons-io --> 189 <dependency> 190 <groupId>commons-io</groupId> 191 <artifactId>commons-io</artifactId> 192 <version>2.4</version> 193 </dependency> 194 <!--22--> 195 <dependency> 196 <groupId>commons-fileupload</groupId> 197 <artifactId>commons-fileupload</artifactId> 198 <version>1.3.3</version> 199 </dependency> 200 201 <!--23 下载ajax封装数据json格式交互的jar--> 202 <dependency> 203 <groupId>com.fasterxml.jackson.core</groupId> 204 <artifactId>jackson-databind</artifactId> 205 <version>2.9.6</version> 206 </dependency> 207 208 <dependency> 209 <groupId>com.fasterxml.jackson.core</groupId> 210 <artifactId>jackson-core</artifactId> 211 <version>2.9.6</version> 212 </dependency> 213 214 <dependency> 215 <groupId>com.fasterxml.jackson.core</groupId> 216 <artifactId>jackson-annotations</artifactId> 217 <version>2.9.6</version> 218 </dependency> 219 220 <!--使用4的版本否则springmvc的xml--> 221 <dependency> 222 <groupId>com.github.pagehelper</groupId> 223 <artifactId>pagehelper</artifactId> 224 <version>4.1.6</version> 225 </dependency> 226 </dependencies> 227 228 </project>
pom.xml
3、在项目的webapp目录下的WEB-INF下构建springmvc的xml文件，即springmvc-servlet.xml
1 <?xml version="1.0" encoding="UTF-8" ?> 2 <beans xmlns="http://www.springframework.org/schema/beans" 3 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 4 xmlns:aop="http://www.springframework.org/schema/aop" 5 xmlns:context="http://www.springframework.org/schema/context" 6 xmlns:tx="http://www.springframework.org/schema/tx" 7 xmlns:mvc="http://www.springframework.org/schema/mvc" 8 xsi:schemaLocation="http://www.springframework.org/schema/beans 9 http://www.springframework.org/schema/beans/spring-beans.xsd 10 http://www.springframework.org/schema/aop 11 http://www.springframework.org/schema/aop/spring-aop.xsd 12 http://www.springframework.org/schema/context 13 http://www.springframework.org/schema/context/spring-context.xsd 14 http://www.springframework.org/schema/tx 15 http://www.springframework.org/schema/tx/spring-tx.xsd 16 http://www.springframework.org/schema/mvc 17 http://www.springframework.org/schema/mvc/spring-mvc.xsd 18 "> 19 <!--1.mvc 注解驱动 --> 20 <mvc:annotation-driven/> 21 <!--2.全局扫描包--> 22 <context:component-scan base-package="com"/> 23 <!--3.驱动管理数据源 --> 24 <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource"> 25 <property name="driverClassName" value="com.mysql.jdbc.Driver"/> 26 <property name="url" value="jdbc:mysql://localhost:3306/ar"/> 27 <property name="username" value="root"/> 28 <property name="password" value="123456"/> 29 </bean> 30 <!--4.数据源事务管理--> 31 <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> 32 <property name="dataSource" ref="dataSource"/> 33 </bean> 34 <!--5.事务注解驱动--> 35 <tx:annotation-driven transaction-manager="transactionManager"/> 36 <!--6.sqlsessionfactorybean--> 37 <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> 38 <property name="dataSource" ref="dataSource"/> 39 <!--映射xml文件需要类全路径别名的 配置，将某个包下的所有类全路径配置别名，别名默认是类名--> 40 <property name="typeAliasesPackage" value="com.pojo"/> 41 <!--引用映射xml文件--> 42 <property name="mapperLocations" value="classpath:mapper/*.xml"/> 43 </bean> 44 <!--7.映射扫描参数--> 45 <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> 46 <property name="basePackage" value="com.mapper"/> 47 </bean> 48 49 </beans>
springmvc-servlet.xml
4、在项目的webapp目录下的WEB-INF下构建web的xml文件，即web.xml
1 <!DOCTYPE web-app PUBLIC 2 "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" 3 "http://java.sun.com/dtd/web-app_2_3.dtd" > 4 5 <web-app> 6 <!--springmvc的过滤器，主要过滤乱码--> 7 <filter> 8 <filter-name>character</filter-name> 9 <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class> 10 <init-param> 11 <param-name>encoding</param-name> 12 <param-value>UTF-8</param-value> 13 </init-param> 14 </filter> 15 <filter-mapping> 16 <filter-name>character</filter-name> 17 <url-pattern>/*</url-pattern> 18 </filter-mapping> 19 20 <!--springmvc 核心拦截器--> 21 <servlet> 22 <servlet-name>springmvc</servlet-name> 23 <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> 24 </servlet> 25 <servlet-mapping> 26 <servlet-name>springmvc</servlet-name> 27 <url-pattern>*.do</url-pattern> 28 </servlet-mapping> 29 30 <welcome-file-list> 31 <welcome-file>show.do</welcome-file> 32 </welcome-file-list> 33 </web-app>
web.xml
5、在java目录下的com.pojo包下构建Emp.java和Dept.java文件
1 package com.pojo; 2 import org.springframework.stereotype.Component; 3 4 import java.io.Serializable; 5 import java.util.List; 6 /** 7 * 一方引用多方list集合 8 */ 9 @Component 10 public class Dept implements Serializable { 11 private Integer deptno ; 12 private String dname ; 13 private String loc ; 14 15 public Dept() { 16 } 17 18 public Dept(Integer deptno, String dname, String loc) { 19 this.deptno = deptno; 20 this.dname = dname; 21 this.loc = loc; 22 } 23 24 public Integer getDeptno() { 25 return deptno; 26 } 27 28 public void setDeptno(Integer deptno) { 29 this.deptno = deptno; 30 } 31 32 33 public String getDname() { 34 return dname; 35 } 36 37 public void setDname(String dname) { 38 this.dname = dname; 39 } 40 41 42 public String getLoc() { 43 return loc; 44 } 45 46 public void setLoc(String loc) { 47 this.loc = loc; 48 } 49 50 @Override 51 public String toString() { 52 return "Dept{" + 53 "deptno=" + deptno + 54 ", dname='" + dname + '\'' + 55 ", loc='" + loc + '\'' + 56 '}'; 57 } 58 }
Dept.java
1 package com.pojo; 2 3 import org.springframework.stereotype.Component; 4 5 import java.io.Serializable; 6 7 /** 8 * 多方引用一方对象 9 */ 10 @Component 11 public class Emp implements Serializable{ 12 private Integer empno ; 13 private String ename ; 14 private String job ; 15 private Integer mgr ; 16 private String hiredate ; 17 private Double sal ; 18 private Double comm ; 19 private Dept dept; 20 21 public Emp() { 22 } 23 24 public Emp(Integer empno, String ename, String job, Integer mgr, String hiredate, Double sal, Double comm, Dept dept) { 25 this.empno = empno; 26 this.ename = ename; 27 this.job = job; 28 this.mgr = mgr; 29 this.hiredate = hiredate; 30 this.sal = sal; 31 this.comm = comm; 32 this.dept = dept; 33 } 34 35 public Integer getEmpno() { 36 return empno; 37 } 38 39 public void setEmpno(Integer empno) { 40 this.empno = empno; 41 } 42 43 44 public String getEname() { 45 return ename; 46 } 47 48 public void setEname(String ename) { 49 this.ename = ename; 50 } 51 52 53 public String getJob() { 54 return job; 55 } 56 57 public void setJob(String job) { 58 this.job = job; 59 } 60 61 62 public Integer getMgr() { 63 return mgr; 64 } 65 66 public void setMgr(Integer mgr) { 67 this.mgr = mgr; 68 } 69 70 71 public String getHiredate() { 72 return hiredate; 73 } 74 75 public void setHiredate(String hiredate) { 76 this.hiredate = hiredate; 77 } 78 79 80 public Double getSal() { 81 return sal; 82 } 83 84 public void setSal(Double sal) { 85 this.sal = sal; 86 } 87 88 89 public Double getComm() { 90 return comm; 91 } 92 93 public void setComm(Double comm) { 94 this.comm = comm; 95 } 96 97 public Dept getDept() { 98 return dept; 99 } 100 101 public void setDept(Dept dept) { 102 this.dept = dept; 103 } 104 105 @Override 106 public String toString() { 107 return "Emp{" + 108 "empno=" + empno + 109 ", ename='" + ename + '\'' + 110 ", job='" + job + '\'' + 111 ", mgr=" + mgr + 112 ", hiredate='" + hiredate + '\'' + 113 ", sal=" + sal + 114 ", comm=" + comm + 115 ", dept=" + dept + 116 '}'; 117 } 118 }
Emp.java
6、在java目录下的com.mapper包下构建映射接口EmpMapper.java和DeptMapper.java文件
1 package com.mapper; 2 import com.pojo.Dept; 3 import org.springframework.stereotype.Repository; 4 5 import java.util.List; 6 @Repository 7 public interface DeptMapper { 8 List<Dept> selectAllDept(); 9 }
DeptMapper.java
1 package com.mapper; 2 import com.pojo.Emp; 3 import org.springframework.stereotype.Repository; 4 5 import java.util.List; 6 @Repository 7 public interface EmpMapper { 8 List<Emp> selectEmp(Emp emp); 9 int insertEmp(Emp emp); 10 int updateEmp(Emp emp); 11 int deleteEmp(Emp emp); 12 }
EmpMapper.java
7、在java目录下的com.service包下构建2个业务层接口EmpService.java 和DeptService.java文件，2个业务层接口实现类EmpServiceImpl.java 和DeptServiceImpl.java文件
1 package com.service; 2 3 import com.pojo.Dept; 4 5 import java.util.List; 6 7 public interface DeptService { 8 List<Dept> downOption(); 9 }
DeptService.java
1 package com.service; 2 3 import com.pojo.Emp; 4 5 import java.util.List; 6 7 public interface EmpService { 8 List<Emp> show(Emp emp); 9 int add(Emp emp); 10 int edit(Emp emp); 11 int del(Emp emp); 12 }
EmpService.java
1 package com.service; 2 3 import com.mapper.DeptMapper; 4 import com.pojo.Dept; 5 import org.springframework.beans.factory.annotation.Autowired; 6 import org.springframework.stereotype.Service; 7 8 import java.util.List; 9 @Service 10 public class DeptServiceImpl implements DeptService{ 11 @Autowired 12 private DeptMapper deptMapper; 13 14 15 @Override 16 public List<Dept> downOption() { 17 return deptMapper.selectAllDept(); 18 } 19 }
DeptServiceImpl.java
1 package com.service; 2 3 import com.mapper.EmpMapper; 4 import com.pojo.Emp; 5 import org.springframework.beans.factory.annotation.Autowired; 6 import org.springframework.stereotype.Service; 7 8 import javax.annotation.Resource; 9 import java.util.List; 10 /* 11 @Service的功能等同于代理对象在spring的xml文件中动态添加bean节点, 12 如果不指定名称，则底层代理在构建bean节点的时候id是类的第一个首字母小写 13 <bean id="empServiceImpl" class="com.service.EmpServiceImpl"/> 14 @Service(value = "empse")的功能等同于代理对象在spring的xml文件中动态添加id值为empse的bean节点 15 <bean id="empse" class="com.service.EmpServiceImpl"/> 16 */ 17 @Service 18 public class EmpServiceImpl implements EmpService { 19 /* 20 @Autowired是spring的资源包下注解，按照对象的类型进行自动注入， 21 和对象名称无关，只要类型是匹配的，代理就会在你需要的时候给你注入对象值 22 @Resource是javax包下的注解，按照对象属性名进行注入， 23 和对象名称关系密切，如果对象名称不匹配，则不能完成注入，会报错 24 总结：相比而言，使用@Resource的出错记录更大，因此我们常规选择使用@Autowired 25 */ 26 @Autowired 27 private EmpMapper empMapper; 28 29 @Override 30 public List<Emp> show(Emp emp) { 31 return empMapper.selectEmp(emp); 32 } 33 34 @Override 35 public int add(Emp emp) { 36 return empMapper.insertEmp(emp); 37 } 38 39 @Override 40 public int edit(Emp emp) { 41 return empMapper.updateEmp(emp); 42 } 43 44 @Override 45 public int del(Emp emp) { 46 return empMapper.deleteEmp(emp); 47 } 48 }
EmpServiceImpl.java
8、在java目录下的com.controller包下构建1个核心控制层类CenterController.java
1 package com.controller; 2 3 import com.pojo.Dept; 4 import com.pojo.Emp; 5 import com.service.DeptService; 6 import com.service.EmpService; 7 import org.springframework.beans.factory.annotation.Autowired; 8 import org.springframework.stereotype.Controller; 9 import org.springframework.ui.Model; 10 import org.springframework.web.bind.annotation.RequestMapping; 11 import javax.servlet.http.HttpServletRequest; 12 import javax.servlet.http.HttpServletResponse; 13 import javax.servlet.http.HttpSession; 14 import java.util.List; 15 @Controller 16 public class CenterController { 17 @Autowired 18 private DeptService deptService; 19 20 @Autowired 21 private EmpService empService; 22 23 @RequestMapping("/show.do") 24 public String showData(HttpSession session, Model model){ 25 List<Dept> deptlist=deptService.downOption(); 26 session.setAttribute("deptlist",deptlist); 27 28 List<Emp> emplist=empService.show(new Emp()); 29 // 功能等同于request.setAttribute(key，value) 30 model.addAttribute("emplist",emplist); 31 32 //默认跳转使用转发 33 return "main.jsp"; 34 } 35 36 37 @RequestMapping("/option.do") 38 public String showOption(Emp emp,Model model){ 39 List<Emp> emplist=empService.show(emp); 40 41 // 功能等同于request.setAttribute(key，value) 42 model.addAttribute("emplist",emplist); 43 model.addAttribute("deptno",emp.getDept().getDeptno()); 44 45 //默认跳转使用转发 46 return "main.jsp"; 47 } 48 49 @RequestMapping("/info.do") 50 public String showInfo(Emp emp,Model model){ 51 //根据主键编号查询只有一条数据 52 Emp emp2=empService.show(emp).get(0); 53 54 // 功能等同于request.setAttribute(key，value) 55 model.addAttribute("emp2",emp2); 56 57 //默认跳转使用转发 58 return "edit.jsp"; 59 } 60 @RequestMapping("/edit.do") 61 public String edit(Emp emp){ 62 //根据主键编号查询只有一条数据 63 System.out.println(empService.edit(emp)>0?"edit success":"edit fail");; 64 //使用重定向跳转 65 return "redirect:/show.do"; 66 } 67 68 @RequestMapping("/add.do") 69 public String add(Emp emp){ 70 //根据主键编号查询只有一条数据 71 System.out.println(empService.add(emp)>0?"add success":"add fail");; 72 //使用重定向跳转 73 return "redirect:/show.do"; 74 } 75 76 @RequestMapping("/del.do") 77 public String del(Emp emp){ 78 //根据主键编号查询只有一条数据 79 System.out.println(empService.del(emp)>0?"del success":"del fail");; 80 //使用重定向跳转 81 return "redirect:/show.do"; 82 } 83 }
CenterController.java
9、在resouces目录下构建1个系统日志记录文件log4j.properties
1 log4j.rootLogger=DEBUG, Console 2 #Console 3 log4j.appender.Console=org.apache.log4j.ConsoleAppender 4 log4j.appender.Console.layout=org.apache.log4j.PatternLayout 5 log4j.appender.Console.layout.ConversionPattern=%d [%t] %-5p [%c] - %m%n 6 7 log4j.logger.org.apache=INFO 8 log4j.logger.java.sql.ResultSet=INFO 9 log4j.logger.java.sql.Connection=DEBUG 10 log4j.logger.java.sql.Statement=DEBUG 11 log4j.logger.java.sql.PreparedStatement=DEBUG
log4j.properties
10、在resouces目录下的mapper目录下构建2个映射xml文件DeptMapper.xml和EmpMapper.xml
1 <?xml version="1.0" encoding="UTF-8" ?> 2 <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd"> 3 <!--配置规则：--> 4 <!--有代理的namespace值必须是映射接口全路径，sql节点的id值必须是映射接口中的方法名--> 5 <!--无代理的namespace值和sql节点的id值是任意的，但一般情况下和和有代理的原则一样--> 6 <mapper namespace="com.mapper.DeptMapper"> 7 <select id="selectAllDept" resultType="Dept"> 8 select * from dept 9 </select> 10 </mapper>
DeptMapper.xml
1 <?xml version="1.0" encoding="UTF-8" ?> 2 <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd"> 3 <mapper namespace="com.mapper.EmpMapper"> 4 <!-- 案例：select * from emp where empno=#{empno} or ename=#{ename} and job=#{job} 5 如果select节点中是以上sql语句，parameterType是Emp类型，则此情况可以使用where标签, 6 where标签的作用是如果if条件不满足则执行，如果满足if条件将会忽略where关键字后的 7 第一个or或and 8 select * from emp 9 <where> 10 <if test="empno!=null"> 11 empno=#{empno} 12 </if> 13 <if test="ename!=null"> 14 or ename=#{ename} 15 </if> 16 <if test="job!=null"> 17 and job=#{job} 18 </if> 19 </where> 20 --> 21 <!--if或when的test条件中的属性判断，必须从参数对象的第一层属性判断起，--> 22 <!--如果Emp类中有empno属性，有dept对象属性，则要判断empno值和dept中deptno的值，--> 23 <!--则写法是empno！=null，dept！=null && dept.deptno!=null--> 24 <select id="selectEmp" resultMap="empmap" parameterType="Emp"> 25 select d.dname,d.loc,e.* from emp e,dept d where e.deptno=d.deptno 26 <if test="empno!=null"> 27 and e.empno=#{empno} 28 </if> 29 <if test="ename!=null"> 30 and e.ename=#{ename} 31 </if> 32 <if test="job!=null"> 33 and e.job=#{job} 34 </if> 35 <if test="dept!=null and dept.deptno!=null"> 36 and e.deptno=#{dept.deptno} 37 </if> 38 </select> 39 40 <resultMap id="empmap" type="Emp"> 41 <!--因为当前多方配置，因此在resultMap中先配置多方的主键和普通列的映射--> 42 <id column="EMPNO" property="empno"/> 43 <result column="ENAME" property="ename"/> 44 <result column="JOB " property="job"/> 45 <result column="MGR" property="mgr"/> 46 <result column="HIREDATE" property="hiredate"/> 47 <result column="SAL" property="sal"/> 48 <result column="COMM" property="comm"/> 49 50 <!--因为在多方引用了一方的对象，因此在引用一方对象属性的地方配置association节点--> 51 <!--association节点的property属性对应的多方引用一方的对象属性名,--> 52 <!--javaType是多方引用一方的类类型即配置类的全路径--> 53 <!--column是多方关联一方的外键列的列名--> 54 <association property="dept" javaType="Dept" column="DEPTNO"> 55 <!--由于多方引用的了一方对象，因此在association对象节点下配置一方的主键和普通字段--> 56 <id column="DEPTNO" property="deptno"/> 57 <result column="DNAME" property="dname"/> 58 <result column="LOC" property="loc"/> 59 </association> 60 </resultMap> 61 62 <insert id="insertEmp" parameterType="Emp"> 63 INSERT INTO emp(empno, ename, job, mgr, hiredate, sal, comm, deptno) VALUES 64 (#{empno},#{ename},#{job},#{mgr},#{hiredate},#{sal},#{comm},#{dept.deptno}) 65 </insert> 66 67 <!--set标签的结束标签要在where条件之前--> 68 <update id="updateEmp" parameterType="Emp"> 69 UPDATE emp 70 <set> 71 <if test="ename!=null"> 72 ename=#{ename} , 73 </if> 74 <if test="job!=null"> 75 job=#{job} , 76 </if> 77 <if test="mgr!=null"> 78 mgr=#{mgr} , 79 </if> 80 <if test="hiredate!=null"> 81 hiredate=#{hiredate} , 82 </if> 83 <if test="sal!=null"> 84 sal=#{sal}, 85 </if> 86 <if test="comm!=null"> 87 comm=#{comm}, 88 </if> 89 <if test="dept!=null and dept.deptno!=null"> 90 deptno=#{dept.deptno} , 91 </if> 92 </set> 93 <include refid="wherecondition"/> 94 </update> 95 96 <delete id="deleteEmp" parameterType="Emp"> 97 delete from emp 98 <include refid="wherecondition"/> 99 </delete> 100 101 <!--定义公共的sql片段--> 102 <sql id="wherecondition"> 103 <where> 104 <if test="empno!=null"> 105 empno=#{empno} 106 </if> 107 </where> 108 </sql> 109 110 </mapper>
EmpMapper.xml
11、在项目的webapp目录下构建main.jsp
1 <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> 2 <%@ page contentType="text/html;charset=UTF-8" language="java" %> 3 <%@ page isELIgnored="false" %> 4 <html> 5 <head> 6 <title>首页</title> 7 </head> 8 <body> 9 <a href="add.jsp">添加</a> 10 <p> 11 <form action="option.do" method="post"> 12 <span>部门：</span> 13 <select name="dept.deptno"> 14 <option value="-1">--请选择--</option> 15 <c:forEach var="i" items="${deptlist}"> 16 <c:choose> 17 <c:when test="${deptno eq i.deptno}"> 18 <option value="${i.deptno}" selected="selected">${i.dname}</option> 19 </c:when> 20 <c:otherwise> 21 <option value="${i.deptno}">${i.dname}</option> 22 </c:otherwise> 23 </c:choose> 24 </c:forEach> 25 </select> 26 <input type="submit" value="查询"> 27 </form> 28 </p> 29 <table> 30 <tr> 31 <th>员工编号</th> 32 <th>员工姓名</th> 33 <th>员工薪资</th> 34 <th>部门名称</th> 35 <th>操作</th> 36 </tr> 37 <c:forEach var="i" items="${emplist}"> 38 <tr> 39 <td>${i.empno}</td> 40 <td>${i.ename}</td> 41 <td>${i.sal}</td> 42 <td>${i.dept.dname}</td> 43 <td> 44 <a href="info.do?empno=${i.empno}">修改</a> 45 | 46 <a href="del.do?empno=${i.empno}">删除</a> 47 </td> 48 </tr> 49 </c:forEach> 50 </table> 51 </body> 52 </html>
main.jsp
12、在项目的webapp目录下构建edit.jsp
1 <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> 2 <%@ page contentType="text/html;charset=UTF-8" language="java" %> 3 <%@ page isELIgnored="false" %> 4 <html> 5 <head> 6 <title>编辑信息</title> 7 </head> 8 <body> 9 <fieldset> 10 <legend>编辑员工信息</legend> 11 <form action="edit.do?empno=${emp2.empno}" method="post"> 12 <table> 13 <tr> 14 <th>部门名称：</th> 15 <td> 16 <select name="dept.deptno"> 17 <option value="-1">--请选择--</option> 18 <c:forEach var="i" items="${deptlist}"> 19 <c:choose> 20 <c:when test="${emp2.dept.deptno eq i.deptno}"> 21 <option value="${i.deptno}" selected="selected">${i.dname}</option> 22 </c:when> 23 <c:otherwise> 24 <option value="${i.deptno}">${i.dname}</option> 25 </c:otherwise> 26 </c:choose> 27 </c:forEach> 28 </select> 29 </td> 30 </tr> 31 <tr> 32 <th>员工姓名：</th> 33 <td><input type="text" name="ename" value="${emp2.ename}"/></td> 34 </tr> 35 <tr> 36 <th>员工薪资：</th> 37 <td><input type="text" name="sal" value="${emp2.sal}"/></td> 38 </tr> 39 <tr> 40 <td colspan="2" align="center"> 41 <input type="submit" value="提交"/> 42 <input type="reset" value="重置"/> 43 </td> 44 </tr> 45 </table> 46 </form> 47 </fieldset> 48 49 </body> 50 </html>
edit.jsp
13、在项目的webapp目录下构建add.jsp
1 <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> 2 <%@ page contentType="text/html;charset=UTF-8" language="java" %> 3 <%@ page isELIgnored="false" %> 4 <html> 5 <head> 6 <title>添加信息</title> 7 </head> 8 <body> 9 <fieldset> 10 <legend>添加员工信息</legend> 11 <form action="add.do" method="post"> 12 <table> 13 <tr> 14 <th>部门名称：</th> 15 <td> 16 <select name="dept.deptno"> 17 <option value="-1">--请选择--</option> 18 <c:forEach var="i" items="${deptlist}"> 19 <option value="${i.deptno}">${i.dname}</option> 20 </c:forEach> 21 </select> 22 </td> 23 </tr> 24 <tr> 25 <th>员工编号：</th> 26 <td><input type="text" name="empno"/></td> 27 </tr> 28 <tr> 29 <th>员工姓名：</th> 30 <td><input type="text" name="ename" /></td> 31 </tr> 32 <tr> 33 <th>员工薪资：</th> 34 <td><input type="text" name="sal" /></td> 35 </tr> 36 <tr> 37 <td colspan="2" align="center"> 38 <input type="submit" value="提交"/> 39 <input type="reset" value="重置"/> 40 </td> 41 </tr> 42 </table> 43 </form> 44 </fieldset> 45 </body> 46 </html>
add.jsp
14、部署启动项目查看效果
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