手動搭建ssm框架（適宜新手）
阿新 • • 發佈：2019-01-22
在公司一直做分散式的專案，專案基本拿過來的時候架構師把整體框架，所用技術全都選擇好了，我們只要按照約束去寫程式碼就好了，沒事，我就想看自己是否還能搭建出ssm框架，說實話，還是耗費力氣的，不過總算弄出來了，適合顯新手。
我的jdk是1.7版本的
首先我們新建一個maven專案如圖所示：我勾選這個是因為之前用提供的模板最後專案總是目錄結構不太對，各種原因導致，索性我就不用模板，這樣絕對可以，當然大家根據自己喜好來。
點選next，選擇war包，finish
finish之後我們的專案會報錯，那是因為我們沒有web.xml導致的，所以我們滑鼠右鍵專案會出現如圖：
然後我們點選下箭頭所指的那個 生成web.xml就不會報錯了。
先提出整體專案的結構圖：
資料庫指令碼：
CREATE DATABASE maven; USE maven; CREATE TABLE `user` ( `id` INT(12) NOT NULL AUTO_INCREMENT, `name` VARCHAR(50) NOT NULL, `password` VARCHAR(50) NOT NULL, `age` INT(9) NOT NULL, PRIMARY KEY (`id`) ) ENGINE=INNODB AUTO_INCREMENT=12 DEFAULT CHARSET=utf8; INSERT INTO `user`(`id`,`name`,`password`,`age`) VALUES (1,'admin','admin',22);
pom.xml
<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/maven-v4_0_0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.csq.study</groupId> <artifactId>ssm-test</artifactId> <packaging>war</packaging> <version>0.0.1-SNAPSHOT</version> <name>Maven_Project Maven Webapp</name> <url>http://maven.apache.org</url> <!-- 用來設定版本號 --> <properties> <spring.version>4.0.2.RELEASE</spring.version> <mybatis.version>3.2.8</mybatis.version> <slf4j.version>1.7.12</slf4j.version> <log4j.version>1.2.17</log4j.version> </properties> <!-- 用到的jar包 --> <dependencies> <!-- 單元測試 --> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.11</version> <!-- 表示開發的時候引入，釋出的時候不會載入此包 --> <scope>test</scope> </dependency> <!-- java ee包 --> <dependency> <groupId>javax</groupId> <artifactId>javaee-api</artifactId> <version>7.0</version> </dependency> <!-- spring框架包 start --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-test</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-core</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-oxm</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-jdbc</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-aop</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context-support</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-expression</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-web</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-aspects</artifactId> <version>${spring.version}</version> </dependency> <!-- spring框架包 end --> <!-- mybatis框架包 start --> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>${mybatis.version}</version> </dependency> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis-spring</artifactId> <version>1.2.2</version> </dependency> <!-- mybatis框架包 end --> <!-- 資料庫驅動 --> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.35</version> </dependency> <!-- 匯入dbcp的jar包，用來在applicationContext.xml中配置資料庫 --> <dependency> <groupId>commons-dbcp</groupId> <artifactId>commons-dbcp</artifactId> <version>1.4</version> </dependency> <!-- jstl標籤類 --> <dependency> <groupId>jstl</groupId> <artifactId>jstl</artifactId> <version>1.2</version> </dependency> <dependency> <groupId>taglibs</groupId> <artifactId>standard</artifactId> <version>1.1.2</version> </dependency> <!-- log start --> <dependency> <groupId>log4j</groupId> <artifactId>log4j</artifactId> <version>${log4j.version}</version> </dependency> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-api</artifactId> <version>${slf4j.version}</version> </dependency> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-log4j12</artifactId> <version>${slf4j.version}</version> </dependency> <!-- log END --> <!-- Json --> <!-- 格式化物件，方便輸出日誌 --> <dependency> <groupId>com.alibaba</groupId> <artifactId>fastjson</artifactId> <version>1.2.6</version> </dependency> <dependency> <groupId>org.codehaus.jackson</groupId> <artifactId>jackson-mapper-asl</artifactId> <version>1.9.13</version> </dependency> <!-- 上傳元件包 start --> <dependency> <groupId>commons-fileupload</groupId> <artifactId>commons-fileupload</artifactId> <version>1.3.1</version> </dependency> <dependency> <groupId>commons-io</groupId> <artifactId>commons-io</artifactId> <version>2.4</version> </dependency> <dependency> <groupId>commons-codec</groupId> <artifactId>commons-codec</artifactId> <version>1.10</version> </dependency> <!-- 上傳元件包 end --> <!-- AL相關新增 --> <dependency> <groupId>net.sourceforge.jexcelapi</groupId> <artifactId>jxl</artifactId> <version>2.6</version> </dependency> <dependency> <groupId>org.apache.poi</groupId> <artifactId>poi</artifactId> <version>3.8</version> </dependency> <dependency> <groupId>org.apache.poi</groupId> <artifactId>poi-ooxml</artifactId> <version>3.9</version> </dependency> <!-- AL相關新增 --> </dependencies> <build> <finalName>ssm-test</finalName> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <version>2.3.2</version> <configuration> <source>1.7</source> <target>1.7</target> </configuration> </plugin> </plugins> </build> </project>
2.在src/main/resources下新增如下配置檔案
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" xmlns:p="http://www.springframework.org/schema/p"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.1.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd">
<!--表示 使用註解式注入 -->
<context:annotation-config />
<!-- 自動掃描 controller所在的包-->
<context:component-scan base-package="com.csq" />
<import resource="spring-dao.xml"/>
<import resource="spring-db.xml"/>
<import resource="spring-tx.xml"/>
</beans>jdbc.properties
driver=com.mysql.jdbc.Driver
url=jdbc:mysql://127.0.0.1:3306/maven
username=root
password=root
#定義初始連線數
initialSize=0
#定義最大連線數
maxActive=20
#定義最大空閒
maxIdle=20
#定義最小空閒
minIdle=1
#定義最長等待時間
maxWait=60000
log4j.properties
#定義LOG輸出級別
log4j.rootLogger=INFO,Console,File
#定義日誌輸出目的地為控制檯
log4j.appender.Console=org.apache.log4j.ConsoleAppender
log4j.appender.Console.Target=System.out
#可以靈活地指定日誌輸出格式，下面一行是指定具體的格式
log4j.appender.Console.layout = org.apache.log4j.PatternLayout
log4j.appender.Console.layout.ConversionPattern=[%c] - %m%n
#檔案大小到達指定尺寸的時候產生一個新的檔案
log4j.appender.File = org.apache.log4j.RollingFileAppender
#指定輸出目錄
log4j.appender.File.File = logs/ssm.log
#定義檔案最大大小
log4j.appender.File.MaxFileSize = 10MB
# 輸出所以日誌，如果換成DEBUG表示輸出DEBUG以上級別日誌
log4j.appender.File.Threshold = ALL
log4j.appender.File.layout = org.apache.log4j.PatternLayout
log4j.appender.File.layout.ConversionPattern =[%p] [%d{yyyy-MM-dd HH\:mm\:ss}][%c]%m%nspring-dao.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:p="http://www.springframework.org/schema/p"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.1.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd">
<!-- DAO介面所在包名，Spring會自動查詢其下的類 -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.csq.study.dao" />
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property>
</bean>
</beans>spring-db.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:p="http://www.springframework.org/schema/p"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.1.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd">
<!-- 引入配置檔案 -->
<bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="location" value="classpath:jdbc.properties" />
</bean>
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
<property name="driverClassName" value="${driver}" />
<property name="url" value="${url}" />
<property name="username" value="${username}" />
<property name="password" value="${password}" />
<!-- 初始化連線大小 -->
<property name="initialSize" value="${initialSize}"></property>
<!-- 連線池最大數量 -->
<property name="maxActive" value="${maxActive}"></property>
<!-- 連線池最大空閒 -->
<property name="maxIdle" value="${maxIdle}"></property>
<!-- 連線池最小空閒 -->
<property name="minIdle" value="${minIdle}"></property>
<!-- 獲取連線最大等待時間 -->
<property name="maxWait" value="${maxWait}"></property>
</bean>
<!-- spring和MyBatis完美整合，不需要mybatis的配置對映檔案 -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
<!-- 自動掃描mapping.xml檔案 -->
<property name="mapperLocations" value="classpath:com/csq/study/dao/*.xml""></property>
</bean>
</beans>spring-tx.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:p="http://www.springframework.org/schema/p"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.1.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-3.1.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-3.1.xsd">
<!-- (事務管理)transaction manager, use JtaTransactionManager for global tx -->
<bean id="transactionManager"
class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource" />
</bean>
<!-- 配置參與事務的類 -->
<aop:config>
<aop:pointcut id="allServiceMethod" expression="execution(* com.csq.study.service.*.*(..))"/>
<aop:advisor pointcut-ref="allServiceMethod" advice-ref="TxAdvice" />
</aop:config>
<!-- 使用宣告方式配置事務 -->
<tx:advice id="TxAdvice" transaction-manager="transactionManager">
<tx:attributes>
<tx:method name="*" propagation="REQUIRED" rollback-for="java.lang.Exception"/>
</tx:attributes>
</tx:advice>
</beans>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:p="http://www.springframework.org/schema/p"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.1.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd">
<!-- 添加註解驅動 -->
<mvc:annotation-driven />
<mvc:default-servlet-handler/>
<!-- 設定使用註解的類所在的包 -->
<context:component-scan base-package="com.csq.study.controller" />
<!-- 定義跳轉的檔案的前後綴 ，檢視模式配置-->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<!-- 自動給後面action的方法return的字串加上字首和字尾，可跳到對應的jsp。方便我們程式碼的書寫 -->
<property name="prefix" value="/WEB-INF/jsp/" />
<property name="suffix" value=".jsp" />
</bean>
<!-- SpringMVC上傳檔案時，需要配置MultipartResolver處理器-->
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<!-- 預設編碼 -->
<property name="defaultEncoding" value="utf-8" />
<!-- 檔案大小最大值 -->
<property name="maxUploadSize" value="10485760000" />
<!-- 記憶體中的最大值 -->
<property name="maxInMemorySize" value="40960" />
</bean>
</beans>controller層：
package com.csq.study.controller;
import java.util.List;
import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import com.csq.study.service.UserService;
import com.csq.study.vo.User;
@Controller
@RequestMapping("/user")
public class UserController {
@Resource
private UserService userService;
@RequestMapping("/userListInfo")
public String userList(HttpServletRequest request,Model model){
List<User> list = userService.getAllUser();
model.addAttribute("list", list);
return "userListInfo";
}
@RequestMapping("/showUser")
public String showUser(HttpServletRequest request,Model model){
System.out.println(request.getParameter("id"));
int userId = Integer.parseInt(request.getParameter("id"));
User user = userService.getUserById(userId);
model.addAttribute("user", user);
return "showUserPage";
}
@RequestMapping("/addUserUI")
public String addUserUI(){
return "addUserUI";
}
@RequestMapping("/addUser")
public String addUser(HttpServletRequest request,Model model){
User user = new User();
user.setName(String.valueOf(request.getParameter("name")));
user.setPassword(String.valueOf(request.getParameter("password")));
user.setAge(Integer.parseInt(String.valueOf(request.getParameter("age"))));
userService.addUser(user);
return "redirect:/user/userListInfo";
}
}service介面：
package com.csq.study.service;
import java.util.List;
import com.csq.study.vo.User;
public interface UserService {
public User getUserById(int userId);
public void insertUser(User user);
public void addUser(User user);
public List<User> getAllUser();
}serviceImpl:
package com.csq.study.serviceImpl;
import java.util.List;
import javax.annotation.Resource;
import org.springframework.stereotype.Service;
import com.csq.study.dao.UserDao;
import com.csq.study.service.UserService;
import com.csq.study.vo.User;
@Service("userService")
public class UserServiceImpl implements UserService {
@Resource
private UserDao userDao;
public User getUserById(int userId) {
return userDao.queryById(userId);
}
public void insertUser(User user) {
userDao.insertUser(user);
}
public void addUser(User user) {
userDao.insertUser(user);
}
@Override
public List<User> getAllUser() {
return userDao.getAllUser();
}
}dao:
package com.csq.study.dao;
import java.util.List;
import com.csq.study.vo.User;
public interface UserDao {
public User queryById(Integer id);
public List<User> getAllUser();
public void insertUser(User user);
public void updateUser(User user);
}mapper.xml檔案：這個可以自己用逆向工程工具生成，當然簡單的我們自己寫，也可以鍛鍊鍛鍊
<?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="com.csq.study.dao.UserDao" >
<resultMap id="BaseResultMap" type="com.csq.study.vo.User">
<result column="id" property="id" jdbcType="INTEGER" />
<result column="name" property="name" jdbcType="VARCHAR" />
<result column="password" property="password" jdbcType="VARCHAR" />
<result column="age" property="age" jdbcType="INTEGER" />
</resultMap>
<sql id="Base_Column_List">
id, name, password, age
</sql>
<!-- 查詢使用者-->
<select id="queryById" resultMap="BaseResultMap"
parameterType="java.lang.Integer">
select
<include refid="Base_Column_List" />
from user
where id = #{id,jdbcType=INTEGER}
</select>
<!-- 查詢使用者-->
<select id="getAllUser" resultMap="BaseResultMap">
select
<include refid="Base_Column_List" />
from user
</select>
<!-- 插入使用者 -->
<insert id="insertUser" parameterType="com.csq.study.vo.User">
insert into user
<trim prefix="(" suffix=")" suffixOverrides="," >
<if test="id != null" >
id,
</if>
<if test="name != null" >
name,
</if>
<if test="password != null" >
password,
</if>
<if test="age != null" >
age,
</if>
</trim>
<trim prefix="values (" suffix=")" suffixOverrides="," >
<if test="id != null" >
#{id,jdbcType=INTEGER},
</if>
<if test="name != null" >
#{name,jdbcType=VARCHAR},
</if>
<if test="password != null" >
#{password,jdbcType=VARCHAR},
</if>
<if test="age != null" >
#{age,jdbcType=INTEGER},
</if>
</trim>
</insert>
<!-- 刪除使用者 -->
<delete id="deleteById" parameterType="java.lang.Integer">
delete from user
where id = #{id,jdbcType=INTEGER}
</delete>
<!-- 更新使用者 -->
<update id="updateUser" parameterType="com.csq.study.vo.User" >
update user
<set >
<if test="name != null" >
name = #{name,jdbcType=VARCHAR},
</if>
<if test="password != null" >
password = #{password,jdbcType=VARCHAR},
</if>
<if test="age != null" >
age = #{age,jdbcType=INTEGER},
</if>
</set>
where id = #{id,jdbcType=INTEGER}
</update>
</mapper>實體類User:
package com.csq.study.vo;
public class User {
private int id;
private String name;
private String password;
private int age;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
}
在WEB-INF下新建一個資料夾jsp，裡面放如下的jsp
addUserUI.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'addUser.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
<form id="addUser" action="user/addUser" method="post">
userName: <input id="name" name="name" /><br/>
password: <input id="password" name="password" /><br/>
age: <input id="age" name="age"/><br/>
<input type="submit" value="新增新使用者"/>
</form>
</body>
</html>showUserPage.jsp
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'showUser.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
${user.name }<br>
</body>
</html>userListInfo.jsp
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'showUser.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
<c:forEach items="${list }" var="u">
名稱：${u.name}
年齡：${u.age }
<br/>
</c:forEach>
</body>
</html>ok。專案寫完 我們放在tomcat上執行，然後輸入：
本專案中容易出現的錯誤：
這是訪問路徑寫的不對，正確的訪問是：
tomcat啟動報錯：大部分是配置檔案和web.xml中掃描的路徑又出錯，自己根據報錯逐一檢查就可以了。