本系列文章旨在记录和总结自己在Java Web开发之路上的知识点、经验、问题和思考，希望能帮助更多（Java）码农和想成为（Java）码农的人。
目录
- 介绍
- 工程结构
- POM文件
- Web部署描述符 – web.xml
- Spring IoC配置元数据 – dispatcher.xml
- Java代码 – 控制器层
- Java代码 – 服务层
- Java代码 – 实体类
- 静态页面 – login.html
- JSP 页面
介绍
本篇文章给出截止到 之时，租房网应用的完整代码。
工程结构
POM文件
<project xmlns="#34; xmlns:xsi="#34; xsi:schemaLocation=" #34;> <modelVersion>4.0.0</modelVersion> <groupId>house-renter</groupId> <artifactId>house-renter</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>war</packaging> <dependencies> <!-- --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>5.2.1.RELEASE</version> </dependency> <!-- --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>5.2.1.RELEASE</version> </dependency> <!-- --> <dependency> <groupId>org.apache.taglibs</groupId> <artifactId>taglibs-standard-impl</artifactId> <version>1.2.5</version> </dependency> <!-- --> <dependency> <groupId>org.apache.taglibs</groupId> <artifactId>taglibs-standard-spec</artifactId> <version>1.2.5</version> </dependency> <!-- --> <dependency> <groupId>com.h2database</groupId> <artifactId>h2</artifactId> <version>1.4.200</version> </dependency> <!-- --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> <version>5.2.1.RELEASE</version> </dependency> <!-- --> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid</artifactId> <version>1.1.21</version> </dependency> </dependencies> <build> <plugins> <plugin> <artifactId>maven-compiler-plugin</artifactId> <version>3.8.0</version> <configuration> <source>1.8</source> <target>1.8</target> </configuration> </plugin> <plugin> <artifactId>maven-war-plugin</artifactId> <version>3.2.1</version> <configuration> <warSourceDirectory>WebContent</warSourceDirectory> </configuration> </plugin> </plugins> </build> </project>
Web部署描述符 – web.xml
主要是用来配置 Spring MVC 的 DispatcherServlet 。
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="#34; xmlns="#34; xsi:schemaLocation=" #34; id="WebApp_ID" version="3.0"> <display-name>house-renter</display-name> <welcome-file-list> <welcome-file>index.html</welcome-file> <welcome-file>index.htm</welcome-file> <welcome-file>index.jsp</welcome-file> <welcome-file>default.html</welcome-file> <welcome-file>default.htm</welcome-file> <welcome-file>default.jsp</welcome-file> </welcome-file-list> <filter> <filter-name>characterEncodingFilter</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> <init-param> <param-name>forceEncoding</param-name> <param-value>true</param-value> </init-param> </filter> <filter-mapping> <filter-name>characterEncodingFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <servlet> <servlet-name>dispatcher</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value>/WEB-INF/dispatcher.xml</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>dispatcher</servlet-name> <url-pattern>*.action</url-pattern> </servlet-mapping> </web-app>
Spring IoC配置元数据 – dispatcher.xml
主要用来开启组件扫描、配置DataSource和JdbcTemplate这两个Bean。
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="#34; xmlns:context="#34; xmlns:xsi="#34; xsi:schemaLocation=" #34;> <context:component-scan base-package="houserenter"/> <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close"> <property name="url" value="jdbc:h2:~/h2db/houserenter" /> <property name="username" value="sa" /> <property name="password" value="" /> <property name="maxActive" value="20" /> <property name="initialSize" value="1" /> <property name="maxWait" value="60000" /> <property name="minIdle" value="1" /> </bean> <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate"> <constructor-arg ref="dataSource" /> </bean> </beans>
Java代码 – 控制器层
package houserenter.controller;
import java.io.UnsupportedEncodingException;
import org.springframework.beans.factory. annotation .Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.servlet.ModelAndView;
import houserenter.entity.House;
import houserenter.service.HouseService;
@Controller
public class HouseRenterController {
@Autowired
private HouseService houseService;
@GetMapping("/test.action")
@ResponseBody
public String test() {
return "hello";
}
@PostMapping("/login.action")
public ModelAndView postLogin(String userName, String password) {
//这里需要验证用户是否已经注册，省略
System.out.println("userName: " + userName + ", password: " + password);
ModelAndView mv = new ModelAndView();
//重定向到查找感兴趣房源列表的动作
mv.setViewName("redirect:houses.action?userName=" + userName);
return mv;
}
@GetMapping("/houses.action")
public ModelAndView getHouses(String userName) {
//这里需要验证用户是否登录，省略
ModelAndView mv = new ModelAndView();
//查找感兴趣房源并绑定到相应JSP页面，然后将请求转发到该页面
mv.addObject("mockHouses", houseService.findHousesInterested(userName));
mv.setViewName("houses.jsp?userName=" + userName);
return mv;
}
@GetMapping("/house-details.action")
public ModelAndView getHouseDetails(String userName, String houseId) {
// 这里需要验证用户是否登录，省略
ModelAndView mv = new ModelAndView();
//查找房源详情并绑定到相应JSP页面，然后将请求转发到该页面
mv.addObject("target", houseService.findHouseById(houseId));
mv.setViewName("house-details.jsp?userName=" + userName);
return mv;
}
@GetMapping("/house-form.action")
public ModelAndView getHouseForm(String userName, String houseId) {
// 这里需要验证用户是否登录，省略
ModelAndView mv = new ModelAndView();
//查找房源详情并绑定到相应JSP页面，然后将请求转发到该页面
mv.addObject("target", houseService.findHouseById(houseId));
mv.setViewName("house-form.jsp?userName=" + userName);
return mv;
}
@PostMapping("/house-form.action")
public ModelAndView postHouseForm(String userName, House house) throws UnsupportedEncodingException {
// 这里需要验证用户是否登录，省略
//更新指定房源的详情
houseService.updateHouseById(house);
//将请求转发到查找房源详情的动作
ModelAndView mv = new ModelAndView();
mv.setViewName("redirect:house-details.action?userName=" + userName + "&houseId=" + house.getId());
return mv;
}
} Java代码 – 服务层
package houserenter.service;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.List;
import javax.annotation.PostConstruct;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.RowMapper;
import org.springframework.stereotype.Service;
import houserenter.entity.House;
@Service
public class HouseService {
@Autowired
private JdbcTemplate jdbcTemplate;
@PostConstruct
public void generateMockHouses() {
jdbcTemplate.execute("drop table if exists house");
jdbcTemplate.execute("create table house(id varchar(20) primary key, name varchar(100), detail varchar(500))");
jdbcTemplate.update("insert into house values(?, ?, ?)", "1", "金科嘉苑3-2-1201", "详细信息");
jdbcTemplate.update("insert into house values(?, ?, ?)", "2", "万科橙9-1-501", "详细信息");
}
public List<House> findHousesInterested(String userName) {
// 这里查找该用户感兴趣的房源，省略，改为用模拟数据
return jdbcTemplate.query(
"select id,name,detail from house",
new HouseMapper());
}
public House findHouseById(String houseId) {
return jdbcTemplate.queryForObject(
"select id,name,detail from house where id = ?",
new Object[]{houseId},
new HouseMapper());
}
public void updateHouseById(House house) {
jdbcTemplate.update(
"update house set id=?, name=?, detail=? where id=?",
house.getId(), house.getName(), house.getDetail(), house.getId());
}
private static final class HouseMapper implements RowMapper<House> {
@Override
public House mapRow(ResultSet rs, int rowNum) throws SQLException {
return new House(rs.getString("id"), rs.getString("name"), rs.getString("detail"));
}
}
} Java代码 – 实体类
package houserenter.entity;
public class House {
private String id;
private String name;
private String detail;
public House(String id, String name, String detail) {
super();
this.id = id;
this.name = name;
this.detail = detail;
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getDetail() {
return detail;
}
public void setDetail(String detail) {
this.detail = detail;
}
@Override
public String toString() {
return "House [id=" + id + ", name=" + name + ", detail=" + detail + "]";
}
}
静态页面 – login.html
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>租房网 - 登录</title> </head> <body> <form action="login.action" method="post"> <label for="user_name">用户名</label><input type="text" id="user_name" name="userName" /> <label for="password">密码</label><input type="password" id="password" name="password" /> <input type="submit" value="登录" /> </form> </body> </html>
JSP页面
include.jsp：
<%@ page language="java" contentType ="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@ page import="java.util.List" %>
<%@ page import="houserenter.entity.House" %>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>租房网</title>
</head>
<body>
<h1>你好，${param.userName}！欢迎来到租房网！ <a href="login.html">退出</a></h1>
<br><br> houses.jsp：
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@ include file="include.jsp"%>
<%@ taglib uri="#34; prefix="c" %>
<h6>共找到你感兴趣的房源 ${mockHouses.size()} 条</h6>
<ul>
<c:forEach var="house" items="${mockHouses}">
<li><h2><a href="house-details.action?userName=${param.userName}&houseId=${house.id}">${house.name}</a></h2></li>
</c:forEach>
</ul>
</body>
</html> house-details.jsp：
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@ include file="include.jsp"%>
<h2>${target.name}<a href="house-form.action?userName=${param.userName}&houseId=${target.id}">编辑</a></h2>
<h3>${target.detail}</h3>
<h4><a href="houses.action?userName=${param.userName}">回到列表</a></h4>
</body>
</html> house-form.jsp：
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@ include file="include.jsp"%>
<form action="house-form.action" method="post">
<input type="hidden" name="userName" value="${param.userName}"/>
<input type="hidden" name="id" value="${target.id}"/>
<label for="house_name">房源名字：</label><input type="text" id="house_name" name="name" value="${target.name}" />
<label for="house_detail">房源详细信息：</label><input type="text" id="house_detail" name="detail" value="${target.detail}" />
<input type="submit" value="提交" />
</form>
</body>
</html> 
