第一次接触java web开发，花费了一天半的时间，写了个简单的登录页面，以此文为记。
开发工具
Eclipse Luna Release (4.4.0) 已集成maven，maven目前的体会就是管理各种依赖
jetty为maven提供的一个插件，类似tomcat
struts2框架，MVC，action，jsp
mysql server 5.6
开发过程
1. 新建Maven web工程
Group Id: org.apache.maven.archetypes
Artifact Id: maven-archetype-webapp
2. 使用maven添加依赖及插件
在pom.xml的<dependencies></dependencies>间添加，或者是右键工程选择Maven->Add Dependency
jsp页面支持
<dependency> <groupId>javax.servlet</groupId> <artifactId>servlet-api</artifactId> <version>2.5</version> <scope>provided</scope> </dependency>
struts2
<dependency> <groupId>org.apache.struts</groupId> <artifactId>struts2-core</artifactId> <version>2.3.16</version> </dependency>
mysql connector
<dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.31</version> </dependency>
jetty
为插件，在<plugins></plugins>间添加，或者是右键工程选择Maven->Add Plugin，接着在pom.xml中写配置
<plugin> <groupId>org.mortbay.jetty</groupId> <artifactId>maven-jetty-plugin</artifactId> <version>6.1.10</version> <configuration> <scanIntervalSeconds>10</scanIntervalSeconds> <stopKey>foo</stopKey> <stopPort>9999</stopPort> </configuration> <executions> <execution> <id>start-jetty</id> <phase>pre-integration-test</phase> <goals> <goal>run</goal> </goals> <configuration> <scanIntervalSeconds>0</scanIntervalSeconds> <daemon>true</daemon> </configuration> </execution> <execution> <id>stop-jetty</id> <phase>post-integration-test</phase> <goals> <goal>stop</goal> </goals> </execution> </executions> </plugin>
编译源码的插件
<plugin> <artifactId>maven-compiler-plugin</artifactId> <version>2.3.2</version> <configuration> <source>1.6</source> <target>1.6</target> </configuration> </plugin>
注意plugin的层次
<build> <plugins> <plugin>...</plugin> </plugins> </build>
3. maven命令行
网上搜索资料，得知命令mvn jetty:run，可以启动jetty。
请教杨学长后，知道在Eclipse中，右键工程，选择run as中的run configurations，打开界面如下
红框部分，即是maven命令输入的地方，如jetty:run
4. struts2框架开发登录页面
4.1 web.xml中添加struts2过滤器
<filter> <filter-name>struts2</filter-name> <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class> </filter> <filter-mapping> <filter-name>struts2</filter-name> <url-pattern>/*</url-pattern> </filter-mapping>
4.2 struts.xml中添加action
<package name="struts2demo" namespace="/" extends="struts-default"> <action name="Login"> <result>login.jsp</result> </action> <action name="Welcome" class="struts2demo.WelcomeUserAction"> <result name="SUCCESS">welcome_user.jsp</result> <result name="ERROR">error.jsp</result> </action> </package>
4.3 MVC
V->login.jsp
<%@ page contentType="text/html; charset=UTF-8"%> <%@ taglib prefix="s" uri="/struts-tags"%> <html> <head></head> <body> <s:form action="Welcome"> <s:textfield name="username" label="Username"/> <s:password name="password" label="Password"/> <s:submit/> </s:form> </body> </html>
M->WelcomeUserAction.java
package struts2demo; import java.sql.*; public class WelcomeUserAction { //<s:textfield name="username"> you can get it from <s:property value="username"> private String username; private String password; //get and set method for struts2 fill in //Username is the label name public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } //"all struts logic here" public String execute() { // try { Class.forName("com.mysql.jdbc.Driver"); //System.out.println("Success loading Mysql Driver!"); } catch (Exception e) { //System.out.println("Error loading Mysql Driver!"); e.printStackTrace(); } // try { Connection connect = DriverManager.getConnection("jdbc:mysql://localhost:3306/zrss", "root", "1234"); String sql = "select * from user where name = ?"; PreparedStatement ps = connect.prepareStatement(sql); ps.setString(1, username); ResultSet rs = ps.executeQuery(); while (rs.next()) { if (rs.getString("password").equals(password)) { return "SUCCESS"; } } } catch (Exception e) { e.printStackTrace(); } return "ERROR"; } }
C->forward to SUCCESS(welcome_user.jsp) or ERROR(error.jsp)
5. 参考资料
http://www.cnblogs.com/fnng/archive/2011/12/16/2290587.html maven的命令行使用
http://www.mkyong.com/struts2/struts-2-hello-world-example/ struts2的一个简单例子