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【郑州校区】网上商城的实战的案例的数据库设计及开发...
1.1.1 需求： 1.1.2 数据库设计:1.1.3 网上商城用户模块的代码实现:(前台)1.1.3.1 编写一个通用的Servlet:传统方式的开发一个请求对应一个Servlet:这样的话会导致一个模块的Servlet过多,导致整个项目的Servlet都会很多.能不能做一个处理?让一个模块致用一个Servlet处理请求. 注册:http://localhost:8080/store_2.0/UserServlet?method=regist 登录:http://localhost:8080/store_2.0/UserServlet?method=login 激活:http://localhost:8080/store_2.0/UserServlet?method=active 商品查询所有：http://localhost:8080/store_2.0/ProductServlet?method=findAll 商品查询某个：http://localhost:8080/store_2.0/ProductServlet?method=findById 传统: [AppleScript] 纯文本查看 复制代码 public class UserServlet extends HttpServlet{
public void service(HttpServletRequest req,HttpServletResponse resp){
// 接收参数:
String methodName = request.getParameter(“method”);
if(“regist”.equals(methodName)){
regist(req,resp);
}else if(“login”.equals(methodName)){
login(req,resp);
}
}
public void regist(HttpServletRequest req,HttpServletResponse resp){
}
public void login(HttpServletRequest req,HttpServletResponse resp){
}
}
public class ProductServlet extends HttpServlet{
public void service(HttpServletRequest req,HttpServletResponse resp){
// 接收参数:
String methodName = request.getParameter(“method”);
if(“findAll”.equals(methodName)){
findAll(req,resp);
}else if(“findById”.equals(methodName)){
findById(req,resp);
}
}
public void findAll(HttpServletRequest req,HttpServletResponse resp){
}
public void findById(HttpServletRequest req,HttpServletResponse resp){
}
}
反射: [AppleScript] 纯文本查看 复制代码 public class BaseServlet extends HttpServlet{
public void service(HttpServletRequest req,HttpServletResponse resp){
// http://localhost:8080/store_2.0/UserServlet?method=regist
// http://localhost:8080/store_2.0/ProductServlet?method=findAll
String methodName = request.getParameter(“method”);
// 获得Class:
Class clazz = this.getClass();
Method method = clazz.getMethod(methodName,HttpServletRequest.class,HttpSerlvetResponse.class);
String path = (String)method.invoke(this,req,resp);
if(path != null){
req.getRequestDispatcher(path).forward(req,resp);
}
}
}
public class UserServlet extends BaseServlet {
public String regist(HttpServletRequest req,HttpServletResponse resp){
return “/login.jsp”;
}
public String login(HttpServletRequest req,HttpServletResponse resp){
return “/index.jsp”;
}
}
public class ProductServlet extends BaseServlet{
public String findAll(HttpServletRequest req,HttpServletResponse resp){
}
public String findById(HttpServletRequest req,HttpServletResponse resp){
}
}【步骤一】：引入开发jar包 * mysql 1 * c3p0 1 * dbutils 1 * beanutils 2 * jstl 2 * mail 1 * fileupload 2 【步骤二】：创建包结构: 【步骤三】：引入工具类和配置文件： 【步骤四】：编写通用的Servlet: 传智播客·黑马程序员郑州校区地址 河南省郑州市 高新区长椿路11号大学科技园（西区）东门8号楼三层 联系电话 0371-56061160/61/62 来校路线 地铁一号线梧桐街站A口出 | 
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