DelUserAction代码。
package com.bjpowernode.servlet;
importjavax.servlet.http.HttpServletRequest;
importjavax.servlet.http.HttpServletResponse;
public class DelUserActionimplements Action {
@Override
public String execute(HttpServletRequest request,HttpServletResponse response) throws Exception {
String username = request.getParameter("username");
//String sex = request.getParameter("sex");
//...........
//调用业务逻辑.
UserManager userManager = new UserManager();
try
{
userManager.del(username);
}catch(Exceptione)
{
return"del_error.jsp";
}
return"/del_success.jsp";
}
}
ModifyUserAction代码。
package com.bjpowernode.servlet;
importjavax.servlet.http.HttpServletRequest;
importjavax.servlet.http.HttpServletResponse;
public class ModifyUserActionimplements Action {
@Override
public String execute(HttpServletRequest request,HttpServletResponse response) throwsException {
String username = request.getParameter("username");
//String sex = request.getParameter("userId");
//...........等其他...
//调用业务逻辑.
UserManager userManager = new UserManager();
userManager.modify(username);
return"/modify_success.jsp";
}
}
QueryUserAction代码。
package com.bjpowernode.servlet;
import java.util.List;
importjavax.servlet.http.HttpServletRequest;
importjavax.servlet.http.HttpServletResponse;
public class QueryUserActionimplements Action {
@Override
public String execute(HttpServletRequest request,HttpServletResponse response) throwsException {
String username = request.getParameter("username");
//Stringsex = request.getParameter("userId");
//其他查询条件.
//...........等其他...
//调用业务逻辑.
UserManager userManager = new UserManager();
List userList = userManager.query(username);
request.setAttribute("userList",userList);
return"/query_success.jsp";//转向路径都可以通过配置文件读取。
}
}
这样使用多态方式调用不同的Action，转向代码如下所示。
//用多态的方式.
Action action = null;
if("/servlet/delUser".equals(path))
{
action= new DelUserAction();
}else if("/servlet/addUser".equals(path))
{
action= new AddUserAction();
}else if("/servlet/modifyUser".equals(path))
{
action= new ModifyUserAction();
}else if("/servlet/queryUser".equals(path))
{
action= new QueryUserAction();
}else
{
throw new RuntimeException("请求失败!");
}
//取得action后传递过去。动态调用ACtion中的execute方法。
String forward = null;
try{
forward= action.execute(request,response);
}catch (Exception e) {
e.printStackTrace();
}
//根据路径完成转向。
request.getRequestDispatcher(forward).forward(request, response);
上述调用不同的action，我们可以把不同的请求和对应的action配置到自己的xml文件中。配置哪个请求对应哪个Action。
/del_success.jsp /del_error.jsp /add_success.jsp /add_error.jsp /modify_success.jsp /modify_error.jsp /query_succ