封装servlet详解

package com.neusoft.avnc.util;


import java.io.IOException;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.text.SimpleDateFormat;
import java.util.Date;


import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;


import com.neusoft.avnc.dataccess.DBException;
import com.neusoft.avnc.pojo.logManageMent.LogManageMent;
import com.neusoft.avnc.pojo.login.AuthLogin;
import com.neusoft.avnc.services.logManageMent.LogManageMentServiceImpl;
/**
 * <h1>通过模板设计模式实现通用类</h1>
 * <p>凡是需要登陆认证的<code>Servlet</code>都可以继承这个<code>Action</code>
 * <br/>如果请求有响应页面，只需要调用内部类<code>Mapping</code>里的<code>findFoward(url)</code>
 * 这个方法即可,子类只需要对execute()方法实现即可
 * </p>
 * <p>
 * 通过JAVA反射技术对HttpServlet进行简单封装，类似于struts框架，<br/>
 * 页面请求过来的参数名只需要与Action<T> T这个Bean里的变量对应即可,<br/>
 * getForm()就是获得页面传过来的参数[注：当前这个只能传T里的string和int/Integer类型的，<br/>
 * 如果需要更多的类型，请修改这个类]
 *</p>
 * @param T 可以是一个用来接受页面请求的Bean
 * @author <a href="mailto:hou.zhy@neusoft.com">侯振宇</a>
 *
 */
@SuppressWarnings("all")
public abstract class Action<T> extends HttpServlet {
/**
* 子类必需实现这个方法，处理相关的业务
* @param request
* @param response
* @param mapping
*/
public abstract void execute(HttpServletRequest request,
HttpServletResponse response, Mapping mapping);
/**
 * <h1>内部调用类，实现页面跳转功能</h1>
 * 
 * @author <a href="mailto:hou.zhy@neusoft.com">侯振宇</a>
 *
 */
public class Mapping {
HttpServletRequest request;
HttpServletResponse response;


/**
* 构造器
* @param request
* @param response
*/
public Mapping(HttpServletRequest request, HttpServletResponse response) {
this.request = request;
this.response = response;
}


/**
* 页面跳转方法
* @param uri 需要跳转的地址,可以传递带参数的URL
*/
public void findFoward(String uri) {
try {
request.getRequestDispatcher(uri).forward(request, response);
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* <h1>通过反射获取<code>Bean</code>对象属性值</h1>
* <p>该方法将取得form 或 url 对应Bean 的参数值</p>
* @return Object form bean 实类对象
* @author <a href="mailto:hou.zhy@neusoft.com">侯振宇</a>
*/
public T getForm() throws Exception{
Object object = null; //返回的form bean 实类对象
Object param=null; //接受为bean参数赋值的对象
Class<T> clazz = getClazz(); //获取将要操作的bean实类
try {
object = clazz.newInstance();
} catch (Exception e) {
throw new RuntimeException("Class instance is invalid");
}
Field[] fields = clazz.getDeclaredFields();
if(fields.length > 0){
for(Field field:fields){
param = request.getParameter(field.getName().trim());
if(!"".equals(param) && param!=null){
param = param.toString().trim();
String methodName = "set"+field.getName().substring(0, 1).toUpperCase()+field.getName().substring(1);
try {
Method method = clazz.getDeclaredMethod(methodName, field.getType());
if("Integer".equals(field.getType().getSimpleName())||"int".equals(field.getType().getSimpleName()))
param = Integer.parseInt(param.toString());
method.invoke(object, param);
} catch (Exception e) {
throw new NoSuchMethodException("method name not found:"+methodName+"\n"+e.getMessage());
}
}
}
}
return (T) object;
}
}
/**
* 反射获取父类泛型第一个参数
* @return Class
*/
public Class<T> getClazz(){
Class<T> clazz = null;
Type type = getClass().getGenericSuperclass();
if(type instanceof ParameterizedType){
Type[] params = ((ParameterizedType) type).getActualTypeArguments(); 
if(params.length>0 && params[0] instanceof Class){
clazz = (Class<T>)params[0];
}else {
throw new RuntimeException("Class is null!!");
}
}
return clazz;
}


public AuthLogin al = null;
protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
// 防止IE缓存
response.setHeader("Pragma", "No-cache");
response.setHeader("Cache-Control", "no-cache");
response.setDateHeader("Expires", 0);
response.setCharacterEncoding("UTF-8");
al = (AuthLogin) request.getSession(true).getAttribute("authLogin");
Mapping mapping = new Mapping(request, response);
if (al != null && al.getCode() == 0) {// al =null session 超时
try {
setLog(al);//写日志
execute(request, response, mapping);
} catch (Exception e) {
String error = "系统忙请稍后再试";
if (e.getMessage().equals("终端操作失败")) {
error = "终端超时,请稍后再试!";
}
request.setAttribute("errorInfo", error);
mapping.findFoward("excepitonPage.jsp");//通知用户的信息
e.printStackTrace();
}
} else {// session超时
request.setAttribute("errorInfo", "-1");
mapping.findFoward("excepitonPage.jsp");
}
}


protected void doGet(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
doPost(request, response);
}
/**
* 添加日志
* @param al AuthLogin
*/
public void setLog(AuthLogin al){
//入库:日志   
LogManageMentServiceImpl logmanagementserviceimpl = new LogManageMentServiceImpl();
LogManageMent logmanagement = new LogManageMent();
SimpleDateFormat format = new SimpleDateFormat("yyyyMMddHHmmss");
Long nowTime = DateTimeFormatter.parseTime(format.format(new Date()));
//sim卡号
logmanagement.setSim(al.getLogin_name());
//用户角色(暂无)
logmanagement.setUserRole(" ");
//当前时间
logmanagement.setOperateTime(nowTime);
//操作行为
logmanagement.setOperateAction(setActionName());
try {
logmanagementserviceimpl.setRule(logmanagement);
} catch (DBException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}
/**
* 根据类名取得正在操作的栏目
* @param content 写入日志的内容
*/
private String setActionName(){
String currentClazzName = getClass().getSimpleName();
if("PositionTrailinnQueryServlet".equals(currentClazzName)){
return "位置跟踪-查询";
}
if("PositionTrailinnServlet".equals(currentClazzName)){
return "位置跟踪-用户进行周期设置定位";
}
if("PositionTrailinnUpdateUIServlet".equals(currentClazzName)){
return "位置跟踪-更新界面";
}
if("PositionTrailinnUpdateServlet".equals(currentClazzName)){
return "位置跟踪-更新数据";
}
if("PositionTrailinnDelServlet".equals(currentClazzName)){
return "位置跟踪-删除数据";
}
if("TerminalCountServlet".equals(currentClazzName)){
return "后台管理-统计相关数据报表";
}
if("TerminalCountUIServlet".equals(currentClazzName)){
return "后台管理-统计报表界面";
}
if("PositionCountServlet".equals(currentClazzName)){
return "定位记录统计";
}
if("SmsStatsCountServlet".equals(currentClazzName)){
return "短信记录统计";
}
return currentClazzName;
}
}