servletbase.java

采用JAVA开发

/*
 * Created on 2004-8-4
 *
 * To change the template for this generated file go to
 * Window>Preferences>Java>Code Generation>Code and Comments
 */
package com.gctech.misc.base;

import java.io.IOException;
import java.util.Enumeration;

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

/**
 * <p>Title:</p>
 * <p>Description:</p>
 * <p>Copyright: Copyright (c) Gctech 2004-8-4</p>
 * <p>Company: 吉芙德资讯有限公司</p>
 *
 * @version 1.0
 * @author liyi
 *
 */
public abstract class ServletBase extends HttpServlet {
	public void doGet(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response)
		throws ServletException, IOException {
		performTask(request, response);
	}

	/**
	 * ***************************************************************************
	 * Process incoming HTTP Post requests
	 */
	public void doPost(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response)
		throws ServletException, IOException {
		performTask(request, response);
	}
	protected void forward(HttpServletRequest request, HttpServletResponse response, String dist)
		throws ServletException, java.io.IOException {
		getServletContext().getRequestDispatcher(dist).forward(request, response);
	}
	/**
		 * redirect request to another servlet or jsp
		 * 
		 * @param request 页面请求
		 * @param response 页面答复
		 * @param uri 重定向页面URI
		 * @param processParam 是否续传页面参数
		 * @throws IOException
		 * @throws ServletException
		 */
	public void redirect(HttpServletRequest request, HttpServletResponse response, String uri, boolean processParam)
		throws IOException, ServletException {
		StringBuffer buf = new StringBuffer();
		if (processParam) {
			boolean flag = false;
			buf.append(uri);
			if (uri.indexOf('?') < 0)
				buf.append("?");
			else
				flag = true;
			Enumeration paramEnu = request.getParameterNames();
			String name;
			String value;
			while (paramEnu.hasMoreElements()) {
				name = (String) paramEnu.nextElement();
				value = request.getParameter(name);
				if (flag)
					buf.append("&");
				else
					flag = true;
				buf.append(name);
				buf.append("=");
				buf.append(response.encodeURL(value));
			}
		}
		response.sendRedirect(response.encodeRedirectURL(buf.toString()));
	}
	public String getParam(ServletRequest request, String name) {
		return getParam(request, name, "");
	}

	public String getParam(ServletRequest request, String name, String defaultValue) {
		String value = request.getParameter(name);
		if (value == null || value.equals("")) {
			return defaultValue;
		} else {
			return value;
		}
	}

	public Integer getIntegerParam(ServletRequest request, String name) {
		String value = getParam(request, name);
		Integer result = new Integer(0);
		try {
			result = new Integer(value);
		} catch (Exception e) {
			//e.printStackTrace();
		}
		return result;
	}

	public Integer[] getIntegerParamValues(ServletRequest request, String name) {
		String[] values = request.getParameterValues(name);
		if (values != null) {
			Integer[] results = new Integer[values.length];
			for (int i = 0; i < values.length; i++) {
				Integer result = new Integer(0);
				try {
					result = new Integer(values[i]);
				} catch (Exception e) {
					//e.printStackTrace();
				}
				results[i] = result;
			}

			return results;
		} else {
			return new Integer[0];
		}
	}
	/**
	 * 需要子类实现这个方法实现业务逻辑
	 *
	 * @param request
	 * @param response
	 *
	 * @throws ServletException
	 */
	protected abstract void performTask(HttpServletRequest request, HttpServletResponse response)
		throws ServletException, java.io.IOException;

}