src/cn/itcast/goods/book/web/servlet/BookServlet.java

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package cn.itcast.goods.book.web.servlet;

import java.io.IOException;

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

import cn.itcast.commons.CommonUtils;
import cn.itcast.goods.book.domain.Book;
import cn.itcast.goods.book.service.BookService;
import cn.itcast.goods.pager.PageBean;
import cn.itcast.servlet.BaseServlet;

public class BookServlet extends BaseServlet {
	private BookService bookService = new BookService();
	
	/**
	 * 获取当前页码
	 * @param req
	 * @return
	 */
	private int getPc(HttpServletRequest req) {
		int pc = 1;
		String param = req.getParameter("pc");
		if(param != null && !param.trim().isEmpty()) {
			try {
				pc = Integer.parseInt(param);
			} catch(RuntimeException e) {}
		}
		return pc;
	}
	
	/**
	 * 截取url，页面中的分页导航中需要使用它做为超链接的目标！
	 * @param req
	 * @return
	 */
	/*
	 * http://localhost:8080/goods/BookServlet?methed=findByCategory&cid=xxx&pc=3
	 * /goods/BookServlet + methed=findByCategory&cid=xxx&pc=3
	 */
	private String getUrl(HttpServletRequest req) {
		String url = req.getRequestURI() + "?" + req.getQueryString();
		/*
		 * 如果url中存在pc参数，截取掉，如果不存在那就不用截取。
		 */
		int index = url.lastIndexOf("&pc=");
		if(index != -1) {
			url = url.substring(0, index);
		}
		return url;
	}
	
	/**
	 * 按bid查询
	 * @param req
	 * @param resp
	 * @return
	 * @throws ServletException