java实现响应式布局爬虫技术

      package com.alioth.spider.servlet;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;

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

import com.alibaba.fastjson.JSONArray;
import com.alioth.spider.entity.Image;
import com.alioth.spider.util.SpiderUtil;

public class LoadImagesServlet extends HttpServlet {

	/**
	 * Constructor of the object.
	 */
	public LoadImagesServlet() {
		super();
	}

	/**
	 * Destruction of the servlet. <br>
	 */
	public void destroy() {
		super.destroy(); // Just puts "destroy" string in log
		// Put your code here
	}

	/**
	 * The doGet method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to get.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		
		doPost(request,response);
	}

	/**
	 * The doPost method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to post.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		//获取传入的页码和类型
		String pageNum = request.getParameter("pagenum");
		String category = request.getParameter("category");
		
		List<Image> images = SpiderUtil.queryImageList(category, pageNum);
		
		response.setContentType("text/html;charset=utf-8");
		//从response中获取输出流
		PrintWriter out = response.getWriter();
		//进行json字符串格式转换
		out.print(JSONArray.toJSONString(images,true));
		out.flush();
		out.close();

	}

	/**
	 * Initialization of the servlet. <br>
	 *
	 * @throws ServletException if an error occurs
	 */
	public void init() throws ServletException {
		// Put your code here
	}

}