package com.helloBar;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import net.sf.json.JSONArray;
public class helloBar extends HttpServlet {
/**
* Constructor of the object.
*/
public helloBar() {
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 {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out
.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
out.println("<HTML>");
out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>");
out.println(" <BODY>");
out.print(" This is ");
out.print(this.getClass());
out.println(", using the GET method");
out.println(" </BODY>");
out.println("</HTML>");
out.flush();
out.close();
}
/**
* 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 {
//创建了一个bardao的对象，barDAO主要是对数据库的连接和对数据库的操作
barDAO bardao=new barDAO();
//调用bardao的select_all()方法把从数据库中读取所有的数据返回的是一个ArrayList，ArrayList里面放的是一个barBean
ArrayList<barBean> array = (ArrayList<barBean>) bardao.listAll();
System.out.println("s"+array);
//设置返回时的编码格式
response.setContentType("text/html; charset=utf-8");
//调用JSONArray.fromObject方法把array中的对象转化为JSON格式的数组
JSONArray json=JSONArray.fromObject(array);
System.out.println(json.toString());
//返回给前段页面
PrintWriter out = response.getWriter();
out.println(json);
out.flush();
out.close();
}
/**
* Initialization of the servlet. <br>
*
* @throws ServletException if an error occurs
*/
public void init() throws ServletException {
// Put your code here
}
}
echartdemo.zip （26个子文件） 
echartdemo .settings 
org.eclipse.jdt.core.prefs 330B src com helloBar barDAO.java 1KB barBean.java 367B helloBar.java 3KB .project 1KB WebRoot jquery.min.js 91KB jquery-1.8.2.min.js 91KB META-INF MANIFEST.MF 39B WEB-INF web.xml 638B classes com helloBar barBean.class 718B helloBar.class 2KB barDAO.class 2KB lib 
ezmorph-1.0.6.jar 84KB commons-collections-3.2.1.jar 562KB json-lib-0.9.jar 61KB commons-logging-1.1.1.jar 59KB commons-beanutils-1.8.0.jar 226KB javax.servlet.jar 96KB mysql-connector-java-5.1.15-bin.jar 768KB commons-lang-2.4.jar 256KB Copy of echart.jsp 4KB index.jsp 985B jquery-1.8.3.min.js 91KB echart.jsp 4KB .mymetadata 303B .classpath 1020B .myeclipse 
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