echart从数据库获取数据展示final.zip

package com.gaea.control; import java.io.IOException; import java.util.List; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import com.fasterxml.jackson.databind.ObjectMapper; import com.gaea.bean.Bar; import com.gaea.service.BarDao; /** * Servlet implementation class TestServlet */ @WebServlet("/TestServlet") public class TestServlet extends HttpServlet { /** * */ private static final long serialVersionUID = 1L; @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { doPost(req,resp); } @Override protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { BarDao bar=new BarDao(); List<Bar> list = bar.getBarList(); // for(Bar b1:list){ // System.out.println(b1.getName()); // System.out.println(b1.getNum()); // } ObjectMapper mapper = new ObjectMapper(); //提供java-json相互转换功能的类 String json = mapper.writeValueAsString(list); //将list中的对象转换为Json格式的数组 System.out.println(list); System.out.println(json); //将json数据返回给客户端 response.setContentType("text/html; charset=utf-8"); response.getWriter().write(json); }}