javaweb Servlet接收Android请求，并返回json数据

1.实现功能

(1)接收http请求

(2)获取Android客户端发送的参数对应的内容

(3)hibernate查询数据库

(4)返回json数据

2.java代码

import EntityClass.EntryFirminfoEntity;
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 java.io.IOException;
import java.io.PrintWriter;
import java.util.*;

@WebServlet(name = "BasicMessageServlet",urlPatterns = "/BasicMessageServlet")
public class BasicMessageServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // 设置响应内容类型
        response.setContentType("text/html;charset=utf-8");
        request.setCharacterEncoding("utf-8");
        response.setCharacterEncoding("utf-8");

        try (PrintWriter out = response.getWriter()) {

            //获得请求中传来的用户名和密码
            String companyname = request.getParameter("Companyname").trim();
            String realAddress = request.getParameter("RealAddress").trim();
            String riskrank = request.getParameter("Riskrank").trim();
            String firmtype=request.getParameter("firmtype").trim();
            ArrayList<String> firmtypeList=StringToArrayListUtil.stringToArrayList(firmtype);


            //调用hibernate，根据用户输入查询数据
            List<EntryFirminfoEntity> firminfolist= HibernateConnectUtil.queryBasicMessageByUserInput(companyname,realAddress,riskrank,firmtypeList);
            //采用“阿里巴巴”的json jar包下的JSONObject、JSONArray(该jar包的优势是使得jsonObject1.put()方法放入的数据是有序排列的)
            //JSONobject按照put顺序存储和读取
            com.alibaba.fastjson.JSONObject jsonObject=new com.alibaba.fastjson.JSONObject(true);
            com.alibaba.fastjson.JSONArray array = new com.alibaba.fastjson.JSONArray();
            int i=0;
            for (EntryFirminfoEntity entryFirminfoEntity : firminfolist) {
                com.alibaba.fastjson.JSONObject jsonObject1=new com.alibaba.fastjson.JSONObject(new LinkedHashMap<>());
                String firmName=entryFirminfoEntity.getFirmName();
                String address=entryFirminfoEntity.getAddress();
                String riskrankStr=entryFirminfoEntity.getRank();
                String region=entryFirminfoEntity.getRegion();
                String mgtypea=entryFirminfoEntity.getMgTypeA();
                String mgtypeb=entryFirminfoEntity.getMgTypeB();
                jsonObject1.put("firmname",firmName);
                jsonObject1.put("address",address);
                jsonObject1.put("riskrank",riskrankStr);
                jsonObject1.put("region",region);
                jsonObject1.put("mgtypea",mgtypea);
                jsonObject1.put("mgtypeb",mgtypeb);
                array.add(i,jsonObject1);
                i++;
            }
            jsonObject.put("params",array);
            out.write(jsonObject.toString());
        }
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

    }
}