javaweb Servlet接收Android請求，並返回json數據

1.實現功能

(1)接收http請求

(2)獲取Android客戶端發送的參數對應的內容

(3)hibernate查詢數據庫

(4)返回json數據

2.java代碼

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 {
        // 設置響應內容類型
        response.setContentType("text/html;charset=utf-8");
        request.setCharacterEncoding("utf-8");
        response.setCharacterEncoding("utf-8");

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

            //獲得請求中傳來的用戶名和密碼
            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);


            //調用hibernate，根據用戶輸入查詢數據
            List<EntryFirminfoEntity> firminfolist= HibernateConnectUtil.queryBasicMessageByUserInput(companyname,realAddress,riskrank,firmtypeList);
            //采用“阿里巴巴”的json jar包下的JSONObject、JSONArray(該jar包的優勢是使得jsonObject1.put()方法放入的數據是有序排列的)
            //JSONobject按照put順序存儲和讀取
            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 {

    }
}