javaweb Servlet接收Android请求，并返回json数据

时间：2021-08-04 20:15:02

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 {

    }

}

相关文章