servlet接收解析json数据
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servlet接收解析json数据
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一、jar包準備
jar: fastJson / gson
二、前端代碼
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Insert title here</title> </head> <body> <button id="btn">click</button> <script src="https://cdn.staticfile.org/jquery/2.1.1/jquery.min.js"></script><script type="text/javascript">$("#btn").click(function(){var list = {"list":[{name:'sf',age:'fs'}]};$.ajax({url:"log",type:'post',contentType: 'application/json',data: JSON.stringify(list),success:function(res){console.log(res);alert(res);}});})</script> </body> </html>三、工具類
package com.qst.until;import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader;import javax.servlet.ServletInputStream;import com.alibaba.fastjson.JSONArray; import com.alibaba.fastjson.JSONObject;public class JsonUtils {public static JSONArray getJson(InputStreamReader req) {JSONObject json = new JSONObject();JSONArray list = new JSONArray();BufferedReader br;String jsonStr = null;String jsonStr2 = null;try {br = new BufferedReader(req);String line = null;StringBuilder sb = new StringBuilder();while ((line = br.readLine()) != null) {sb.append(line);}json= JSONObject.parseObject(sb.toString());jsonStr = JSONObject.toJSONString(json);list = json.getJSONArray("list");jsonStr2 = JSONArray.toJSONString(list);} catch (IOException e) {e.printStackTrace();}return list;}}四、servlet代碼
package com.qst.servlet;import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader;import javax.servlet.ServletException; import javax.servlet.ServletInputStream; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse;import com.alibaba.fastjson.JSONArray; import com.alibaba.fastjson.JSONObject; import com.google.gson.JsonObject; import com.qst.until.JsonUtils;@WebServlet("/log") public class log extends HttpServlet {@Overrideprotected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {doGet(req, resp);}@Overrideprotected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {req.setCharacterEncoding("utf-8");resp.setCharacterEncoding("utf-8");resp.setContentType("text/html;charset=UTF-8");String name = null;InputStreamReader reader = new InputStreamReader((ServletInputStream) req.getInputStream());JSONArray list = JsonUtils.getJson(reader);System.out.println("list===============");System.out.println(list);System.out.println("逐個取出===============");for (int i = 0; i < list.size(); i++) {JSONObject object = (JSONObject) list.get(i);System.out.println("name" + object.getString("name") + "age" + object.getString("age"));name = object.getString("name");}resp.getWriter().write(name);}}總結
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