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json前后臺(tái)傳值

談到JSON,簡單的說就是一種數(shù)據(jù)交換格式。近年來,其在服務(wù)器之間交換數(shù)據(jù)的應(yīng)用越來越廣,相比XML其格式更簡單、編解碼更容易、擴(kuò)展性更好,所以深受開發(fā)人員的喜愛。

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下面簡單的寫一下在項(xiàng)目中前后臺(tái)json傳值的一個(gè)小例子,供大家參考、查閱。

一:前臺(tái)傳后臺(tái)

1.前臺(tái)jsp頁面代碼:

 在index中將實(shí)體對象(自己創(chuàng)建即可)插入list中,再將list集合轉(zhuǎn)化成json數(shù)組,利用post方式發(fā)送AJAX請求,將這個(gè)json數(shù)組發(fā)送至后臺(tái)(servlet),再在后臺(tái)進(jìn)行解析即可。

index.jsp

<%@ page language="java" import="java.util.Date,com.badminton.utils.JsonDateValueProcessor,java.text.SimpleDateFormat,java.util.List,net.sf.json.JSONArray,net.sf.json.JSONObject,net.sf.json.JsonConfig,java.util.ArrayList,com.badminton.entity.Athlete,net.sf.json.JSONObject" pageEncoding="utf-8"%>



My first json page
<%
    SimpleDateFormat format1 = new SimpleDateFormat("yyyy-MM-dd");
    Athlete athlete1 = new Athlete();
    athlete1.setAthlete_id(1003);
    athlete1.setAthlete_name("林丹");
    athlete1.setAthlete_sex("男");
    Date athlete_age1 = format1.parse("1983-10-14");//是java.util.date
    athlete1.setAthlete_age(athlete_age1);
    athlete1.setCoach_id(101);
    athlete1.setEvent_id(1);
    athlete1.setService_status("1");
    athlete1.setExperience("2013年第12屆全運(yùn)會(huì)男單冠軍。");
    Athlete athlete2 = new Athlete();//記錄2
    athlete2.setAthlete_id(1004);
    athlete2.setAthlete_name("鮑春來");
    athlete2.setAthlete_sex("男");
    Date athlete_age2 = format1.parse("1988-10-14");
    athlete2.setAthlete_age(athlete_age2);
    athlete2.setCoach_id(101);
    athlete2.setEvent_id(1);
    athlete2.setService_status("1");
    athlete2.setExperience("2011年亞洲羽毛球錦標(biāo)賽亞軍。");
                                                                                                                                                              
    List list1 = new ArrayList();
    list1.add(athlete1);
    list1.add(athlete2);
    JsonConfig jsonConfig = new JsonConfig();//解決date類型的傳輸問題
    jsonConfig.registerJsonValueProcessor(Date.class , new JsonDateValueProcessor());
    JSONArray jsonarray = JSONArray.fromObject(list1, jsonConfig);
%>




2.后臺(tái)解析代碼:

 后臺(tái)接受前臺(tái)傳來的json對象,解析插入數(shù)據(jù)庫中,且反給前臺(tái)一個(gè)是否成功的消息。具體插入數(shù)據(jù)庫的代碼自己編寫一個(gè)即可。

JsonServlet.java

package com.badminton.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Date;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.badminton.app.AthleteAction;
import net.sf.json.JSONObject;
import net.sf.json.JSONArray;
public class JsonServlet extends HttpServlet {
    public JsonServlet() {
        super();
    }
    public void destroy() {
        super.destroy();
    }
    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        this.doPost(request, response);
    }
    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
                                                                                                                                                                            
        response.setContentType("text/xml");
        response.setHeader("Cache-Control", "no-cache");
        response.setCharacterEncoding("UTF-8");
        PrintWriter out = response.getWriter();
        AthleteAction athleteaction=new AthleteAction();
        try {
            String json1 = request.getParameter("athletehead");//接收athlete表的頭數(shù)據(jù)
            String json2 = request.getParameter("athlete");//接收athlete表數(shù)據(jù)
            json1 = java.net.URLDecoder.decode(json1,"UTF-8");
            json2 = java.net.URLDecoder.decode(json2, "UTF-8");
            if ((json1 != "") && (json2 != "")) {
                //System.out.println("json1:"+json1);
                JSONObject jsonObject1 =JSONObject.fromObject(json1);//生成json對象
                JSONArray jsonArray2 = JSONArray.fromObject(json2);//生成JSON數(shù)組
                for(int i=0;i");
                out.println("" + result + "");
                out.println("");
                out.close();
            } else{
                                                                                                                                                                                    
                String result = "傳輸過程出錯(cuò),請重傳!";
                out.println("");
                out.println("" + result + "");
                out.println("");
                out.close();
            }
        } catch (Exception e) {
            System.out
                    .println("JsonServlet doPost(HttpServletRequest request, HttpServletResponse response) 報(bào)錯(cuò):"
                            + e.getMessage());
        }
    }
    public void init() throws ServletException {
    }
                                                                                                                                                                        
                                                                                                                                                                        
}

3.解決傳遞日期的一個(gè)工具類

 若沒有這個(gè)工具類,date型數(shù)據(jù)會(huì)被轉(zhuǎn)化成json數(shù)組的格式,后臺(tái)解析起來會(huì)很復(fù)雜。

JsonDateValueProcessor.java

package com.badminton.utils;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;
import net.sf.json.JsonConfig;
import net.sf.json.processors.JsonValueProcessor;
public class JsonDateValueProcessor implements JsonValueProcessor{
     /**
     * datePattern
     */
    private String datePattern = "yyyy-MM-dd";
    /**
     * JsonDateValueProcessor
     */
    public JsonDateValueProcessor() {
        super();
    }
    /**
     * @param format
     */
    public JsonDateValueProcessor(String format) {
        super();
        this.datePattern = format;
    }
    /**
     * @param value
     * @param jsonConfig
     * @return Object
     */
    public Object processArrayValue(Object value, JsonConfig jsonConfig) {
        return process(value);
    }
    /**
     * @param key
     * @param value
     * @param jsonConfig
     * @return Object
     */
    public Object processObjectValue(String key, Object value,
            JsonConfig jsonConfig) {
        return process(value);
    }
    /**
     * process
     * @param value
     * @return
     */
    private Object process(Object value) {
        try {
            if (value instanceof Date) {
                SimpleDateFormat sdf = new SimpleDateFormat(datePattern,
                        Locale.UK);
                return sdf.format((Date) value);
            }
            return value == null ? "" : value.toString();
        } catch (Exception e) {
            return "";
        }
    }
    /**
     * @return the datePattern
     */
    public String getDatePattern() {
        return datePattern;
    }
    /**
     * @param pDatePattern the datePattern to set
     */
    public void setDatePattern(String pDatePattern) {
        datePattern = pDatePattern;
    }
}

二:后臺(tái)傳前臺(tái)

后臺(tái)以list和map兩種形式封裝json,前臺(tái)注意json數(shù)組和json對象解析時(shí)的差別即可。

1.TestJson.java

package com.badminton.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import net.sf.json.JSONArray;
import net.sf.json.JSONObject;
public class TestJson extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)  throws ServletException, IOException {
           doPost(request,response);
}
public void doPost(HttpServletRequest request, HttpServletResponse response)  throws ServletException, IOException {
  response.setContentType("text/html");
  String str= request.getParameter("name");//得到ajax傳遞過來的paramater
  System.out.println(str);
  PrintWriter out = response.getWriter();
  List list = new ArrayList();//傳遞List
                    //Map m=new HashMap();//傳遞Map
  User u1=new User();
  u1.setUsername("zah");
  u1.setPassword("123");
  User u2=new User();
  u2.setUsername("ztf");
  u2.setPassword("456");
        list.add(u1); //添加User對象  
        list.add(u2); //添加User對象
                    //m.put("u1", u1);
                    //m.put("u2", u2);
        JSONArray jsonArray2 = JSONArray.fromObject( list );//轉(zhuǎn)化成json對象
                    //JSONObject jo=JSONObject.fromObject(m);//轉(zhuǎn)化Map對象
        out.print(jsonArray2);//返給ajax請求
        System.out.println(jsonArray2);
                    //out.print(jo);//返給ajax請求
}
}

2.showjson.jsp

利用Jquery、AJAX異步傳輸?shù)姆绞浇邮芎笈_(tái)的發(fā)送請求。

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>


  


  
  
    

附件:http://down.51cto.com/data/2364170

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