Android接收jsp中动态生成的xml或json数据。

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Android接收jsp中动态生成的xml或json数据。

2017年10月10日 ⁄ 综合 ⁄ 共 13240字 ⁄ 字号小中大 ⁄ 评论关闭

数据库：

Servlet端doPost（）方法：

protected void doPost(HttpServletRequest request,
   HttpServletResponse response) throws ServletException, IOException {
  request.setCharacterEncoding("utf-8");
  response.setCharacterEncoding("utf-8");
  // response.setContentType("text/xml;charset=utf-8");
  String format = request.getParameter("format");// 获取url传过来的数据
  ResultSet rs = userinfo.queryUserInfo("1=1");
  XmlJsonInter xmlJson = new XmlJsonImpl();
  if ("json".equals(format)) {
   xmlJson.JSON(rs, request, response);
  } else {
   xmlJson.XML(rs, request, response);
//   PrintWriter out=response.getWriter();
//   out.write("ceshi");
  }
 }

JSON方法和XML方法的实现：

package net.palm_on_campus.dao.interImpl;

import java.io.IOException;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.jstl.core.Config;

import net.palm_on_campus.dao.inter.XmlJsonInter;
import net.palm_on_campus.dao.model.UserInfo;

/**
 * <p>================MyEclipse===================
 * <p>将数据库中查询得到的数据转换为xml或者json格式[接口的实现]
 * <p>2013-7-22上午10:35:33
 * <p>============================================
 * @author YI
 */
public class XmlJsonImpl implements XmlJsonInter {
	@Override
	public void JSON(ResultSet rs, HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {
		// json格式： [{id:56,title:"xxxx",timelength:90}]
		StringBuilder builder = new StringBuilder();
		builder.append('[');
		try {
			if (rs != null)
				while (rs.next()) {
					builder.append('{');
					builder.append("username:")
							.append(rs.getString("username")).append(',');
					builder.append("userlogin:\"")
							.append(rs.getString("userlogin")).append("\",");
					builder.append("userpwd:\"")
					.append(rs.getString("userpwd")).append("\",");
					builder.append("flag:\"")
					.append(rs.getString("flag")).append("\",");
					builder.append("note:").append(rs.getString("note"));
					builder.append("},");
				}
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		builder.deleteCharAt(builder.length() - 1);
		builder.append(']');
		request.setAttribute("json",builder.toString());
		request.getRequestDispatcher("/json.jsp").forward(request, response);

	}

	@Override
	public void XML(ResultSet rs, HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {
		List<UserInfo> users = new ArrayList<UserInfo>();
		try {
			while (rs.next()) {
				UserInfo user = new UserInfo();
				user.setUserName(rs.getString("username"));
				user.setUserPwd(rs.getString("userpwd"));
				user.setUserLogin(rs.getString("userlogin"));
				user.setNote(rs.getString("note"));
				user.setFlag(Integer.parseInt(rs.getString("flag")));
				users.add(user);
			}
		} catch (NumberFormatException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		request.setAttribute("users", users);
		request.getRequestDispatcher("/xml.jsp").forward(request, response);
	}

}

json.jsp,和xml.jsp的实现：

json.jsp:

<%@ page language="java" contentType="text/plain; charset=UTF-8" pageEncoding="UTF-8"%>${json}

xml.jsp

<?xml version="1.0" encoding="utf-8"?>
<!--上面这句话必须为第一句，否则pull解析器报错 -->
<%@ page language="java" contentType="text/xml; charset=UTF-8" pageEncoding="UTF-8"%>
<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
	<userinfo>
	    <c:forEach items="${users}" var="user">
	        <user>
	            <username>${user.userName}</username>
	            <userlogin>${user.userLogin}</userlogin>
	            <note>${user.note}</note>
	            <userpwd>${user.userPwd}</userpwd>
	            <flag>${user.flag}</flag>
	        </user>
	    </c:forEach>
	</userinfo>

WEB端测试[test.jsp]：

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<form action="UserInfoServlet" method="post">
用户名：<input name="bookname"  type="text"/>
<p/>
<input type="submit" value="查询"/>
</form>
</body>
</html>

测试结果数据显示为：

---------------------------------------------------------------------------------------------------------------------------------------------------------------------

ANDROID端：

Tools工具类：[请根据需要改写，以下是解析json，和xml数据方法------仅供参考]

Tools.class:

package net.palm_on_campus.tools;

import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

import net.palm_on_campus.model.Info;
import net.palm_on_campus.model.UserInfo;

import org.json.JSONArray;
import org.json.JSONObject;
import org.xmlpull.v1.XmlPullParser;

import android.util.Xml;

public class Tools {

    public static byte[] read(InputStream inStream) throws Exception {
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
        byte[] buffer = new byte[1024];      
        while( (inStream.read(buffer)) !=-1){
            outputStream.write(buffer); 
        }
        inStream.close();
        return outputStream.toByteArray();
    }

    
/**
 * ------------------------------
 * <p>解析json数据
 * @param is 输入流
 * @return
 * @throws Exception
 * 2013-7-22
 * @-----------------------------
 */
    public static List<Info> parseJSON(InputStream is) throws Exception {
        List<Info> arruser = new ArrayList<Info>();
        byte[] data =Tools.read(is);
        //将字节数组转换成字符串
        String json= new String(data);
        //将json对象转换成json的数组对象
        JSONArray array = new JSONArray(json);
        for (int i = 0; i < array.length(); i++) {
            JSONObject jsonObject=array.getJSONObject(i);
            Info userInfo=new UserInfo(jsonObject);
//            userInfo.setUserName(jsonObject.getString("username"));
//            userInfo.setUserLogin(jsonObject.getString("userlogin"));
//            userInfo.setNote(jsonObject.getString("note"));
//            userInfo.setFlag(Integer.parseInt(jsonObject.getString("flag")));
//            userInfo.setUserPwd(jsonObject.getString("userpwd"));
            arruser.add(userInfo);
        }
        
        return arruser;
    }
/**
 * ------------------------------
 * <p>解析xml数据
 * @param is
 * @return
 * @throws Exception
 * 2013-7-22
 * @-----------------------------
 */
    public static List<Info> parseXML(InputStream is) throws Exception{
        List<Info> users=null;
        UserInfo user = null;
        //用Pull解析器解析XML文件
        XmlPullParser parser= Xml.newPullParser();
        parser.setInput(is, "UTF-8");  
        int event = parser.getEventType();
        //不等于结束事件，循环读取XML文件并封装成对象
        while(event !=XmlPullParser.END_DOCUMENT){
            switch (event) {
            case XmlPullParser.START_DOCUMENT:
            	users= new ArrayList<Info>();
            	break;
            case XmlPullParser.START_TAG:
                if("username".equals(parser.getName())){
                    user.setUserName(parser.nextText());
                }else if("userlogin".equals(parser.getName())){
                	user.setUserLogin(parser.nextText());
                }else if("userpwd".equals(parser.getName())){
                	user.setUserPwd(parser.nextText());
                }else if("note".equals(parser.getName())){
                	user.setNote(parser.nextText());
                }else if("flag".equals(parser.getName())){
                	user.setFlag(Integer.parseInt(parser.nextText()));
                }else if("user".equals(parser.getName())){
                    user=new UserInfo();
                }
                break;
            case XmlPullParser.END_TAG:
                if("user".equals(parser.getName())){
                    users.add(user);
                    user = null;
                }
                break;
            }
            event = parser.next();
        }
        
        return users;
    }
    
}

以上涉及的Info.class和UserInfo.class

package net.palm_on_campus.model;
/**
 * <p>=================Eclipse====================
 * <p>这个类名义上是所有信息的父类，但并没有储存信息。只是为了实现多态，从而达到统一接口命名
 * <p>之所以要统一命名是为了使得Tools类中parseJSON，parseXML等方法的通用性
 * <p>但是又不能直接去定义接口，因为接口的实现要实现接口中所有方法，但是时间使用中不一定全部需要
 * <p>2013-7-23下午12:46:35
 * <p>============================================
 * @author YI
 */
public abstract class Info {
   
//begin---------以下抽象方法为UserInfo实现的方法进行注册------------
	public abstract int getFlag();
	public abstract void setFlag(int flag);

	public abstract String getUserLogin();
	public abstract void setUserLogin(String userLogin);
	
	public abstract String getUserName();
	public abstract void setUserName(String userName);
	
	public abstract String getUserPwd();
	public abstract void setUserPwd(String userPwd);
	
	public abstract String getNote();
	public abstract void setNote(String note);
//end-------------------------------------------------------------   

    
    
    
    

}

package net.palm_on_campus.model;

import java.util.HashMap;

import org.json.JSONException;
import org.json.JSONObject;

/**
 * <p>=================Eclipse====================
 * <p>用户信息原型
 * <p>2013-7-21下午4:56:19
 * <p>============================================
 * @author YI
 */
public class UserInfo extends Info{
          private String userLogin;//用户登陆名
          private String userName;//用户名
          private String userPwd;//用户密码
          private String note;//用户备注信息
          private int flag;//标志
          
          public UserInfo(){}
          
          /**
           * @param userlogin 登陆名
           * @param username 用户名
           * @param userpwd 密码
           * @param note 备注
           * @param flag 标志
           */
          public UserInfo(String userlogin,String username,String userpwd,String note,int flag){ 
        	 this.userLogin=userlogin;
        	 this.userName=username;
        	 this.userPwd=userpwd;
        	 this.note=note;
        	 this.flag=flag;  
          }
          /**
           * 通过HashMap对用户进行初始化
           * @param map
           */
          public UserInfo(HashMap<String, Object> map){        	  
        	  this.userName=map.get("username").toString();
        	  this.userLogin=map.get("userlogin").toString();
        	  this.userPwd=map.get("userpwd").toString();
        	  this.note=map.get("note").toString();
        	  this.flag=Integer.parseInt(map.get("username").toString());
          }
          /**
           * 解析JSONObject数据对用户初始化
           * @param jsonObject 一组JSONArray对象中一个JSONObject
           * @throws JSONException
           */
          public UserInfo(JSONObject jsonObject) throws JSONException{
					this.userLogin = jsonObject.getString("userlogin");
					this.userName = jsonObject.getString("username");
					this.userPwd = jsonObject.getString("userpwd");
					this.note = jsonObject.getString("note");
					this.flag = Integer.parseInt(jsonObject.getString("flag"));

          }
          
		public String getUserLogin() {
			return userLogin;
		}
		public void setUserLogin(String userLogin) {
			this.userLogin = userLogin;
		}
		public String getUserName() {
			return userName;
		}
		public void setUserName(String userName) {
			this.userName = userName;
		}
		public String getUserPwd() {
			return userPwd;
		}
		public void setUserPwd(String userPwd) {
			this.userPwd = userPwd;
		}
		public String getNote() {
			return note;
		}
		public void setNote(String note) {
			this.note = note;
		}
		public int getFlag() {
			return flag;
		}
		public void setFlag(int flag) {
			this.flag = flag;
		}

}

[备注，使用者可以不要使用Info类，笔者我是由于一些需要，没有用Info类，只需要把Info-〉UserInfo]

向服务器接收信息的链接服务类：

package net.palm_on_campus.service;

import java.io.InputStream;
import java.io.StringReader;
import java.net.HttpURLConnection;
import java.net.URL;

import java.util.ArrayList;
import java.util.List;

import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;
import org.json.JSONArray;
import org.json.JSONObject;
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserFactory;

import android.util.Xml;

import net.palm_on_campus.config.ShlConfig;
import net.palm_on_campus.model.Info;
import net.palm_on_campus.model.UserInfo;
import net.palm_on_campus.tools.Tools;
/**
 * <p>=================Eclipse====================
 * <p>程序服务类
 * <p>JSON,XML数据加工
 * <p>2013-7-21下午4:58:10
 * <p>============================================
 * @author YI
 */
public class CampusService implements ShlConfig{

    
/**
 * ------------------------------
 * @param PATH 请求服务地址
 * @return
 * @throws Exception
 * 2013-7-22
 * @-----------------------------
 */
    public static List<Info> getHTTPData(String PATH) throws Exception{
        URL url = new URL(PATH);
		HttpURLConnection conn = (HttpURLConnection) url.openConnection();
		conn.setConnectTimeout(5000);
		conn.setDoInput(true);
		conn.setDoOutput(true);
		conn.setUseCaches(true);
		conn.setRequestMethod("GET");
		conn.setRequestProperty("Connection", "Keep-Alive");
		conn.setRequestProperty("Charset", "UTF-8");
		conn.setRequestProperty("Content-Type","application/x-www-form-urlencoded");
        if(conn.getResponseCode()==200){
            InputStream inStream=conn.getInputStream();
            if(PATH.indexOf("format=json")!=-1)
            	return Tools.parseJSON(inStream);
            else 
            	return Tools.parseXML(inStream);
        }
        return null;
    }
}

Activity：

package net.palm_on_campus.campus;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;

import net.palm_on_campus.config.ShlConfig;
import net.palm_on_campus.model.Info;
import net.palm_on_campus.model.UserInfo;
import net.palm_on_campus.service.CampusService;

import com.palm_on_campus.campus.R;

import android.app.Activity;
import android.os.Bundle;
import android.widget.ListView;
import android.widget.SimpleAdapter;
/**
 * <p>=================Eclipse====================
 * <p>MainActivity程序的入口
 * <p>2013-7-21下午4:52:29
 * <p>============================================
 * @author YI
 */
public class MainActivity extends Activity implements ShlConfig{
    /** Called when the activity is first created. */
	
	public static MainActivity app;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        app=this;
        ListView listView=(ListView)findViewById(R.id.listView1);
        try {
			List<Info> userinfo =CampusService.getHTTPData(SER_URL+"?format=json");
			//List<UserInfo> userinfo =CampusService.getJSONData();
			List<HashMap<String,Object>> data = new ArrayList<HashMap<String,Object>>();
			
			for(Info user:userinfo){
				HashMap<String, Object> map=new HashMap<String, Object>();
				map.put("username", user.getUserName());
				map.put("userlogin", user.getUserLogin());
				map.put("note", user.getNote());	
				map.put("pwd", "*********"/*user.getUserPwd()*/);	
				map.put("flag", user.getFlag());	
				data.add(map);
			}
			 SimpleAdapter adapter = new SimpleAdapter(this, data, R.layout.item, 
					 new String[]{"username","userlogin","note","pwd","flag"}, 
					 new int[]{R.id.tv1,R.id.tv2,R.id.tv3,R.id.tv4,R.id.tv5});
	 
			 listView.setAdapter(adapter);
		
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
       
        
    }
}

[SER_URL定义在接口中，可直接改为地址]

package net.palm_on_campus.config;
/**
 * <p>=================Eclipse====================
 * <p>配置文件定义为接口
 * <p>2013-7-21下午4:53:42
 * <p>============================================
 * @author YI
 */
public interface ShlConfig {
    /**
     * 服务器地址
     */
	final String SER_URL="http://192.168.1.44:8080/campus1_1/UserInfoServlet";

}

-------------运行-------------------

有问题可以e-mail我：yyii@live.cn

[初学，还请多多指教]

【上篇】Android中解析xml
【下篇】Advanced SystemCare激活

作者: surefire

该日志由 surefire 于7年前发表在综合分类下，最后更新于 2017年10月10日.
转载请注明: Android接收jsp中动态生成的xml或json数据。 | 学步园 +复制链接

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Android接收jsp中动态生成的xml或json数据。

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