如何从servlet来android应用传递数据 [英] how to pass data from servlet to android application
本文介绍了如何从servlet来android应用传递数据的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我在机器人在提交即时通讯使用的servlet我必须表明该表已成功插入用户插入到数据库中的表。这是我的应用程序
进口java.io.IOException异常;
进口javax.servlet.ServletException;
进口javax.servlet.http.HttpServlet的;
进口javax.servlet.http.HttpServletRequest;
进口javax.servlet.http.HttpServletResponse;
进口java.sql.Connection中;
进口java.lang.DriverManager中;
进口java.sql.Statement中;
进口的java.util.ArrayList;
/ **
*
* @author见习
* /
公共类的形式延伸的HttpServlet {
字符串名称;
字符串密码;
连接CON = NULL;
声明语句= NULL;
/ **
*流程为HTTP＆LT请求; code取代; GET＆LT; / code取代;和＆lt; code取代; POST＆LT; / code取代;的方法。
*参数要求servlet请求
* @参数响应servlet响应
* @throws了ServletException如果出现一个servlet特定的错误
* @throws IOException - 如果发生I / O错误
* /
/ * TODO输出你在这里页面
通过out.println（＆LT; HTML＆gt;中）;
通过out.println（＆LT; HEAD＆gt;中）;
通过out.println（＆LT;冠军＆GT; Servlet的形式LT; /标题＆gt;中）;
通过out.println（＆LT; /头＆GT;）;
通过out.println（＆LT;身体GT;）;
通过out.println（＆LT; H1＆GT;在Servlet的形式+ request.getContextPath（）+＆LT; / H1＆gt;中）;
通过out.println（＆LT; /身体GT;）;
通过out.println（＆LT; / HTML＆gt;中）;
* /
@覆盖
保护无效的doGet（HttpServletRequest的请求，HttpServletResponse的响应）
抛出了ServletException，IOException异常{
尝试
{
}
赶上（例外前）
{
}
}
/ **
*处理HTTP＆LT; code取代; POST＆LT; / code取代;方法。
*参数要求servlet请求
* @参数响应servlet响应
* @throws了ServletException如果出现一个servlet特定的错误
* @throws IOException - 如果发生I / O错误
* /
@覆盖
保护无效的doPost（HttpServletRequest的请求，HttpServletResponse的响应）
抛出了ServletException，IOException异常{
尝试
{
的Class.forName（com.mysql.jdbc.Driver）;
CON =的DriverManager.getConnection（JDBC：mysql的：//本地主机：3306 /登录，根，）;
字符串NN =的request.getParameter（姓名）;
字符串传递=的request.getParameter（通行证）;
字符串email =的request.getParameter（电子邮件）;
语句= con.createStatement（）;
字符串查询=插入到用户价值（'+ NN +，+通+，+电子邮件+'）;;
INT V = stmt.executeUpdate（查询）;
ArrayList的＆LT;字符串＆GT; ARR =新的ArrayList＆LT;字符串＆GT;（）;
arr.add（插入）;
的System.out.println（发回响应......）;
}
赶上（例外前）
{
}
}
/ **
*返回这个servlet的简短说明。
返回：包含的servlet描述的String
* /
@覆盖
公共字符串getServletInfo方法（）{
返回简短说明;
} //＆LT; /编辑倍＆GT;
}
这是我的Android应用程序
包org.me.loginandroid;
进口java.io.BufferedReader中;
进口的java.io.InputStream;
进口java.io.InputStreamReader中;
进口的java.util.ArrayList;
进口java.io. *;
进口org.apache.http.HttpEntity;
进口org.apache.http.Htt presponse;
进口org.apache.http.NameValuePair;
进口org.apache.http.client.HttpClient;
进口org.apache.http.client.entity.UrlEn codedFormEntity;
进口org.apache.http.client.methods.HttpPost;
进口org.apache.http.impl.client.DefaultHttpClient;
进口org.apache.http.message.BasicNameValuePair;
进口org.json.JSONArray;
进口org.json.JSONObject;
进口android.app.Activity;
进口android.content.Intent;
进口android.os.Bundle;
进口android.util.Log;
进口android.view.View;
进口android.view.View.OnClickListener;
进口android.widget.Button;
进口android.widget.EditText;
进口android.widget.TextView;
进口org.apache.http.client.methods.HttpGet;
公共类MainActivity延伸活动{
/ **第一次创建活动时调用。 * /
@覆盖
公共无效的onCreate（包savedInstanceState）{
super.onCreate（savedInstanceState）;
的setContentView（R.layout.main）;
按钮BTN1 =（按钮）findViewById（R.id.submit）;
btn1.setOnClickListener（listener_login）;
}
私人OnClickListener listener_login =新OnClickListener（）{
布尔查= FALSE;
公共无效的onClick（视图v）{
EditText上emailText =（EditText上）findViewById（R.id.email）;
EditText上passText =（EditText上）findViewById（R.id.password）;
EditText上nameText =（EditText上）findViewById（R.id.uname）;
字符串名称= nameText.getText（）的toString（）。
字符串email =（emailText.getText（）的toString（））;
字符串传递=（passText.getText（）的toString（））;
字符串结果=;
ArrayList的＆LT;的NameValuePair＆GT; namevaluepairs中=新的ArrayList＆LT;的NameValuePair＆GT;（）;
nameValuePairs.add（新BasicNameValuePair（姓名，名字））;
nameValuePairs.add（新BasicNameValuePair（通，通））;
nameValuePairs.add（新BasicNameValuePair（邮件，邮件））;
尝试 {
HttpClient的HttpClient的=新DefaultHttpClient（）;
HttpPost httppost =新HttpPost（http://10.0.2.2:8084/Login/form）;
httppost.setEntity（新UrlEn codedFormEntity（namevaluepairs中））;
HTT presponse响应= httpclient.execute（httppost）;
HttpEntity实体= response.getEntity（）;
InputStream的是= entity.getContent（）;
的BufferedReader读卡器=新的BufferedReader（新InputStreamReader的（就是，ISO-8859-1），8）;
StringBuilder的SB =新的StringBuilder（）;
串线= NULL;
而（（行= reader.readLine（））！= NULL）{
sb.append（行+\ N）;
}
is.close（）;
结果= sb.toString（）;
TextView的LBL =（TextView中）findViewById（R.id.lbl）;
lbl.setText（结果）;
}赶上（例外五）{
TextView的电视=（TextView中）findViewById（R.id.err）;
tv.setText（错误分析数据+ e.toString（））;
的System.out.println（错误分析数据+ e.toString（））;
}
//解析JSON数据
尝试 {
布尔查= FALSE;
ArrayList的＆LT;字符串＆GT;阵列=新的ArrayList＆LT;字符串＆GT;（）;
的for（int i = 0; I＆LT; arrays.size（）;我++）
{
如果（arrays.get（ⅰ）.equals（插入））
{
检查=真;
}
其他
{
}
}
如果（检查）
{
意图myintent =新的意图（MainActivity.this，welcome.class）;
startActivity（myintent）;
}
其他
{
TextView的电视=（TextView中）findViewById（R.id.err）;
tv.setText（数据不正确插入）;
}
}赶上（例外五）{
//setContentView(R.layout.notify）;
TextView的电视=（TextView中）findViewById（R.id.err）;
tv.setText（e.toString（））;
的System.out.println（log_tag+错误分析数据）;
}
}
};
}
解决方案
您可以在这里查询。有样本code整体描述
<一个href="http://stackoverflow.com/questions/8292815/send-arraylist-from-servlet-to-android-application">Send数组列表由servlet来Android应用程序
I have a form in android upon submit im inserting it into database using servlet i have to show to user that form was inserted successfully. this is my application
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.Statement;
import java.util.ArrayList;
/**
*
* @author trainee
*/
public class form extends HttpServlet {
String name;
String password;
Connection con = null;
Statement stmt = null;
/**
* Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
/* TODO output your page here
out.println("<html>");
out.println("<head>");
out.println("<title>Servlet form</title>");
out.println("</head>");
out.println("<body>");
out.println("<h1>Servlet form at " + request.getContextPath () + "</h1>");
out.println("</body>");
out.println("</html>");
*/
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
try
{
}
catch(Exception ex)
{
}
}
/**
* Handles the HTTP <code>POST</code> method.
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
try
{
Class.forName("com.mysql.jdbc.Driver");
con =DriverManager.getConnection ("jdbc:mysql://localhost:3306/Login","root", "");
String nn=request.getParameter("name");
String pass=request.getParameter("pass");
String email=request.getParameter("email");
stmt=con.createStatement();
String query="insert into users values('"+nn+"','"+pass+"','"+email+"');";
int v=stmt.executeUpdate(query);
ArrayList<String> arr=new ArrayList<String>();
arr.add("inserted");
System.out.println("sent response back...");
}
catch(Exception ex)
{
}
}
/**
* Returns a short description of the servlet.
* @return a String containing servlet description
*/
@Override
public String getServletInfo() {
return "Short description";
}// </editor-fold>
}
this is my android application
package org.me.loginandroid;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.io.*;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONArray;
import org.json.JSONObject;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import org.apache.http.client.methods.HttpGet;
public class MainActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button btn1 = (Button) findViewById(R.id.submit);
btn1.setOnClickListener(listener_login);
}
private OnClickListener listener_login = new OnClickListener() {
boolean check = false;
public void onClick(View v) {
EditText emailText = (EditText) findViewById(R.id.email);
EditText passText = (EditText) findViewById(R.id.password);
EditText nameText = (EditText) findViewById(R.id.uname);
String name = nameText.getText().toString();
String email = (emailText.getText().toString());
String pass = (passText.getText().toString());
String result = "";
ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
nameValuePairs.add(new BasicNameValuePair("name", name));
nameValuePairs.add(new BasicNameValuePair("pass", pass));
nameValuePairs.add(new BasicNameValuePair("email", email));
try {
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("http://10.0.2.2:8084/Login/form");
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
InputStream is = entity.getContent();
BufferedReader reader = new BufferedReader(new InputStreamReader(is, "iso-8859-1"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
is.close();
result = sb.toString();
TextView lbl = (TextView) findViewById(R.id.lbl);
lbl.setText(result);
} catch (Exception e) {
TextView tv = (TextView) findViewById(R.id.err);
tv.setText("Error parsing data " + e.toString());
System.out.println("Error parsing data " + e.toString());
}
//parse json data
try {
boolean check=false;
ArrayList<String> arrays=new ArrayList<String>();
for(int i=0;i<arrays.size();i++)
{
if(arrays.get(i).equals("Inserted"))
{
check=true;
}
else
{
}
}
if(check)
{
Intent myintent = new Intent(MainActivity.this, welcome.class);
startActivity(myintent);
}
else
{
TextView tv = (TextView) findViewById(R.id.err);
tv.setText("Data was not inserted properly");
}
} catch (Exception e) {
//setContentView(R.layout.notify);
TextView tv = (TextView) findViewById(R.id.err);
tv.setText(e.toString());
System.out.println("log_tag" + "Error parsing data ");
}
}
};
}
解决方案
You can check here. There is a whole description with sample code
Send arraylist from servlet to Android application
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