package com.example.helloworld;public class MainActivity extends ActionBarActivity {    private String responseMsg = "";        @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);                    Button button1 = (Button)findViewById(R.id.button1);        button1.setOnClickListener(new OnClickListener() {                        @Override            public void onClick(View arg0) {                                Thread loginThread = new Thread(new LoginThread());                loginThread.start();            }        });            }    
　　//发送请求的主要方法    private boolean loginServer(){        boolean loginValidate = false;        
　　　　　//servlet服务器地址是        String urlStr = "http://192.168.1.24:8080/servletTest/test";        HttpPost request = new HttpPost(urlStr);                try {            HttpClient client = getHttpClient();            //执行请求            HttpResponse response = client.execute(request);
　　　　　　　 //response是servlet给出的返回结果            if(response.getStatusLine().getStatusCode() == 200){                loginValidate = true;                responseMsg = EntityUtils.toString(response.getEntity());            }        } catch (Exception e) {            // TODO: handle exception            e.printStackTrace();        }        return loginValidate;    }        public HttpClient getHttpClient(){        BasicHttpParams httpParams = new BasicHttpParams();        HttpConnectionParams.setConnectionTimeout(httpParams, 5*1000);        HttpConnectionParams.setSoTimeout(httpParams, 10*1000);        HttpClient client = new DefaultHttpClient(httpParams);        return client;    }        class LoginThread implements Runnable{        public void run(){    　　　　　　boolean loginValidate = loginServer();  　　　　　　System.out.println("======================bool is :"+loginValidate+"----------------response: "+responseMsg);        }    }}

package cn.dragon.servlet;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;import java.io.PrintWriter;import java.sql.DriverManager;import java.sql.ResultSet;import java.sql.SQLException;import java.sql.Statement;import java.util.ArrayList;import javax.servlet.ServletException;import javax.servlet.ServletInputStream;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;import com.sun.corba.se.pept.transport.Connection;public class ServletDemoFirst extends HttpServlet{    public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException{//        response.setContentType("text/html; charset=GB2312");//        PrintWriter outPrintWriter = response.getWriter();//        outPrintWriter.println("hello");//        outPrintWriter.close();        //Connection conn = null;
　　　　　//首先建立数据库连接        String driver = "com.mysql.jdbc.Driver";        String url = "jdbc:mysql://localhost:3306/test";        String user = "root";        String password = "admin";        PrintWriter out = response.getWriter();        //out.println("welcom");        try {            Class.forName(driver);            java.sql.Connection conn = DriverManager.getConnection(url, user, password);            //out.println("loading success");            Statement statement = conn.createStatement();
　　　　　　　//进行数据库查询。            ResultSet rs = statement.executeQuery("select * from career");            ArrayList<String> list1 = new ArrayList<String>();            while(rs.next()){                //out.println(rs.getString(1));                list1.add(rs.getString(1));            }
　　　　　　　//out用来向客户端返回数据。如果用网页访问这个网址，查询数据库的结果就显示在网页上，如果用android访问，就返回给android手机            out.println(list1.toString());            rs.close();            statement.close();            conn.close();        } catch (ClassNotFoundException cnfex) {            //System.err.println("装载 JDBC/ODBC 驱动程序失败。");            out.println("loading JDBC failed");            cnfex.printStackTrace();            System.exit(1); // terminate program        } catch (SQLException sqlex) {            //System.err.println("无法连接数据库");            out.println("can not connect to the database");            sqlex.printStackTrace();            System.exit(1); // terminate program        }            }        public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException{
　　　　 doGet(request, response);        }}

package com.example.helloworld;public class MainActivity extends ActionBarActivity {    private String responseMsg = "";        @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);                    Button button1 = (Button)findViewById(R.id.button1);        button1.setOnClickListener(new OnClickListener() {                        @Override            public void onClick(View arg0) {                // TODO Auto-generated method stub                //Intent intent = new Intent(MainActivity.this, InfoActivity.class);                //startActivity(intent);                Thread loginThread = new Thread(new LoginThread());                loginThread.start();            }        });            }       public HttpClient getHttpClient(){        BasicHttpParams httpParams = new BasicHttpParams();        HttpConnectionParams.setConnectionTimeout(httpParams, 5*1000);        HttpConnectionParams.setSoTimeout(httpParams, 10*1000);        HttpClient client = new DefaultHttpClient(httpParams);        return client;    }        private void sendJson(){        //boolean loginValidate = false;        String urlStr = "http://192.168.1.24:8080/servletTest/test";        HttpPost post = new HttpPost(urlStr);        try{            //向服务器写json            JSONObject json1 = new JSONObject();            //Object email = null;            Object email = "hlelo";            json1.put("email", email);            //Object pwd = null;            Object pwd = "wodls";            json1.put("password", pwd);                        System.out.println("=============="+json.toString());            //保证json数据不是乱码            StringEntity se = new StringEntity(json.toString());            se.setContentEncoding(new BasicHeader(HTTP.CONTENT_TYPE, "application/json"));            post.setEntity(se);                        //发送json给服务器            HttpClient httpClient = getHttpClient();            HttpResponse httpResponse = httpClient.execute(post);                        /*int httpCode = httpResponse.getStatusLine().getStatusCode();            if(httpCode == HttpURLConnection.HTTP_OK && httpResponse != null){                //org.apache.http.Header[] headers = httpResponse.getAllHeaders();                HttpEntity entity = httpResponse.getEntity();                //org.apache.http.Header header = httpResponse.getFirstHeader("content-type");                //读取服务器返回的json                InputStream inputStream = entity.getContent();                InputStreamReader inputStreamReader = new InputStreamReader(inputStream);                BufferedReader reader = new BufferedReader(inputStreamReader);                String s;                while((s= reader.readLine())!= null){                    result.append(s);                }                reader.close();                                JSONObject jsonObject = new JSONObject(result.toString());                String nameString = jsonObject.getString("email");                String passString = jsonObject.getString("password");                System.out.println("===============email is: "+nameString+", password is: "+passString);*/        }catch(Exception exception){            exception.printStackTrace();        }    }        class LoginThread implements Runnable{        public void run(){                       sendJson();        }    }     }

package cn.dragon.servlet;public class ServletDemoFirst 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{        //处理json内容        response.setCharacterEncoding("UTF-8");        response.setContentType("text/json");        String acceptjson = "";        try {            BufferedReader br = new BufferedReader(new InputStreamReader((ServletInputStream)request.getInputStream(), "utf-8"));            StringBuffer sb = new StringBuffer("");            String temp;            while((temp = br.readLine()) != null){                sb.append(temp);            }            br.close();                     
　　　　　　  //以上的过程都从request中读取json，并将json转换成string，这样可以显示出来。最终String类型的json就是acceptjson　　            acceptjson = sb.toString();            System.out.println("=======json is==========="+acceptjson);            if(acceptjson != ""){                //System.out.println("get the json successfully");                JSONObject jo = JSONObject.fromObject(acceptjson);
　　　　　　　　　　//email即是android端发送过来的json当中的一个key，我们使用get方法读取对应的value                System.out.println(jo.get("email"));            }            else{                System.out.println("get the json failed");            }        } catch (Exception e) {            // TODO: handle exception            e.printStackTrace();        }    }}

/**** android: sendJson()      *****/private void sendJson(){        //boolean loginValidate = false;        StringBuilder result = new StringBuilder();        String urlStr = "http://192.168.1.24:8080/servletTest/test";        HttpPost post = new HttpPost(urlStr);        List<NameValuePair> params = new ArrayList<NameValuePair>();        //params.add(new BasicNameValuePair("name", "this is post"));        try{            //向服务器写json            JSONObject json1 = new JSONObject();            //Object email = null;            Object email = "hlelo";            json1.put("email", email);            //Object pwd = null;            Object pwd = "wodls";            json1.put("password", pwd);                        JSONArray jsonArray = new JSONArray();
　　　　　　　 //生成一个JSONARRAY并将上面的json装入其中            jsonArray.put(0, json1);            JSONObject json = new JSONObject();
　　　　　　　 //再生成一个JSONObject，将刚才的JSONArray放入其中，再发送到服务器端　            json.put("dao", jsonArray);            System.out.println("=============="+json.toString());                        //保证json数据不是乱码            StringEntity se = new StringEntity(json.toString());            se.setContentEncoding(new BasicHeader(HTTP.CONTENT_TYPE, "application/json"));            post.setEntity(se);                        //发送json给服务器            HttpClient httpClient = getHttpClient();            HttpResponse httpResponse = httpClient.execute(post);                                }catch(Exception exception){            exception.printStackTrace();        }    

/***** servlet: doPost()  *****/public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException{//处理json内容        System.out.println("=======json is===========");        response.setCharacterEncoding("UTF-8");        response.setContentType("text/json");        String acceptjson = "";        try {            BufferedReader br = new BufferedReader(new InputStreamReader((ServletInputStream)request.getInputStream(), "utf-8"));            StringBuffer sb = new StringBuffer("");            String temp;            while((temp = br.readLine()) != null){                sb.append(temp);            }            br.close();            acceptjson = sb.toString();            System.out.println("=======json is==========="+acceptjson);            if(acceptjson != ""){                //System.out.println("get the json successfully");
　　　　　　　　　　//先获取json
                JSONObject jo = JSONObject.fromObject(acceptjson);                //再获取json中包含的jsonarry，dao是刚才android端给出的key                JSONArray ja = jo.getJSONArray("dao");
　　　　　　　　　　//循环获取jsonarray中的每个json                for(int i = 0; i < ja.size(); i++){                    JSONObject object = JSONObject.fromObject(ja.get(i));
　　　　　　　　　　　　 //获取json中的email值，email是json中的key
                    System.out.println("email is: "+object.get("email"));                }            }            else{                System.out.println("get the json failed");            }        } catch (Exception e) {            // TODO: handle exception            e.printStackTrace();        }    }