Android手机客户端通过JSP实现与Tomcat服务器端通信（Msql数据库，Json作为载体）

--服务端代码
服务器端主要代码：
1.首先构建一个Person类，用来保存用户信息
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public class Person  
    private String name; 
    private String address; 
    private Integer age; 
    public Person() { 
        super(); 
    } 
 
    public Person(String name, String address, Integer age) { 
        super(); 
        this.name = name; 
        this.address = address; 
        this.age = age; 
    } 
 
    public String getName() { 
        return name; 
    } 
 
    public void setName(String name) { 
        this.name = name; 
    } 
 
    public String getAddress() { 
        return address; 
    } 
 
    public void setAddress(String address) { 
        this.address = address; 
    } 
 
    public Integer getAge() { 
        return age; 
    } 
 
    public void setAge(Integer age) { 
        this.age = age; 
    } 
 
} 

2.服务器端的service类
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import java.io.PrintWriter; 
import java.sql.*; 
import java.util.*; 
        public class JsonService { 
    public static List<Person> getListPerson(){ 
         
        String a,b,allString = ""; 
        int c = 0; 
        List<Person> mLists = new ArrayList<Person>(); 
//      List<Person> mLists = new ArrayList<Person>(); 
//      mLists.add(new Person("临风", "北京", 20)); 
        System.out.println(mLists);  
        try { 
            Class.forName("com.mysql.jdbc.Driver");//链接数据库 
            Connection conn = DriverManager.getConnection( 
                    "jdbc:mysql://127.0.0.1:3306/json", "root" , "123456"); 
            Statement stmt = conn.createStatement(); 
            ResultSet rs = stmt.executeQuery("select * from people");//遍历数据库 
 
            Person p = null; 
             
            while(rs.next()) 
            { 
                 
                System.out.println(rs.getString(1) + "\t" 
                        + rs.getString(2) + "\t" 
                        + rs.getInt(3)); 
                a = rs.getString(1); 
                b = rs.getString(2); 
                c = rs.getInt(3); 
     
                mLists.add(new Person(a, b, c));//添加到List中 
            } 
            System.out.println(mLists);      
 
        }catch(Exception e){ 
            System.out.println(e); 
            e.printStackTrace(); 
            return mLists; 
        } 
//      finally{ 
//          return mLists; 
//      } 
        System.out.println(mLists);  
        return mLists; 
         
    } 
        //测试用主函数 
    public static void main(String[] args) throws Exception 
    { 
        String str[] = null; 
 
        JsonService con = new JsonService(); 
        List<Person> temp = con.getListPerson(); 
         
//      System.out.println(temp.); 
 
//      str = temp.split(" "); 
//      for(int i = 0 ; i < str.length ; i++){ 
//          System.out.println(str[i]); 
//      } 
//      System.out.println(str.length); 
    } 
 
} 

3.服务器端servlet类，接受android端的请求，并且将List中的Person数据转换为Json的格式，实现Json的数据传输
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import java.io.IOException; 
import java.io.PrintWriter; 
import java.util.List; 
import javax.servlet.ServletException; 
import javax.servlet.http.HttpServlet; 
import javax.servlet.http.HttpServletRequest; 
import javax.servlet.http.HttpServletResponse; 
import com.jiangqq.bean.Person; 
import com.jiangqq.csdn.JsonService; 
 
 
public class JsonServlet extends HttpServlet { 
    public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException{ 
        response.setContentType("text/html"); 
        response.setCharacterEncoding("UTF-8"); 
 
        try{ 
            PrintWriter out = response.getWriter(); 
            List<Person> persons = JsonService.getListPerson();//返回JsonService的数据      
 
            StringBuffer sb = new StringBuffer();//数据缓存 
            sb.append('['); 
 
            for (Person person : persons) {//person.getName(),person.getAddress()获得姓名，地址，一些符号转换为char 
                //锁定输出=> {"name":"姓名","address":"地址","age":年龄}, 
                sb.append('{').append("\"name\":").append("\""+person.getName()+"\"").append(","); 
                sb.append("\"address\":").append("\""+person.getAddress()+"\"").append(","); 
                sb.append("\"age\":").append(person.getAge()); 
                sb.append('}').append(","); 
            } 
            sb.deleteCharAt(sb.length() - 1); 
            sb.append(']'); 
            out.write(new String(sb)); 
            out.flush(); 
            out.close();//关闭 
        }catch(Exception e){ 
            System.out.println(e); 
            e.printStackTrace(); 
        } 
    } 
 
    public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 
        doGet(request, response); 
    } 
 
 
} 

环境搭建：
1.在Tomcat 7.0\webapps\JsonWeb\WEB-INF\lib  目录中加入了mysql-connector-java-5.0.8-bin.jar以及servlet-api.jar
2.然后在主目Tomcat 7.0\webapps\JsonWeb录的index.jsp中加入引用包的代码
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<%@ page import="java.util.*"%>   
<%@ page import="java.sql.*"%>    


结果测试：在浏览器输入http://localhost:8080/JsonWeb/JsonServlet，返回格式化好的json数据
--客户端代码
1.客户端文件，JsonParse，Json文件解析
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import java.io.ByteArrayOutputStream; 
import java.io.InputStream; 
import java.net.HttpURLConnection; 
import java.net.URL; 
import java.nio.charset.Charset; 
import java.util.ArrayList; 
import java.util.List; 
 
import org.json.JSONArray; 
import org.json.JSONObject; 
 
import com.jiangqq.bean.Person; 
 
public class JsonParse { 
    /**
     * 解析Json数据
     * 
     * @param urlPath
     * @return mlists
     * @throws Exception
     */ 
 
    public static List<Person> getListPerson(String urlPath) throws Exception { 
        List<Person> mlists = new ArrayList<Person>(); 
        byte[] data = readParse(urlPath); 
        JSONArray array = new JSONArray(new String(data)); 
        for (int i = 0; i < array.length(); i++) { 
            JSONObject item = array.getJSONObject(i); 
            String name = item.getString("name"); 
            String address = item.getString("address"); 
            int age = item.getInt("age"); 
            mlists.add(new Person(name, address, age)); 
        } 
        return mlists; 
    } 
 
    /**
     * 从指定的url中获取字节数组
     * 
     * @param urlPath
     * @return 字节数组
     * @throws Exception
     */ 
    public static byte[] readParse(String urlPath) throws Exception { 
        ByteArrayOutputStream outStream = new ByteArrayOutputStream(); 
        byte[] data = new byte[1024]; 
        int len = 0; 
        URL url = new URL(urlPath); 
        HttpURLConnection conn = (HttpURLConnection) url.openConnection(); 
        InputStream inStream = conn.getInputStream(); 
 
        while ((len = inStream.read(data)) != -1) { 
            outStream.write(data, 0, len); 
 
        } 
        inStream.close(); 
        return outStream.toByteArray(); 
 
    } 
} 

2.客户端主要类，MainActivity，发送请求

[java] view plaincopy
import java.util.ArrayList; 
import java.util.HashMap; 
import java.util.List; 
 
import com.jiangqq.bean.Person; 
import com.jiangqq.util.JsonParse; 
 
import android.app.Activity; 
import android.os.Bundle; 
import android.util.Log; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.widget.Button; 
import android.widget.ListView; 
import android.widget.SimpleAdapter; 
import android.widget.Toast; 
 
public class MainActivity extends Activity { 
    private Button mButton; 
    private ListView mListView; 
    private static final String urlPath = "http://192.168.1.100:8080/JsonWeb/JsonServlet"; 
    private static final String TAG = "MainActivity"; 
    private List<Person> persons; 
 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
        super.onCreate(savedInstanceState); 
        setContentView(R.layout.main); 
        mButton = (Button) findViewById(R.id.button1); 
        mListView = (ListView) findViewById(R.id.listView1); 
        mButton.setOnClickListener(new MyOnClickListener()); 
    } 
 
    private class MyOnClickListener implements OnClickListener { 
        @Override 
        public void onClick(View v) { 
            try { 
                // 得到Json解析成功之后数据 
                persons = JsonParse.getListPerson(urlPath); 
                List<HashMap<String, Object>> data = new ArrayList<HashMap<String, Object>>(); 
                for (int i = 0; i < persons.size(); i++) { 
                    HashMap<String, Object> map = new HashMap<String, Object>(); 
                    map.put("name", persons.get(i).getName()); 
                    map.put("address", persons.get(i).getAddress()); 
                    map.put("age", persons.get(i).getAge()); 
                    data.add(map); 
                } 
                SimpleAdapter _Adapter = new SimpleAdapter(MainActivity.this, 
                        data, R.layout.listview_item, new String[] { "name", 
                                "address", "age" }, new int[] { R.id.textView1, 
                                R.id.textView2, R.id.textView3 }); 
                mListView.setAdapter(_Adapter); 
            } catch (Exception e) { 
                Toast.makeText(MainActivity.this, "解析失败", 2000);//在手机上显示提示Toast，2秒 
                Log.i(TAG, e.toString());//DDMS中显示提示 
 
            } 
        } 
    } 
} 


3.同上一篇的，Person构造的数据类
[java] view plaincopy
package com.jiangqq.bean; 
 
public class Person { 
    private String name; 
    private String address; 
    private Integer age; 
 
    public Person() { 
        super(); 
    } 
 
    public Person(String name, String address, Integer age) { 
        super(); 
        this.name = name; 
        this.address = address; 
        this.age = age; 
    } 
 
    public String getName() { 
        return name; 
    } 
 
    public void setName(String name) { 
        this.name = name; 
    } 
 
    public String getAddress() { 
        return address; 
    } 
 
    public void setAddress(String address) { 
        this.address = address; 
    } 
 
    public Integer getAge() { 
        return age; 
    } 
 
    public void setAge(Integer age) { 
        this.age = age; 
    } 
 
    @Override 
    public String toString() { 
        return "Person [name=" + name + ", address=" + address + ", age=" + age 
                + "]"; 
    } 
     
     
 
} 


4.AndroidManifest.xml别忘记添加
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<uses-permission android:name="android.permission.INTERNET" /> 
[java] view plaincopy
<?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
    package="com.jiangqq.csdn" 
    android:versionCode="1" 
    android:versionName="1.0" > 
 
    <uses-sdk android:minSdkVersion="8" /> 
 
    <application 
        android:icon="@drawable/ic_launcher" 
        android:label="@string/app_name" > 
        <activity 
            android:name=".MainActivity" 
            android:label="@string/app_name" > 
            <intent-filter> 
                <action android:name="android.intent.action.MAIN" /> 
 
                <category android:name="android.intent.category.LAUNCHER" /> 
            </intent-filter> 
        </activity> 
    </application> 
 
    <uses-permission android:name="android.permission.INTERNET" /> 
 
</manifest>