app开发历程————Android程序解析服务器端的JSON格式数据，显示在界面上

上一篇文章写的是服务器端利用Servlet 返回JSON字符串，本文主要是利用android客户端访问服务器端链接，解析JSON格式数据，放到相应的位置上。

首先，android程序的布局文件main.xml

 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

     xmlns:tools="http://schemas.android.com/tools"

     android:layout_width="match_parent"

     android:layout_height="match_parent"

     android:paddingBottom="@dimen/activity_vertical_margin"

     android:paddingLeft="@dimen/activity_horizontal_margin"

     android:paddingRight="@dimen/activity_horizontal_margin"

     android:paddingTop="@dimen/activity_vertical_margin"

     tools:context=".MainActivity"

     android:orientation="vertical">

     <TextView

         android:id="@+id/textView"

         android:layout_width="wrap_content"

         android:layout_height="wrap_content"

         />

 </LinearLayout>

MainActivity.java

 package com.practice;

 import java.io.BufferedReader;

 import java.io.InputStreamReader;

 import org.apache.http.HttpEntity;

 import org.apache.http.HttpResponse;

 import org.apache.http.client.HttpClient;

 import org.apache.http.client.methods.HttpGet;

 import org.apache.http.impl.client.DefaultHttpClient;

 import org.apache.http.params.HttpConnectionParams;

 import org.apache.http.params.HttpParams;

 import org.json.JSONArray;

 import org.json.JSONObject;

 import android.os.Bundle;

 import android.app.Activity;

 import android.util.Log;

 import android.view.Menu;

 import android.widget.TextView;

 public class MainActivity extends Activity {

     @Override

     protected void onCreate(Bundle savedInstanceState) {

         super.onCreate(savedInstanceState);

         setContentView(R.layout.main);

         Log.v("111111111", "1111111111111111");

         try{

             StringBuffer sb=new StringBuffer();

             String url="http://192.168.0.251:8080/ServletTest/test";

             String body=getContent(url);

             Log.v("222222", body);

             JSONArray array=new JSONArray(body);

             //JSONObject ty=new JSONObject(body);

             for(int i=0;i<array.length();i++){

                 JSONObject obj=array.getJSONObject(i);

                 sb.append("id:").append(obj.getInt("id")).append("\t");

                 sb.append("name:").append(obj.getString("name")).append("\t");

                 sb.append("gender:").append(obj.getString("gender")).append("\t\n");

                 sb.append("email:").append(obj.getString("email")).append("\t");

                 sb.append("----------------------\n");

             }

             Log.v("333333333333", sb.toString());

             TextView textView =(TextView) findViewById(R.id.textView);

             textView.setText(sb.toString());

         }

         catch(Exception e)

         {

             Log.v("11111111111", e.toString());

             Log.v("11111111111", "msg");

         }

     }

     private String getContent(String url) throws Exception{

         StringBuilder sb=new StringBuilder();

         HttpClient client=new DefaultHttpClient();

         HttpParams httpParams=client.getParams();

         HttpConnectionParams.setConnectionTimeout(httpParams, 3000);

         HttpConnectionParams.setSoTimeout(httpParams, 5000);

         HttpResponse response =client.execute(new HttpGet(url));

         HttpEntity entity =response.getEntity();

         if(entity!=null){

             BufferedReader reader=new BufferedReader(new InputStreamReader(entity.getContent()));

             String line =null;

             while((line=reader.readLine())!= null){

                 sb.append(line+"\n");

             }

             reader.close();

         }

         return sb.toString();

     }

     @Override

     public boolean onCreateOptionsMenu(Menu menu) {

         // Inflate the menu; this adds items to the action bar if it is present.

         getMenuInflater().inflate(R.menu.main, menu);

         return true;

     }

 }

在AndroidManifest.xml，设定第一启动界面，开始运行

运行如下：

成功啦！一路上，无论多么坎坷，路还是要走，日子还需要照过！