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("	");
                sb.append("name:").append(obj.getString("name")).append("	");
                sb.append("gender:").append(obj.getString("gender")).append("	
");
                sb.append("email:").append(obj.getString("email")).append("	");
                sb.append("----------------------
");
            
            }
            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+"
");
            }
            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！