Android中使用HttpGet方式获取服务器端PHP Json返回数据

Admin

项目中为了节省用户通过3G网络访问系统内容的流量，决定采用Json的方式将服务器数据传递过来。而不是直接使用HTML的方式传输。
测试环境为：
XAMPP中的PHP + MYSQL+ Windows 7+Eclipse+本地网络


在IE中访问地址显示的JSon数据为：

1. {"title":"TTT","id":1,"value":"TTT"}

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1. <?php
   
2. header("Content-Type: text/html; charset=UTF-8");
   
3. $type = $_GET['type'];
   
4. if($type == 1)
   
5. {
   
6. //$obj->title = "Test";
   
7. //$obj->id = 1;
   
8. //$obj->value = urlencode("TTT");
   
9. //echo urldecode ( json_encode ($obj));
   
10. $array = array( 'title'=>'TTT', 'id'=>1, 'value'=>urlencode("哈哈"));
    
11. echo urldecode(json_encode($array));
    
12. }
    
13. ?>

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1. package com.jouhu;
   
2. 
   
3. import java.io.BufferedReader;
   
4. import java.io.InputStreamReader;
   
5. 
   
6. import org.apache.http.HttpResponse;
   
7. import org.apache.http.client.HttpClient;
   
8. import org.apache.http.client.methods.HttpGet;
   
9. import org.apache.http.impl.client.DefaultHttpClient;
   
10. import org.apache.http.util.EntityUtils;
    
11. import org.json.JSONException;
    
12. import org.json.JSONObject;
    
13. 
    
14. import android.app.Activity;
    
15. import android.os.Bundle;
    
16. import android.util.Log;
    
17. import android.view.View;
    
18. import android.widget.Button;
    
19. import android.widget.EditText;
    
20. 
    
21. public class PHPJsonActivity extends Activity {
    
22. /** Called when the activity is first created. */
    
23. 
    
24. private String Tag = "PHPJsonActivity";
    
25. @Override
    
26. public void onCreate(Bundle savedInstanceState)
    
27. {
    
28. super.onCreate(savedInstanceState);
    
29. setContentView(R.layout.main);
    
30. //EditText edit = (EditText)findViewById(R.id.editText1);
    
31. //String url = "http://88.88.88.200:8888/phpjson/index.php?type=1";
    
32. //getServerJsonDataWithNoType(url,edit);
    
33. Button btn = (Button)findViewById(R.id.button1);
    
34. btn.setOnClickListener(new View.OnClickListener() {
    
35. 
    
36. @Override
    
37. public void onClick(View v) {
    
38. // TODO Auto-generated method stub
    
39. EditText edit = (EditText)findViewById(R.id.editText1);
    
40. String url = "http://88.88.88.200:8888/phpjson/index.php?type=1";
    
41. getServerJsonDataWithNoType(url,edit);
    
42. }
    
43. });
    
44. }
    
45. public void getServerJsonDataWithNoType(String url,EditText editText)
    
46. {
    
47. int res = 0;
    
48. HttpClient client = new DefaultHttpClient();
    
49. StringBuilder str = new StringBuilder();
    
50. HttpGet httpGet = new HttpGet(url);
    
51. try
    
52. {
    
53. HttpResponse httpRes = client.execute(httpGet);
    
54. httpRes = client.execute(httpGet);
    
55. res = httpRes.getStatusLine().getStatusCode();
    
56. if(res == 200)
    
57. {
    
58. BufferedReader buffer = new BufferedReader(new InputStreamReader(httpRes.getEntity().getContent()));
    
59. for(String s = buffer.readLine(); s != null ; s = buffer.readLine())
    
60. {
    
61. str.append(s);
    
62. }
    
63. //String out = EntityUtils.toString(httpRes.getEntity().getContent(), "UTF-8");
    
64. //StringBuilder sb = new StringBuilder()
    
65. Log.i(Tag,str.toString());
    
66. try
    
67. {
    
68. //JSONObject json = new JSONObject(str.toString()).getJSONObject("content");
    
69. JSONObject json = new JSONObject(str.toString());
    
70. String title = json.getString("title");
    
71. Log.i(Tag,title);
    
72. int id = json.getInt("id");
    
73. String value = json.getString("value");
    
74. Log.i(Tag,value);
    
75. editText.setText("Title:" + title + " ID:" + id + " Value:" + value);
    
76. }
    
77. catch(JSONException e)
    
78. {
    
79. Log.i(Tag, e.getLocalizedMessage());
    
80. //buffer.close();
    
81. e.printStackTrace();
    
82. }
    
83. }
    
84. else
    
85. {
    
86. Log.i(Tag, "HttpGet Error");
    
87. }
    
88. }
    
89. catch(Exception e)
    
90. {
    
91. Log.i(Tag, "Exception");
    
92. }
    
93. }
    
94. 
    
95. }
    

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1 出现Value of type java.lang.String cannot be converted to JSONObject.这是由于我们的php或者其他服务器脚本有BOM头造成的。可以通过Editplus或者EmEditor或者UltraEditor进行删除。具体可以参考如何用去掉UTF-8的BOM头

编辑器调整为UTF8编码格式后，保存的文件前面会多出一串隐藏的字符（也即是BOM），用于编辑器识别这个文件是否是以UTF8编码。
运行Editplus，点击工具，选择首选项，选中文件，UTF-8标识选择 总是删除签名，
然后对PHP文件编辑和保存后的PHP文件就是不带BOM的了。
ultraedit去除bom头办法
打开文件后，另存为选项的编码格式里选择（utf-8 无bom头），确定就ok了

2 记得在AndroidManifest.XML中加入

< uses-permission android:name="android.permission.INTERNET" />

3 下面应该处理的问题是 中文以及根据数据库中的数据使用ListView或GroupView之类的生成UI。
主参考文章：
http://www.cnblogs.com/tt_mc/archive/2011/01/04/1925327.html
http://www.itxue.com/html/caozuoxitong/WINNT/20101123/7077.html
参考文章：
1 http://www.instropy.com/2010/06/ ... e-with-android-sdk/
2 http://www.josecgomez.com/2010/0 ... ervices-using-json/
3 http://www.cnblogs.com/tt_mc/archive/2011/01/04/1925327.html
4 http://blog.csdn.net/dadoneo/article/details/6233366
5 http://news.cnblogs.com/n/88356/
6 http://blog.lrenwang.com/post/114/