我尝试编写一个简单的php文件,检查是否存在mysql值。
为此,我需要解析一个从json到android的简单字符串。
例如:当值存在时,字符串为" yes"当它不存在时,字符串是" no"。
与此同时,我尝试了许多"解决方案",但没有任何效果。
为此我经常使用它:
$abfrage = "
SELECT
Something
FROM
somewhere
WHERE
This=$that"
;
$link = mysql_query($abfrage) OR die("Error:"+mysql_error());
while($line = mysql_fetch_assoc($link)){
$new=$line;
}
print(json_encode($new));
并在Android中:
try
{
BufferedReader reader = new BufferedReader
(new InputStreamReader(is,"utf-8"),8);
StringBuilder sb = new StringBuilder();
while ((line = reader.readLine()) != null)
{
sb.append(line + "\n");
}
is.close();
result = sb.toString();
Log.e("pass 2", "connection success ");
}
catch(Exception e)
{
Log.e("Fail 2", e.toString());
}
try
{
System.out.println(result);
json_data = new JSONObject(result);
String name=(json_data.getString("something"));
Log.e("pass 3", "connection success ");
}
catch(Exception e)
{
Log.e("result:", result.toString());
}
}
这很有效,这是String" name"的值。是"某些东西"。
的价值但现在我的问题是:
是否可以在PHP中保存字符串并将其解析为android?
这就是我得到的:
$abfrage = "SELECT Something FROM somewhere WHERE This = '$that' LIMIT 1";
// Proof whether the value exists or not
$read = mysql_db_query($db, $abfrage);
if (mysql_num_rows($read) == 0){
$value="no";
}
else{
$value="yes";
};
print json_encode($value);
在JAVA中:
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("http://localhost/test.php");
HttpResponse response = httpclient.execute(httppost);
String str = EntityUtils.toString(response.getEntity());
System.out.println(""+str); //prints: yes
if(str=="yes") System.out.println("ok"); //not called
if(str=="no") System.out.println("nope"); //not called
答案 0 :(得分:1)
我不确定你是如何实现它的,但是我假设你用java代码执行PHP脚本:
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("http://localhost/sample/sample.php");
HttpResponse response = httpclient.execute(httppost);
然后简单地使用:
String str = EntityUtils.toString(response.getEntity());
使用
Log.d("Title", "Message");
在Logcat控制台中显示消息。
答案 1 :(得分:0)
我几个月前遇到过这个问题:
问题是,String str不仅包含单词“yes”。它还包含不同的字母/符号,这些字母/符号不会显示在Android / Eclipse中。所以你必须通过简单地调用substring(int start,int end)
来手动删除这些字母试试这个:
String str = EntityUtils.toString(response.getEntity());
int number= str.length();
System.out.println("str-length"+number); //You will see not the length of 3 (for yes)
String s2= str.substring(0, 3); //short the string
System.out.println("String s2"+s2);
if(s2.equals("yes"))Log.d("Titles", str);