Android 开发。。。如何连接到服务器上的mysql数据库

1、首先输入代码

public void SendByHttpClient(final String id, final String pw){

new Thread(new Runnable() {

@Override

public void run() {

try {

HttpClient httpclient=new DefaultHttpClient()

HttpPost httpPost=new HttpPost("http://web应用部署服务器上的IP地址:/HttpClientDemo/Login")//服务器地址，指向Servlet

List<NameValuePair>params=new ArrayList<NameValuePair>()//将id和pw装入list

params.add(new BasicNameValuePair("ID",id))

params.add(new BasicNameValuePair("PW",pw))

final UrlEncodedFormEntity entity=new UrlEncodedFormEntity(params,"utf-8")//以UTF-8格式发送

httpPost.setEntity(entity)

HttpResponse httpResponse= httpclient.execute(httpPost)

if(httpResponse.getStatusLine().getStatusCode()==200)//在200毫秒之内接收到返回值

2、然后再输入下方的代码：

{

HttpEntity entity=httpResponse.getEntity()

String response=EntityUtils.toString(entity1, "utf-8")//以UTF-8格式解析

Message message=new Message()

message.what=USER_LOGIN

message.obj=response

handler.sendMessage(message)使用Message传递消息给线程

}

}

catch (Exception e) {

e.printStackTrace()

}

}

}).start()

  }

3、最终，测试结果图，如下：

android 通过 使用httpClient 与网站servlet通信

servlet 对mysql进行数据库 *** 作

也可以使用webservice *** 作mysql数据库

Android客户端直接连接远程MySQL数据库的方法如下：

String result = ""

//首先使用NameValuePair封装将要查询的年数和关键字绑定

ArrayList<NameValuePair>nameValuePairs = new ArrayList<NameValuePair>()

nameValuePairs.add(new BasicNameValuePair("year","1980"))

//使用HttpPost封装整个SQL语句

//使用HttpClient发送HttpPost对象

try{

HttpClient httpclient = new DefaultHttpClient()

HttpPost httppost = new HttpPost("http://example.com/getAllPeopleBornAfter.php")

httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs))

HttpResponse response = httpclient.execute(httppost)

HttpEntity entity = response.getEntity()

InputStream is = entity.getContent()

}catch(Exception e){

Log.e("log_tag", "Error in http connection "+e.toString())

}

//将HttpEntity转化为String

try{

BufferedReader reader = new BufferedReader(new InputStreamReader(is,"iso-8859-1"),8)

StringBuilder sb = new StringBuilder()

String line = null

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

sb.append(line + "\n")

}

is.close()

result=sb.toString()

}catch(Exception e){

Log.e("log_tag", "Error converting result "+e.toString())

}

//将String通过JSONArray解析成最终结果

try{

JSONArray jArray = new JSONArray(result)

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

JSONObject json_data = jArray.getJSONObject(i)

Log.i("log_tag","id: "+json_data.getInt("id")+

", name: "+json_data.getString("name")+

", sex: "+json_data.getInt("sex")+

", birthyear: "+json_data.getInt("birthyear")

)

}

}

}catch(JSONException e){

Log.e("log_tag", "Error parsing data "+e.toString())

}

虽然Android开发中可以直接连接数据库，但是实际中却不建议这么做，应该使用服务器端中转下完成。

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