Android 通过GET和POST方式提交参数给web应用

时间：2014-08-13 10:40:45 阅读：221 评论：0 收藏：0 [点我收藏+]

如何把数据上传到web应用
应用界面：
视频名称：title
时长：timelength
保存，点击保存按钮提交到web应用中，web应用中开发Manageservlet来接收数据。
get方式
服务端：
public class ManageServlet extends HttpServlet
{
private static final long serialVersionUID = 1L;
protected void doGet(HttpServletRequest request,HttpServletResponse response) throws ServletException,IOExceptionprotected void doGet(HttpServletRequest request,HttpServletResponse response) throws ServletException,IOException
{
String title = request.getParameter("title");
title = new String(title.getBytes("ISO8859-1"),"UTF-8");
String timelength = request.getParameter("timelength");
System.out.println("视频名称："+title);
System.out.println("时长："+timelength);
}
protected void doPost(HttpServletRequest request,HttpServletResponse response) throws ServletException,IOException
{

}
}

Android端
public class MainActivity extends Activity
{
private EditText titleText;
private EditText lengthText;
public void onCreate(Bundle savedInstance)
{
super.onCreate(Bundle savedInstance);
setContentView(R.layout.main);
titleText =(EditText)this.findViewById(R.id.title);
lengthText =(EditText)this.findViewById(R.id.timelength);
Button saveButton=(Button) this.findViewById(R.id.button);
saveButton.setOnClickListener(new ButtonClickListener());
}
private static class ButtonClickListener implements View.OnClickListener
{
public void onClick(View v)
{
String title = titleText.getText().toString();
String length = lengthText.getText().toString();
boolean result = NewsService.save(title,length);
if(result)
{
Toast.makeText(getApplicationContext(),R.string.success,1).show();
}else{
Toast.makeText(getApplicationContext(),R.string.error,1).show();
}
}
}
}

/*保存数据*/
数据通过HTTP协议提交到网络上的web应用get post提交参数，对于2K以下的数据都可以，2K以上的必须使用post。使用get方法需要把参数把附加在路径上

public class NewsService
{
public static boolean save(String title,String length)
{
String path = "http://192.168.1.100:8080/web/ManageServlet";
Map<String,String> params = new HashMap<String,String>();
params.put(("title",title);
params.put("timelength",length);
try
{
return sendGETRequest(path,params,"UTF-8");
} catch(Exception e)
{
e.printStackTrace();
}
return false;
}
/*发送get请求*/
private static boolean sendGETRequest(String path,Map<String , String> params,String ecoding) throws Exception
{
//http://192.168.1.100:8080/web/ManageServlet?title=xxx&timelength=90
StringBuilder url=new StringBuilder(path);
url.append("?");
for(Map.Entry<String,String> entry:params.entrySet()) //迭代集合每一个元素
{
url.append(entry.getKey()).append("=");
url.append(URLEncoder.encode(entry.getValue(),ecoding));
url.append("&");
}
url.deleteCharAt(url.length()-1);
HttpURLConnection conn = (HttpURLConnection)new URL(url.toString()).openConnection();
conn.setConnectTimeout(5000);
conn.setRequestMethod("GET");
if(conn.getResponseCode() == 200)
{
return true;
}
return false;
}
}
提交中文的话产生乱码，产生乱码的原因：
1，在提交参数时，没有对中文参数进行URL编码
修改 url.append(entry.getValue);
2，Tomcat服务器默认采用的是ISO8859-1编码得到参数值
服务端添加 title = new String(title.getBytes("ISO8859-1"),"UTF-8");

如果很多参数，转换很麻烦，可以采用过滤器,不用进行转码了
新建filter：EncodingFilter
对所有路径进行过滤，可以修改URL Pattern /Servlet Name为 /*
public class EncodingFilter implements Filter
{
public void destroy() {}
public void doFilter(ServletRequest request,ServletResponse response,FilterChain chain)throws IOException //每次请求到来的时候会调用该方法
{
HttpServletRequest req=(HttpServletRequest) request;
if("GET".equals(req.getMethod()))
{
EncodingHttpServletRequest wrapper = new EncodingHttpServletRequest(req);
chain.doFilter(wrapper,response);
} else {
req.setCharacterEncoding("UTF-8");
chain.doFilter(request, response);
}


}
public void init(FilterConfig fConfig) thhrows ServletException{}

}
新建类 EncodingHttpServletRequest
public class EncodingHttpServletRequest extends HttpServletRequestWrapper
{
private HttpServletRequest request;
public EncodingHttpServletRequest(HttpServletRequest request)
{
super(request);
this.request=request;
}
//勾选重写getParameter方法 @Override
public String getParameter(String name)
{
String value = request.getParameter(name);
if(value !=null)
{
try{
value = new String(value.getBytes("ISO8859-1"),"UTF-8");
} catch (UnsupportedEncodingException e)
{}
}
return value;
}
}

POST方式
Http协议介绍
POST /web/ManageServlet HTTP/1.1 方式/路径/版本
Accept 可接收的数据类型
Referer http://192.168.1.100:8080/web/index.jsp 来源路径
Accept-Language
User-Agent 那个厂商浏览器
Content-Type:用于指定提取数据的内容类型 application/x-www-form-urlencoded
Accept-Encoding:
Host:192.168.1.100；8080
Content-Length：用于指定提取数据的总长度26
Connection：Keep-Alive

title=liming&timelength=90 提取数据

服务端：
public class ManageServlet extends HttpServlet
{
private static final long serialVersionUID = 1L;
protected void doGet(HttpServletRequest request,HttpServletResponse response) throws ServletException,IOExceptionprotected void doGet(HttpServletRequest request,HttpServletResponse response) throws ServletException,IOException
{
String title = request.getParameter("title");
//title = new String(title.getBytes("ISO8859-1"),"UTF-8");
String timelength = request.getParameter("timelength");
System.out.println("视频名称："+title);
System.out.println("时长："+timelength);
}
protected void doPost(HttpServletRequest request,HttpServletResponse response) throws ServletException,IOException
{

}
}

Android端
public class MainActivity extends Activity
{
private EditText titleText;
private EditText lengthText;
public void onCreate(Bundle savedInstance)
{
super.onCreate(Bundle savedInstance);
setContentView(R.layout.main);
titleText =(EditText)this.findViewById(R.id.title);
lengthText =(EditText)this.findViewById(R.id.timelength);
Button saveButton=(Button) this.findViewById(R.id.button);
saveButton.setOnClickListener(new ButtonClickListener());
}
private static class ButtonClickListener implements View.OnClickListener
{
public void onClick(View v)
{
String title = titleText.getText().toString();
String length = lengthText.getText().toString();
boolean result = NewsService.save(title,length);
if(result)
{
Toast.makeText(getApplicationContext(),R.string.success,1).show();
}else{
Toast.makeText(getApplicationContext(),R.string.error,1).show();
}
}
}
}

/*保存数据*/
数据通过HTTP协议提交到网络上的web应用get post提交参数，对于2K以下的数据都可以，2K以上的必须使用post。使用get方法需要把参数把附加在路径上

public class NewsService
{
public static boolean save(String title,String length)
{
String path = "http://192.168.1.100:8080/web/ManageServlet";
Map<String,String> params = new HashMap<String,String>();
params.put(("title",title);
params.put("timelength",length);
try
{
return sendPOSTRequest(path,params,"UTF-8");
} catch(Exception e)
{
e.printStackTrace();
}
return false;
}
/*发送POST请求*/
private static boolean sendPOSTRequest(String path,Map<String , String> params,String ecoding) throws Exception
{
// title=liming&timelength=90
StringBuilder data=new StringBuilder();
if(params!=null && !params.isEmpty())
{
for(Map.Entry<String,String>entry:params.entrySet()) //迭代集合每一个元素
{
data.append(entry.getKey()).append("=");
data.append(URLEncoder.encode(entry.getValue(),ecoding));
data.append(entry.getKey()).append("&");
}
data.deleteCharAt(data.length() - 1);
}
byte[] entity = data.toString().getBytes(); //默认采用UTF-8得到字节数据
HttpURLConnection conn=(HttpURLConnection) new URL(path).openConnection();
conn.setConnectTimeout(5000);
conn.setRequestMethod("POST");
conn.setDoOutput(true); //允许对外输出数据
conn.setRequestProperty("Content-Type","application/x-www-form-urlencoded");
conn.setRequestProperty("Content-Length",String.valueOf(entity.length));
OutputStream outStream = conn.getOutputStream();
outStream.write(entity); //数据并没有写入web应用，只是输出到缓存，只有获得响应码后才输出到web应用
if(conn.getResponseCode() ==200)
{
return true;
}

return false;
}

Android HttpClient框架
可以完成浏览器完成的功能
public class NewsService
{
public static boolean save(String title,String length)
{
String path = "http://192.168.1.100:8080/web/ManageServlet";
Map<String,String> params = new HashMap<String,String>();
params.put(("title",title);
params.put("timelength",length);
try
{
return sendHttpClientPOSTRequest(path,params,"UTF-8");
} catch(Exception e)
{
e.printStackTrace();
}
return false;
}
/*发送POST请求*/
private static boolean sendHttpClientPOSTRequest(String path,Map<String , String> params,String ecoding) throws Exception
{
List<NameValuePair> pairs = new ArrayList<NameValuePair>(); //存放请求参数
if(params !=null && !=params.isEmpty())
{
for(Map.Entry<String,String> entry : params.entrySet())
{
pairs.add(new BasicNameValuePair(entry.getKey(),entry.getValue()));

}
}
// title=liming&timelength=90
UrlEncodingFormEntity entity = new UrlEncodingFormEntity(pairs,encoding);
HttpPost httpPost=new HttpPost(path);
httpPost.setEntity(entity);
DefaultHttpClient client = new DefaultHttpClient();
client.execute(httpPost);
HttpResponse response = client.execute(httpPost);
if( response.getStatusLine().getStatusCode() ==200)
{
return true;
}
return false;
}

Android 通过GET和POST方式提交参数给web应用,布布扣,bubuko.com

标签：des android style http 使用 os io 数据

原文地址：http://blog.csdn.net/yueyuehu001/article/details/38524801

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