Xamarin android 使用http协议上传字符串给服务器端

深藏阁楼爱情的钟 2022-05-29 03:44 166阅读 0赞

一.首先了解http协议  
[https://www.cnblogs.com/ranyonsue/p/5984001.html][https_www.cnblogs.com_ranyonsue_p_5984001.html]（推荐这篇文章）  
二.使用http协议上传  
public static string Upload(string urlPath, string content)  
\{  
string mContent = “”;  
try  
\{  
string BOUNDARY = “———7d4a6d158c9”; // 定义数据分隔线  
URL url = new URL(urlPath);  
HttpURLConnection conn = (HttpURLConnection)url.OpenConnection();  
// 发送POST请求必须设置如下两行  
conn.DoOutput = true;  
conn.DoInput = true;  
conn.UseCaches = false;  
conn.RequestMethod = “POST”;  
conn.SetRequestProperty(“connection”, “Keep-Alive”);  
conn.SetRequestProperty(“user-agent”, “Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)”);  
conn.SetRequestProperty(“Charsert”, “UTF-8”);  
conn.SetRequestProperty(“Content-Type”, “application/x-www-form-urlencoded; boundary=” + BOUNDARY);  
Java.IO.OutputStream os = new Java.IO.DataOutputStream(conn.OutputStream);  
Java.Lang.StringBuilder sb = new Java.Lang.StringBuilder();  
/*设置头参数*/  
sb.Append(“–”);  
sb.Append(BOUNDARY);  
sb.Append(“\\r\\n”);

/*填充内容*/
                sb.Append("Content-Disposition: form-data; name=\"userName\" \r\n\r\n");
                sb.Append(content);
                sb.Append("\r\n");
    
                /*设置尾参数*/
                sb.Append("\r\n--");
                sb.Append(BOUNDARY);
                sb.Append("--\r\n");
    
    
                byte[] data = Encoding.UTF8.GetBytes(sb.ToString());
                os.Write(data);
                os.Flush();
                os.Close();
    
                // 定义BufferedReader输入流来读取URL的响应
                Java.IO.BufferedReader reader = new Java.IO.BufferedReader(new Java.IO.InputStreamReader(conn.InputStream));
                string line = null;
                while ((line = reader.ReadLine()) != null)
                {
                    mContent += line;
                }   
                System.Console.WriteLine(mContent + "//");
                return mContent;
    
            }
            catch (Java.Lang.Exception e)
            {
    
                //System.out.println("发送POST请求出现异常！" + e);
                //e.printStackTrace();
            }
            return mContent;
        }

服务器端接收值的代码是：  
<%@page import=”com.jspsmart.upload.SmartUpload”%>  
<%@ page language=”java” contentType=”text/html; charset=UTF-8”  
pageEncoding=”UTF-8”%>  
<%  
SmartUpload su = new SmartUpload();  
//初始化组件上下文  
su.initialize(pageContext);  
//设置编码  
su.setCharset(“UTF-8”);  
try \{  
su.upload();  
\} catch (Exception e) \{

}
    String clientContent=su.getRequest().getParameter("userName");
    System.out.print("从android客户端传过来的用户名是："+clientContent);

这样就实现点击客户端的Button按钮之后，在java服务器端的控制台中救打印出了 admin字符串

三.使用http协议也能实现向服务器端上传  
private string UpLoadUserName(string serverUrl, string content)  
\{  
string mContent = “”;  
try  
\{  
URL url = new URL(serverUrl);  
HttpURLConnection conn = (HttpURLConnection)url.OpenConnection();  
// 发送POST请求必须设置如下两行  
conn.DoOutput = true;  
conn.DoInput = true;  
conn.UseCaches = false;  
conn.RequestMethod = “POST”;  
conn.SetRequestProperty(“connection”, “Keep-Alive”);  
conn.SetRequestProperty(“user-agent”, “Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)”);  
conn.SetRequestProperty(“Charsert”, “UTF-8”);  
//conn.SetRequestProperty(“Content-Type”, “application/x-www-form-urlencoded; boundary=” + BOUNDARY);  
Java.IO.OutputStream os = new Java.IO.DataOutputStream(conn.OutputStream);  
Java.Lang.StringBuilder sb = new Java.Lang.StringBuilder();  
sb.Append(“userName=” + content);  
byte\[\] data = Encoding.UTF8.GetBytes(sb.ToString());  
os.Write(data);  
os.Flush();  
os.Close();  
// 定义BufferedReader输入流来读取URL的响应  
Java.IO.BufferedReader reader = new Java.IO.BufferedReader(new Java.IO.InputStreamReader(conn.InputStream));  
string line = null;  
while ((line = reader.ReadLine()) != null)  
\{  
mContent += line;  
\}  
System.Console.WriteLine(mContent + “//”);  
return mContent;  
\}  
catch (Java.Lang.Exception e)  
\{  
System.Console.WriteLine(“发送POST请求出现异常！！！” + e);  
\}  
return mContent;

}

服务器端接收数据的代码：  
<%@page import=”com.jspsmart.upload.SmartUpload”%>  
<%@page import=”net.sf.json.JSONObject”%>  
<%@ page language=”java” contentType=”text/html;charset=UTF-8”  
pageEncoding=”UTF-8”%>

<%  
String getName = request.getParameter(“userName”);  
String clientContent = new String(getName.getBytes(“iso-8859-1”));//防止出现乱码  
System.out.print(clientContent);  
%>  
区别就在于，不使用http协议上传，服务器端用的是系统自带的request类来接收客户端的请求！  
如果使用http协议请求，服务器端用的是第三方的库 SmartUpLoad来接收客户端的传过来的数据！

[https_www.cnblogs.com_ranyonsue_p_5984001.html]: https://www.cnblogs.com/ranyonsue/p/5984001.html