每日总结

1.android的HttpURLConnection发送POST请求

核心代码：

PostUtils.java

public class PostUtils {
    public static String LOGIN_URL = "http://172.16.2.54:8080/HttpTest/ServletForPost";
    public static String LoginByPost(String number,String passwd)
    {
        String msg = "";
        try{
            HttpURLConnection conn = (HttpURLConnection) new URL(LOGIN_URL).openConnection();
            //设置请求方式,请求超时信息
            conn.setRequestMethod("POST");
            conn.setReadTimeout(5000);
            conn.setConnectTimeout(5000);
            //设置运行输入,输出:
            conn.setDoOutput(true);
            conn.setDoInput(true);
            //Post方式不能缓存,需手动设置为false
            conn.setUseCaches(false);
            //我们请求的数据:
            String data = "passwd="+ URLEncoder.encode(passwd, "UTF-8")+
                    "&number="+ URLEncoder.encode(number, "UTF-8");
            //这里可以写一些请求头的东东...
            //获取输出流
            OutputStream out = conn.getOutputStream();
            out.write(data.getBytes());
            out.flush();
             if (conn.getResponseCode() == 200) {  
                    // 获取响应的输入流对象  
                    InputStream is = conn.getInputStream();  
                    // 创建字节输出流对象  
                    ByteArrayOutputStream message = new ByteArrayOutputStream();  
                    // 定义读取的长度  
                    int len = 0;  
                    // 定义缓冲区  
                    byte buffer[] = new byte[1024];  
                    // 按照缓冲区的大小，循环读取  
                    while ((len = is.read(buffer)) != -1) {  
                        // 根据读取的长度写入到os对象中  
                        message.write(buffer, 0, len);  
                    }  
                    // 释放资源  
                    is.close();  
                    message.close();  
                    // 返回字符串  
                    msg = new String(message.toByteArray());  
                    return msg;
             }
        }catch(Exception e){e.printStackTrace();}
        return msg;
    }
}