Http 以post方式获取数据

来源：互联网发布：java web的书编辑：程序博客网时间：2024/05/29 15:47
import java.io.ByteArrayOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.io.UnsupportedEncodingException;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.URL;import java.net.URLEncoder;import java.util.HashMap;import java.util.Map;public class HttpUtils {    // 请求服务器端的url    private static String PATH = "http://192.168.0.102:8080/myhttp/servlet/LoginAction";    private static URL url;    public HttpUtils() {        // TODO Auto-generated constructor stub    }    static {        try {            url = new URL(PATH);        } catch (MalformedURLException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }    }    /**     * @param params     *            填写的url的参数     * @param encode     *            字节编码     * @return     */    public static String sendPostMessage(Map<String, String> params,            String encode) {        // 作为StringBuffer初始化的字符串        StringBuffer buffer = new StringBuffer();        try {            if (params != null && !params.isEmpty()) {                  for (Map.Entry<String, String> entry : params.entrySet()) {                        // 完成转码操作                        buffer.append(entry.getKey()).append("=").append(                                URLEncoder.encode(entry.getValue(), encode))                                .append("&");                    }                buffer.deleteCharAt(buffer.length() - 1);            }            // System.out.println(buffer.toString());            // 删除掉最有一个&                          System.out.println("-->>"+buffer.toString());            HttpURLConnection urlConnection = (HttpURLConnection) url                    .openConnection();            urlConnection.setConnectTimeout(3000);            urlConnection.setRequestMethod("POST");            urlConnection.setDoInput(true);// 表示从服务器获取数据            urlConnection.setDoOutput(true);// 表示向服务器写数据            // 获得上传信息的字节大小以及长度            byte[] mydata = buffer.toString().getBytes();            // 表示设置请求体的类型是文本类型            urlConnection.setRequestProperty("Content-Type",                    "application/x-www-form-urlencoded");            urlConnection.setRequestProperty("Content-Length",                    String.valueOf(mydata.length));            // 获得输出流,向服务器输出数据            OutputStream outputStream = urlConnection.getOutputStream();            outputStream.write(mydata,0,mydata.length);            outputStream.close();            // 获得服务器响应的结果和状态码            int responseCode = urlConnection.getResponseCode();            if (responseCode == 200) {                return changeInputStream(urlConnection.getInputStream(), encode);            }        } catch (UnsupportedEncodingException e) {            // TODO Auto-generated catch block            e.printStackTrace();        } catch (IOException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }        return "";    }    /**     * 将一个输入流转换成指定编码的字符串     *     * @param inputStream     * @param encode     * @return     */    private static String changeInputStream(InputStream inputStream,            String encode) {        // TODO Auto-generated method stub        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();        byte[] data = new byte[1024];        int len = 0;        String result = "";        if (inputStream != null) {            try {                while ((len = inputStream.read(data)) != -1) {                    outputStream.write(data, 0, len);                }                result = new String(outputStream.toByteArray(), encode);            } catch (IOException e) {                // TODO Auto-generated catch block                e.printStackTrace();            }        }        return result;    }    /**     * @param args     */    public static void main(String[] args) {        // TODO Auto-generated method stub        Map<String, String> params = new HashMap<String, String>();        params.put("username", "admin");        params.put("password", "1234");        String result = HttpUtils.sendPostMessage(params, "utf-8");        System.out.println("--result->>" + result);    }}
0 0