【轉-整理】Java 對外接口開發（http）服務端-客戶端

java開發接口利用http協議傳輸數據

這個接口主要用來登錄，java服務器提供一個接口，移動設備客戶端（android和ios）能通過這個接口把用戶名和密碼之類的東東傳過來到服務器驗證，然后服務器返回數據告訴客戶端是否登錄成功。比如0是成功，1是失敗。中間數據的傳遞都是通過http協議完成.這個接口該怎么寫？

 

代碼1.2為服務器接口，接收到客戶端的信息解析驗證，並返回需要的信息。

 

服務端代碼：

 

public class TestTransfers extends HttpServlet {

    private static final long serialVersionUID = 1L;

    //HttpServletRequest 和 HttpServletResponse 用於接收請求和返回接口值
    //doGet用於接收get方法
    protected void doGet(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {

    }

    //doPost用於接收post方法
    protected void doPost(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {

        // 判斷請求報文是否來自代維系統的ip地址
        String ip = request.getRemoteHost();
        // 獲取收到的報文
        BufferedReader reader = request.getReader();
        
        String line = "";

        StringBuffer inputString = new StringBuffer();

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

            inputString.append(line);

        }
        // 如有必要，可以在報文中增加其他驗證和加密的參數
        // 解析獲取到的報文，根據ip地址、其他驗證、加密等等來判斷請求報文的服務器是否有權限
        // 如果請求驗證合格，則根據請求的參數裝配返回的報文
        // 要返回的報文
        StringBuffer resultBuffer = new StringBuffer();

        resultBuffer.append("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");

        resultBuffer.append("<report_data>");

        resultBuffer.append("<respon_req>953947334</respon_req>");

        resultBuffer.append("<respon_time>20120402113943</respon_time>");

        resultBuffer.append("<result>");

        resultBuffer.append("<id>0000</id>");

        resultBuffer.append("<comment>成功</comment>");

        resultBuffer.append("</result>");

        resultBuffer.append("<items>");

        resultBuffer.append("<item>");

        resultBuffer.append("<county>長治縣</county>");

        resultBuffer.append("<company>鐵通</company>");

        resultBuffer.append("<speciality>線路</speciality>");

        resultBuffer.append("<personnel>王加和</personnel>");

        resultBuffer.append("<begin_time>20120301000000</begin_time>");

        resultBuffer.append("<end_time>20120331235959</end_time>");

        resultBuffer.append("<plan_quantity>50</plan_quantity>");

        resultBuffer.append("<checkout_quantity>40</checkout_quantity>");

        resultBuffer.append("<patrol_rate>0.80</patrol_rate>");

        resultBuffer.append("</item>");

        // ......

        // ......

        // ......

        // 循環組裝響應的報文

        resultBuffer.append("</items>");

        resultBuffer.append("</report_data>");

        // 設置發送報文的格式

        response.setContentType("text/xml");

        response.setCharacterEncoding("UTF-8");

        PrintWriter out = response.getWriter();

        out.println(resultBuffer.toString());

        out.flush();

        out.close();

    }

}

客戶端調用代碼：

 

public void sendMessage() throws Exception {
    System.out.println("調用servlet開始=================");
    StringBuffer sendStr = new StringBuffer();
    sendStr.append("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
    sendStr.append("<report_data>");
    sendStr.append("<request_req>953943547334</request_req>");
    sendStr.append("<request_time>2012040211394324</request_time>");
    sendStr.append("<request_param>");
    sendStr.append("<query_month>201203</query_month>");
    sendStr.append("</request_param>");
    sendStr.append("</report_data>");
    BufferedReader reader = null;
    try {
        String strMessage = "";
        StringBuffer buffer = new StringBuffer();
        // 接報文的地址
        URL uploadServlet = new URL(
               "http://localhost:9090/TestTransfers");
        HttpURLConnection servletConnection = (HttpURLConnection) uploadServlet
               .openConnection();
        // 設置連接參數
        servletConnection.setRequestMethod("POST");
        servletConnection.setDoOutput(true);
        servletConnection.setDoInput(true);
        servletConnection.setAllowUserInteraction(true);
        // 開啟流，寫入XML數據
        OutputStream output = servletConnection.getOutputStream();
        System.out.println("發送的報文：");
        System.out.println(sendStr.toString());
        output.write(sendStr.toString().getBytes());
        output.flush();
        output.close();
        // 獲取返回的數據
        InputStream inputStream = servletConnection.getInputStream();
        reader = new BufferedReader(new InputStreamReader(inputStream));
        while ((strMessage = reader.readLine()) != null) {
           buffer.append(strMessage);
        }
        System.out.println("接收返回值:" + buffer);
    } catch (java.net.ConnectException e) {
        throw new Exception();
    } finally {
        if (reader != null) {
           reader.close();
        }
    }
 }