【转-整理】Java 对外接口开发（http）服务端-客户端

java开发接口利用http协议传输数据

这个接口主要用来登录，java服务器提供一个接口，移动设备客户端（android和ios）能通过这个接口把用户名和密码之类的东东传过来到服务器验证，然后服务器返回数据告诉客户端是否登录成功。比如0是成功，1是失败。中间数据的传递都是通过http协议完成.这个接口该怎么写？

 

代码1.2为服务器接口，接收到客户端的信息解析验证，并返回需要的信息。

 

服务端代码：

 

public class TestTransfers extends HttpServlet {

    private static final long serialVersionUID = 1L;

    //HttpServletRequest 和 HttpServletResponse 用于接收请求和返回接口值
    //doGet用于接收get方法
    protected void doGet(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {

    }

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

        // 判断请求报文是否来自代维系统的ip地址
        String ip = request.getRemoteHost();
        // 获取收到的报文
        BufferedReader reader = request.getReader();
        
        String line = "";

        StringBuffer inputString = new StringBuffer();

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

            inputString.append(line);

        }
        // 如有必要，可以在报文中增加其他验证和加密的参数
        // 解析获取到的报文，根据ip地址、其他验证、加密等等来判断请求报文的服务器是否有权限
        // 如果请求验证合格，则根据请求的参数装配返回的报文
        // 要返回的报文
        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>长治县</county>");

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

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

        // ......

        // ......

        // ......

        // 循环组装响应的报文

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

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

        // 设置发送报文的格式

        response.setContentType("text/xml");

        response.setCharacterEncoding("UTF-8");

        PrintWriter out = response.getWriter();

        out.println(resultBuffer.toString());

        out.flush();

        out.close();

    }

}

客户端调用代码：

 

public void sendMessage() throws Exception {
    System.out.println("调用servlet开始=================");
    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();
        // 接报文的地址
        URL uploadServlet = new URL(
               "http://localhost:9090/TestTransfers");
        HttpURLConnection servletConnection = (HttpURLConnection) uploadServlet
               .openConnection();
        // 设置连接参数
        servletConnection.setRequestMethod("POST");
        servletConnection.setDoOutput(true);
        servletConnection.setDoInput(true);
        servletConnection.setAllowUserInteraction(true);
        // 开启流，写入XML数据
        OutputStream output = servletConnection.getOutputStream();
        System.out.println("发送的报文：");
        System.out.println(sendStr.toString());
        output.write(sendStr.toString().getBytes());
        output.flush();
        output.close();
        // 获取返回的数据
        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();
        }
    }
 }