java 实现http协议发送接收数据

来源：互联网发布：linux shell 睡眠编辑：程序博客网时间：2024/05/14 03:35

java模拟 post/get方式发送数据 main方法中用的是post

import java.io.*;import java.net.HttpURLConnection;import java.net.URL;import java.net.URLEncoder;public class httpurl {    private static final String TAG = "netUtils";    /**     * 使用post方式登陆     *     * @param username     * @param password     * @return     */    public static void main(String []args){        httpurl test=new httpurl();        test.loginOfPost("niha","qwer1234");    }    public static String loginOfPost(String username, String password) {        HttpURLConnection conn = null;        try {            // 创建一个URL对象            URL mURL = new URL("http://localhost:12001");            // 调用URL的openConnection()方法,获取HttpURLConnection对象            conn = (HttpURLConnection) mURL.openConnection();            conn.setRequestMethod("POST");// 设置请求方法为post           /* conn.setReadTimeout(5000);// 设置读取超时为5秒            conn.setConnectTimeout(10000);// 设置连接网络超时为10秒*/            conn.setDoOutput(true);// 设置此方法,允许向服务器输出内容            int len=0;            String path="E:\\private_project\\github_project\\nsar\\test.txt";            // post请求的参数            byte[] buf= new byte[10240];            FileInputStream fis=new FileInputStream(path);            while((len = fis.read(buf)) != -1){                System.out.print(len);            }//            String data = "username=" + username + "&password=" + password;            // 获得一个输出流,向服务器写数据,默认情况下,系统不允许向服务器输出内容            OutputStream out = conn.getOutputStream();// 获得一个输出流,向服务器写数据//            out.write(data.getBytes());            out.write(buf);            out.flush();            out.close();            int responseCode = conn.getResponseCode();// 调用此方法就不必再使用conn.connect()方法            if (responseCode == 200) {                InputStream is = conn.getInputStream();                String state = getStringFromInputStream(is);                return state;            } else {//                Log.i(TAG, "访问失败" + responseCode);                System.out.print("访问失败");            }        } catch (Exception e) {            e.printStackTrace();        } finally {            if (conn != null) {                conn.disconnect();// 关闭连接            }        }        return null;    }    /**     * 使用get方式登陆     *     * @param username     * @param password     * @return     */    public static String loginOfGet(String username, String password) {        HttpURLConnection conn = null;        String data = "username=" + URLEncoder.encode(username) + "&password="+ URLEncoder.encode(password);        String url = "http://192.168.0.100:8080/android/servlet/LoginServlet?"+ data;        try {            // 利用string url构建URL对象            URL mURL = new URL(url);            conn = (HttpURLConnection) mURL.openConnection();            conn.setRequestMethod("GET");            conn.setReadTimeout(5000);            conn.setConnectTimeout(10000);            int responseCode = conn.getResponseCode();            if (responseCode == 200) {                InputStream is = conn.getInputStream();                String state = getStringFromInputStream(is);                return state;            } else {//                Log.i(TAG, "访问失败" + responseCode);                System.out.print("访问失败");            }        } catch (Exception e) {            e.printStackTrace();        } finally {            if (conn != null) {                conn.disconnect();            }        }        return null;    }    /**     * 根据流返回一个字符串信息         *     * @param is     * @return     * @throws IOException     */    private static String getStringFromInputStream(InputStream is)            throws IOException {        ByteArrayOutputStream os = new ByteArrayOutputStream();        // 模板代码 必须熟练        byte[] buffer = new byte[1024];        int len = -1;        // 一定要写len=is.read(buffer)        // 如果while((is.read(buffer))!=-1)则无法将数据写入buffer中        while ((len = is.read(buffer)) != -1) {            os.write(buffer, 0, len);        }        is.close();        String state = os.toString();// 把流中的数据转换成字符串,采用的编码是utf-8(模拟器默认编码)        os.close();        return state;    }}

java 模拟服务器端接收post/get数据实现时不需要向客户端返回数据，只需要接受客户端发过来的数据所以response 注释掉了

import java.io.BufferedReader;import java.io.InputStreamReader;import java.net.ServerSocket;import java.net.Socket;/** * Created by lpeiz on 2016/9/26. */public class Server {    public static void main(String[] args) {        try {            ServerSocket serverSocket = new ServerSocket(12001);//            System.out.println("HTTP Server (only POST implemented) is ready and is listening on Port Number 12001 \n");            while(true) {                Socket clientSocket = serverSocket.accept();//                System.out.println(clientSocket.getInetAddress().toString() + " " + clientSocket.getPort());                BufferedReader in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));//                OutputStream out = clientSocket.getOutputStream();                String temp;                int i=1001;                while((temp=in.readLine()) != null)                    System.out.println(temp+i++);//                String response = "HTTP/1.1 200 OK\n\r";//                response = response + "Date: Fri, 04 May 2001 20:08:11 GMT\n\r";//                response = response + "Server: Sanjits Server\n\r";//                response = response + "Connection: close\n\r";//                response = response + "1";//                byte[] bytes = response.getBytes();//                byte[]bytes=new byte[1024];//                out.write(bytes);//                out.flush();                in.close();//                out.close();            }        } catch(Exception e) {            System.out.println("ERROR: " + e.getMessage());            System.exit(1);        }}}

国庆节前看了一个案例但是跑的时候发现是错误的 13年前的帖子，现在还用这计数也确实该多学点先进的技术了

https://coderanch.com/t/205623/java/Java-Http-Server-Java-Http

对客户端的程序参照网上找到的其他成功的程序改造了一下，加了两行发现成功了。。。

 con.setReadTimeout(5000);// 设置读取超时为5秒            con.setConnectTimeout(10000);// 设置连接网络超时为10秒

就是这个控制时间的两行，还没搞清楚为什么。可能是类似jdbc连接的时候的语句执行之后的刷新问题

public class Client {    public static void main(String[] args) {        try {            URL url = new URL("http://localhost:12001");            HttpURLConnection con = (HttpURLConnection) url.openConnection();            con.setDoOutput(true);//            con.setDoInput(true);            con.setRequestMethod("POST");//            con.setUseCaches(false);            con.setReadTimeout(5000);// 设置读取超时为5秒            con.setConnectTimeout(10000);// 设置连接网络超时为10秒            String test = "<name>Hello</name>";            byte[] bytes = test.getBytes();//            con.setRequestProperty("Content-type", "text/html");            OutputStream out = con.getOutputStream();            out.write(bytes);            out.flush();            out.close();            BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()));            String temp;            while((temp = in.readLine()) != null)                System.out.println(temp);//            out.close();            in.close();            con.disconnect();        } catch(Exception e) {            e.printStackTrace();            System.exit(1);}}}

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