java 实现http协议发送接收数据

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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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