java 实现http协议发送接收数据
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 = "Hello ";
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);}}}