Java第二十天
来源：互联网 发布：岑村转让网络 编辑：程序博客网 时间：2024/06/05 15:36
/MyTestServlet
package com.lingzhuo.test;import java.io.IOException;import java.sql.Connection;import java.sql.PreparedStatement;import java.sql.ResultSet;import java.sql.SQLException;import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;/** * Servlet implementation class MyTestServlet */@WebServlet("/MyTestServlet")public class MyTestServlet extends HttpServlet { private static final long serialVersionUID = 1L; /** * @see HttpServlet#HttpServlet() */ public MyTestServlet() { super(); // TODO Auto-generated constructor stub } /** * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse * response) */ protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {// try {// Thread.sleep(10000);// } catch (InterruptedException e) {// // TODO Auto-generated catch block// e.printStackTrace();// } //浏览器按回车提交(调用doGet)url给服务器 request.getParameter("user_name")从服务器请求数据得到的是iso-8859-1编码的所以要进行编码转换 //然后打印在控制台 String userName = request.getParameter("user_name"); String password = request.getParameter("password");// userName = Encoding.doEncodign(userName);// password = Encoding.doEncodign(password); //而使用httpclientdoget的时候则不需要这两句(不需要格式转换) //通过网页输入的话网页输入会调用doGet方法 网页的编码是iso-8859-1 //所以要转换成字节存在字节数组里面在通过newString()方法将字节转换成utf-8格式的 System.out.println("用户名:" + userName); System.out.println("密 码:" + password); String s = ""; // 需要将jdbc的jar包放在WEB-INF下的lib目录下 Connection conn = SQLManager.newInstance().getConnection();//得到与数据库的连接 服务器与数据库之间的链接为同一条连接 try { //预处理操作类 PreparedStatement state = conn.prepareStatement("select * from user where user_name=? and password=?"); state.setString(1, userName);//将指定参数设置为给定 JavaString值 1是从左到右遇到的第一个通配符? state.setString(2, password); ResultSet set = state.executeQuery();//执行SQL查询 并返回该查询给resultSet set.last();//最后一行 int num = set.getRow(); if (num == 1) { s = "登陆成功"; } else { s = "用户名或密码错误"; } } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } // 设置服务器端的输出流的编码 Content-type为实体头 response.setHeader("Content-type", "text/html;charset=UTF-8");//设置要放在输出语句的前面 有这一句的话网页上显示的也不会是乱码的 response.getWriter().append(userName+password);//服务器将信息推送给客户端 try { Thread.sleep(10000); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } response.getWriter().append(s);//服务器将信息推送给客户端 } //post 是吧数据写给服务端// get是通过传递参数 传递到服务端http:............../userServlet?method=login&name=zhangsan&password=123 /** * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse * response) */ protected void doPost(HttpServletRequest request, HttpServletResponse response)//请求 推送 throws ServletException, IOException { // TODO Auto-generated method stub doGet(request, response); }}Encoding
package com.lingzhuo.test;import java.io.UnsupportedEncodingException;public class Encoding { public static String doEncodign(String string) { try { byte[] array=string.getBytes("ISO-8859-1"); string = new String(array, "UTF-8"); } catch (UnsupportedEncodingException e) { // TODO Auto-generated catch block e.printStackTrace(); } return string; }}HTTPURLConnectionDoGet
package com.lingzhuo.test;import java.awt.BorderLayout;import java.awt.EventQueue;import javax.swing.JFrame;import javax.swing.JPanel;import javax.swing.border.EmptyBorder;import javax.swing.JButton;import java.awt.event.ActionListener;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.net.ConnectException;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.SocketTimeoutException;import java.net.URL;import java.net.URLConnection;import java.awt.event.ActionEvent;public class HTTPURLConnectionDoGet extends JFrame { private JPanel contentPane; /** * Launch the application. */ public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { public void run() { try { HTTPURLConnectionDoGet frame = new HTTPURLConnectionDoGet(); frame.setVisible(true); } catch (Exception e) { e.printStackTrace(); } } }); } //get只有一个流，参数附加在url后，大小个数有严格限制且只能是字符串。 //post的参数是通过另外的流传递的，不通过url，所以可以很大，也可以传递二进制数据，如文件的上传。 /** * Create the frame. */ public HTTPURLConnectionDoGet() { setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setBounds(100, 100, 450, 300); contentPane = new JPanel(); contentPane.setBorder(new EmptyBorder(5, 5, 5, 5)); setContentPane(contentPane); contentPane.setLayout(null); // HttpURLConnection doGet方法获取的只是服务器数据 JButton btnDoget = new JButton("DoGet");// 显示的 btnDoget.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent arg0) { String urlString = "http://localhost:8080/MyServiceTest/MyTestServlet?user_name=zhangsan&password=123456"; try { // 生成一个URL URL url = new URL(urlString);// 根据String形式表示该URl对象 URLConnection connect = url.openConnection();// 打开url连接 // 强制类型转换成HttpURLConnection HttpURLConnection httpURLConnection = (HttpURLConnection) connect;//httpURLConnection 服务器得到链接需需要等十秒才想赢回来(服务器一直监听等待连接的到来) // 设置请求方法为Get httpURLConnection.setRequestMethod("GET");//开始通过服务器得到数据 运行服务器的doGet方法跳转到服务器url后直接更上要给数据库提交的内容其中开头有一个问号(传递参数) // 设置连接超时时间 httpURLConnection.setConnectTimeout(3000); // 设置读取超时时间 httpURLConnection.setReadTimeout(30000); // 设置编码格式和设置接收的数据类型 httpURLConnection.setRequestProperty("Accept-Charset", "utf-8");// 固定格式死记 // 设置可以接受序列化的java对象 httpURLConnection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");// 固定格式死记 int code = httpURLConnection.getResponseCode();// 得到http状态码 System.out.println("HTTP的状态码是:" + code); if (code == httpURLConnection.HTTP_OK) { InputStream is=httpURLConnection.getInputStream(); BufferedReader br = new BufferedReader( new InputStreamReader(is));// BufferedReader br = new BufferedReader(// new InputStreamReader(is)); String theLine = br.readLine(); while (theLine != null) {// try {// Thread.sleep(6000);// } catch (InterruptedException e) {// // TODO Auto-generated catch block// e.printStackTrace();// } System.out.println(theLine); theLine = br.readLine(); } } } catch (MalformedURLException e) { // TODO Auto-generated catch block e.printStackTrace(); } // 捕捉连接超时异常 catch (SocketTimeoutException e) { System.out.println("网络连接超时"); } catch (ConnectException e) { System.out.println("连接出现异常"); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }); btnDoget.setBounds(145, 116, 93, 67); contentPane.add(btnDoget); }}HTTPURLConnectionDoPost
package com.lingzhuo.test;import java.awt.EventQueue;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.URL;import java.net.URLConnection;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JPanel;import javax.swing.border.EmptyBorder;public class HTTPURLConnectionDoPost extends JFrame { private JPanel contentPane; /** * Launch the application. */ public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { public void run() { try { HTTPURLConnectionDoPost frame = new HTTPURLConnectionDoPost(); frame.setVisible(true); } catch (Exception e) { e.printStackTrace(); } } }); } /** * Create the frame. */ public HTTPURLConnectionDoPost() { setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setBounds(100, 100, 450, 300); contentPane = new JPanel(); contentPane.setBorder(new EmptyBorder(5, 5, 5, 5)); setContentPane(contentPane); contentPane.setLayout(null); JButton btnNewButton = new JButton("DoPost测试"); btnNewButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent arg0) { //doPost是隐式的 String urlString="http://localhost:8080/MyServiceTest/MyTestServlet";//不含有参数 MyServiceTest为服务器 try { URL url = new URL(urlString);//根据String得到一个url URLConnection connection=url.openConnection();//返回一个 URLConnection对象，它表示到 URL所引用的远程对象的连接。 HttpURLConnection httpURLConnection = (HttpURLConnection)connection;//强转为HttpURLConnection// //设置连接超时时间// httpURLConnection.setConnectTimeout(30000);// //设置读取超时时间// httpURLConnection.setReadTimeout(30000); //设置编码格式和设置接收的数据类型 httpURLConnection.setRequestProperty("Accept-Charset", "utf-8");//固定格式死记 //设置可以接受序列化的java对象 httpURLConnection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");//固定格式死记 //你提交数据给服务器 服务器在响应数据给你 //设置请求方法 httpURLConnection.setRequestMethod("POST"); //设置可以读取服务器的返回内容默认为true httpURLConnection.setDoInput(true);//可以不写 //设置客户端可以给服务器提交数据，默认是false httpURLConnection.setDoOutput(true); //post方法不允许使用缓存 httpURLConnection.setUseCaches(false);//固定的记住 String params="user_name=zhangsan&password=1234546";//需要给服务器发送的字符串 //通过httpURLConnection发送给服务器 httpURLConnection.getOutputStream().write(params.getBytes()); //getoutputStream().write(里面可以使字节) 写了之后服务器(一直开着)就开始读取了 //进入服务器 需要等上十秒才可以回到自己线程 //httpURLConnection int code=httpURLConnection.getResponseCode(); try { Thread.sleep(10000); } catch (InterruptedException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } System.out.println("HTTP的状态码是:"+code); if(code==httpURLConnection.HTTP_OK) { try { Thread.sleep(6000); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } InputStream is=httpURLConnection.getInputStream(); BufferedReader br=new BufferedReader(new InputStreamReader(is)); String line=br.readLine(); while(line!=null) { System.out.println(line); line=br.readLine(); } } } catch (MalformedURLException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); }; } }); btnNewButton.setBounds(146, 117, 130, 76); contentPane.add(btnNewButton); }}SQLManager
package com.lingzhuo.test;import java.sql.Connection;import java.sql.DriverManager;import java.sql.SQLException;public class SQLManager { private Connection connection; private static SQLManager manager; public Connection getConnection() { return connection; } public static synchronized SQLManager newInstance() { if (manager == null) { manager = new SQLManager(); } return manager; } private SQLManager() { { // 连接数据库的驱动 String driver = "com.mysql.jdbc.Driver"; // url指向要访问的数据库clazz String url = "jdbc:mysql://localhost:3306/clazz"; // mysql配置的用户名 String user = "root"; // mysql配置密码 String password = "201216328"; try { // 加载数据库驱动 Class.forName(driver); // 获得连接 connection = DriverManager.getConnection(url, user, password);//为了得到同一个连接 连数据库的链接也有好多条 } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (ClassNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }}DoPostTest
package com.lingzhuo.test;import java.awt.BorderLayout;import java.awt.EventQueue;import javax.swing.JFrame;import javax.swing.JPanel;import javax.swing.border.EmptyBorder;import javax.swing.JButton;import java.awt.event.ActionListener;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.URL;import java.awt.event.ActionEvent;public class DoPostTest extends JFrame { private JPanel contentPane; /** * Launch the application. */ public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { public void run() { try { DoPostTest frame = new DoPostTest(); frame.setVisible(true); } catch (Exception e) { e.printStackTrace(); } } }); } /** * Create the frame. */ public DoPostTest() { setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setBounds(100, 100, 784, 635); contentPane = new JPanel(); contentPane.setBorder(new EmptyBorder(5, 5, 5, 5)); setContentPane(contentPane); contentPane.setLayout(null); JButton btnNewButton = new JButton("New button"); btnNewButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent arg0) { String urlString = "http://localhost:8080/MyServiceTest/MyTestServlet"; try { URL url = new URL(urlString); HttpURLConnection httpConnection = (HttpURLConnection) url.openConnection(); //设置连接超时的时间 httpConnection.setConnectTimeout(30000);//没什么用 //读取时间超时 httpConnection.setReadTimeout(30000); //设置编码格式 // 设置接受的数据类型 httpConnection.setRequestProperty("Accept-Charset", "utf-8");//固定 // 设置可以接受序列化的java对象 httpConnection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded"); //设置请求方法 httpConnection.setRequestMethod("POST");// httpConnection.setDoInput(true);//设置可以读取服务器返回的内容，默认为true //设置客户端可以给服务器提交数据，默认是false的。post方法必须设置为true httpConnection.setDoOutput(true); //post方法不允许使用缓存 httpConnection.setUseCaches(false); String params="user_name=zhangsan&password=123456"; httpConnection.getOutputStream().write(params.getBytes());//服务器对httpConnection优先级比较高 System.out.println("-------------------"); int code=httpConnection.getResponseCode();//连接反应的状态码 System.out.println(code); if(code==HttpURLConnection.HTTP_OK){ InputStream is=httpConnection.getInputStream();//从连接中得到输入流 BufferedReader br=new BufferedReader(new InputStreamReader(is)); String line=br.readLine(); while(line!=null){ System.out.println(line); line=br.readLine(); } } } catch (MalformedURLException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }); btnNewButton.setBounds(228, 130, 293, 278); contentPane.add(btnNewButton); }}HttpClientDoGet
package com.lingzhuo.test;//需要导入httpclient jar 以及json jarimport java.awt.EventQueue;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.net.HttpURLConnection;import java.util.concurrent.TimeUnit;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JPanel;import javax.swing.border.EmptyBorder;import org.apache.http.HttpEntity;import org.apache.http.HttpResponse;import org.apache.http.StatusLine;import org.apache.http.client.ClientProtocolException;import org.apache.http.client.HttpClient;import org.apache.http.client.fluent.Response;import org.apache.http.client.methods.HttpGet;import org.apache.http.impl.client.DefaultHttpClient;import org.apache.http.impl.client.HttpClientBuilder;public class HttpClientDoGet extends JFrame { private JPanel contentPane; /** * Launch the application. */ public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { public void run() { try { HttpClientDoGet frame = new HttpClientDoGet(); frame.setVisible(true); } catch (Exception e) { e.printStackTrace(); } } }); } /** * Create the frame. */ public HttpClientDoGet() { setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setBounds(100, 100, 683, 516); contentPane = new JPanel(); contentPane.setBorder(new EmptyBorder(5, 5, 5, 5)); setContentPane(contentPane); contentPane.setLayout(null); //没有使用connection JButton btnNewButton = new JButton("HttpClientDoGet"); btnNewButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { String urlString="http://localhost:8080/MyServiceTest/MyTestServlet?user_name=zhangsan&password=123456"; HttpClientBuilder builder=HttpClientBuilder.create();//httpclientbuilder创建者 //创建生成client的buidler //设置超时时间 builder.setConnectionTimeToLive(3000, TimeUnit.MILLISECONDS); HttpClient client=builder.build();//builder生成client HttpGet get=new HttpGet(urlString);//设置为get方法 get.setHeader("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8"); //设置服务器接收后数据的读取方式为utf8 try { System.out.println(2); HttpResponse response=client.execute(get);//执行get对象 跳转到服务器 得到服务器的返回的所有数据都在response中 System.out.println("-------------"); StatusLine statusLine=response.getStatusLine();//httpClient访问服务器返回的表头，包含http状态码 int code=statusLine.getStatusCode();//得到状态码 System.out.println(code); if(code==HttpURLConnection.HTTP_OK){ HttpEntity entity=response.getEntity();//得到数据的实体 InputStream is=entity.getContent();//得到输入流 BufferedReader br=new BufferedReader(new InputStreamReader(is)); String line=br.readLine(); while(line!=null){ System.out.println(line); line=br.readLine(); } } } catch (ClientProtocolException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } catch (IOException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } } }); btnNewButton.setBounds(221, 150, 218, 169); contentPane.add(btnNewButton); }}#
package com.lingzhuo.test;import java.awt.EventQueue;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.io.UnsupportedEncodingException;import java.util.ArrayList;import java.util.concurrent.TimeUnit;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JPanel;import javax.swing.border.EmptyBorder;import org.apache.http.HttpEntity;import org.apache.http.HttpResponse;import org.apache.http.NameValuePair;import org.apache.http.client.ClientProtocolException;import org.apache.http.client.HttpClient;import org.apache.http.client.entity.UrlEncodedFormEntity;import org.apache.http.client.methods.HttpPost;import org.apache.http.impl.client.HttpClientBuilder;import org.apache.http.message.BasicNameValuePair;import org.apache.http.protocol.HTTP;public class HttpClientDoPost extends JFrame { private JPanel contentPane; /** * Launch the application. */ public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { public void run() { try { HttpClientDoPost frame = new HttpClientDoPost(); frame.setVisible(true); } catch (Exception e) { e.printStackTrace(); } } }); } /** * Create the frame. */ public HttpClientDoPost() { setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setBounds(100, 100, 810, 665); contentPane = new JPanel(); contentPane.setBorder(new EmptyBorder(5, 5, 5, 5)); setContentPane(contentPane); contentPane.setLayout(null);//不同点一：////通过get方式提交的数据有大小的限制，通常在1024字节左右。也就是说如果提交的数据很大，用get方法就可需要小心；而post方式没有数据大小的限制，理论上传送多少数据都可以。//不同点二：////通过get传递数据，实际上是将传递的数据按照”key，value”的方式跟在URL的后面来达到传送的目的的；而post传递数据是通过http请求的附件进行的，在URL中并没有明文显示。// 1.创建HttpGet或HttpPost对象，将要请求的URL通过构造方法传入HttpGet或HttpPost对象。//// 2.使用DefaultHttpClient类的execute方法发送HTTP GET或HTTP POST请求，并返回HttpResponse对象。//// 3.通过HttpResponse接口的getEntity方法返回响应信息，并进行相应的处理。 JButton btnNewButton = new JButton("HttpClientDoPost"); btnNewButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent arg0) { String url="http://192.168.0.52:8080/MyServiceTest/MyTestServlet";//隐式url HttpClientBuilder builder=HttpClientBuilder.create(); //设置连接超时时间 ConnectionTimeToLive连接的生命周期 builder.setConnectionTimeToLive(3000, TimeUnit.MILLISECONDS);//3秒 HttpClient client=builder.build();//得到client HttpPost post=new HttpPost(url);//设置为post方法 传入参数url NameValuePair pair1=new BasicNameValuePair("user_name", "张三");//(String name,String value) NameValuePair pair2=new BasicNameValuePair("password", "123456"); ArrayList<NameValuePair> params=new ArrayList<>();//数组链表 params.add(pair1); params.add(pair2); try { post.setEntity(new UrlEncodedFormEntity(params, "UTF-8")); post.setHeader("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8"); System.out.println(2); HttpResponse response=client.execute(post);//client一执行就到服务器了 等服务器运行完才会回来 System.out.println("--------------"); int code=response.getStatusLine().getStatusCode(); System.out.println(code); if(code==200){ HttpEntity entity=response.getEntity();//回应中得到实体 InputStream is=entity.getContent();//得到实体内容生成输入流 BufferedReader br=new BufferedReader(new InputStreamReader(is)); String line=br.readLine(); while(line!=null){ System.out.println(line); line=br.readLine(); } } } catch (UnsupportedEncodingException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (ClientProtocolException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }); btnNewButton.setBounds(193, 162, 305, 199); contentPane.add(btnNewButton); }} 0 0
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