在eclipse上的练习

javademo/MyProject/.classpath

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+<?xml version="1.0" encoding="UTF-8"?>
+<classpath>
+	<classpathentry kind="src" path="src"/>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.8"/>
+	<classpathentry kind="con" path="org.eclipse.jdt.junit.JUNIT_CONTAINER/4"/>
+	<classpathentry kind="lib" path="D:/app/Administrator/product/11.2.0/dbhome_1/jdbc/lib/ojdbc6.jar"/>
+	<classpathentry kind="output" path="bin"/>
+</classpath>

javademo/MyProject/.project

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+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>MyProject</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.jdt.core.javabuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.eclipse.jdt.core.javanature</nature>
+	</natures>
+</projectDescription>

javademo/MyProject/.settings/org.eclipse.jdt.core.prefs

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+eclipse.preferences.version=1
+org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled
+org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.8
+org.eclipse.jdt.core.compiler.codegen.unusedLocal=preserve
+org.eclipse.jdt.core.compiler.compliance=1.8
+org.eclipse.jdt.core.compiler.debug.lineNumber=generate
+org.eclipse.jdt.core.compiler.debug.localVariable=generate
+org.eclipse.jdt.core.compiler.debug.sourceFile=generate
+org.eclipse.jdt.core.compiler.problem.assertIdentifier=error
+org.eclipse.jdt.core.compiler.problem.enumIdentifier=error
+org.eclipse.jdt.core.compiler.source=1.8

javademo/MyProject/src/com/cfxyz/demo/CopyDemo.java

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+package com.cfxyz.demo;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.InputStream;
+import java.io.OutputStream;
+
+/** 模拟DOS系统中的COPY程序
+ * 命令行参数  （ 源文件  目标文件）
+ */
+public class CopyDemo {
+
+	public static void main(String[] args) throws Exception{
+		long start = System.currentTimeMillis();
+		if(args.length != 2) { //初始化参数不足两位
+			System.out.println("命令执行错误！");
+			System.exit(1); //程序退出执行
+		}
+		// 如果输入参数正确了，那么应该进行文件的验证
+		File inFile = new File(args[0]); //第一个为源文件路径
+		if (!inFile.exists()) { //源文件不存在
+			System.out.println("源文件不存在，请确认执行路径。");
+			System.exit(1); //程序退出
+		}
+		// 如果此时源文件正确，那么就需要定义输出文件，同时考虑到输出文件有目录
+		File outFile = new File(args[1]);
+		if (!outFile.getParentFile().exists()) {
+			outFile.getParentFile().mkdirs(); //创建目录
+		}
+		// 实现文件内容的拷贝
+		InputStream input = new FileInputStream(inFile);
+		OutputStream output = new FileOutputStream(outFile);
+		// 实现文件拷贝
+		int temp = 0;  //保存每次读取的个数
+		byte data[] = new byte [2048]; // 每次读取2048个字节
+		// 将每次读取的数据保存在字节数组里面，并且返回读取的个数
+		while((temp = input.read(data)) != -1) {
+			output.write(data, 0, temp); //输出数组
+		}
+		input.close();
+		output.close();
+		long end = System.currentTimeMillis();
+		System.out.println("拷贝完成!\n花费的时间：" + (end - start) + "毫秒");
+	}
+
+}

javademo/MyProject/src/com/cfxyz/demo/EchoClient.java

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+package com.cfxyz.demo;
+
+import java.io.PrintStream;
+import java.net.Socket;
+import java.util.Scanner;
+
+public class EchoClient {
+
+	public static void main(String[] args) throws Exception {
+		Socket client = new Socket("localhost", 9999); //连接服务端
+		Scanner input = new Scanner(System.in);
+		Scanner scan = new Scanner(client.getInputStream());
+		input.useDelimiter("\n");
+		scan.useDelimiter("\n");
+		PrintStream out = new PrintStream(client.getOutputStream());
+		boolean flag = true;
+		while(flag) {
+			System.out.print("请输入要发送的数据:");
+			if(input.hasNext()) {
+				String str = input.next().trim();
+				out.println(str); //发送服务器端数据
+				if(str.equalsIgnoreCase("byebye")) {
+					flag = false; //结束循环
+				}
+				if(scan.hasNext()) {
+					System.out.println(scan.next());
+				}
+			}
+		}
+		input.close();
+		scan.close();
+		out.close();
+		client.close();
+	}
+
+}

javademo/MyProject/src/com/cfxyz/demo/EchoServer.java

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+package com.cfxyz.demo;
+
+import java.io.PrintStream;
+import java.net.ServerSocket;
+import java.net.Socket;
+import java.util.Scanner;
+
+class EchoThread implements Runnable {
+	private Socket client;
+	public EchoThread(Socket client) {
+		this.client = client;
+	}
+
+	@Override
+	public void run() {
+		try {
+			// 得到客户端输入数据以及向客户端输出数据的对象
+			Scanner scan = new Scanner(client.getInputStream());
+			PrintStream out = new PrintStream(client.getOutputStream());
+			boolean flag = true;
+			while(flag) {
+				if(scan.hasNext()) {
+					String str = scan.next().trim(); //得到客户端发送的内容
+					if(str.equalsIgnoreCase("byebye")) {
+						out.println("拜拜，下次再会！"); //程序要结束
+						flag = false;
+					} else {   //回应输入信息
+						out.println("ECHO : " + str);
+					}
+				}
+			}
+			System.out.println("客户端关闭连接.....");
+			scan.close();
+			out.close();
+			client.close();
+		}catch(Exception e){
+			e.printStackTrace();
+		}
+	}
+}
+
+public class EchoServer {
+
+	public static void main(String[] args) throws Exception {
+		ServerSocket server = new ServerSocket(9999);
+		System.out.println("等待连接.....");
+		boolean flag = true;
+		while(flag) {
+			Socket client = server.accept();   //连接客户端
+			new Thread(new EchoThread(client)).start();
+			System.out.println("客户端已经连接.....");
+		}
+		server.close();
+	}
+
+}

javademo/MyProject/src/com/cfxyz/demo/Hello.java

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+package com.cfxyz.demo;
+
+class Foo {
+	public Foo(Object x) {
+		System.out.println(x);
+	}
+}
+
+public class Hello {
+
+	public static void main(String[] args) {
+		int x = 0 ;
+		Object y = null;
+		Integer xxx = new Integer(x);
+		Foo fx = new Foo(xxx);
+		Foo fy = new Foo(y);
+
+	}
+
+}

javademo/MyProject/src/com/cfxyz/demo/HelloClient.java

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+package com.cfxyz.demo;
+
+import java.net.Socket;
+import java.util.Scanner;
+
+public class HelloClient {
+
+	public static void main(String[] args) throws Exception {
+		Socket client = new Socket("localhost", 9999); //连接服务器端
+		//取得客户端的输入数据流对象，表示接收服务器端的输出信息
+		Scanner scan = new Scanner(client.getInputStream());
+		scan.useDelimiter("\n");
+		if(scan.hasNext()) {
+			System.out.println("【回应数据】" + scan.next());
+		}
+		System.out.println("关闭客户端连接");
+		scan.close();
+		client.close();
+	}
+
+}

javademo/MyProject/src/com/cfxyz/demo/HelloServer.java

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+package com.cfxyz.demo;
+
+import java.io.PrintStream;
+import java.net.ServerSocket;
+import java.net.Socket;
+
+public class HelloServer {
+
+	public static void main(String[] args) throws Exception {
+		ServerSocket server = new ServerSocket(9999);
+		System.out.println("等待客户端连接.....");
+		Socket client = server.accept();  //等待客户端连接
+		//利用打印流完成输出
+		PrintStream out = new PrintStream(client.getOutputStream());
+		out.println("Hello World!");
+		System.out.println("关闭服务器端连接");
+		out.close();
+		client.close();
+		server.close();
+	}
+
+}

javademo/MyProject/src/com/cfxyz/demo/TestArrayList.java

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+package com.cfxyz.demo;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class TestArrayList {
+
+	public static void main(String[] args) {
+		List<String> all = new ArrayList<String>();
+		System.out.println("List长度：" + all.size() + "，是否为空：" + all.isEmpty());
+		all.add("Hello!!!");
+		all.add("Hello!!!");
+		all.add("Hello!!!");
+		all.add("World!!!");
+		System.out.println("List长度：" + all.size() + "，是否为空：" + all.isEmpty());
+		for(int x = 0; x < all.size(); x ++) {
+			System.out.println(all.get(x));
+		}
+	}
+
+}

javademo/MyProject/src/com/cfxyz/demo/TestArrays.java

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+package com.cfxyz.demo;
+
+import java.util.Arrays;
+
+class Book implements Comparable<Book>{ //实现比较
+	private String title;
+	private double price;
+	public Book(String title, double price) {
+		this.title = title;
+		this.price = price;
+	}
+	@Override
+	public String toString() {
+		return "Book [title=" + title + ", price=" + price + "]\n";
+	}
+	@Override
+	public int compareTo(Book o) {
+		if(this.price > o.price) {
+			return 1;
+		}else if (this.price < o.price) {
+			return -1;
+		}else {
+			return 0;
+		}
+	}
+
+}
+
+public class TestArrays {
+
+	public static void main(String[] args) {
+//		int data[] = {1,4,5,6,7,8,9,2,3};
+//		java.util.Arrays.sort(data);
+//		System.out.println(Arrays.binarySearch(data, 8));
+//		int dataA[] = new int [] {1,2,3};
+//		int dataB[] = new int [] {2,3,1};
+//		System.out.println(Arrays.equals(dataA, dataB));
+//		int dataC[] = new int [10];
+//		Arrays.fill(dataC, 4);
+//		System.out.println(Arrays.toString(dataC));
+		Book books [] = new Book [] {
+				new Book("java开发", 79.8),
+				new Book("ocale开发", 239.8),
+				new Book("android开发", 49.8),
+				new Book("jsp开发", 34.8)
+		};
+		Arrays.sort(books);
+		System.out.println(Arrays.toString(books));
+	}
+
+}

javademo/MyProject/src/com/cfxyz/demo/TestBatch.java

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+package com.cfxyz.demo;
+
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.Statement;
+import java.util.Arrays;
+
+/*
+ * Oracle数据库脚本
+DROP TABLE member PURGE ;
+DROP SEQUENCE myseq ;
+CREATE SEQUENCE myseq ;
+CREATE TABLE member (
+    mid         NUMBER,
+    name        VARCHAR2(20),
+    birthday    DATE DEFAULT SYSDATE ,
+    age         NUMBER(3),
+    note        CLOB,
+    CONSTRAINT pk_mid PRIMARY KEY(mid)
+);
+ */
+
+public class TestBatch {
+	private static final String DBDRIVER = "oracle.jdbc.driver.OracleDriver";
+	private static final String DBURL = "jdbc:oracle:thin:@localhost:1521:orcl";
+	private static final String USER = "scott";
+	private static final String PASSWORD = "tiger";
+
+	public static void main(String[] args) throws Exception {
+		Class.forName(DBDRIVER);
+		Connection conn = DriverManager.getConnection(DBURL, USER, PASSWORD);
+		Statement stmt = conn.createStatement();
+		conn.setAutoCommit(false); //取消自动提交
+		try {
+			stmt.addBatch("INSERT INTO member(mid,name) VALUES (myseq.nextval, '测试	A')");
+			stmt.addBatch("INSERT INTO member(mid,name) VALUES (myseq.nextval, '测试B')");
+			stmt.addBatch("INSERT INTO member(mid,name) VALUES (myseq.nextval, '测试	C')");
+			stmt.addBatch("INSERT INTO member(mid,name) VALUES (myseq.nextval, '测试	D')");
+			stmt.addBatch("INSERT INTO member(mid,name) VALUES (myseq.nextval, '测试	E')");
+			int result [] = stmt.executeBatch(); //执行处理
+			System.out.println(Arrays.toString(result));
+			conn.commit(); //如果没有错误，进行提交
+		} catch(Exception e) {
+			e.printStackTrace();
+			conn.rollback(); //如果出现异常则进行回滚
+		}
+		conn.close();
+	}
+
+}