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本周学习内容 java语言基础、面向对象、集合类、本地文件操作、IO操作、多线程、网络通信和JDBC Maven的配置与使用 Docker中的MySQL、Navicat和IDEA的连接与使用 JDBC 编写流程 加载驱动 打开连接 执行查询 处理结果 清理环境 mysql 增删改查的模板 <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>8.0.11</version> </dependency> public class JDBCDemo { public static void main(String [] args){ String sql = "SELECT * FROM tbl_user"; Connection conn = null; Statement st = null; ResultSet rs = null; try{ conn = DriverManager.getConnection("jdbc:mysql://192.168.99.100:3306/aaoo","root","1234567"); st = conn.createStatement(); rs = st.executeQuery(sql); while(rs.next()){ System.out.print(rs.getInt("id")+" "); System.out.print(rs.getString("name")+" "); System.out.print(rs.getString("password")+" "); System.
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考试题1 针对pdf打不开的问题进行改正：
public class App { public static void main( String[] args ) { try { // 实际不确定文件类型的时候，需要用字节流进行传递，之后会原样输出，否则会有错误 URL url = new URL("http://192.168.11.205:18080/trainning/SampleChapter1.pdf"); URLConnection connection = url.openConnection(); InputStream is = connection.getInputStream(); byte [] getData = readInputStream(is); File f1 = new File("Exam1/tmp"); if(!f1.exists()) { f1.mkdir(); } File file = new File("Exam1/tmp/SampleChapter1.pdf"); FileOutputStream fos = new FileOutputStream(file); fos.write(getData); if (fos!=null){ fos.close(); } if (is != null){ is.close(); } } catch (MalformedURLException e) { e.
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