createDirectory(path); } catch(FileAlreadyExistsException e){ // the directory already exists. } catch (IOException e) { //something else went wrong e.printStackTrace(); } 3. Files.copy() Path sourcePath destinationPath); } catch(FileAlreadyExistsException e) { //destination file already exists } catch (IOException e) { //something else went wrong e.printStackTrace(); } 4. Overwriting Existing Files REPLACE_EXISTING); } catch(FileAlreadyExistsException e) { //destination file already exists } catch (IOException e) { //something else went wrong e.printStackTrace(); } 5. Files.move() ● java.io.File

in the Student table. Create and save mybatisInsert.java file as shown below − import java.io.IOException; import java.io.Reader; import org.apache.ibatis.io.Resources; import org.apache.ibatis.session SqlSessionFactoryBuilder; public class mybatisInsert { public static void main(String args[]) throws IOException{ Reader reader = Resources.getResourceAsReader("SqlMapConfig.xml"); SqlSessionFactory the Student table. Create and save mybatisRead_ALL.java file as shown below − import java.io.IOException; import java.io.Reader; import java.util.List; import org.apache.ibatis.io.Resources; import

Java 异常处理机制 常见异常 O IOException ▶ 从一个不存在的文件中读取数据 ▶ 越过文件结尾继续读取 ▶ 连接一个不存在的 URL  IOException 示例 1 课程配套代码 ± sample.exception.IOExceptionSample.java 1上述代码无法编译：只要是有可能出现 IOException 的 Java 代码，在编 译时就会出错，而不会等到运行时才发生。 常用，在没有找到适合的异常处理代码时，系统也 会自动调用该方法输出错误信息。 大纲 异常的概念及分类 Java 异常处理机制 捕获和处理 IOException O 一些知识点 ▶ 异常类型的多态性 FileNotFoundException 是 IOException 的子类，基于多态性机制，后一个 catch 语句也可以处理 FileNotFoundException，因此前一个 catch 语句块可以取 运行时异常 ▶ 过度处理 课程配套代码 ± sample.exception.IOExceptionSample.java 大纲 异常的概念及分类 Java 异常处理机制 捕获和处理 IOException O 一些知识点 ▶ 异常类型的多态性 ▶ 运行时异常 对于只可能产生 RuntimeException 的代码可以 不使用 try-catch 语句进行处理，如果对于这些相对安全的 代码仍然采用了

viii 12.2.3 操纵异常对象 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157 12.2.4 捕获和处理 IOException . . . . . . . . . . . . . . . . . . . . . . . . 158 12.2.5 声明抛出异常 . . . . . . . . . . . . . . 2. JAVA 流程控制 � 2 � 2 public class MyClass { 3 public static void main(String[] args) throws IOException { 4 int num1, num2; 5 String str1, str2; 6 InputStreamReader in; 7 in = new InputStreamReader(System 读取控制台输入的传统方法 1 import java.io.InputStreamReader; 2 import java.io.BufferedReader; 3 import java.io.IOException; 5 public class TestStandardInput { . . . . . . . . . . . . . . . . . . . . . . . . . . . .

protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { req.getRequestDispatcher("/WEB-INF/jsp/login.jsp").forward(req, resp); } @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { String error = null; String username = req.getParameter("username"); ServletException, IOException { doPost(req, resp); } @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { String

serializers/deserializers as inner classes, as shown in the following example: 127 Java import java.io.IOException; import com.fasterxml.jackson.core.JsonGenerator; import com.fasterxml.jackson.core.JsonParser; public void serialize(MyObject value, JsonGenerator jgen, SerializerProvider serializers) throws IOException { jgen.writeStartObject(); jgen.writeStringField("name", value.getName()); public MyObject deserialize(JsonParser jsonParser, DeserializationContext ctxt) throws IOException { ObjectCodec codec = jsonParser.getCodec(); JsonNode tree = codec.readTree(jsonParser);

serializers/deserializers as inner classes, as shown in the following example: 127 Java import java.io.IOException; import com.fasterxml.jackson.core.JsonGenerator; import com.fasterxml.jackson.core.JsonParser; public void serialize(MyObject value, JsonGenerator jgen, SerializerProvider serializers) throws IOException { jgen.writeStartObject(); jgen.writeStringField("name", value.getName()); public MyObject deserialize(JsonParser jsonParser, DeserializationContext ctxt) throws IOException { ObjectCodec codec = jsonParser.getCodec(); JsonNode tree = codec.readTree(jsonParser);

serializers/deserializers as inner classes, as shown in the following example: 128 Java import java.io.IOException; import com.fasterxml.jackson.core.JsonGenerator; import com.fasterxml.jackson.core.JsonParser; public void serialize(MyObject value, JsonGenerator jgen, SerializerProvider serializers) throws IOException { jgen.writeStartObject(); jgen.writeStringField("name", value.getName()); public MyObject deserialize(JsonParser jsonParser, DeserializationContext ctxt) throws IOException { ObjectCodec codec = jsonParser.getCodec(); JsonNode tree = codec.readTree(jsonParser);

serializers/deserializers as inner classes, as shown in the following example: 228 Java import java.io.IOException; import com.fasterxml.jackson.core.JsonGenerator; import com.fasterxml.jackson.core.JsonParser; public void serialize(MyObject value, JsonGenerator jgen, SerializerProvider serializers) throws IOException { jgen.writeStringField("name", value.getName()); jgen.writeNumberField("age" public MyObject deserialize(JsonParser jsonParser, DeserializationContext ctxt) throws IOException { ObjectCodec codec = jsonParser.getCodec(); JsonNode tree = codec.readTree(jsonParser);

serializers/deserializers as inner classes, as shown in the following example: 127 Java import java.io.IOException; import com.fasterxml.jackson.core.JsonGenerator; import com.fasterxml.jackson.core.JsonParser; public void serialize(MyObject value, JsonGenerator jgen, SerializerProvider serializers) throws IOException { jgen.writeStartObject(); jgen.writeStringField("name", value.getName()); public MyObject deserialize(JsonParser jsonParser, DeserializationContext ctxt) throws IOException { ObjectCodec codec = jsonParser.getCodec(); JsonNode tree = codec.readTree(jsonParser);