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w7-成绩文件异常处理.txt

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+import java.io.BufferedReader;
+import java.io.FileNotFoundException;
+import java.io.FileReader;
+import java.io.IOException;
+
+public class ScoreCalculator {
+    public static void main(String[] args) {
+        // 使用try-with-resources确保流自动关闭
+        try (BufferedReader reader = new BufferedReader(new FileReader("scores.txt"))) {
+            String line;
+            int lineNumber = 0;
+            while ((line = reader.readLine()) != null) {
+                lineNumber++;
+                try {
+                    // 处理每行数据
+                    String[] parts = line.split(",");
+                    if (parts.length < 2) {
+                        throw new IllegalArgumentException("第" + lineNumber + "行数据格式错误: 缺少必要字段");
+                    }
+                    
+                    String studentId = parts[0].trim();
+                    if (studentId.isEmpty()) {
+                        throw new IllegalArgumentException("第" + lineNumber + "行数据格式错误: 学号为空");
+                    }
+                    
+                    try {
+                        double score = Double.parseDouble(parts[1].trim());
+                        System.out.println("学号: " + studentId + ", 成绩: " + score);
+                    } catch (NumberFormatException e) {
+                        System.err.println("第" + lineNumber + "行数据格式错误: 成绩不是有效数字 - " + e.getMessage());
+                    }
+                } catch (IllegalArgumentException e) {
+                    System.err.println(e.getMessage());
+                }
+            }
+        } catch (FileNotFoundException e) {
+            System.err.println("文件不存在: " + e.getMessage());
+        } catch (IOException e) {
+            System.err.println("文件读取错误: " + e.getMessage());
+        } catch (Exception e) {
+            System.err.println("发生未知错误: " + e.getMessage());
+        }
+    }
+}