我正在使用以下代码提取一些数据并将其保存到CSV文件。但是现在的问题是该程序将数据写入CSV文件，并且每当代码再次运行时，该数据就会被删除，而旧结果将被新结果替换！问题是，是否可以保存结果并将新结果存储在新行中？如果是，那该怎么办？
这是我的代码：
private void writeReport() {
BufferedWriter out = null;
try {
FileWriter fstream = new FileWriter("out.csv");
out = new BufferedWriter(fstream);
out.write("File Name;");
out.write("Total Lines of Code;");
out.write("Executable Lines;");
out.write("Lines of Comments;");
out.write("Trivial Lines;");
out.write("Empty Lines;");
out.write("Code Complexity;");
out.write("Number of Files;"); //to be changed to numver of files
out.write("Average File Complexity;"); //to be changed to averag file complexity
out.write("Comment Percentage;"); //total
out.write("Total Lines of Test Code;");
out.write("Total Comments in Tests;");
out.write("Total Trivial Lines in Tests;");
out.write("Total Empty Lines in Tests;");
out.write("Total Number of Test Files;");
out.write("Comment Presentage in Test;");
out.write(System.getProperty("line.separator"));
// for (int i = 0; i < newFiles.getNrOfFiles(); i++) {
out.write("test" + ";");
// out.write(newFiles.getParser(i).getSourceFile().getName()+ ";");
out.write(String.valueOf(newFiles.sumLinesOfCode()) + ";");
out.write(String.valueOf(newFiles.sumLinesOfStatements()) + ";");
out.write(String.valueOf(newFiles.sumLinesOfComments()) + ";");
out.write(String.valueOf(newFiles.sumTrivialLines()) + ";");
out.write(String.valueOf(newFiles.sumEmptyLines()) + ";");
out.write(String.valueOf(newFiles.sumComplexity())+ ";");
out.write(String.valueOf(newFiles.getNrOfFiles()) + ";");
out.write(String.valueOf(newFiles.sumAvgComplexity()) + ";");
out.write(String.valueOf((100 * newFiles.sumLinesOfComments()) / newFiles.sumLinesOfCode() + "%") + ";");
out.write(System.getProperty("line.separator"));
//Close the output stream
out.close();
} catch (Exception e) {
System.err.println("Error: " + e.getMessage());
// return;
}
}
确定文件是否已经存在
File file = new File("out.csv");
boolean exists = file.exists();
如果文件存在，然后以追加模式打开编写器
FileWriter fstream = new FileWriter(file, exists /*=append*/);
并仅在文件尚不存在时才写标头。
if (!exists) {
out.write("File Name;");
...
out.write(System.getProperty("line.separator"));
}
// write new rows
当您使用时，某些事情也会变得更容易PrintWriter：
PrintWriter out;
...
PrintWriter out = new PrintWriter(new BufferedWriter(fstream));
...
out.println(); // easier than out.write(System.getProperty("line.separator"));
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