写入java中的临时文件

public static void writeToFile(String pFilename,StringBuffer sb)
        throws IOException {

    String property = "java.io.tmpdir";


    String tempDir = System.getProperty(property);

    File dir = new File(tempDir);
    File filename = File.createTempFile(pFilename,".tmp",dir);
    FileWriter fileWriter = new FileWriter(filename.getName(),true);
    System.out.println(filename.getName());
    BufferedWriter bw = new BufferedWriter(fileWriter);
    bw.write(sb.toString());
    bw.close();
}