JAVA读取文件和信息写入文件

1:通过BufferedReader,BufferedWriter实验:

//读取XML文件.
File myFile = new File("D:/tmp/to/B10.xml");
BufferedReader br = new BufferedReader(new FileReader(myFile));
StringBuilder sb = new StringBuilder();
String str;
while ((str = br.readLine()) != null)
{
   sb.append(str);
}
br.close();
//发送请求
String returnText = webService.returnReport(sb.toString());
System.out.println("returnText:\n" + returnText);
//写入文件.
File file = new File("D:/tmp/back/B10_back.xml");
BufferedWriter writer = new BufferedWriter(new FileWriter(file));
writer.write(returnText2);
writer.close();