我想在服务器(将部署.war文件的域)上创建一个.txt文件,并希望它通过下载链接下载。我可以使用user.home在我的PC桌面上创建并保存txt并获取绝对路径。
我使用ServletContext来获取上下文路径。当我尝试在该路径上保存文件时,错误说,java.io.IOException:系统找不到指定的路径。
现在有人可以告诉我该怎么做,这样当我部署.war文件时,我可以编写并下载该文件。
控制器:
@Autowired
ServletContext context;
@RequestMapping(value = "/calculate")
public String getDataQuote(ModelMap map, HttpSession session, @ModelAttribute("dataBean") DataBean dataBean) {
Calculator calc = new Calculator();
Quote quote = calc.calculate(dataBean);
Writer writer = new Writer();
writer.printCloudData(quote, context);
map.addAttribute(quote);
return "result";
}
文件编写者:
public void printData(Bean bean, ServletContext context) {
try {
String path = context.getRealPath("/WebContent/files/");
System.out.println(path);
path = path.replace("\\", "/");
File file = new File(path + "/files", "abc.txt");
if (!file.exists()) {
file.createNewFile();
}
FileWriter fw = new FileWriter(file.getAbsoluteFile());
BufferedWriter bw = new BufferedWriter(fw);
bw.write(bean.a);
bw.newLine();
bw.newLine();
bw.write(bean.b);
bw.close();
} catch (
IOException e)
{
e.printStackTrace();
}
}
每次我运行此控制器时,都会出现此错误:
java.io.IOException: The system cannot find the path specified
at java.io.WinNTFileSystem.createFileExclusively(Native Method)
at java.io.File.createNewFile(Unknown Source)
at com.business.Writer.printQuotationData(Writer.java:32)
at com.controler.DefaultController.getQuote(DefaultController.java:84)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
任何帮助将不胜感激。 感谢。
答案 0 :(得分:2)
您指定的目录在服务器上不存在。所以异常发生了。您可以按如下方式在服务器上写文件:
文件编写者:
public void printData(Bean bean, ServletContext context) {
try {
//if you want to create file outside web-inf directory.
//String path = context.getRealPath("/");
//if you want to create file under web-inf directory.
String path = context.getRealPath("/WEB-INF");
System.out.println(path);
//path = path.replace("\\", "/");
File file = new File(path, "files");
if (!file.exists()) {
file.mkdir();
}
file = new File(file, "abc.txt");
if (!file.exists()) {
file.createNewFile();
}
FileWriter fw = new FileWriter(file.getAbsoluteFile());
BufferedWriter bw = new BufferedWriter(fw);
bw.write(bean.a);
bw.newLine();
bw.newLine();
bw.write(bean.b);
bw.close();
} catch (IOException e){
e.printStackTrace();
}
}