java 文件上传到读取文件内容的实例

public String uploadFile() throws Exception {logger.info("开始导入规则文件：" + fileInputFileName);InputStream is = new FileInputStream(fileInput);String uploadPath = ServletActionContext.getServletContext().getRealPath("/upload");System.out.println(uploadPath);File targetFile = new File(uploadPath, this.getFileInputFileName());OutputStream os = new FileOutputStream(targetFile);byte[] buffer = new byte[1024];int length = 0;while ((length = is.read(buffer)) > 0) {os.write(buffer, 0, length);}is.close();os.close();Map<String, Object> map = personalKPIMonitorManualRuleService.importRules(targetFile);HttpServletResponse response = ServletActionContext.getResponse();response.setContentType("text/html;charset=utf-8");PrintWriter out = response.getWriter();out.println(JSONObject.fromObject(map));// if(flag==true){// logger.info("规则文件导入成功："+fileInputFileName);// out.println("规则文件导入成功："+fileInputFileName);// }else{// logger.info("规则文件导入失败："+fileInputFileName);// out.println("规则文件导入失败，详见日志："+fileInputFileName);// }out.flush();out.close();return null;}