1 写导出的话要用 window.location.href="地址"（多个参数用&号分割）不能用ajax请求,因为ajax不能解析二进制的文件
如果window.location.href不生效的话在这句话的地下加window.event.returnValue=false;就好了
2 POI导出：
HSSFWorkbook workbook = new HSSFWorkbook();//创建Excel文件(Workbook)
HSSFSheet sheet = workbook.createSheet();//创建工作表(Sheet)
String[] exportTitleArray = exportTitle.split(",");//得到标题行
HSSFRow row = sheet.createRow(0);
for (int i=0;i<exportTitleArray.length;i++){//创建列并赋值
row.createCell(i).setCellValue(exportTitleArray[i]);
}
String [] sz=exportData.split("-");
for(int i=1;i<=sz.length;i++){
String[] split = sz[i-1].split(",");
HSSFRow row1 = sheet.createRow(i);
for (int j=0;j<split.length;j++){
row1.createCell(j).setCellValue(split[j]);
}
}
response.setContentType("application/ms-excel;charset=UTF-8");
response.setHeader("Content-Disposition","attachment;filename=".concat(String.valueOf(URLEncoder.encode(title,"UTF-8"))));
OutputStream out = response.getOutputStream();
workbook.write(out);// 将数据写出去
out.flush();
out.close();
3 从数据库得图片
Map<String,String> map = new HashMap<>();
FastFileStorageClient storageClient = upLoadingService.getStorageClient();//得到数据库连接地址
map.put("nationalityPicture",null);
map.put("safetyPicture",null);
map.put("seaFishingPicture",null);
map.put("lefts",null);
map.put("rightBoat",null);
map.put("stern",null);
//转换国籍证书图片
String nationalityPicture = ship.getNationalityPicture();//国籍证书图片地址
String npGroupName = nationalityPicture.substring(0,nationalityPicture.indexOf("|"));//得到营业执照名
String npSubstring = nationalityPicture.substring(nationalityPicture.indexOf("|") + 1);//得到|的位置加一
byte[] nbBytes = storageClient.downloadFile(npGroupName,npSubstring);
BASE64Encoder npBase64Encoder = new BASE64Encoder();
map.put("nationalityPicture",npBase64Encoder.encode(nbBytes));
4 用流读取文件一
File file = new File("C:gfs190409.t00z.pgrb2f00");
FileInputStream ins = new FileInputStream(file);
int count = ins.available();
byte[] bytes = new byte[count];
ins.read(bytes);
ins.close();
System.out.println(file.getAbsoluteFile()+"-------"+file.getFreeSpace());
5 使用流读取文件二
FileInputStream fis = new FileInputStream("C:Z_NAFP_C_BCSH_20190409000000_P_high-warms-f00.BIN");
DataInputStream dis = new DataInputStream(fis);
String s="d";
byte[] bytes = new byte[dis.available()];
int i=dis.read(bytes);
String ss=new String(bytes,"UTF-8");
System.out.println("s="+ss+"nlen="+bytes.length+"i"+i);
fis.close();
dis.close();
6 读取.nc文件（.nc.gz文件也可以）
读取.nc.gz文件的时候会自动解压再读取
jar包：netcdfAll-4.6.11.jar
依赖：
方法：
System.out.println("开始");
NetcdfFile openNC = NetcdfFile.open("C:hycom_glb_sfc_u_2019040900_t000.nc");
List<Dimension> dimensions = openNC.getDimensions();//读取纬度信息(得到规模大小)
List<Variable> variables = openNC.getVariables();//读取各个变量
System.out.println("开始循环输出");
for (Variable v:variables) {
System.out.println(v);
}
System.out.println("结束");
7 使用file删除指定文件夹中的内容
File file=new File("E:/test/test2/");
File sz[] =file.listFiles();//得到所有的文件和目录
for(File f:sz){
f里存的是文件的路径和名+后缀
f.delete();//删除对应的文件
}
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8 file删除指定文件夹并创建
File file1 = new File("E:我创建1的");
if(file1.exists()){ System.out.println("存在删除"); file1.delete(); } File file = new File("E:我创建1的"); file.mkdir();//创建文件加
