html篇
<!-- 下载文件 --> <div> <a (click)="getFile()">点我测试post方式下载文件</a> </div> <!-- 上传单个文件 --> <div> <input type="file" (change)="uploadFile($event)" name="value" value="测试上传单个文件"/> </div> <!-- 上传多个文件 --> <div > <input type="file" multiple (change)="uploadFiles($event)" name="files" value="测试上传单个文件"/> </div>
组件方法篇
export class PostDownloadComponent implements OnInit {
baseUrl = "http://localhost:8098/";
constructor(private http: Http
) { }
ngOnInit() {
}
// post方式下载文件
getFile() {
let head = new Headers({ 'Content-Type': 'application/json' });
let url = this.baseUrl + "user/exportExcel";
let body = ["343434", "343434", "34342323", "34rty6y654"];
let b = JSON.stringify(body);
let options = new RequestOptions({ headers: head, responseType: 3 });
return this.http.post(url, b, options).toPromise().then(
res => {
let file = new File([res.json()], "mm.xls", { type: "application/vnd.ms-excel" });
var objUrl = URL.createObjectURL(file);
window.open(objUrl);
URL.revokeObjectURL(objUrl)
});
}
// post方式上传单个文件
uploadFile(event) {
let file: FormData = new FormData();
let fileList: FileList = event.target.files;
if (fileList.length > 0) {
let file: File = fileList[0];
let formData: FormData = new FormData();
formData.append('value', file, file.name);
let headers = new Headers();
headers.append('Accept', 'application/json');
let options = new RequestOptions({ headers: headers });
let url = this.baseUrl + "user/importExcel";
this.http.post(url, formData, options).toPromise().then(res => {
console.log(res.json())
})
}
}
// post方式上传多个文件
uploadFiles(event) {
let fileList: FileList = event.target.files;
const fileLength = fileList.length;
const formData: FormData = new FormData();
for (let index = 0; index < fileLength; index++) {
let singleFile = fileList.item(index);
// files 这个名字和spring mvc controller参数的名字要对应
formData.append('files', singleFile);
}
let headers = new Headers();
headers.append('Accept', 'application/json');
let options = new RequestOptions({ headers: headers });
let url = this.baseUrl + "user/importExcelList";
this.http.post(url, formData, options).toPromise().then(res => {
console.log(res.json())
})
}
}
Java后台篇
@Controller
@RequestMapping("user")
public class UserController {
@Autowired
private UserService userService;
@RequestMapping("/selectUser")
public UserVO selectUserById(Long userId) {
return userService.selectUserById(userId);
}
@RequestMapping(value = "/exportExcel", method = RequestMethod.POST)
public void exportExcel(HttpServletRequest request, HttpServletResponse response, @RequestBody String[] str) {
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet sheet = wb.createSheet();
HSSFRow row1 = sheet.createRow(0);
HSSFCell cell = row1.createCell(0);
cell.setCellValue("学院考试成绩一览表");
sheet.addMergedRegion(new CellRangeAddress(0, 0, 0, 3));
List<UserVO> list = new ArrayList<>(10);
for (int i = 0; i < 4; i++) {
UserVO vo = new UserVO();
vo.setEmail("[email protected]");
vo.setPassWord(String.valueOf(i));
vo.setUserName("wgp" + i);
vo.setPhone("110" + i);
list.add(vo);
}
int len = list.size();
HSSFRow ro = sheet.createRow(1);
ro.createCell(0).setCellValue("姓名");
ro.createCell(1).setCellValue("密码");
ro.createCell(2).setCellValue("邮箱");
ro.createCell(3).setCellValue("手机号");
for (int i = 0; i < len; i++) {
HSSFRow ro1 = sheet.createRow(i + 2);
ro1.createCell(0).setCellValue(list.get(i).getUserName());
ro1.createCell(1).setCellValue(list.get(i).getPassWord());
ro1.createCell(2).setCellValue(list.get(i).getEmail());
ro1.createCell(3).setCellValue(list.get(i).getPhone());
}
try {
OutputStream out = response.getOutputStream();
wb.write(out);
response.setHeader("Content-disposition", "attachment; filename=details.xls");
// response.setContentType("application/msexcel");
response.setContentType("application/vnd.ms-excel");
out.close();
} catch (IOException e) {
e.printStackTrace();
}
}
@RequestMapping(value = "/importExcel", method = RequestMethod.POST)
@ResponseBody
public ResultData importExcel(@RequestParam("value") MultipartFile file) {
System.out.println(file.getOriginalFilename());
System.out.println(file.getName());
String fileName = file.getOriginalFilename();
int len = fileName.lastIndexOf(".");
String prefix = fileName.substring(0, fileName.lastIndexOf("."));
String stufix = fileName.substring(len, fileName.length());
OutputStream out = null;
try {
out = new FileOutputStream("D:////" + prefix + System.currentTimeMillis() + ".xls");
out.write(file.getBytes());
out.close();
} catch (Exception e) {
e.printStackTrace();
return new ResultData("1", "fail", false);
}
return new ResultData("0", "successfully", true);
}
@RequestMapping(value="/importExcelList",method = RequestMethod.POST)
@ResponseBody
public ResultData importExcelList(@RequestParam("files") List<MultipartFile> files) {
int length = files.size();
try {
for (int i = 0; i < length; i++) {
String fileName = files.get(i).getOriginalFilename();
int len = fileName.lastIndexOf(".");
String prefix = fileName.substring(0, fileName.lastIndexOf("."));
String stufix = fileName.substring(len, fileName.length());
OutputStream out = null;
out = new FileOutputStream("D://test//" + prefix + System.currentTimeMillis() + stufix);
out.write(files.get(i).getBytes());
out.close();
}
} catch (Exception e) {
e.printStackTrace();
return new ResultData("1", "fail", false);
}
return new ResultData("0", "successfully", true);
}
}
问题篇
前天不要加上 multipart/form-data的header，加上这个纯属画蛇添足。
后台要加上 common-fileuploadjar包。
纯属demo篇
加入项目还需做美化，验证，规范代码等处理。