如何压缩多个文件并编码为base64？
如何压缩多个文件并编码为base64？
提问于 2019-06-13 12:17:10
我写了几行代码，工作了一段时间，我创建的程序是这样的。当我压缩.zip格式时，会在目录中形成一个example.zip文件。下一步，程序运行命令在目录中查找.zip文件名。如果找到，它将被转换为base64并作为响应体发送。
我的问题是，如何处理.zip格式？此程序不会在目录中形成文件，但会立即转换为base64 stage，因此目录中不需要example.zip文件。
@Autowired
private FileConvert fileConvert;
@GetMapping("/{formCode}/getZip")
public ResponseEntity<JSONObject> getZipDocument(@PathVariable(value="formCode") String formCode) throws IOException{
try {
List<DocumentImportan> docList = docService.getSelectedFormCode(formCode);
List<Object> listDoc = new ArrayList<>();
HashMap<String, Object> data = new HashMap<>();
String[] dataPdf = new String[docList.size()];
String nameFile = null;
int no = 0;
for(DocumentImportan document : docList) {
String[] arrCode = document.getFormCode().split(",");
String[] arrDesc = document.getFormDesc().split(",");
for(int i = 0; i < arrCode.length; i++) {
if (arrCode[i].equals(formCode)) {
nameFile = arrDesc[i];
}
}
dataPdf[no] = document.getPdfName();
no++;
}
**//process the .zip format method**
String files = fileConvert.zip(dataPdf, nameFile);
**//base64 convert process**
String base64Zip = fileConvert.encodeFile(files);
data.put("zipBase64", base64Zip);
listDoc.add(data);
fileConvert.deleteFileExist(files);
jsonResponse.put(CONST_MSG, "Zip Successful Load");
jsonResponse.put(CONST_STATUS, 200);
jsonResponse.put("data", listDoc);
} catch (Exception e) {
logger.info(String.format(CONST_ERRORMSG, e.getMessage()));
jsonResponse.put(CONST_MSG, e.getMessage());
}
return new ResponseEntity<>(jsonResponse, HttpStatus.OK);
}FileConvert.class
**//method format .zip**
public String zip(String[] data, String nameFile) {
long timeStamp = new Date().getTime();
String zipFile = timeStamp+"_"+nameFile+".zip";
String[] srcFiles = data;
try {
byte[] buffer = new byte[1024];
FileOutputStream fos = new FileOutputStream(context.getEnvironment().getProperty(CONST_FOLDER) + File.separatorChar + zipFile);
ZipOutputStream zos = new ZipOutputStream(fos);
for (int i=0; i < srcFiles.length; i++) {
File srcFile = new File(context.getEnvironment().getProperty(CONST_FOLDER) + File.separatorChar + srcFiles[i]);
FileInputStream fis = new FileInputStream(srcFile);
zos.putNextEntry(new ZipEntry(srcFile.getName()));
int length;
while ((length = fis.read(buffer)) > 0) {
zos.write(buffer, 0, length);
}
zos.closeEntry();
fis.close();
}
zos.close();
}
catch (IOException e) {
logger.error(String.format("Decode file error caused ", e.getMessage()));
}
return zipFile;
}
**//method convert base64**
public String encodeFile(String path) throws IOException {
File file = new File(context.getEnvironment().getProperty(CONST_FOLDER) + File.separatorChar + path);
InputStream is = new FileInputStream(file);
long length = file.length();
byte[] gambar = new byte[(int) length];
int readGambar = is.read(gambar);
if (readGambar > 0) {
byte[] bytes = Base64.encodeBase64(gambar);
is.close();
return new String(bytes);
} else {
return null;
}
}回答 1
Stack Overflow用户
回答已采纳
发布于 2020-11-20 12:00:11
控制器类：
@Autowired
private FileConvert fileConvert;
@GetMapping("/{formCode}/getZip")
public ResponseEntity<JSONObject> getZipDocument(@PathVariable(value = "formCode") String formCode) throws IOException{
try {
List<DocumentImportan> docList = docService.getSelectedFormCode(formCode);
List<Object> listDoc = new ArrayList<>();
HashMap<String, Object> data = new HashMap<>();
String[] dataPdf = new String[docList.size()];
int no = 0;
if (docList.size() > 0) {
for(DocumentImportan document : docList) {
dataPdf[no] = document.getPdfName();
no++;
}
String files = fileConvert.zip(dataPdf);
data.put("zipBase64", files);
}else {
data.put("zipBase64", null);
}
listDoc.add(data);
jsonResponse.put(CONST_MSG, "Zip Successful Load");
jsonResponse.put(CONST_STATUS, 200);
jsonResponse.put("data", listDoc);
} catch (Exception e) {
logger.info(String.format(CONST_ERRORMSG, e.getMessage()));
jsonResponse.put(CONST_MSG, e.getMessage());
}
return new ResponseEntity<>(jsonResponse, HttpStatus.OK);
}FileConvert类：
@Service
public class FileConvert {
private static final String CONST_FOLDER = "image.path";
private static final Logger logger = LoggerFactory.getLogger(FileConvert.class);
@Autowired
private ApplicationContext context;
public String zip(String[] data) throws IOException{
String[] srcFiles = data;
String encodedBase64 = null;
byte[] buffer = new byte[1024];
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ZipOutputStream zos = new ZipOutputStream(baos);
try {
for (int i=0; i < srcFiles.length; i++) {
File srcFile = new File(context.getEnvironment().getProperty(CONST_FOLDER) + File.separatorChar + srcFiles[i]);
try(FileInputStream fis = new FileInputStream(srcFile)){
zos.putNextEntry(new ZipEntry(srcFile.getName()));
int length;
while ((length = fis.read(buffer)) > 0) {
zos.write(buffer, 0, length);
}
zos.closeEntry();
}
}
zos.close();
}
catch (IOException e) {
logger.error("Decode file error caused ");
logger.error(e.getMessage());
}
finally {
zos.close();
}
byte[] bytes = baos.toByteArray();
encodedBase64 = new String(Base64.encodeBase64(bytes));
return encodedBase64;
}
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/56573297
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