将文件转成clob添加到Oracle数据库中
2018-08-10 11:16:15来源:博客园 阅读 ()
Controller层:
@Controller
@RequestMapping(value = {"/Test/TestController"})
public class TestController extends BaseController implements ServletContextAware {
private ServletContext servletContext;
@Override
public void setServletContext(ServletContext servletContext) {
this.servletContext = servletContext;
}
/**写入数据的方法
* 添加文件信息
*
* @param file
* @param request
* @return
*/
@RequestMapping(value = {"/testFileAdd.html"}, method = RequestMethod.POST)
public ModelAndView toTestFileAdd(@RequestParam(value = "Files", required = false) MultipartFile file, HttpServletRequest request) {
Map<Object, Object> param = new HashMap<Object, Object>();
String name = file.getOriginalFilename();
InputStream stream = null;
String ioStr = "";
try {
stream = file.getInputStream();
//将流转换成String
byte[] in = new byte[stream.available()];
stream.read(in);
ioStr = HQCodec.hexEncode(in); //调用工具类
} catch (IOException e) {
e.printStackTrace();
} finally {
if (null != stream) {
try {
stream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
param.put("FILE_NAME", name);
param.put("FILES", ioStr);
param.put("ID", 99);
try {
accessService.insert("TestFile.insertFile", param); //调用方法插入
} catch (Exception e) {
e.printStackTrace();
}
return new ModelAndView("sys/user/test");
}
//写出的方法
//跳转到修改文件页面并将文件写到本地E盘中
@RequestMapping("/toEditFiles.html")
public ModelAndView toFiles(Integer id) {
Map<Object, Object> param = new HashMap<Object, Object>();
Map<String, Object> model = new HashMap<String, Object>();
param.put("ID", id);
try {
Map<Object, Object> map = accessService.queryObject("TestFile.select", param);
String file_name = (String) map.get("FILE_NAME");
//写出clob 数据
Clob o = (Clob) map.get("FILES");
Reader stream = o.getCharacterStream();
char[] c = new char[(int) o.length()];
stream.read(c);
String s = new String(c);
stream.close();
byte[] iobyte = HQCodec.hexDecode( s);
File file = new File("E:"+file_name);
OutputStream output = new FileOutputStream(file);
output.write(iobyte);
output.close();
//将查询结果放入模型中
model.put("TestFile", map);
} catch (Exception e) {
e.printStackTrace();
}
return new ModelAndView("sys/user/toEditFiles", model);
}
}
//转换类
public class HQCodec {
static final char[] HEX = new char[] { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E',
'F' };
public static String hexEncode(byte[] buffer) {
if (buffer.length == 0) {
return "";
}
int holder = 0;
char[] chars = new char[buffer.length * 2];
for (int i = 0; i < buffer.length; i++) {
holder = (buffer[i] & 0xf0) >> 4;
chars[i * 2] = HEX[holder];
holder = buffer[i] & 0x0f;
chars[(i * 2) + 1] = HEX[holder];
}
return new String(chars);
}
public static byte[] hexDecode(String hex) {
//A null string returns an empty array
if (hex == null || hex.length() == 0) {
return new byte[0];
} else if (hex.length() < 3) {
return new byte[] { (byte) (Integer.parseInt(hex, 16) & 0xff) };
}
//Adjust accordingly for odd-length strings
int count = hex.length();
int nibble = 0;
if (count % 2 != 0) {
count++;
nibble = 1;
}
byte[] buf = new byte[count / 2];
char c = 0;
int holder = 0;
int pos = 0;
for (int i = 0; i < buf.length; i++) {
for (int z = 0; z < 2 && pos < hex.length(); z++) {
c = hex.charAt(pos++);
if (c >= 'A' && c <= 'F') {
c -= 55;
} else if (c >= '0' && c <= '9') {
c -= 48;
} else if (c >= 'a' && c <= 'f') {
c -= 87;
}
if (nibble == 0) {
holder = c << 4;
} else {
holder |= c;
buf[i] = (byte) holder;
}
nibble = 1 - nibble;
}
}
return buf;
}
}
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