Java基础-实现文件上传_后端

maven:

	commons-fileupload
	commons-fileupload
	1.3.2


	commons-io
	commons-io
	2.5

java后端代码:

import java.io.BufferedReader;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStreamReader;
import java.util.HashMap;
import java.util.Map;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.multipart.MultipartFile;
import net.sf.json.JSONObject;

/**
 * 文件上传工具类
 */
public class UploadFileUtil {
	private static final Logger log = LoggerFactory.getLogger(UploadFileUtil.class);

	/**
	 * 验证文件是否已经存在
	 * @param uploadPath
	 * @param fileName
	 */
	public static String checkFile(String uploadPath,String fileName) {
		Map data = new HashMap();
		boolean result = Boolean.TRUE;
		try {
			String filePath = uploadPath + File.separator + fileName;
			File date = new File(filePath);
			if (date.exists()) {
				data.put("isExists", Boolean.TRUE);
				data.put("fileMsg", "文件已存在!是否覆盖!");
			} else {
				data.put("isExists", Boolean.FALSE);
			}
		} catch (Exception e) {
			log.error(e.getMessage(), e);
			result = Boolean.FALSE;
			data.put("errorMsg", "文件上传失败!");
		}
		data.put("success", result);
		String jsonStr = JSONObject.fromObject(data).toString();
		return jsonStr;
	}

	/**
	 * 文件上传
	 * @param uploadfile
	 * @param request
	 * @param uploadPath
	 * @param fileName
	 */
	public static String uploadFile(MultipartFile uploadfile, String uploadPath,String fileName) {
		Map data = new HashMap();
		boolean result = Boolean.TRUE;
		String uploadFileName = null;
		try {
			InputStreamReader read = new InputStreamReader(uploadfile.getInputStream(), "utf-8");
			BufferedReader bufferedReader = new BufferedReader(read);
			StringBuffer jsonContent = new StringBuffer();
			String content = "";
			while ((content = bufferedReader.readLine()) != null) {
				jsonContent.append(content);
			}
			String filePath = uploadPath + File.separator + fileName;
			File date = new File(filePath);
			FileOutputStream fop = null;
			fop = new FileOutputStream(date);
			byte[] contentInBytes = jsonContent.toString().getBytes();
			fop.write(contentInBytes);
			fop.flush();
			fop.close();
			read.close();
		} catch (Exception e) {
			log.error(e.getMessage(), e);
			result = Boolean.FALSE;
			data.put("errorMsg", "文件上传失败!");
		}
		data.put("success", result);
		data.put("resultMsg", uploadFileName + "上传成功!");
		String jsonStr = JSONObject.fromObject(data).toString();
		return jsonStr;
	}
}