java Web常用基本操作代码
1.Struts2中文件保存
//设置文件的三个属性，并且提供set方法 (此处省略)private File newsAttach;private String newsAttachFileName;private String newsAttachContentType;if (newsAttach != null) {// 附件非空String rp = request.getSession().getServletContext().getRealPath("/");String midPath = "uploadsrc/file/" + System.currentTimeMillis();String realPath = rp.replaceAll("\\\", "/") + midPath + "/";FileUtil.savePic(realPath, getNewsAttachFileName(), newsAttach);}String act= request.getParameter("act");if (act.equals("downFile")) {// 下载文件String path = request.getParameter("path");String rp = request.getSession().getServletContext().getRealPath("/");rp = rp.substring(0, rp.length() - 1);File picFile = new File(rp + path);if (picFile != null && picFile.exists()) {response.setContentType("application/octet-stream; charset=UTF-8");try {response.setHeader("Content-Disposition","attachment;filename="+ java.net.URLEncoder.encode(picFile.getName(), "UTF-8") + "");OutputStream out = response.getOutputStream();//需要导入apache的commons.io.jar包org.apache.commons.io.FileUtils.readFileToByteArray(picFile);out.write(FileUtils.readFileToByteArray(picFile));response.flushBuffer();out.flush();out.close();} catch (Exception e) {e.printStackTrace();}}return null;}if (act.equals("delFile")) {//删除文件String ret = "";String path = request.getParameter("path");String realRoot = request.getSession().getServletContext().getRealPath("/");realRoot = realRoot.substring(0, realRoot.length() - 1);boolean flag = FileUtil.delFile(realRoot+path);if (flag) {ret = "OK";}try {response.getWriter().write(ret);} catch (IOException e) {e.printStackTrace();}return null;}import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.util.List;public class FileUtil {//保存多个文件(需考虑文件名)public static void saveFile(String RootPath,List<File> file,List<String> fileFileName) throws Exception{if (file != null) {int i = 0;for (; i < file.size(); i++) {java.io.InputStream is = new java.io.FileInputStream(file.get(i));java.io.OutputStream os = new java.io.FileOutputStream(RootPath + fileFileName.get(i));byte buffer[] = new byte[8192];int count = 0;while ((count = is.read(buffer)) > 0) {os.write(buffer, 0, count);}os.close();is.close();}}}// 保存文件public static void savePic(String newsRootPath, String filename, File picFile) {try {File newsFileRoot = new File(newsRootPath);if (!newsFileRoot.exists()) {newsFileRoot.mkdirs();}FileOutputStream fos = new FileOutputStream(newsRootPath + filename);FileInputStream fis = new FileInputStream(picFile);byte[] buf = new byte[1024];int len = 0;while ((len = fis.read(buf)) > 0) {fos.write(buf, 0, len);}if (fis != null)fis.close();if (fos != null)fos.close();} catch (Exception ex) {ex.printStackTrace();}}// 删除文件public static boolean delFile(String fpath) {boolean flag = false;File filePath = new File(fpath);if (filePath.exists()) {filePath.delete(); // 删除已有的附件flag = true;}return flag;}}