servlet 中out.println 输出拼接字符串

本文探讨了两种不同的字符串拼接方式,一种是在HTML标签中插入变量,另一种是在JavaScript函数内使用变量进行URL构造。通过具体代码示例展示了如何在网页开发中有效利用字符串拼接来动态生成内容。

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一定要注意引号是成对的出的字的出现

字符串的拼接问题

拼接一:

out.println("<div><a href='merchandise_List'>Name"+i+"</a><input type='button' onclick='addNum("+i+")' /></div>");

拼接二:

out.println("function addNum(iid){");

out.println(" ocation.href='merchandise_List?id=' + iid + '&' + Math.random();");

out.println("}");

//校验文件是否已经导入过 /* String checkFileName "select count(*) from LDTraceImport where inFileName='"+FileName+"' AND inFType='Customer'AND inSType='BlackList'"; ExeSQL tExeSQL = new ExeSQL(); SSRS tSSRS = new SSRS(); tSSRS = tExeSQL.execSQL (checkFileName) ; int result = Integer.parseInt (tSSRS.GetText (1, 1)); System.out.println("result: "+result); */ File uploadpath = new File(ImportPath); if (!uploadpath.exists()) uploadpath.mkdirs(); //保存上传的文件到指定的目录 try { //创建 目标文件对象,将上传文件写入目标位置 item.write(new File(ImportPath + FileName)); count =1; catch (Exception e) System.out.println("upload file error ..."+ e.getMessage()); //输出参数 String tRela String Result = String Result1 = TransferData tTransferData = new TransferData(); boolean res = true; CustomerRecordChkResBl tBL = new CustomerRecordChkResBl (); if (count > 0) { GlobalInput tG = new GlobalInput(); tG = (GlobalInput) session.getValue("GI"); // 准备传输数据 VData VData tVData = new VData(); FlagStr = tTransferData.setNameAndValue ("FileName", ImportPath+ FileName) ; tTransferData.setNameAndValue ("inFType", "Customer"); tTransferData.setNameAndValue ("serNo", aSerNo);//理赔定点医院 tVData. add(tTransferData); tVData.add(tG); try { res = tBL.submitData(tVData); succNum=tBL.getSuccNum(); errNum=tBL.getErrNum(); catch (Exception ex) Content = ”处理失败,原因是:"+ ex.toString(); FlagStr ="Fail"; 于 else l Content="上载文件失败!”; FlagStr ="Fail"; String errMess = ""; if (res) ( System.out.println(" Susseus...") ; //Content=”导入完成!”; FlagStr = "Succ"; if (tBL.getMsg() != null && !"".equals(tBL.getMsg())) Content = (String) tBL.getMsg(); else [ System.out.println(” Fail..."); if (tBL.getMsg() != null && !"".equals(tBL.getMsg())) ( Content =(String) tBL.getMsg(); FlagStr ="Fail"; actFileName = tBL.getFileName () ; System.out.println(" FlagStr..." + FlagStr); System.out.println(" Content..." + Content); System.out. println(" Result..."+ Result); System.out.println(" FileName..." + FileName); 结合上一个问题里面的代码,给代码添加注释,如果调用方法,请解释一下,谢谢
03-08
import javax.servlet.ServletException; import javax.servlet.annotation.MultipartConfig; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.Part; import java.io.File; import java.io.IOException; import java.io.PrintWriter; import java.util.Arrays; import java.util.Collection; import java.util.stream.Collectors; @MultipartConfig @WebServlet("/ABCServlet") public class ABCServlet extends HttpServlet { @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { // super.doGet(req, resp); } @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { // super.doPost(req, resp); req.setCharacterEncoding("utf-8"); String name = req.getParameter("name"); String[] hobbies = req.getParameterValues("hobby"); resp.setContentType("text/html;charset=utf-8"); PrintWriter writer = resp.getWriter(); writer.println("name: " + name + "<br>"); writer.println("hobbies: " + Arrays.toString(hobbies)); String uploadDir = "/upload/"; String uploadPath = req.getServletContext().getRealPath(uploadDir); File uploadFile = new File(uploadPath); if (!uploadFile.exists()) { uploadFile.mkdirs(); } Part singlePart = req.getPart("avatar"); String singleFileName = ""; //确保单文件上传框中,选择了文件 if (singlePart != null) { singleFileName = singlePart.getSubmittedFileName(); singleFileName = singlePart.getName(); if (singleFileName != null && !"".equals(singleFileName)) { System.out.println("单个上传的文件是:" + singleFileName); singlePart.write(uploadPath + singleFileName); singlePart.delete();
03-26
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