提问人：Roy503 提问时间：11/9/2023 更新时间：11/9/2023 访问量：26
将 Servlet 代码更改为 Spring Boot 框架
Change Servlet code into Spring Boot framework
问：
我目前有一个apache tomcat服务器，它使用servlet以表格格式显示.csv数据，这不是很复杂。 我想尝试将我当前的设置转换为Spring Boot，作为学习Spring Boot的一种方式。
我当前的代码获取存储文件的目录并创建文件列表，然后使用 CSVReader 读取每个 csv 文件。
从本质上讲，我想从文件中读入数据并将其显示在表中。目前使用 .csv，但很乐意更改格式。
如果不创建一个与我以前的 servlet 类似的 servlet，我就无法理解一种做到这一点的方法。谁能为我指出正确的方向？我不认为我的原始设计也有分层逻辑，可能需要重新设计才能与这个框架一起使用。
import java.io.IOException;
import java.io.PrintWriter;
import java.io.FileReader;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.Collections;
import java.util.Arrays;
import java.io.File;
import java.time.LocalDate;
import com.opencsv.CSVReader;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet implementation class TonerLevels
*/
@WebServlet(urlPatterns = {"/TonerLevels", "/"})
public class TonerLevels extends HttpServlet {
private static final long serialVersionUID = 1L;
public void init() throws ServletException {
// Do required initialization
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
//response.getWriter().append("Served at: ").append(request.getContextPath());
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("<script type=\"text/javascript\" src=\"/js/bootstrap.bundle.js\"></script>\n");
out.println("<link rel=\"stylesheet\" type=\"text/css\" href=\"/css/bootstrap.css\"></link>\n");
out.println("<link rel=\"stylesheet\" type=\"text/css\" href=\"/css/style.css\"></link>\n");
out.println("<script type=\"text/javascript\" src=\"/js/script.js\"></script>\n");
File[] fileList = fileList();
String title = "KHS Printers";
String docType =
"<!doctype html public \"-//w3c//dtd html 4.0 " + "transitional//en\">\n";
String nav = "<nav data-bs-theme=\"dark\" class=\"navbar navbar-expand-lg bg-body-tertiary\">\r\n"+
" <div class=\"container-fluid\">\r\n"+
" <a class=\"navbar-brand\" >KHS Printers</a>\r\n"+
" <button class=\"navbar-toggler\" type=\"button\" data-bs-toggle=\"collapse\" data-bs-target=\"#navbarSupportedContent\" aria-controls=\"navbarSupportedContent\" aria-expanded=\"false\" aria-label=\"Toggle navigation\">\r\n"+
" <span class=\"navbar-toggler-icon\"></span>\r\n"+
" </button>\r\n"+
" <div class=\"collapse navbar-collapse\" id=\"navbarSupportedContent\">\r\n"+
" <ul class=\"navbar-nav nav-pills me-auto mb-2 mb-lg-0\">\r\n"+
" <li class=\"nav-item\">\r\n"+
" <a class=\"nav-link active\" aria-current=\"page\" href=\"/TonerLevels\">Toner Levels</a>\r\n"+
" </li>\r\n"+
" <li class=\"nav-item\">\r\n"+
" <a class=\"nav-link\" href=\"/MonoPrints\">Mono Prints</a>\r\n"+
" </li>\r\n"+
" <li class=\"nav-item\">\r\n"+
" <a class=\"nav-link\" href=\"/MonoCopies\">Mono Copies</a>\r\n"+
" </li>\r\n"+
" <li class=\"nav-item\">\r\n"+
" <a class=\"nav-link\" href=\"/ColourPrints\">Colour Prints</a>\r\n"+
" </li>\r\n"+
" <li class=\"nav-item\">\r\n"+
" <a class=\"nav-link\" href=\"/ColourCopies\">Colour Copies</a>\r\n"+
" </li>\r\n"+
" <li class=\"nav-item dropdown\">\r\n"+
" <a class=\"nav-link dropdown-toggle\" data-bs-toggle=\"dropdown\" href=\"#\" role=\"button\" aria-expanded=\"false\">Monthly Reports</a>\r\n"+
" <ul class=\"dropdown-menu\">\r\n"+
" <form action=\"Monthly\" method=\"post\">\r\n";
if(fileList.length > 0){
for(int i = 0; i < fileList.length; i++){
String name = fileList[i].getName();
LocalDate date = LocalDate.parse(name.substring(0,name.length()-4));
String month = date.getMonth().minus(1).toString();
String year = Integer.toString(date.getYear());
nav+="<li><button type=\"submit\" class=\"dropdown-item\" name=\"report\" value=\""+name+"\" href=\"/Monthly\">"+month+" "+year+"</button></li>\r\n";
}
}
nav+=""+
" </form>\r\n"+
" </ul>\r\n"+
" </li>\r\n"+
" </ul>\r\n"+
" </div>\r\n"+
" </div>\r\n"+
"</nav>\r\n";
String path = this.getClass().getClassLoader().getResource(".").getPath();
path = path.replaceAll("%20", " ");
try {
FileReader filereader = new FileReader(path+"printers/printers.csv");
CSVReader csvReader = new CSVReader(filereader);
String[] nextRecord;
out.println(docType +
"<html>\n" +
"<head><title>" + title + "</title>\n" +
"</head>\n" +
"<body onload=\"sortTable()\">\n" +
nav +
"<table class=\"table table-dark table-hover\">\n");
int i = 0;
String regex = "^((25[0-5]|(2[0-4]|1\\d|[1-9]|)\\d)\\.?\\b){4}$";
Pattern pattern = Pattern.compile(regex);
while ((nextRecord = csvReader.readNext()) != null) {
if (i==0){
out.println("<thead>\n");
out.println("<tr>\n");
for (String cell : nextRecord) {
if("Black".equals(cell) || "Yellow".equals(cell) || "Magenta".equals(cell) || "Cyan".equals(cell) || "K1".equals(cell) || "K2".equals(cell)){
out.println("<th>" + cell + " %</th>\n");
}
else{
out.println("<th>" + cell + "</th>\n");
}
}
out.println();
out.println("</tr>\n");
out.println("</thead>\n");
out.println("<tbody class=\"table-group-divider\">\n");
}
else{
out.println("<tr>\n");
for (String cell : nextRecord) {
Matcher matcher = pattern.matcher(cell);
if(matcher.matches()){
out.println("<td><a href=\"http://"+cell+"\"target=\"_blank\" rel=\"noopener noreferrer\">"+ cell +"</a></td>\n");
}
else if(cell.matches("-?(0|[1-9]\\d*)")){
out.println("<td>" + Integer.parseInt(cell) + "</td>\n");
}
else {
out.println("<td>" + cell + "</td>\n");
}
}
out.println();
out.println("</tr>\n");
}
i++;
}
out.println("</tbody>\n");
out.println("</table>\n" +
"</body>\n" +
"</html>\n"
);
}
catch (Exception e) {
e.printStackTrace();
}
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}
private File[] fileList(){
//get list of files in /printers/reports
File catalinaBase = new File( System.getProperty( "catalina.base" ) ).getAbsoluteFile();
File f = new File( catalinaBase, "/webapps/ROOT/WEB-INF/classes/printers/reports");
File[] fileList = new File[0];
if(f.isDirectory()) {
fileList = f.listFiles();
if(fileList.length > 0) {
Arrays.sort(fileList, Collections.reverseOrder());
}
}
return fileList;
}
}
答：
0赞
Roy503
12/1/2023
#1
我最终将我的打印机数据保存为 json 并使用 spring boot / react。 我采取的步骤：
- 使用 jackson 将 json 反序列化为 Printer 对象列表（我制作的打印机类）
- 将打印机对象列表用于 rest api（Spring Boot 的内置功能）
- 在 react 中使用 axios 获取 api（包含我的打印机的 json）并将它们映射到 react 中的 Printer 类型
- 在 react 中使用 JSX 和 html 通过引导程序格式化网站
因此，从本质上讲，spring boot会完成所有工作，并公开我想通过api显示的内容，然后react将显示数据。
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