java是否可以在tomcat中编辑类文件并重新编译单个文件？
我手头有一个由tomcat编写的考试系统，现在，我发现程序中有一个bug，我没有源代码，但我使用JDGUI反编译它，我想做什么 很简单，只需替换这行代码
ResultSet rs = conn.createStatement().executeQuery("select id FROM EXAMINEE ");
与
ResultSet rs = st.executeQuery("select id FROM EXAMINEE ");
我该怎么做呢，我想编译这首单曲 java文件到类中，我尝试了javac，但错误太多， 下面是我要修改的反编译文件
package maozf.admin;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.HashMap;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import maozf.Databases;
import maozf.ExamPaper;
import maozf.Examinee;
import maozf.Officer;
@WebServlet({"/admin/adminExaminee.jsp"})
public class AdminExaminee
extends HttpServlet
{
private static final long serialVersionUID = 1L;
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException
{
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
try
{
HttpSession session = request.getSession();
ServletContext application = request.getSession().getServletContext();
Officer officer = (Officer)session.getAttribute("admin");
if (officer == null) {
response.sendRedirect("index.jsp");
}
String oper = request.getParameter("oper");
String name = request.getParameter("name");
String idcard = request.getParameter("idcard");
String duty = request.getParameter("duty");
String dept = request.getParameter("dept");
String area = request.getParameter("area");
String papertypeid = request.getParameter("papertypeid");
String id = request.getParameter("id");
int paperid = 0;
if (oper == null) {
oper = "";
}
if (name != null) {
name = new String(name.getBytes("ISO-8859-1"), "utf-8").trim();
}
if (idcard != null) {
idcard = new String(idcard.getBytes("ISO-8859-1"), "utf-8").trim();
}
if (duty != null) {
duty = new String(duty.getBytes("ISO-8859-1"), "utf-8").trim();
}
if (dept != null) {
dept = new String(dept.getBytes("ISO-8859-1"), "utf-8").trim();
}
if (dept != null) {
area = new String(area.getBytes("ISO-8859-1"), "utf-8").trim();
}
if (papertypeid != null) {
paperid = Integer.valueOf(papertypeid).intValue();
}
id = request.getParameter("id");
Connection conn = (Connection)application.getAttribute("connect");
if (conn == null)
{
conn = new Databases().getConn();
application.setAttribute("connect", conn);
}
Statement st = conn.createStatement();
String sqlsString = "";
if (oper.equals("change"))
{
Examinee examinee = new Examinee(id, name, idcard, area, dept, paperid, duty);
examinee.save(conn);
}
else if (oper.equals("bacthChange"))
{
String where = " where true ";
where = where + (area.equals("%") ? "" : new StringBuilder(" and area='").append(area).append("' ").toString());
where = where + (dept.equals("%") ? "" : new StringBuilder(" and dept='").append(dept).append("' ").toString());
where = where + (duty.equals("%") ? "" : new StringBuilder(" and duty='").append(duty).append("' ").toString());
ResultSet rs = st.executeQuery("select id FROM EXAMINEE " + where);
while (rs.next())
{
Examinee examinee = Examinee.LoadExaminee(rs.getString(1), conn);
examinee.setPaperTypeId(paperid);
examinee.save(conn);
}
}
else if (oper.equals("batchReset"))
{
ResultSet rs = conn.createStatement().executeQuery("select id FROM EXAMINEE ");
while (rs.next())
{
Examinee examinee = Examinee.LoadExaminee(rs.getString(1), conn);
examinee.setExamPaper(ExamPaper.loadMe(examinee, conn));
examinee.save(conn);
}
}
else if (oper.equals("del"))
{
st.execute("delete EXAMINEE where id='" + id + "'");
}
else if (oper.equals("bacthDel"))
{
String where = " where true ";
where = where + (area.equals("%") ? "" : new StringBuilder(" and area='").append(area).append("' ").toString());
where = where + (dept.equals("%") ? "" : new StringBuilder(" and dept='").append(dept).append("' ").toString());
where = where + (duty.equals("%") ? "" : new StringBuilder(" and duty='").append(duty).append("' ").toString());
sqlsString = "delete from EXAMINEE" + where;
st.executeUpdate(sqlsString);
}
else if (oper.equals("add"))
{
Examinee examinee = new Examinee(id, name, idcard, area, dept, paperid, duty);
examinee.save(conn);
}
else if (oper.equals("resetPaper"))
{
Examinee examinee = Examinee.LoadExaminee(id, conn);
examinee.setExamPaper(ExamPaper.loadMe(examinee, conn));
examinee.save(conn);
HashMap<String, ExamPaper> paperMap = (HashMap)application
.getAttribute("paperMap");
if (paperMap != null) {
paperMap.put(examinee.getId(), examinee.getExamPaper());
}
}
String pageString = request.getParameter("page");
String search = request.getParameter("search");
String field = request.getParameter("field");
String sql = "";String countsql = "";
int pages = 0;int pageCount = 0;
ResultSet rs = null;
if (pageString != null)
{
pages = Integer.valueOf(pageString).intValue();
sql = (String)session.getAttribute("sql");
pageCount = ((Integer)session.getAttribute("pagecount")).intValue();
}
else
{
if ((field != null) && (search != null) && (search.length() > 0))
{
search = new String(search.getBytes("ISO-8859-1"), "utf-8").trim().replaceAll("'", "");
sql = "select a.* ,b.papertypename from EXAMINEE a left join exampapertype b on a.papertypeid=b.id where " +
field + " like '%" + search + "%' order by a.papertypeid";
countsql = "select count(1) from EXAMINEE where name like '%" + search + "%'";
}
else
{
sql = "select a.* ,b.papertypename from EXAMINEE a left join exampapertype b on a.papertypeid=b.id order by a.papertypeid";
countsql = "select count(1) from EXAMINEE";
}
rs = st.executeQuery(countsql);
rs.next();
pageCount = rs.getInt(1) / 10;
session.setAttribute("sql", sql);
session.setAttribute("pagecount", Integer.valueOf(pageCount));
}
st.execute(sql + " limit 10 offset 10*" + pageString);
rs = st.getResultSet();
RequestDispatcher dispatcher = request.getRequestDispatcher("head.jsp");
dispatcher.include(request, response);
out.write("\r\n");
out.write("<script type=\"text/javascript\">\n");
out.write("<!--\n");
out.write("\tfunction isSubmit(){\r\n");
out.write("\t\tif(confirm(\"确定要重置所有考生的试卷吗?\"))\r\n");
out.write("\t\t\tlocation.href=\"adminExaminee.jsp?oper=batchReset\";\r\n");
out.write("}\n");
out.write("//-->\n");
out.write("</script>\r\n");
out.write("<div style=\"margin: 0 20px 20px 20px\">\r\n");
out.write("<div class=block block-user id=block-user-0>\r\n");
out.write("<h2><span class=w1><span class=w2>考生信息</span></span></h2>\r\n");
out.write("<div class=content>\r\n");
out.write("<div style=\"margin-top: 5px\" align=right>\r\n");
out.write("<form action=adminExaminee.jsp method=post\r\n");
out.write("\tstyle=\"margin: 0px; display: inline\" align=left><select\r\n");
out.write("\tname=field>\r\n");
out.write("\t<option value=\"name\" selected>按姓名</option>\r\n");
out.write("\t<option value=\"dept\">按部门</option>\r\n");
out.write("\t<option value=\"area\">按单位</option>\r\n");
out.write("\t<option value=\"duty\">按职能</option>\r\n");
out.write("</select>:<input type=text name=search><input type=image\r\n");
out.write("\tsrc=\"../images/search.png\" alt=查找></form>\r\n");
out.write(" <input type=\"image\"\r\n");
out.write("\tonfocus=\"this.blur()\" unselectable=\"on\"\r\n");
out.write("\tstyle=\"margin: 0px; padding: 0px\" alt=\"首页\" src=\"../images/first.png\"\r\n");
out.write("\tonclick=\"location.href='adminExaminee.jsp?page=");
out.print(0);
out.write("'\"\r\n");
out.write("\t");
out.print(pages == 0 ? "DISABLED" : "");
out.write("> <input type=\"image\"\r\n");
out.write("\tonfocus=\"this.blur()\" unselectable=\"on\"\r\n");
out.write("\tstyle=\"margin: 0px; padding: 0px\" alt=\"上一页\"\r\n");
out.write("\tsrc=\"../images/previoupage.png\"\r\n");
out.write("\tonclick=\"location.href='adminExaminee.jsp?page=");
out.print(pages - 1);
out.write("'\"\r\n");
out.write("\t");
out.print(pages == 0 ? "DISABLED" : "");
out.write("> <input type=\"image\"\r\n");
out.write("\tonfocus=\"this.blur()\" unselectable=\"on\"\r\n");
out.write("\tstyle=\"margin: 0px; padding: 0px\" alt=\"下一页\"\r\n");
out.write("\tsrc=\"../images/nextpage.png\"\r\n");
out.write("\tonclick=\"location.href='adminExaminee.jsp?page=");
out.print(pages + 1);
out.write("'\"\r\n");
out.write("\t");
out.print(pages == pageCount ? "DISABLED" : "");
out.write("> <input\r\n");
out.write("\ttype=\"image\" onfocus=\"this.blur()\" unselectable=\"on\"\r\n");
out.write("\tstyle=\"margin: 0px; padding: 0px\" alt=\"末页\" src=\"../images/end.png\"\r\n");
out.write("\tonclick=\"location.href='adminExaminee.jsp?page=");
out.print(pageCount);
out.write("'\"\r\n");
out.write("\t");
out.print(pages == pageCount ? "DISABLED" : "");
out.write("></div>\r\n");
out.write("<table CELLSPACING=0 class=admin width=100%>\r\n");
out.write("\t<TR>\r\n");
out.write("\t\t<th>考生编号</th>\r\n");
out.write("\t\t<th>考生姓名</th>\r\n");
out.write("\t\t<th>身份证</th>\r\n");
out.write("\t\t<th>地区</th>\r\n");
out.write("\t\t<th>部门</th>\r\n");
out.write("\t\t<th>职务</th>\r\n");
out.write("\t\t<th>试卷名称</th>\r\n");
out.write("\t\t<th>试卷状态</th>\r\n");
out.write("\t\t<th colspan=3>操作</th>\r\n");
out.write("\t</TR>\r\n");
out.write("\t");
while (rs.next())
{
InputStream a = rs.getBinaryStream("exampaper");
ExamPaper examPaper = null;
if (a != null) {
try
{
examPaper = (ExamPaper)new ObjectInputStream(a).readObject();
}
catch (Exception localException1) {}
}
out.write("<tr><td>" +
rs.getString("ID") +
"</td><td>" +
rs.getString("NAME") +
"</td><td>" +
rs.getString("IDCARD") +
"</td><td>" +
rs.getString("AREA") +
"</td><td>" +
rs.getString("DEPT") +
"</td><td>" +
rs.getString("duty") +
"</td><td>" +
rs.getString("papertypename") +
"</td><td>" + (
examPaper.getStartTime() == 0L ? "未测试" : examPaper.isEnd() ? "成绩:" + examPaper.getScoring() : examPaper == null ? "未生成试卷" : "正在测试中") +
"</td><td><a href=adminExaminee.jsp?oper=resetPaper&id=" + rs.getString("ID") +
">重置试卷</a></td><td><a href=adminExaminee.jsp?oper=changeShow&id=" + rs.getString("ID") +
"#add>修改</a></td><td><a href=adminExaminee.jsp?oper=del&id=" + rs.getString("ID") +
">删除</a></td></tr>");
}
out.write("\r\n");
out.write("</table>\r\n");
out.write("<div style=\"margin-top: 5px\" align=right><input type=\"image\"\r\n");
out.write("\tonfocus=\"this.blur()\" unselectable=\"on\"\r\n");
out.write("\tstyle=\"margin: 0px; padding: 0px\" alt=\"首页\" src=\"../images/first.png\"\r\n");
out.write("\tonclick=\"location.href='adminExaminee.jsp?page=");
out.print(0);
out.write("'\"\r\n");
out.write("\t");
out.print(pages == 0 ? "DISABLED" : "");
out.write("> <input type=\"image\"\r\n");
out.write("\tonfocus=\"this.blur()\" unselectable=\"on\"\r\n");
out.write("\tstyle=\"margin: 0px; padding: 0px\" alt=\"上一页\"\r\n");
out.write("\tsrc=\"../images/previoupage.png\"\r\n");
out.write("\tonclick=\"location.href='adminExaminee.jsp?page=");
out.print(pages - 1);
out.write("'\"\r\n");
out.write("\t");
out.print(pages == 0 ? "DISABLED" : "");
out.write("> <input type=\"image\"\r\n");
out.write("\tonfocus=\"this.blur()\" unselectable=\"on\"\r\n");
out.write("\tstyle=\"margin: 0px; padding: 0px\" alt=\"下一页\"\r\n");
out.write("\tsrc=\"../images/nextpage.png\"\r\n");
out.write("\tonclick=\"location.href='adminExaminee.jsp?page=");
out.print(pages + 1);
out.write("'\"\r\n");
out.write("\t");
out.print(pages == pageCount ? "DISABLED" : "");
out.write("> <input\r\n");
out.write("\ttype=\"image\" onfocus=\"this.blur()\" unselectable=\"on\"\r\n");
out.write("\tstyle=\"margin: 0px; padding: 0px\" alt=\"末页\" src=\"../images/end.png\"\r\n");
out.write("\tonclick=\"location.href='adminExaminee.jsp?page=");
out.print(pageCount);
out.write("'\"\r\n");
out.write("\t");
out.print(pages == pageCount ? "DISABLED" : "");
out.write("></div>\r\n");
out.write("<div><input type=button onclick=\"isSubmit()\" value=\"所有人员试卷重置\">\r\n");
out.write("</div>\r\n");
out.write("</div>\r\n");
out.write("</div>\r\n");
out.write("<hr>\r\n");
out.write("<a name=\"add\">\r\n");
out.write("<div class=block block-user id=block-user-0>\r\n");
out.write("<h2><span class=w1><span class=w2> ");
if (oper.equals("changeShow"))
{
out.write("修改考生信息<button onclick='location.href=\"adminExaminee.jsp#add\"'>切换为新增</button>");
st.execute("select * from EXAMINEE where ID='" + id + "' order by papertypeid");
rs = st.getResultSet();
if (rs.next())
{
name = rs.getString("NAME");
idcard = rs.getString("IDCARD");
area = rs.getString("AREA");
dept = rs.getString("DEPT");
duty = rs.getString("duty");
paperid = rs.getInt("papertypeid");
}
}
else
{
out.write("添加考生信息");
}
out.write(" </span></span></h2>\r\n");
out.write("<div class=content>\r\n");
out.write("<form class=admin action=adminExaminee.jsp method=\"post\"\r\n");
out.write("\tonsubmit=\"return checkForm();\">\r\n");
out.write("<table>\r\n");
out.write("\t<tr>\r\n");
out.write("\t\t<td>考生编号:</td>\r\n");
out.write("\t\t<td><input type=text id=\"id\" name=id\r\n");
out.write("\t\t\t");
out.print(oper.equals("changeShow") ? "value=" + id + " readonly" : "");
out.write(" /></td>\r\n");
out.write("\t</tr>\r\n");
out.write("\t<tr>\r\n");
out.write("\t\t<td>考生姓名:</td>\r\n");
out.write("\t\t<td><input type=text id=\"name\" name=name\r\n");
out.write("\t\t\t");
out.print(oper.equals("changeShow") ? "value=" + name : "");
out.write(" /></td>\r\n");
out.write("\t</tr>\r\n");
out.write("\t<tr>\r\n");
out.write("\t\t<td>身 份 证:</td>\r\n");
out.write("\t\t<td><input type=text id=idcard name=idcard\r\n");
out.write("\t\t\t");
out.print(oper.equals("changeShow") ? "value=" + idcard : "");
out.write(" /></td>\r\n");
out.write("\t</tr>\r\n");
out.write("\t<tr>\r\n");
out.write("\t\t<td>所在地区:</td>\r\n");
out.write("\t\t<td><input type=text id=dept name=area\r\n");
out.write("\t\t\t");
out.print(oper.equals("changeShow") ? "value=" + area : "");
out.write(" /></td>\r\n");
out.write("\t</tr>\r\n");
out.write("\t<tr>\r\n");
out.write("\t\t<td>所在部门:</td>\r\n");
out.write("\t\t<td><input type=text id=dept name=dept\r\n");
out.write("\t\t\t");
out.print(oper.equals("changeShow") ? "value=" + dept : "");
out.write(" /></td>\r\n");
out.write("\t</tr>\r\n");
out.write("\t<tr>\r\n");
out.write("\t\t<td>职 务:</td>\r\n");
out.write("\t\t<td><input type=text id=duty name=duty\r\n");
out.write("\t\t\t");
out.print(oper.equals("changeShow") ? "value=" + duty : "");
out.write(" /></td>\r\n");
out.write("\t</tr>\r\n");
out.write("\t<tr>\r\n");
out.write("\t\t<td>试卷类型:</td>\r\n");
out.write("\t\t<td><select name=papertypeid>\r\n");
out.write("\t\t\t");
st.execute("select id,papertypename from exampapertype");
rs = st.getResultSet();
while (rs.next())
{
String seleted = "";
if (rs.getInt(1) == Integer.valueOf(paperid).intValue()) {
seleted = "seleted";
}
out.write("<option value=\"" + rs.getInt(1) + "\" " + seleted + ">" + rs.getString(2) + "</option>)");
}
out.write("\r\n");
out.write("\t\t</select></td>\r\n");
out.write("\t</tr>\r\n");
out.write("\t<tr>\r\n");
out.write("\t\t<td colspan=2 align=center><input type=hidden name=oper\r\n");
out.write("\t\t\tvalue='");
out.print(oper.equals("changeShow") ? "change" : "add");
out.write("' /> <input\r\n");
out.write("\t\t\ttype=submit value=\"确定 [O]\" / accesskey=\"o\"></td>\r\n");
out.write("\t\t</td>\r\n");
out.write("\t</tr>\r\n");
out.write("</table>\r\n");
out.write("</form>\r\n");
out.write("</div>\r\n");
out.write("</div>\r\n");
out.write("<hr>\r\n");
out.write("<a name=\"bacthAdd\"></a>\r\n");
out.write("<div class=block block-user id=block-user-0>\r\n");
out.write("<h2><span class=w1><span class=w2>批量导入</span></span></h2>\r\n");
out.write("<div class=content>\r\n");
out.write("<form action=\"bacthAddExaminee\" id=BacthAddExaminee\r\n");
out.write("\tenctype=\"multipart/form-data\" method=\"post\"\r\n");
out.write("\tonsubmit=\"return checkUpload();\"><input type=hidden name=oper\r\n");
out.write("\tvalue='bacthAdd'> EXCEL文件:<input type=\"file\" name=\"file\"\r\n");
out.write("\tsize=\"45\"> <input type=\"submit\" value=\"提 交[U]\" accesskey=\"u\"></form>\r\n");
out.write("<p>具体格式请下载样本文档。 <a href=\"../BacthAddExaminee.xls\">下载格式文档</a>\r\n");
out.write("</p>\r\n");
out.write("</div>\r\n");
out.write("</div>\r\n");
out.write("<hr>\r\n");
out.write("<div class=block block-user id=block-user-0>\r\n");
out.write("<h2><span class=w1><span class=w2>批量修改</span></span></h2>\r\n");
out.write("<div class=content>\r\n");
out.write("<form action=\"adminExaminee.jsp\"><input type=hidden name=oper\r\n");
out.write("\tvalue='bacthChange'> 地区:<select name=area>\r\n");
out.write("\t<option value=\"%\" selected>全部</option>\r\n");
out.write("\t");
st.execute("select distinct area from examinee");
rs = st.getResultSet();
while (rs.next()) {
out.write("<option value=\"" + rs.getString(1) + "\">" + rs.getString(1) + "</option>)");
}
out.write("\r\n");
out.write("</select> 部门:<select name=dept>\r\n");
out.write("\t<option value=\"%\" selected>全部</option>\r\n");
out.write("\t");
st.execute("select distinct dept from examinee");
rs = st.getResultSet();
while (rs.next()) {
out.write("<option value=\"" + rs.getString(1) + "\">" + rs.getString(1) + "</option>)");
}
out.write("\r\n");
out.write("</select> 职务:<select name=duty>\r\n");
out.write("\t<option value=\"%\" selected>全部</option>\r\n");
out.write("\t");
st.execute("select distinct duty from examinee");
rs = st.getResultSet();
while (rs.next()) {
out.write("<option value=\"" + rs.getString(1) + "\">" + rs.getString(1) + "</option>)");
}
out.write("\r\n");
out.write("</select> 试卷类型:<select name=papertypeid>\r\n");
out.write("\t");
st.execute("select id,papertypename from exampapertype");
rs = st.getResultSet();
while (rs.next()) {
out.write("<option value=\"" + rs.getString(1) + "\">" + rs.getString(2) + "</option>)");
}
out.write("\r\n");
out.write("</select> <input type=\"submit\" value=\"提 交[C]\"\r\n");
out.write("\taccesskey=\"c\"></form>\r\n");
out.write("</div>\r\n");
out.write("</div>\r\n");
out.write("<hr>\r\n");
out.write("<div class=block block-user id=block-user-0>\r\n");
out.write("<h2><span class=w1><span class=w2>批量删除</span></span></h2>\r\n");
out.write("<div class=content>\r\n");
out.write("<form action=\"adminExaminee.jsp\" id=BacthDel method=\"post\"\r\n");
out.write("\tonsubmit=\"return confirm('确定要全部删除指定的考生!')\"><input type=hidden\r\n");
out.write("\tname=oper value='bacthDel'> 地区:<select name=area>\r\n");
out.write("\t<br>\r\n");
out.write("\t>\r\n");
out.write("\t<option value=\"%\" selected>全部</option>\r\n");
out.write("\t");
st.execute("select distinct area from examinee");
rs = st.getResultSet();
while (rs.next()) {
out.write("<option value=\"" + rs.getString(1) + "\">" + rs.getString(1) + "</option>)");
}
out.write("\r\n");
out.write("</select> 部门:<select name=dept>\r\n");
out.write("\t<br>\r\n");
out.write("\t>\r\n");
out.write("\t<option value=\"%\" selected>全部</option>\r\n");
out.write("\t");
st.execute("select distinct dept from examinee");
rs = st.getResultSet();
while (rs.next()) {
out.write("<option value=\"" + rs.getString(1) + "\">" + rs.getString(1) + "</option>)");
}
out.write("\r\n");
out.write("</select> 职务:<select name=duty>\r\n");
out.write("\t<option value=\"%\" selected>全部</option>\r\n");
out.write("\t");
st.execute("select distinct duty from examinee");
rs = st.getResultSet();
while (rs.next()) {
out.write("<option value=\"" + rs.getString(1) + "\">" + rs.getString(1) + "</option>)");
}
out.write("\r\n");
out.write("</select> <input type=\"submit\" value=\"提 交[D]\"\r\n");
out.write("\taccesskey=\"d\"></form>\r\n");
out.write("</div>\r\n");
out.write("</div></div>\r\n");
out.write("</body>\r\n");
out.write("<script>\r\n");
out.write("function checkUpload() {\r\n");
out.write("\t var ext =BacthAddExaminee.file.value;\r\n");
out.write("\t ext = ext.substring(ext.length-4,ext.length);\r\n");
out.write("\t ext = ext.toLowerCase();\r\n");
out.write("\t if(ext != '.xls' || ext.length==null) {\r\n");
out.write("\t\t \talert(\"你选择的文件不是.xls文件\"); \r\n");
out.write("\t\t\treturn false;\r\n");
out.write("\t }else{\r\n");
out.write("\t\t \tshowWaiting();\r\n");
out.write("\t\t \treturn true;\r\n");
out.write("\t }\r\n");
out.write("}\r\n");
out.write("function checkForm() {\r\n");
out.write("\t if(document.getElementById(\"id\").value.length==0||document.getElementById(\"name\").value.length==0||document.getElementById(\"idcard\").value.length==0||document.getElementById(\"dept\").value.length==0||document.getElementById(\"duty\").value.length==0){\r\n");
out.write("\t\t alert(\"有项目未输入必要的内容!\");\r\n");
out.write("\t\t return false;\r\n");
out.write("\t } else{\r\n");
out.write("\t\t\t return true;\r\n");
out.write("\t }\r\n");
out.write("}\r\n");
out.write("</script>\r\n");
out.write("</html>\r\n");
st.close();
}
catch (Exception e)
{
e.printStackTrace();
out.write("<script>alert('添加失败,可能你要添加的ID已经存在!')</script>");
out.write("</html>\r\n");
}
}
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException
{
doPost(request, response);
}
}
# 1 楼答案
如果部署应用程序
意味着你的代码是单独的。类文件而不是。jar文件
然后你可以替换单个文件
问题在于，Java类加载器，特别是Tomcat类加载器，可能无法替换内存中已经存在的类
它不会被替换
所以，你必须重新启动Tomcat
# 2 楼答案
您将无法单独编译一个文件。该文件有许多依赖项（其导入和使用许多其他类）。你可以做的是把属于同一个项目的所有类文件作为
AdminExaminee类，然后： 1.使用所有类文件（在反编译它们之后）在eclipse中创建一个项目 2.修改所需的类文件（AdminExaminee3.编制项目 4.用新类文件替换旧类文件这可能不是最好的解决方案，但肯定会奏效。我过去也遇到过类似的问题，我使用了同样的技巧
# 3 楼答案
由于您没有依赖项[导入的文件]，因此可能无法在使用javac的外部编译该类。你必须创建一个新的项目，反编译所有的类，并添加为java文件，进行更改并给出一个构建。最好是部署整个战争，而不是对爆发的战争做出改变
# 4 楼答案
加上卡里巴萨的答案。 如果检查分解的war文件，WEB-INF文件夹中可能没有单独的类。您必须在WEB-INF中创建一个名为“classes”的文件夹。将所需的类文件放入正确的包结构（根据需要创建文件夹），然后重新启动tomcat