【发布时间】：2014-06-06 09:01:21
【问题描述】：
我制作了一个模拟器，其中通过文件读取器从文本文件中读取数据并将每一行插入数据库中作为记录。通过jsp页面中的select查询也成功查看了数据。现在我想根据严重程度用不同的颜色显示每一行。如果我在 mysql 表中菜单插入记录，那么没有问题。 bt 如果模拟器插入数据，那么该数据甚至不允许与字符串合并...请帮助我..
代码：
package file_mgt;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.sql.Timestamp;
import java.util.ArrayList;
import java.util.Date;
import java.util.Random;
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 File_mgt
*/
@WebServlet("/File_mgt")
public class File_mgt extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public File_mgt() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
response.setIntHeader("Refresh", 3);
PrintWriter out=response.getWriter();
String alarm_name="";
String alarm_severity="";
String alarm_desc="";
Date time;
BufferedReader br = null;
Random rand = new Random();
int Tlines=0;
int minimum=1;
int maximum=10;
String sCurrentLine = null;
String line1 = null;
int counter=0;
ArrayList<String> x = new ArrayList<String>();
Connection conn=null;
PreparedStatement pst=null;
try {
response.setIntHeader("Refresh", 7);
Class.forName("com.mysql.jdbc.Driver");
//open connection
conn= DriverManager.getConnection("jdbc:mysql://localhost/mydb","root","root");
out.println("successfully connected!!!! :");
out.println("hi");
//String fileName = "D:/workSpace/Filemgt/src/files/test.txt";
br = new BufferedReader(new FileReader("D:/workSpace/Filemgt/src/files/test.txt"));
//========== total numbers of lines in file
while (br.readLine() != null) {
Tlines++;
}
out.println("total number of lines:"+Tlines);
//================generate random number======
Random rn = new Random();
int range = maximum - minimum + 1;
int randomNum = rn.nextInt(range) + minimum;
out.println("random number:"+randomNum);
//=============
br = new BufferedReader(new FileReader("D:/workSpace/Filemgt/src/files/test.txt"));
//line1 = br.readLine();
//out.println(line1);
while ((line1 = br.readLine()) != null) {
//out.println(sCurrentLine);
counter++;
if(counter == randomNum){
//out.println(line1);
String[] splited = line1.split(",");
alarm_name=splited[0];
alarm_severity=splited[1];
alarm_desc=splited[2];
Insertion(conn,pst,alarm_name,alarm_severity,alarm_desc);
out.println("\n");
out.println(alarm_name);
out.println(alarm_severity);
out.println(alarm_desc);
}
}
} catch (IOException e) {
e.printStackTrace();
out.println(e);
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
out.println(e);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
out.println(e);
} finally {
if (pst != null) {
try {
pst.close();
} catch (SQLException e) { /* ignored */}
}
if (conn != null) {
try {
conn.close();
} catch (SQLException e) { /* ignored */}
}
}
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
}
public static void Insertion(Connection conn, PreparedStatement pst, String alarm_name , String alarm_severity, String alarm_desc) throws SQLException{
java.util.Date date = new Date();
Timestamp timestamp = new Timestamp(date.getTime());
//pst.setTimestamp(1, timestamp);
pst=conn.prepareStatement("insert into test_alams2(name, severrity, description,Time) values(?,?,?,?)");
pst.setString(1, alarm_name);
pst.setString(2, alarm_severity);
pst.setString(3, alarm_desc);
pst.setTimestamp(4, timestamp);
pst.executeUpdate();
System.out.println("inserted....");
}
}
上面是我的模拟器...通过哪些数据成功插入。
数据检索代码为：
st=conn.createStatement();
String sql="select * from alarms2";
rs=st.executeQuery(sql);
while(rs.next())
{
alarm_id=rs.getInt("id");
alarm_name=rs.getString("Alarm_name");
alarm_severity=rs.getString("Alarm_severity");
alarm_desc=rs.getString("Alarm_desc");
time=rs.getString("Time");
out.println("<tr>");
%>
<td><a href="table_represent.jsp?id=<%= rs.getString("id") %>" ><%= alarm_id %></a></td>
<%
out.println("<td>"+alarm_name+"</td>");
out.println("<td>"+alarm_severity+"</td>");
out.println("<td>"+alarm_desc+"</td>");
out.println("<td>"+time+"</td>");
//out.println("<td>"+"its major"+"</td>");
out.println("</tr>");
// out.println(" <br> ");
//out.println("\n Severity:"+alarm_severity);
/*
if(alarm_severity.equalsIgnoreCase(Critical))
{
out.println(" <br> ");
out.println("<h1>"+"its true"+"</h1>");
}else {
out.println(" <br> ");
out.println(" => its not working");
}
*/
}
}
catch(Exception e){
out.println(e);
}
现在通过javascript想改变tr的背景颜色，代码是：
<script language="javascript">
var tbl = document.getElementById("tbl-1");
if (tbl != null) {
for (var i = 0; i < tbl.rows.length; i++) {
for (var j = 0; j < tbl.rows[i].cells.length; j++){
if(tbl.rows[i].cells[j].innerHTML == "major")
tbl.rows[i].style.backgroundColor = "#fff000";
else if(tbl.rows[i].cells[j].innerHTML == "minor")
tbl.rows[i].style.backgroundColor = "#000fff";
}
}
}else document.writeln("Sorry");
</script>
bt 比较有问题...我不能做任何由模拟器插入的记录。有什么解决办法？？？ 请帮助我。
【问题讨论】：
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标签： javascript mysql servlets