读取配置文件的例子
package info;
import java.io.*;
import java.util.Properties;
public class Init {
private String superName=null;
private String superPassword=null;
private String driverName=null;
private String DBURL=null;
private String DBUser=null;
private String DBPassword=null;
private int pageView;
public Init(String webPath) {
Properties prop=new Properties();
if(!webPath.endsWith(System.getProperty("file.separator"))){
webPath+=System.getProperty("file.separator");
}
try{
File file=new File(webPath+"WEB-INF"+System.getProperty("file.separator")+"guestbook.properties");
if(file.exists()){
FileInputStream fileIn=new FileInputStream(file);
prop.load(fileIn);
superName=prop.getProperty("superName");
superPassword=prop.getProperty("superPassword");
driverName=prop.getProperty("driverName");
DBURL=prop.getProperty("DBURL");
DBUser=prop.getProperty("DBUser");
DBPassword=prop.getProperty("DBPassword");
pageView=Integer.parseInt(prop.getProperty("pageView"));
}
else{
throw new FileNotFoundException("属性文件未找到");
}
}
catch(IOException e){
throw new RuntimeException(e);
}
catch(NumberFormatException e){
throw new RuntimeException(e);
}
}
public String getSuperName(){
return superName;
}
public String getSuperPassword(){
return superPassword;
}
public String getDriverName(){
return driverName;
}
public String getDBURL(){
return DBURL;
}
public String getDBUser(){
return DBUser;
}
public String getDBPassword(){
return DBPassword;
}
public int getPageView(){
return pageView;
}
}
配置文件大概格式如下：
#管理员帐号
superName=langzi
#管理员密码
superPassword=wubin
#数据库驱动程序
driverName=com.microsoft.jdbc.sqlserver.SQLServerDriver
#URL("wb"为数据库名)
DBURL=jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=wb
#连接数据库用户名DBUser=sa
#连接数据库密码
DBPassword=wb5520105
#每页记录数
pageView=20
tips：
package info;
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import sun.misc.BASE64Decoder;
import javax.sql.DataSource;
import java.sql.*;
public class admin extends HttpServlet {
private static final String CONTENT_TYPE = "text/html; charset=GB2312";
private DataSource dataSource=null;
//Initialize global variables
public void init() throws ServletException {
Init init=new Init(getServletContext().getRealPath("/"));
dataSource=LinkDB.getDB();
if (dataSource==null) {
LinkDB.setDB(init.getDriverName(),init.getDBURL(),init.getDBUser(),init.getDBPassword());
dataSource=LinkDB.getDB();
}
}
//Process the HTTP Get request
public void doGet(HttpServletRequest request,
HttpServletResponse response) throws ServletException,
IOException
{
Init init=new Init(getServletContext().getRealPath("/"));
response.setContentType(CONTENT_TYPE);
//get authorization header
String authorization = request.getHeader("Authorization");
if (authorization == null)
{
challenge(response); //no authorization so challenge
}
else
{
//determine if client is using basic authentication
if (!authorization.toLowerCase().startsWith("basic"))
{
challenge(response); //not basic so challenge
}
//取经过base64编码后的帐号和密码，从字符串第六位开始取
String namePass = authorization.substring(6).trim();
//instantiate Base64 decoder
BASE64Decoder decode = new BASE64Decoder();
//decode username and password
namePass = new String(decode.decodeBuffer(namePass));
]
//get username and password from decoded authorization text
String username = namePass.substring(0, colon);
String password = namePass.substring(colon+1);
//validate username and password (case sensitive)
if (!username.equals(init.getSuperName()) ||!password.equals(init.getSuperPassword()))
{
challenge(response); //invalid credentials so challenge
}
else
{
//验证通过后就写入session
HttpSession mySession=request.getSession(true);
mySession.setAttribute("supername",username);
response.sendRedirect("admin.jsp");
}
}
}
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("GB2312");
response.setContentType(CONTENT_TYPE);
PrintWriter out=response.getWriter();
ReadDB readDB=new ReadDB();
Connection conn=null;
Statement stmt=null;
try{
conn=dataSource.getConnection();
stmt=conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_UPDATABLE);
if (request.getParameter("addc") != null) {
String sql="alter table info_table2 add class"+(readDB.getNum()-1)+" float";
stmt.executeUpdate(sql);
out.println("<script>alert('完成');document.location='admin.jsp';</script>");
return;
}
if(request.getParameter("delc")!=null){
if(request.getParameter("classname").equals(""))
out.println("<script>alert('请选择要删除的课程');document.location='admin.jsp';</script>");
else{
String sql="alter table info_table2 drop column "+request.getParameter("classname");
stmt.executeUpdate(sql);
out.println("<script>alert('完成');document.location='admin.jsp';</script>");
}
return;
}
String id=request.getParameter("id").replaceAll("'","''");
String s_name=request.getParameter("s_name").replaceAll("'","''");
String s_sex=request.getParameter("s_sex").replaceAll("'","''");
String s_birth=request.getParameter("s_birth").replaceAll("'","''");
String s_grade=request.getParameter("s_grade").replaceAll("'","''");
float[] classname=new float[readDB.getNum()-2];
for(int i=1;i<=readDB.getNum()-2;i++)
classname[i - 1] = Float.parseFloat(request.getParameter("class" + i));
if(id.equals("")||s_name.equals("")||s_sex.equals("")||s_birth.equals("")||s_grade.equals("")){
out.println("<script>alert('请将所有信息填写完整');document.location='javascript:history.go(-1);'</script>");
return;
}
if(id.getBytes().length>20||s_name.getBytes().length>50||s_sex.getBytes().length>10||s_birth.getBytes().length>50||s_grade.getBytes().length>50){
out.println("<script>alert('填写的信息太长了，请重新填写');document.location='javascript:history.go(-1);'</script>");
return;
}
try{
stmt.executeUpdate("insert into info_table1 values('" + id + "','" +
s_name + "','" + s_sex + "','" + s_birth + "','" +
s_grade + "','" + Head.getTime() + "')");
String sql = "insert into info_table2 values('" + id + "','" + s_name +
"'";
for (int i = 0; i < classname.length; i++) {
sql = sql + "," + classname[i];
}
sql += ")";
stmt.executeUpdate(sql);
}
catch(SQLException e){
out.println("<script>alert('写数据库时出错，可能学号有重复');document.location='admin.jsp';</script>");
return;
}
out.println("<script>alert('完成');document.location='admin.jsp';</script>");
}
catch(SQLException e){
out.println(e);
}
catch(NumberFormatException e){
out.println("<script>alert('成绩必须为实数');document.location='javascript:history.go(-1);'</script>");
}
finally{
try{
stmt.close();
conn.close();
LinkDB.shutdownDataSource(dataSource);
}
catch(SQLException e){
out.println(e);
}
}
}
//向浏览器响应401头
private void challenge(HttpServletResponse response)
{
response.setStatus(response.SC_UNAUTHORIZED);
response.setHeader("WWW-Authenticate", "Basic realm=\"Login\"");
}
}
