TOMCAT上显示:
type Exception reportmessage description The server encountered an internal error () that prevented it from fulfilling this request.exception org.apache.jasper.JasperException: /bookshoponline/chklogin.jsp(6,0) The value for the useBean class attribute connection.ConnPool is invalid.
org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:40)
org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:407)
org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:148)
org.apache.jasper.compiler.Generator$GenerateVisitor.visit(Generator.java:1200)
org.apache.jasper.compiler.Node$UseBean.accept(Node.java:1155)
org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2338)
org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2388)
org.apache.jasper.compiler.Node$Visitor.visit(Node.java:2394)
org.apache.jasper.compiler.Node$Root.accept(Node.java:489)
org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2338)
org.apache.jasper.compiler.Generator.generate(Generator.java:3374)
org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:210)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:306)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:286)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:273)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:566)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:317)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
note The full stack trace of the root cause is available in the Apache Tomcat/6.0.14 logs.这是说明什么?具体怎么解决?谢谢!(我刚来这网站,许多不懂,所以关于给分,我真的不好意思没多少分可给)
type Exception reportmessage description The server encountered an internal error () that prevented it from fulfilling this request.exception org.apache.jasper.JasperException: /bookshoponline/chklogin.jsp(6,0) The value for the useBean class attribute connection.ConnPool is invalid.
org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:40)
org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:407)
org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:148)
org.apache.jasper.compiler.Generator$GenerateVisitor.visit(Generator.java:1200)
org.apache.jasper.compiler.Node$UseBean.accept(Node.java:1155)
org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2338)
org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2388)
org.apache.jasper.compiler.Node$Visitor.visit(Node.java:2394)
org.apache.jasper.compiler.Node$Root.accept(Node.java:489)
org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2338)
org.apache.jasper.compiler.Generator.generate(Generator.java:3374)
org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:210)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:306)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:286)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:273)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:566)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:317)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
note The full stack trace of the root cause is available in the Apache Tomcat/6.0.14 logs.这是说明什么?具体怎么解决?谢谢!(我刚来这网站,许多不懂,所以关于给分,我真的不好意思没多少分可给)
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connection.ConnPool这个东西在useBean 里面是非法的。 chklogin.jsp的第6行
使用了无效的属性检查下connection.ConnPool
package connection;
import java.io.Serializable;
import java.sql.*;
import java.util.*;public class ConnPool implements java.io.Serializable{
private String driver = null; //数据库驱动程序对象
private String url = null; //数据源的位置
private int size = 0; //连接池的最大连接数目
private String username = ""; //数据源的用户名
private String password = ""; //数据源的密码
private DbConn dc=null;
private Vector pool = null; //连接池中的连接列表 public ConnPool(){}
//设置数据库驱动程序
public void setDriver(String driver){
if (driver!=null) this.driver=driver;
}
//获取数据库驱动程序
public String getDriver(){
return driver;
} //设置数据源的位置
public void setURL(String url){
if (url!=null) this.url=url;
}
//获取数据源的位置
public String getURL(){
return url;
}
//设置最大连接数
public void setSize(int size){
if (size>1) this.size=size;
}
//获取最大连接数
public int getSize(){
return size;
}
//设置数据源的用户名
public void setUsername(String username){
if (username!=null) this.username=username;
}
//获取数据源的用户名
public String getUserName(){
return username;
} //设置数据源的密码
public void setPassword(String password){
if (password!=null) this.password=password;
}
//获取数据源的密码
public String getPassword(){
return password;
} //设置用于单个连接任务的DbConn对象
public void setConnBean(DbConn dc){
if (dc!=null) this.dc=dc;
}
//获取用于单个连接任务的DbConn对象
public DbConn getConnBean() throws Exception{
Connection conn = getConnection();
DbConn dc = new DbConn(conn); //实例化DbConn类
dc.setInuse(true); //设置此连接可用
return dc;
} //创建到数据库的连接
private Connection createConnection() throws Exception{
Connection con = null;
con = DriverManager.getConnection(url,username,password);
return con;
}
//初始化连接池
public synchronized void initializePool() throws Exception{
if (driver==null) //如果没有加载驱动
throw new Exception("No Driver Provided!");
if (url==null) //如果没有设置数据源的位置
throw new Exception("No URL Proviced!");
if (size<1) //如果当前没有可用的连接
throw new Exception("Connection Pool Size is less than 1!");
try{
Class.forName(driver);
for (int i=0; i<size; i++){
//创建连接
Connection con = createConnection();
if (con!=null){
//将指定连接加入连接向量末尾
DbConn dc = new DbConn(con);
addConnection(dc);
}
}
}catch (Exception e){
System.err.println(e.getMessage());
throw new Exception(e.getMessage());
}
} //将指定连接加入连接向量末尾
private void addConnection(DbConn conn){
if (pool==null) pool=new Vector(size);
pool.addElement(conn);
} //释放指定连接的资源
public synchronized void releaseConnection(Connection con){
for (int i=0; i<pool.size(); i++){
DbConn connBean = (DbConn)pool.elementAt(i);
if (connBean.getConnection()==con){
//寻找到指定连接,将其置为未使用状态
connBean.setInuse(false);
break;
}
}
} //从连接池得到一个连接
public synchronized Connection getConnection() throws Exception{
DbConn dc = null;
for (int i=0; i<pool.size(); i++){
dc = (DbConn)pool.elementAt(i); // 从连接列表中获得所有连接
if (dc.getInuse()==false){
//如果还有未使用的连接,则使用这个连接
dc.setInuse(true);
Connection con = dc.getConnection();
return con;
}
}
//如果连接都已使用,则新建一连接
try{
Connection con = createConnection();
dc = new DbConn(con);
dc.setInuse(true);
pool.addElement(dc);
}catch (Exception e){
System.err.println(e.getMessage());
throw new Exception(e.getMessage());
}
return dc.getConnection();
} //清空连接池,释放资源
public synchronized void emptyPool(){
for (int i=0; i<pool.size(); i++){
DbConn connBean = (DbConn)pool.elementAt(i);
if (dc.getInuse()==false)
dc.close(); //释放连接资源
else{
try{
java.lang.Thread.sleep(20000);
dc.close();
}catch (InterruptedException ie){
System.err.println(ie.getMessage());
}
}
}
}
}