添加 public void addlbdio(lbdio lbdio)throws Exception {
PreparedStatement pstmt=con.prepareStatement("insert into newsLD values(?)"); pstmt.setString(1,new String(lbdio.getnewsLDM().getBytes("ISO-8859-1"),"gb2312")); pstmt.execute();
} 删除 public void deletelbdio(String newsLDID)throws Exception { Statement stmt=con.createStatement(); stmt.execute("delete from newsLD where newsLDID='"+newsLDID+"'"); } } 表 newsLD 整数型 自动编号 newsLDM 文本性 可不知为什么就是不行 返回值正常 修改正常 添加删除就是不正常 返回错误是HTTP Status 500 - --------------------------------------------------------------------------------type Exception reportmessage description The server encountered an internal error () that prevented it from fulfilling this request.exception org.apache.jasper.JasperException org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:358) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:301) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:248) javax.servlet.http.HttpServlet.service(HttpServlet.java:856) root cause java.lang.NullPointerException com.strong.fire.news.lbdcz.addlbdio(lbdcz.java:41) org.apache.jsp.addProduct_005fdo2_jsp._jspService(addProduct_005fdo2_jsp.java:77) org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:133) javax.servlet.http.HttpServlet.service(HttpServlet.java:856) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:311) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:301) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:248) javax.servlet.http.HttpServlet.service(HttpServlet.java:856) note The full stack trace of the root cause is available in the Tomcat logs. --------------------------------------------------------------------------------Apache Tomcat/5.0.19
问题:能不能推荐一下,JSP的经典教程.
一开始工作,如果不编程,是不是以后就很难再当程序员了(大多数情况).
回答问还给分豪爽!
我好爽!!!
public void addlbdio(lbdio lbdio)throws Exception
{
PreparedStatement pstmt=con.prepareStatement("insert into newsLD values(?)");
pstmt.setString(1,new String(lbdio.getnewsLDM().getBytes("ISO-8859-1"),"gb2312"));
pstmt.execute();
}
删除
public void deletelbdio(String newsLDID)throws Exception
{
Statement stmt=con.createStatement();
stmt.execute("delete from newsLD where newsLDID='"+newsLDID+"'");
}
}
表
newsLD 整数型 自动编号
newsLDM 文本性
可不知为什么就是不行
返回值正常
修改正常
添加删除就是不正常
返回错误是HTTP Status 500 - --------------------------------------------------------------------------------type Exception reportmessage description The server encountered an internal error () that prevented it from fulfilling this request.exception org.apache.jasper.JasperException
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:358)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:301)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:248)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
root cause java.lang.NullPointerException
com.strong.fire.news.lbdcz.addlbdio(lbdcz.java:41)
org.apache.jsp.addProduct_005fdo2_jsp._jspService(addProduct_005fdo2_jsp.java:77)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:133)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:311)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:301)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:248)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
note The full stack trace of the root cause is available in the Tomcat logs.
--------------------------------------------------------------------------------Apache Tomcat/5.0.19