SmartUpload组件使用过程中遇到的错误

在根据《Java Web开发实战经典》尝试为上传文件自动命名是遇到如下错误：

HTTP Status 500 -

---

type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

org.apache.jasper.JasperException: javax.servlet.ServletException: org.lxh.smart.SmartUploadException: File can't be saved (1120).
	org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:541)
	org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:417)
	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)

root cause

javax.servlet.ServletException: org.lxh.smart.SmartUploadException: File can't be saved (1120).
	org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:850)
	org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:779)
	org.apache.jsp.smartupload_005fdemo02_jsp._jspService(smartupload_005fdemo02_jsp.java:116)
	org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
	org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:393)
	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)

root cause

org.lxh.smart.SmartUploadException: File can't be saved (1120).
	org.lxh.smart.File.saveAs(File.java:75)
	org.lxh.smart.File.saveAs(File.java:54)
	org.apache.jsp.smartupload_005fdemo02_jsp._jspService(smartupload_005fdemo02_jsp.java:88)
	org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
	org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:393)
	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.

---

Apache Tomcat/6.0.14

错误1：原书中函数getIPTimeRand()

public String getIPTimeRand() {
StringBuffer buf = new StringBuffer();
if(this.ip != null) {
String s[] = this.ip.split("\.");
for(int i = 0; i < s.length; i++) {
buf.append(this.addZero(s[i],3));
}
}

buf.append(this.getTimeStamp());
Random r = new Random();
for(int i = 0; i < 3; i++) {
buf.append(r.nextInt(10));
}
return buf.toString();
}

定义有误：可以修改为String s[] = this.ip.split("."); 但这样，保存的文件名不包含IP中的字段

错误2 ：smartupload_demo02.jsp中

<img src="../upload/<%=fileName%>">应改为

<img src="./upload/<%=fileName%>">

这样就可以在页面内看到上传的图片了。